From a7562dff68d92210e9bb774916e5fe9198724918 Mon Sep 17 00:00:00 2001
From: cthuang <chungting@cloudflare.com>
Date: Wed, 5 Aug 2020 11:49:53 +0100
Subject: [PATCH] TUN-3233: List tunnels support filtering by deleted, name,
 existed at and id

---
 cmd/cloudflared/access/carrier.go             |    2 +-
 cmd/cloudflared/access/cmd.go                 |    2 +-
 cmd/cloudflared/cliutil/errors.go             |    2 +-
 cmd/cloudflared/config/configuration.go       |    4 +-
 cmd/cloudflared/generic_service.go            |    2 +-
 cmd/cloudflared/linux_service.go              |    2 +-
 cmd/cloudflared/macos_service.go              |    2 +-
 cmd/cloudflared/main.go                       |    2 +-
 cmd/cloudflared/tunnel/cmd.go                 |    4 +-
 cmd/cloudflared/tunnel/configuration.go       |    4 +-
 cmd/cloudflared/tunnel/login.go               |    2 +-
 cmd/cloudflared/tunnel/server.go              |    2 +-
 cmd/cloudflared/tunnel/subcommands.go         |   79 +-
 cmd/cloudflared/updater/update.go             |    4 +-
 cmd/cloudflared/windows_service.go            |    2 +-
 dbconnect/cmd.go                              |    4 +-
 dbconnect/cmd_test.go                         |    2 +-
 go.mod                                        |    3 +-
 go.sum                                        |    9 +
 tlsconfig/certreloader.go                     |    2 +-
 tunneldns/tunnel.go                           |    2 +-
 tunnelstore/client.go                         |   48 +-
 tunnelstore/filter.go                         |   42 +
 .../cpuguy83/go-md2man/v2/LICENSE.md          |   21 +
 .../cpuguy83/go-md2man/v2/md2man/md2man.go    |   14 +
 .../cpuguy83/go-md2man/v2/md2man/roff.go      |  345 ++++
 .../russross/blackfriday/v2/.gitignore        |    8 +
 .../russross/blackfriday/v2/.travis.yml       |   17 +
 .../russross/blackfriday/v2/LICENSE.txt       |   29 +
 .../russross/blackfriday/v2/README.md         |  291 +++
 .../russross/blackfriday/v2/block.go          | 1590 +++++++++++++++++
 .../github.com/russross/blackfriday/v2/doc.go |   18 +
 .../github.com/russross/blackfriday/v2/esc.go |   34 +
 .../github.com/russross/blackfriday/v2/go.mod |    1 +
 .../russross/blackfriday/v2/html.go           |  949 ++++++++++
 .../russross/blackfriday/v2/inline.go         | 1228 +++++++++++++
 .../russross/blackfriday/v2/markdown.go       |  950 ++++++++++
 .../russross/blackfriday/v2/node.go           |  354 ++++
 .../russross/blackfriday/v2/smartypants.go    |  457 +++++
 .../sanitized_anchor_name/.travis.yml         |   16 +
 .../shurcooL/sanitized_anchor_name/LICENSE    |   21 +
 .../shurcooL/sanitized_anchor_name/README.md  |   36 +
 .../shurcooL/sanitized_anchor_name/go.mod     |    1 +
 .../shurcooL/sanitized_anchor_name/main.go    |   29 +
 .../urfave/cli/v2}/.flake8                    |    0
 vendor/github.com/urfave/cli/v2/.gitignore    |    7 +
 .../urfave/cli/v2/CODE_OF_CONDUCT.md          |   74 +
 .../urfave/cli/v2}/LICENSE                    |    0
 vendor/github.com/urfave/cli/v2/README.md     |   66 +
 .../urfave/cli/v2}/altsrc/flag.go             |   16 +-
 .../urfave/cli/v2/altsrc/flag_generated.go    |  275 +++
 .../cli/v2}/altsrc/input_source_context.go    |    2 +-
 .../cli/v2}/altsrc/json_source_context.go     |   49 +-
 .../urfave/cli/v2}/altsrc/map_input_source.go |   16 +-
 .../urfave/cli/v2}/altsrc/toml_file_loader.go |   15 +-
 .../urfave/cli/v2}/altsrc/yaml_file_loader.go |   11 +-
 .../urfave/cli/v2}/app.go                     |  240 ++-
 .../urfave/cli/v2}/args.go                    |    8 +-
 .../urfave/cli/v2}/category.go                |   20 +-
 .../urfave/cli/v2}/cli.go                     |    2 +-
 .../urfave/cli/v2}/command.go                 |  113 +-
 .../urfave/cli/v2}/context.go                 |  139 +-
 vendor/github.com/urfave/cli/v2/docs.go       |  148 ++
 .../urfave/cli/v2}/errors.go                  |   12 +-
 vendor/github.com/urfave/cli/v2/fish.go       |  192 ++
 vendor/github.com/urfave/cli/v2/flag.go       |  388 ++++
 vendor/github.com/urfave/cli/v2/flag_bool.go  |  106 ++
 .../github.com/urfave/cli/v2/flag_duration.go |  105 ++
 .../github.com/urfave/cli/v2/flag_float64.go  |  106 ++
 .../urfave/cli/v2/flag_float64_slice.go       |  163 ++
 .../github.com/urfave/cli/v2/flag_generic.go  |  108 ++
 vendor/github.com/urfave/cli/v2/flag_int.go   |  106 ++
 vendor/github.com/urfave/cli/v2/flag_int64.go |  105 ++
 .../urfave/cli/v2/flag_int64_slice.go         |  159 ++
 .../urfave/cli/v2/flag_int_slice.go           |  173 ++
 vendor/github.com/urfave/cli/v2/flag_path.go  |   95 +
 .../github.com/urfave/cli/v2/flag_string.go   |   95 +
 .../urfave/cli/v2/flag_string_slice.go        |  171 ++
 .../urfave/cli/v2/flag_timestamp.go           |  152 ++
 vendor/github.com/urfave/cli/v2/flag_uint.go  |  105 ++
 .../github.com/urfave/cli/v2/flag_uint64.go   |  105 ++
 .../urfave/cli/v2}/funcs.go                   |   20 +-
 vendor/github.com/urfave/cli/v2/go.mod        |    9 +
 vendor/github.com/urfave/cli/v2/go.sum        |   14 +
 vendor/github.com/urfave/cli/v2/help.go       |  368 ++++
 vendor/github.com/urfave/cli/v2/parse.go      |   94 +
 vendor/github.com/urfave/cli/v2/sort.go       |   29 +
 vendor/github.com/urfave/cli/v2/template.go   |  120 ++
 vendor/gopkg.in/urfave/cli.v2/.gitignore      |    2 -
 vendor/gopkg.in/urfave/cli.v2/.travis.yml     |   28 -
 vendor/gopkg.in/urfave/cli.v2/CHANGELOG.md    |  431 -----
 vendor/gopkg.in/urfave/cli.v2/GNUmakefile     |   37 -
 vendor/gopkg.in/urfave/cli.v2/README.md       | 1433 ---------------
 .../gopkg.in/urfave/cli.v2/altsrc/altsrc.go   |    3 -
 .../urfave/cli.v2/altsrc/flag_generated.go    |  373 ----
 vendor/gopkg.in/urfave/cli.v2/appveyor.yml    |   36 -
 vendor/gopkg.in/urfave/cli.v2/cli-v1-to-v2    |  479 -----
 vendor/gopkg.in/urfave/cli.v2/flag-types.json |   98 -
 vendor/gopkg.in/urfave/cli.v2/flag.go         | 1034 -----------
 .../gopkg.in/urfave/cli.v2/flag_generated.go  |  629 -------
 .../urfave/cli.v2/generate-flag-types         |  255 ---
 vendor/gopkg.in/urfave/cli.v2/help.go         |  382 ----
 vendor/gopkg.in/urfave/cli.v2/runtests        |  172 --
 vendor/modules.txt                            |   12 +-
 104 files changed, 10612 insertions(+), 5729 deletions(-)
 create mode 100644 tunnelstore/filter.go
 create mode 100644 vendor/github.com/cpuguy83/go-md2man/v2/LICENSE.md
 create mode 100644 vendor/github.com/cpuguy83/go-md2man/v2/md2man/md2man.go
 create mode 100644 vendor/github.com/cpuguy83/go-md2man/v2/md2man/roff.go
 create mode 100644 vendor/github.com/russross/blackfriday/v2/.gitignore
 create mode 100644 vendor/github.com/russross/blackfriday/v2/.travis.yml
 create mode 100644 vendor/github.com/russross/blackfriday/v2/LICENSE.txt
 create mode 100644 vendor/github.com/russross/blackfriday/v2/README.md
 create mode 100644 vendor/github.com/russross/blackfriday/v2/block.go
 create mode 100644 vendor/github.com/russross/blackfriday/v2/doc.go
 create mode 100644 vendor/github.com/russross/blackfriday/v2/esc.go
 create mode 100644 vendor/github.com/russross/blackfriday/v2/go.mod
 create mode 100644 vendor/github.com/russross/blackfriday/v2/html.go
 create mode 100644 vendor/github.com/russross/blackfriday/v2/inline.go
 create mode 100644 vendor/github.com/russross/blackfriday/v2/markdown.go
 create mode 100644 vendor/github.com/russross/blackfriday/v2/node.go
 create mode 100644 vendor/github.com/russross/blackfriday/v2/smartypants.go
 create mode 100644 vendor/github.com/shurcooL/sanitized_anchor_name/.travis.yml
 create mode 100644 vendor/github.com/shurcooL/sanitized_anchor_name/LICENSE
 create mode 100644 vendor/github.com/shurcooL/sanitized_anchor_name/README.md
 create mode 100644 vendor/github.com/shurcooL/sanitized_anchor_name/go.mod
 create mode 100644 vendor/github.com/shurcooL/sanitized_anchor_name/main.go
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/.flake8 (100%)
 create mode 100644 vendor/github.com/urfave/cli/v2/.gitignore
 create mode 100644 vendor/github.com/urfave/cli/v2/CODE_OF_CONDUCT.md
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/LICENSE (100%)
 create mode 100644 vendor/github.com/urfave/cli/v2/README.md
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/altsrc/flag.go (95%)
 create mode 100644 vendor/github.com/urfave/cli/v2/altsrc/flag_generated.go
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/altsrc/input_source_context.go (95%)
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/altsrc/json_source_context.go (82%)
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/altsrc/map_input_source.go (97%)
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/altsrc/toml_file_loader.go (88%)
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/altsrc/yaml_file_loader.go (89%)
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/app.go (62%)
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/args.go (91%)
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/category.go (84%)
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/cli.go (87%)
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/command.go (69%)
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/context.go (66%)
 create mode 100644 vendor/github.com/urfave/cli/v2/docs.go
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/errors.go (89%)
 create mode 100644 vendor/github.com/urfave/cli/v2/fish.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_bool.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_duration.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_float64.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_float64_slice.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_generic.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_int.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_int64.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_int64_slice.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_int_slice.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_path.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_string.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_string_slice.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_timestamp.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_uint.go
 create mode 100644 vendor/github.com/urfave/cli/v2/flag_uint64.go
 rename vendor/{gopkg.in/urfave/cli.v2 => github.com/urfave/cli/v2}/funcs.go (57%)
 create mode 100644 vendor/github.com/urfave/cli/v2/go.mod
 create mode 100644 vendor/github.com/urfave/cli/v2/go.sum
 create mode 100644 vendor/github.com/urfave/cli/v2/help.go
 create mode 100644 vendor/github.com/urfave/cli/v2/parse.go
 create mode 100644 vendor/github.com/urfave/cli/v2/sort.go
 create mode 100644 vendor/github.com/urfave/cli/v2/template.go
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/.gitignore
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/.travis.yml
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/CHANGELOG.md
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/GNUmakefile
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/README.md
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/altsrc/altsrc.go
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/altsrc/flag_generated.go
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/appveyor.yml
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/cli-v1-to-v2
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/flag-types.json
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/flag.go
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/flag_generated.go
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/generate-flag-types
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/help.go
 delete mode 100644 vendor/gopkg.in/urfave/cli.v2/runtests

diff --git a/cmd/cloudflared/access/carrier.go b/cmd/cloudflared/access/carrier.go
index d503b064..66a92c0a 100644
--- a/cmd/cloudflared/access/carrier.go
+++ b/cmd/cloudflared/access/carrier.go
@@ -12,7 +12,7 @@ import (
 	"github.com/cloudflare/cloudflared/logger"
 	"github.com/cloudflare/cloudflared/validation"
 	"github.com/pkg/errors"
-	cli "gopkg.in/urfave/cli.v2"
+	cli "github.com/urfave/cli/v2"
 )
 
 // StartForwarder starts a client side websocket forward
diff --git a/cmd/cloudflared/access/cmd.go b/cmd/cloudflared/access/cmd.go
index 02c8e820..cd161678 100644
--- a/cmd/cloudflared/access/cmd.go
+++ b/cmd/cloudflared/access/cmd.go
@@ -21,7 +21,7 @@ import (
 	"golang.org/x/net/idna"
 
 	"github.com/getsentry/raven-go"
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 )
 
 const (
diff --git a/cmd/cloudflared/cliutil/errors.go b/cmd/cloudflared/cliutil/errors.go
index afbb6fdb..71976156 100644
--- a/cmd/cloudflared/cliutil/errors.go
+++ b/cmd/cloudflared/cliutil/errors.go
@@ -6,7 +6,7 @@ import (
 
 	"github.com/cloudflare/cloudflared/logger"
 	"github.com/pkg/errors"
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 )
 
 type usageError string
diff --git a/cmd/cloudflared/config/configuration.go b/cmd/cloudflared/config/configuration.go
index 76c39fbf..9411313b 100644
--- a/cmd/cloudflared/config/configuration.go
+++ b/cmd/cloudflared/config/configuration.go
@@ -7,8 +7,8 @@ import (
 	"runtime"
 
 	homedir "github.com/mitchellh/go-homedir"
-	"gopkg.in/urfave/cli.v2"
-	"gopkg.in/urfave/cli.v2/altsrc"
+	"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v2/altsrc"
 	"gopkg.in/yaml.v2"
 
 	"github.com/cloudflare/cloudflared/validation"
diff --git a/cmd/cloudflared/generic_service.go b/cmd/cloudflared/generic_service.go
index abb24111..e0a258e5 100644
--- a/cmd/cloudflared/generic_service.go
+++ b/cmd/cloudflared/generic_service.go
@@ -5,7 +5,7 @@ package main
 import (
 	"os"
 
-	cli "gopkg.in/urfave/cli.v2"
+	cli "github.com/urfave/cli/v2"
 )
 
 func runApp(app *cli.App, shutdownC, graceShutdownC chan struct{}) {
diff --git a/cmd/cloudflared/linux_service.go b/cmd/cloudflared/linux_service.go
index c2b40351..fb343460 100644
--- a/cmd/cloudflared/linux_service.go
+++ b/cmd/cloudflared/linux_service.go
@@ -11,7 +11,7 @@ import (
 	"github.com/cloudflare/cloudflared/cmd/cloudflared/config"
 	"github.com/cloudflare/cloudflared/logger"
 	"github.com/pkg/errors"
-	cli "gopkg.in/urfave/cli.v2"
+	cli "github.com/urfave/cli/v2"
 )
 
 func runApp(app *cli.App, shutdownC, graceShutdownC chan struct{}) {
diff --git a/cmd/cloudflared/macos_service.go b/cmd/cloudflared/macos_service.go
index 6f16e739..43f65b20 100644
--- a/cmd/cloudflared/macos_service.go
+++ b/cmd/cloudflared/macos_service.go
@@ -6,7 +6,7 @@ import (
 	"fmt"
 	"os"
 
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 
 	"github.com/cloudflare/cloudflared/cmd/cloudflared/cliutil"
 	"github.com/cloudflare/cloudflared/logger"
diff --git a/cmd/cloudflared/main.go b/cmd/cloudflared/main.go
index d2350071..b86477ed 100644
--- a/cmd/cloudflared/main.go
+++ b/cmd/cloudflared/main.go
@@ -17,7 +17,7 @@ import (
 
 	raven "github.com/getsentry/raven-go"
 	homedir "github.com/mitchellh/go-homedir"
-	cli "gopkg.in/urfave/cli.v2"
+	cli "github.com/urfave/cli/v2"
 
 	"github.com/pkg/errors"
 )
diff --git a/cmd/cloudflared/tunnel/cmd.go b/cmd/cloudflared/tunnel/cmd.go
index dbb949b2..ec4178ec 100644
--- a/cmd/cloudflared/tunnel/cmd.go
+++ b/cmd/cloudflared/tunnel/cmd.go
@@ -42,8 +42,8 @@ import (
 	"github.com/google/uuid"
 	"github.com/mitchellh/go-homedir"
 	"github.com/pkg/errors"
-	"gopkg.in/urfave/cli.v2"
-	"gopkg.in/urfave/cli.v2/altsrc"
+	"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v2/altsrc"
 )
 
 const (
diff --git a/cmd/cloudflared/tunnel/configuration.go b/cmd/cloudflared/tunnel/configuration.go
index 86d06600..b672b6fd 100644
--- a/cmd/cloudflared/tunnel/configuration.go
+++ b/cmd/cloudflared/tunnel/configuration.go
@@ -23,8 +23,8 @@ import (
 	"github.com/google/uuid"
 	"github.com/mitchellh/go-homedir"
 	"github.com/pkg/errors"
+	"github.com/urfave/cli/v2"
 	"golang.org/x/crypto/ssh/terminal"
-	"gopkg.in/urfave/cli.v2"
 )
 
 var (
@@ -302,7 +302,7 @@ func prepareTunnelConfig(
 		NamedTunnel:        namedTunnel,
 		ReplaceExisting:    c.Bool("force"),
 		// turn off use of reconnect token and auth refresh when using named tunnels
-		UseReconnectToken:  compatibilityMode && c.Bool("use-reconnect-token"),
+		UseReconnectToken: compatibilityMode && c.Bool("use-reconnect-token"),
 	}, nil
 }
 
diff --git a/cmd/cloudflared/tunnel/login.go b/cmd/cloudflared/tunnel/login.go
index 199cd454..aa068b1d 100644
--- a/cmd/cloudflared/tunnel/login.go
+++ b/cmd/cloudflared/tunnel/login.go
@@ -12,7 +12,7 @@ import (
 	"github.com/cloudflare/cloudflared/logger"
 	homedir "github.com/mitchellh/go-homedir"
 	"github.com/pkg/errors"
-	cli "gopkg.in/urfave/cli.v2"
+	cli "github.com/urfave/cli/v2"
 )
 
 const (
diff --git a/cmd/cloudflared/tunnel/server.go b/cmd/cloudflared/tunnel/server.go
index bb6598e3..832f5a97 100644
--- a/cmd/cloudflared/tunnel/server.go
+++ b/cmd/cloudflared/tunnel/server.go
@@ -4,7 +4,7 @@ import (
 	"github.com/cloudflare/cloudflared/logger"
 	"github.com/cloudflare/cloudflared/tunneldns"
 
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 
 	"github.com/pkg/errors"
 )
diff --git a/cmd/cloudflared/tunnel/subcommands.go b/cmd/cloudflared/tunnel/subcommands.go
index d9756d11..ad6a03f7 100644
--- a/cmd/cloudflared/tunnel/subcommands.go
+++ b/cmd/cloudflared/tunnel/subcommands.go
@@ -15,7 +15,7 @@ import (
 	"github.com/google/uuid"
 	"github.com/mitchellh/go-homedir"
 	"github.com/pkg/errors"
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 	"gopkg.in/yaml.v2"
 
 	"github.com/cloudflare/cloudflared/certutil"
@@ -37,6 +37,22 @@ var (
 		Aliases: []string{"d"},
 		Usage:   "Include deleted tunnels in the list",
 	}
+	listNameFlag = &cli.StringFlag{
+		Name:    "name",
+		Aliases: []string{"n"},
+		Usage:   "List tunnels with the given name",
+	}
+	listExistedAtFlag = &cli.TimestampFlag{
+		Name:    "when",
+		Aliases: []string{"w"},
+		Usage:   fmt.Sprintf("List tunnels that are active at the given time, expect format in RFC3339 (%s)", time.Now().Format(tunnelstore.TimeLayout)),
+		Layout:  tunnelstore.TimeLayout,
+	}
+	listIDFlag = &cli.StringFlag{
+		Name:    "id",
+		Aliases: []string{"i"},
+		Usage:   "List tunnel by ID",
+	}
 	outputFormatFlag = &cli.StringFlag{
 		Name:    "output",
 		Aliases: []string{"o"},
@@ -102,7 +118,10 @@ func createTunnel(c *cli.Context) error {
 	if err != nil {
 		return err
 	}
-	client := newTunnelstoreClient(c, cert, logger)
+	client, err := newTunnelstoreClient(c, cert, logger)
+	if err != nil {
+		return err
+	}
 
 	tunnel, err := client.CreateTunnel(name, tunnelSecret)
 	if err != nil {
@@ -215,7 +234,7 @@ func buildListCommand() *cli.Command {
 		Usage:     "List existing tunnels",
 		ArgsUsage: " ",
 		Hidden:    hideSubcommands,
-		Flags:     []cli.Flag{outputFormatFlag, showDeletedFlag},
+		Flags:     []cli.Flag{outputFormatFlag, showDeletedFlag, listNameFlag, listExistedAtFlag, listIDFlag},
 	}
 }
 
@@ -229,22 +248,32 @@ func listTunnels(c *cli.Context) error {
 	if err != nil {
 		return err
 	}
-	client := newTunnelstoreClient(c, cert, logger)
-
-	allTunnels, err := client.ListTunnels()
+	client, err := newTunnelstoreClient(c, cert, logger)
 	if err != nil {
-		return errors.Wrap(err, "Error listing tunnels")
+		return err
 	}
 
-	var tunnels []tunnelstore.Tunnel
-	if c.Bool("show-deleted") {
-		tunnels = allTunnels
-	} else {
-		for _, tunnel := range allTunnels {
-			if tunnel.DeletedAt.IsZero() {
-				tunnels = append(tunnels, tunnel)
-			}
+	filter := tunnelstore.NewFilter()
+	if !c.Bool("show-deleted") {
+		filter.ShowDeleted()
+	}
+	if name := c.String("name"); name != "" {
+		filter.ByName(name)
+	}
+	if existedAt := c.Timestamp("time"); existedAt != nil {
+		filter.ByExistedAt(*existedAt)
+	}
+	if id := c.String("id"); id != "" {
+		tunnelID, err := uuid.Parse(id)
+		if err != nil {
+			return errors.Wrapf(err, "%s is not a valid tunnel ID", id)
 		}
+		filter.ByTunnelID(tunnelID)
+	}
+
+	tunnels, err := client.ListTunnels(filter)
+	if err != nil {
+		return errors.Wrap(err, "Error listing tunnels")
 	}
 
 	if outputFormat := c.String(outputFormatFlag.Name); outputFormat != "" {
@@ -336,7 +365,10 @@ func deleteTunnel(c *cli.Context) error {
 	if err != nil {
 		return err
 	}
-	client := newTunnelstoreClient(c, cert, logger)
+	client, err := newTunnelstoreClient(c, cert, logger)
+	if err != nil {
+		return err
+	}
 
 	forceFlagSet := c.Bool("force")
 
@@ -390,9 +422,8 @@ func renderOutput(format string, v interface{}) error {
 	}
 }
 
-func newTunnelstoreClient(c *cli.Context, cert *certutil.OriginCert, logger logger.Service) tunnelstore.Client {
-	client := tunnelstore.NewRESTClient(c.String("api-url"), cert.AccountID, cert.ZoneID, cert.ServiceKey, logger)
-	return client
+func newTunnelstoreClient(c *cli.Context, cert *certutil.OriginCert, logger logger.Service) (tunnelstore.Client, error) {
+	return tunnelstore.NewRESTClient(c.String("api-url"), cert.AccountID, cert.ZoneID, cert.ServiceKey, logger)
 }
 
 func getOriginCertFromContext(c *cli.Context, logger logger.Service) (cert *certutil.OriginCert, originCertPath string, err error) {
@@ -474,7 +505,10 @@ func cleanupConnections(c *cli.Context) error {
 	if err != nil {
 		return err
 	}
-	client := newTunnelstoreClient(c, cert, logger)
+	client, err := newTunnelstoreClient(c, cert, logger)
+	if err != nil {
+		return err
+	}
 
 	for i := 0; i < c.NArg(); i++ {
 		tunnelID, err := uuid.Parse(c.Args().Get(i))
@@ -542,7 +576,10 @@ func routeTunnel(c *cli.Context) error {
 		return err
 	}
 
-	client := newTunnelstoreClient(c, cert, logger)
+	client, err := newTunnelstoreClient(c, cert, logger)
+	if err != nil {
+		return err
+	}
 
 	if err := client.RouteTunnel(tunnelID, route); err != nil {
 		return errors.Wrap(err, "Failed to route tunnel")
diff --git a/cmd/cloudflared/updater/update.go b/cmd/cloudflared/updater/update.go
index 637fc345..ba602722 100644
--- a/cmd/cloudflared/updater/update.go
+++ b/cmd/cloudflared/updater/update.go
@@ -8,8 +8,8 @@ import (
 	"runtime"
 	"time"
 
+	"github.com/urfave/cli/v2"
 	"golang.org/x/crypto/ssh/terminal"
-	"gopkg.in/urfave/cli.v2"
 
 	"github.com/cloudflare/cloudflared/cmd/cloudflared/config"
 	"github.com/cloudflare/cloudflared/logger"
@@ -38,7 +38,7 @@ EKx0BZogHSor9Wy5VztdFaAaVbsJiCbO
 )
 
 // BinaryUpdated implements ExitCoder interface, the app will exit with status code 11
-// https://pkg.go.dev/gopkg.in/urfave/cli.v2?tab=doc#ExitCoder
+// https://pkg.go.dev/github.com/urfave/cli/v2?tab=doc#ExitCoder
 type statusSuccess struct {
 	newVersion string
 }
diff --git a/cmd/cloudflared/windows_service.go b/cmd/cloudflared/windows_service.go
index a78b4fdb..e8d19c12 100644
--- a/cmd/cloudflared/windows_service.go
+++ b/cmd/cloudflared/windows_service.go
@@ -14,7 +14,7 @@ import (
 
 	"github.com/cloudflare/cloudflared/logger"
 	"github.com/pkg/errors"
-	cli "gopkg.in/urfave/cli.v2"
+	cli "github.com/urfave/cli/v2"
 
 	"golang.org/x/sys/windows"
 	"golang.org/x/sys/windows/svc"
diff --git a/dbconnect/cmd.go b/dbconnect/cmd.go
index 7f55f1ee..6a633669 100644
--- a/dbconnect/cmd.go
+++ b/dbconnect/cmd.go
@@ -6,8 +6,8 @@ import (
 	"net"
 	"strconv"
 
-	"gopkg.in/urfave/cli.v2"
-	"gopkg.in/urfave/cli.v2/altsrc"
+	"github.com/urfave/cli/v2"
+	"github.com/urfave/cli/v2/altsrc"
 )
 
 // Cmd is the entrypoint command for dbconnect.
diff --git a/dbconnect/cmd_test.go b/dbconnect/cmd_test.go
index e8b415f0..254d8f02 100644
--- a/dbconnect/cmd_test.go
+++ b/dbconnect/cmd_test.go
@@ -5,7 +5,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 )
 
 func TestCmd(t *testing.T) {
diff --git a/go.mod b/go.mod
index f11e05ca..ce870dd5 100644
--- a/go.mod
+++ b/go.mod
@@ -56,6 +56,7 @@ require (
 	github.com/rifflock/lfshook v0.0.0-20180920164130-b9218ef580f5 // indirect
 	github.com/stretchr/testify v1.3.0
 	github.com/tinylib/msgp v1.1.0 // indirect
+	github.com/urfave/cli/v2 v2.2.0
 	github.com/xo/dburl v0.0.0-20191005012637-293c3298d6c0
 	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
 	golang.org/x/net v0.0.0-20200625001655-4c5254603344
@@ -67,7 +68,7 @@ require (
 	google.golang.org/grpc v1.24.0 // indirect
 	gopkg.in/coreos/go-oidc.v2 v2.1.0
 	gopkg.in/square/go-jose.v2 v2.4.0 // indirect
-	gopkg.in/urfave/cli.v2 v2.0.0-20180128181224-d604b6ffeee8
+	gopkg.in/urfave/cli.v2 v2.0.0-20180128181224-d604b6ffeee8 // indirect
 	gopkg.in/yaml.v2 v2.2.4
 	zombiezen.com/go/capnproto2 v2.18.0+incompatible
 )
diff --git a/go.sum b/go.sum
index 5908e2a3..4766782a 100644
--- a/go.sum
+++ b/go.sum
@@ -45,6 +45,8 @@ github.com/coreos/go-oidc v0.0.0-20171002155002-a93f71fdfe73 h1:7CNPV0LWRCa1FNmq
 github.com/coreos/go-oidc v0.0.0-20171002155002-a93f71fdfe73/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHoZ1nMCKZlZ9V6mm3/LKc=
 github.com/coreos/go-systemd v0.0.0-20190620071333-e64a0ec8b42a h1:W8b4lQ4tFF21aspRGoBuCNV6V2fFJBF+pm1J6OY8Lys=
 github.com/coreos/go-systemd v0.0.0-20190620071333-e64a0ec8b42a/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/daaku/go.zipexe v1.0.0/go.mod h1:z8IiR6TsVLEYKwXAoE/I+8ys/sDkgTzSL0CLnGVd57E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -177,6 +179,10 @@ github.com/prometheus/procfs v0.0.5 h1:3+auTFlqw+ZaQYJARz6ArODtkaIwtvBTx3N2NehQl
 github.com/prometheus/procfs v0.0.5/go.mod h1:4A/X28fw3Fc593LaREMrKMqOKvUAntwMDaekg4FpcdQ=
 github.com/rifflock/lfshook v0.0.0-20180920164130-b9218ef580f5 h1:mZHayPoR0lNmnHyvtYjDeq0zlVHn9K/ZXoy17ylucdo=
 github.com/rifflock/lfshook v0.0.0-20180920164130-b9218ef580f5/go.mod h1:GEXHk5HgEKCvEIIrSpFI3ozzG5xOKA2DVlEX/gGnewM=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/sirupsen/logrus v1.3.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
@@ -187,6 +193,9 @@ github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/tinylib/msgp v1.1.0 h1:9fQd+ICuRIu/ue4vxJZu6/LzxN0HwMds2nq/0cFvxHU=
 github.com/tinylib/msgp v1.1.0/go.mod h1:+d+yLhGm8mzTaHzB+wgMYrodPfmZrzkirds8fDWklFE=
+github.com/urfave/cli v1.22.4 h1:u7tSpNPPswAFymm8IehJhy4uJMlUuU/GmqSkvJ1InXA=
+github.com/urfave/cli/v2 v2.2.0 h1:JTTnM6wKzdA0Jqodd966MVj4vWbbquZykeX1sKbe2C4=
+github.com/urfave/cli/v2 v2.2.0/go.mod h1:SE9GqnLQmjVa0iPEY0f1w3ygNIYcIJ0OKPMoW2caLfQ=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
 github.com/valyala/fasttemplate v1.0.1/go.mod h1:UQGH1tvbgY+Nz5t2n7tXsz52dQxojPUpymEIMZ47gx8=
 github.com/weppos/publicsuffix-go v0.4.0/go.mod h1:z3LCPQ38eedDQSwmsSRW4Y7t2L8Ln16JPQ02lHAdn5k=
diff --git a/tlsconfig/certreloader.go b/tlsconfig/certreloader.go
index a8fb7499..5830a4a4 100644
--- a/tlsconfig/certreloader.go
+++ b/tlsconfig/certreloader.go
@@ -11,7 +11,7 @@ import (
 	"github.com/cloudflare/cloudflared/logger"
 	"github.com/getsentry/raven-go"
 	"github.com/pkg/errors"
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 )
 
 const (
diff --git a/tunneldns/tunnel.go b/tunneldns/tunnel.go
index 4a4faf45..e8311f31 100644
--- a/tunneldns/tunnel.go
+++ b/tunneldns/tunnel.go
@@ -17,7 +17,7 @@ import (
 	"github.com/coredns/coredns/plugin"
 	"github.com/coredns/coredns/plugin/cache"
 	"github.com/pkg/errors"
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 )
 
 // Listener is an adapter between CoreDNS server and Warp runnable
diff --git a/tunnelstore/client.go b/tunnelstore/client.go
index cf7053b1..e5d11681 100644
--- a/tunnelstore/client.go
+++ b/tunnelstore/client.go
@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/url"
+	"path"
 	"strings"
 	"time"
 
@@ -114,7 +116,7 @@ type Client interface {
 	CreateTunnel(name string, tunnelSecret []byte) (*Tunnel, error)
 	GetTunnel(tunnelID uuid.UUID) (*Tunnel, error)
 	DeleteTunnel(tunnelID uuid.UUID) error
-	ListTunnels() ([]Tunnel, error)
+	ListTunnels(filter *Filter) ([]Tunnel, error)
 	CleanupConnections(tunnelID uuid.UUID) error
 	RouteTunnel(tunnelID uuid.UUID, route Route) error
 }
@@ -127,20 +129,28 @@ type RESTClient struct {
 }
 
 type baseEndpoints struct {
-	accountLevel string
-	zoneLevel    string
+	accountLevel url.URL
+	zoneLevel    url.URL
 }
 
 var _ Client = (*RESTClient)(nil)
 
-func NewRESTClient(baseURL string, accountTag, zoneTag string, authToken string, logger logger.Service) *RESTClient {
+func NewRESTClient(baseURL string, accountTag, zoneTag string, authToken string, logger logger.Service) (*RESTClient, error) {
 	if strings.HasSuffix(baseURL, "/") {
 		baseURL = baseURL[:len(baseURL)-1]
 	}
+	accountLevelEndpoint, err := url.Parse(fmt.Sprintf("%s/accounts/%s/tunnels", baseURL, accountTag))
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to create account level endpoint")
+	}
+	zoneLevelEndpoint, err := url.Parse(fmt.Sprintf("%s/zones/%s/tunnels", baseURL, zoneTag))
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to create account level endpoint")
+	}
 	return &RESTClient{
 		baseEndpoints: &baseEndpoints{
-			accountLevel: fmt.Sprintf("%s/accounts/%s/tunnels", baseURL, accountTag),
-			zoneLevel:    fmt.Sprintf("%s/zones/%s/tunnels", baseURL, zoneTag),
+			accountLevel: *accountLevelEndpoint,
+			zoneLevel:    *zoneLevelEndpoint,
 		},
 		authToken: authToken,
 		client: http.Client{
@@ -151,7 +161,7 @@ func NewRESTClient(baseURL string, accountTag, zoneTag string, authToken string,
 			Timeout: defaultTimeout,
 		},
 		logger: logger,
-	}
+	}, nil
 }
 
 type newTunnel struct {
@@ -185,7 +195,8 @@ func (r *RESTClient) CreateTunnel(name string, tunnelSecret []byte) (*Tunnel, er
 }
 
 func (r *RESTClient) GetTunnel(tunnelID uuid.UUID) (*Tunnel, error) {
-	endpoint := fmt.Sprintf("%s/%v", r.baseEndpoints.accountLevel, tunnelID)
+	endpoint := r.baseEndpoints.accountLevel
+	endpoint.Path = path.Join(endpoint.Path, fmt.Sprintf("%v", tunnelID))
 	resp, err := r.sendRequest("GET", endpoint, nil)
 	if err != nil {
 		return nil, errors.Wrap(err, "REST request failed")
@@ -200,7 +211,8 @@ func (r *RESTClient) GetTunnel(tunnelID uuid.UUID) (*Tunnel, error) {
 }
 
 func (r *RESTClient) DeleteTunnel(tunnelID uuid.UUID) error {
-	endpoint := fmt.Sprintf("%s/%v", r.baseEndpoints.accountLevel, tunnelID)
+	endpoint := r.baseEndpoints.accountLevel
+	endpoint.Path = path.Join(endpoint.Path, fmt.Sprintf("%v", tunnelID))
 	resp, err := r.sendRequest("DELETE", endpoint, nil)
 	if err != nil {
 		return errors.Wrap(err, "REST request failed")
@@ -210,8 +222,10 @@ func (r *RESTClient) DeleteTunnel(tunnelID uuid.UUID) error {
 	return r.statusCodeToError("delete tunnel", resp)
 }
 
-func (r *RESTClient) ListTunnels() ([]Tunnel, error) {
-	resp, err := r.sendRequest("GET", r.baseEndpoints.accountLevel, nil)
+func (r *RESTClient) ListTunnels(filter *Filter) ([]Tunnel, error) {
+	endpoint := r.baseEndpoints.accountLevel
+	endpoint.RawQuery = filter.encode()
+	resp, err := r.sendRequest("GET", endpoint, nil)
 	if err != nil {
 		return nil, errors.Wrap(err, "REST request failed")
 	}
@@ -229,7 +243,8 @@ func (r *RESTClient) ListTunnels() ([]Tunnel, error) {
 }
 
 func (r *RESTClient) CleanupConnections(tunnelID uuid.UUID) error {
-	endpoint := fmt.Sprintf("%s/%v/connections", r.baseEndpoints.accountLevel, tunnelID)
+	endpoint := r.baseEndpoints.accountLevel
+	endpoint.Path = path.Join(endpoint.Path, fmt.Sprintf("%v/connections", tunnelID))
 	resp, err := r.sendRequest("DELETE", endpoint, nil)
 	if err != nil {
 		return errors.Wrap(err, "REST request failed")
@@ -240,7 +255,8 @@ func (r *RESTClient) CleanupConnections(tunnelID uuid.UUID) error {
 }
 
 func (r *RESTClient) RouteTunnel(tunnelID uuid.UUID, route Route) error {
-	endpoint := fmt.Sprintf("%s/%v/routes", r.baseEndpoints.zoneLevel, tunnelID)
+	endpoint := r.baseEndpoints.zoneLevel
+	endpoint.Path = path.Join(endpoint.Path, fmt.Sprintf("%v/routes", tunnelID))
 	resp, err := r.sendRequest("PUT", endpoint, route)
 	if err != nil {
 		return errors.Wrap(err, "REST request failed")
@@ -250,9 +266,7 @@ func (r *RESTClient) RouteTunnel(tunnelID uuid.UUID, route Route) error {
 	return r.statusCodeToError("add route", resp)
 }
 
-func (r *RESTClient) sendRequest(method string, url string, body interface{}) (*http.Response, error) {
-	r.logger.Debugf("%s %s", method, url)
-
+func (r *RESTClient) sendRequest(method string, url url.URL, body interface{}) (*http.Response, error) {
 	var bodyReader io.Reader
 	if body != nil {
 		if bodyBytes, err := json.Marshal(body); err != nil {
@@ -262,7 +276,7 @@ func (r *RESTClient) sendRequest(method string, url string, body interface{}) (*
 		}
 	}
 
-	req, err := http.NewRequest(method, url, bodyReader)
+	req, err := http.NewRequest(method, url.String(), bodyReader)
 	if err != nil {
 		return nil, errors.Wrapf(err, "can't create %s request", method)
 	}
diff --git a/tunnelstore/filter.go b/tunnelstore/filter.go
new file mode 100644
index 00000000..1c24e63d
--- /dev/null
+++ b/tunnelstore/filter.go
@@ -0,0 +1,42 @@
+package tunnelstore
+
+import (
+	"net/url"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+const (
+	TimeLayout = time.RFC3339
+)
+
+type Filter struct {
+	queryParams url.Values
+}
+
+func NewFilter() *Filter {
+	return &Filter{
+		queryParams: url.Values{},
+	}
+}
+
+func (f *Filter) ByName(name string) {
+	f.queryParams.Set("name", name)
+}
+
+func (f *Filter) ShowDeleted() {
+	f.queryParams.Set("is_deleted", "false")
+}
+
+func (f *Filter) ByExistedAt(existedAt time.Time) {
+	f.queryParams.Set("existed_at", existedAt.Format(TimeLayout))
+}
+
+func (f *Filter) ByTunnelID(tunnelID uuid.UUID) {
+	f.queryParams.Set("uuid", tunnelID.String())
+}
+
+func (f Filter) encode() string {
+	return f.queryParams.Encode()
+}
diff --git a/vendor/github.com/cpuguy83/go-md2man/v2/LICENSE.md b/vendor/github.com/cpuguy83/go-md2man/v2/LICENSE.md
new file mode 100644
index 00000000..1cade6ce
--- /dev/null
+++ b/vendor/github.com/cpuguy83/go-md2man/v2/LICENSE.md
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Brian Goff
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/github.com/cpuguy83/go-md2man/v2/md2man/md2man.go b/vendor/github.com/cpuguy83/go-md2man/v2/md2man/md2man.go
new file mode 100644
index 00000000..b4800567
--- /dev/null
+++ b/vendor/github.com/cpuguy83/go-md2man/v2/md2man/md2man.go
@@ -0,0 +1,14 @@
+package md2man
+
+import (
+	"github.com/russross/blackfriday/v2"
+)
+
+// Render converts a markdown document into a roff formatted document.
+func Render(doc []byte) []byte {
+	renderer := NewRoffRenderer()
+
+	return blackfriday.Run(doc,
+		[]blackfriday.Option{blackfriday.WithRenderer(renderer),
+			blackfriday.WithExtensions(renderer.GetExtensions())}...)
+}
diff --git a/vendor/github.com/cpuguy83/go-md2man/v2/md2man/roff.go b/vendor/github.com/cpuguy83/go-md2man/v2/md2man/roff.go
new file mode 100644
index 00000000..0668a66c
--- /dev/null
+++ b/vendor/github.com/cpuguy83/go-md2man/v2/md2man/roff.go
@@ -0,0 +1,345 @@
+package md2man
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+
+	"github.com/russross/blackfriday/v2"
+)
+
+// roffRenderer implements the blackfriday.Renderer interface for creating
+// roff format (manpages) from markdown text
+type roffRenderer struct {
+	extensions   blackfriday.Extensions
+	listCounters []int
+	firstHeader  bool
+	defineTerm   bool
+	listDepth    int
+}
+
+const (
+	titleHeader      = ".TH "
+	topLevelHeader   = "\n\n.SH "
+	secondLevelHdr   = "\n.SH "
+	otherHeader      = "\n.SS "
+	crTag            = "\n"
+	emphTag          = "\\fI"
+	emphCloseTag     = "\\fP"
+	strongTag        = "\\fB"
+	strongCloseTag   = "\\fP"
+	breakTag         = "\n.br\n"
+	paraTag          = "\n.PP\n"
+	hruleTag         = "\n.ti 0\n\\l'\\n(.lu'\n"
+	linkTag          = "\n\\[la]"
+	linkCloseTag     = "\\[ra]"
+	codespanTag      = "\\fB\\fC"
+	codespanCloseTag = "\\fR"
+	codeTag          = "\n.PP\n.RS\n\n.nf\n"
+	codeCloseTag     = "\n.fi\n.RE\n"
+	quoteTag         = "\n.PP\n.RS\n"
+	quoteCloseTag    = "\n.RE\n"
+	listTag          = "\n.RS\n"
+	listCloseTag     = "\n.RE\n"
+	arglistTag       = "\n.TP\n"
+	tableStart       = "\n.TS\nallbox;\n"
+	tableEnd         = ".TE\n"
+	tableCellStart   = "T{\n"
+	tableCellEnd     = "\nT}\n"
+)
+
+// NewRoffRenderer creates a new blackfriday Renderer for generating roff documents
+// from markdown
+func NewRoffRenderer() *roffRenderer { // nolint: golint
+	var extensions blackfriday.Extensions
+
+	extensions |= blackfriday.NoIntraEmphasis
+	extensions |= blackfriday.Tables
+	extensions |= blackfriday.FencedCode
+	extensions |= blackfriday.SpaceHeadings
+	extensions |= blackfriday.Footnotes
+	extensions |= blackfriday.Titleblock
+	extensions |= blackfriday.DefinitionLists
+	return &roffRenderer{
+		extensions: extensions,
+	}
+}
+
+// GetExtensions returns the list of extensions used by this renderer implementation
+func (r *roffRenderer) GetExtensions() blackfriday.Extensions {
+	return r.extensions
+}
+
+// RenderHeader handles outputting the header at document start
+func (r *roffRenderer) RenderHeader(w io.Writer, ast *blackfriday.Node) {
+	// disable hyphenation
+	out(w, ".nh\n")
+}
+
+// RenderFooter handles outputting the footer at the document end; the roff
+// renderer has no footer information
+func (r *roffRenderer) RenderFooter(w io.Writer, ast *blackfriday.Node) {
+}
+
+// RenderNode is called for each node in a markdown document; based on the node
+// type the equivalent roff output is sent to the writer
+func (r *roffRenderer) RenderNode(w io.Writer, node *blackfriday.Node, entering bool) blackfriday.WalkStatus {
+
+	var walkAction = blackfriday.GoToNext
+
+	switch node.Type {
+	case blackfriday.Text:
+		r.handleText(w, node, entering)
+	case blackfriday.Softbreak:
+		out(w, crTag)
+	case blackfriday.Hardbreak:
+		out(w, breakTag)
+	case blackfriday.Emph:
+		if entering {
+			out(w, emphTag)
+		} else {
+			out(w, emphCloseTag)
+		}
+	case blackfriday.Strong:
+		if entering {
+			out(w, strongTag)
+		} else {
+			out(w, strongCloseTag)
+		}
+	case blackfriday.Link:
+		if !entering {
+			out(w, linkTag+string(node.LinkData.Destination)+linkCloseTag)
+		}
+	case blackfriday.Image:
+		// ignore images
+		walkAction = blackfriday.SkipChildren
+	case blackfriday.Code:
+		out(w, codespanTag)
+		escapeSpecialChars(w, node.Literal)
+		out(w, codespanCloseTag)
+	case blackfriday.Document:
+		break
+	case blackfriday.Paragraph:
+		// roff .PP markers break lists
+		if r.listDepth > 0 {
+			return blackfriday.GoToNext
+		}
+		if entering {
+			out(w, paraTag)
+		} else {
+			out(w, crTag)
+		}
+	case blackfriday.BlockQuote:
+		if entering {
+			out(w, quoteTag)
+		} else {
+			out(w, quoteCloseTag)
+		}
+	case blackfriday.Heading:
+		r.handleHeading(w, node, entering)
+	case blackfriday.HorizontalRule:
+		out(w, hruleTag)
+	case blackfriday.List:
+		r.handleList(w, node, entering)
+	case blackfriday.Item:
+		r.handleItem(w, node, entering)
+	case blackfriday.CodeBlock:
+		out(w, codeTag)
+		escapeSpecialChars(w, node.Literal)
+		out(w, codeCloseTag)
+	case blackfriday.Table:
+		r.handleTable(w, node, entering)
+	case blackfriday.TableCell:
+		r.handleTableCell(w, node, entering)
+	case blackfriday.TableHead:
+	case blackfriday.TableBody:
+	case blackfriday.TableRow:
+		// no action as cell entries do all the nroff formatting
+		return blackfriday.GoToNext
+	default:
+		fmt.Fprintln(os.Stderr, "WARNING: go-md2man does not handle node type "+node.Type.String())
+	}
+	return walkAction
+}
+
+func (r *roffRenderer) handleText(w io.Writer, node *blackfriday.Node, entering bool) {
+	var (
+		start, end string
+	)
+	// handle special roff table cell text encapsulation
+	if node.Parent.Type == blackfriday.TableCell {
+		if len(node.Literal) > 30 {
+			start = tableCellStart
+			end = tableCellEnd
+		} else {
+			// end rows that aren't terminated by "tableCellEnd" with a cr if end of row
+			if node.Parent.Next == nil && !node.Parent.IsHeader {
+				end = crTag
+			}
+		}
+	}
+	out(w, start)
+	escapeSpecialChars(w, node.Literal)
+	out(w, end)
+}
+
+func (r *roffRenderer) handleHeading(w io.Writer, node *blackfriday.Node, entering bool) {
+	if entering {
+		switch node.Level {
+		case 1:
+			if !r.firstHeader {
+				out(w, titleHeader)
+				r.firstHeader = true
+				break
+			}
+			out(w, topLevelHeader)
+		case 2:
+			out(w, secondLevelHdr)
+		default:
+			out(w, otherHeader)
+		}
+	}
+}
+
+func (r *roffRenderer) handleList(w io.Writer, node *blackfriday.Node, entering bool) {
+	openTag := listTag
+	closeTag := listCloseTag
+	if node.ListFlags&blackfriday.ListTypeDefinition != 0 {
+		// tags for definition lists handled within Item node
+		openTag = ""
+		closeTag = ""
+	}
+	if entering {
+		r.listDepth++
+		if node.ListFlags&blackfriday.ListTypeOrdered != 0 {
+			r.listCounters = append(r.listCounters, 1)
+		}
+		out(w, openTag)
+	} else {
+		if node.ListFlags&blackfriday.ListTypeOrdered != 0 {
+			r.listCounters = r.listCounters[:len(r.listCounters)-1]
+		}
+		out(w, closeTag)
+		r.listDepth--
+	}
+}
+
+func (r *roffRenderer) handleItem(w io.Writer, node *blackfriday.Node, entering bool) {
+	if entering {
+		if node.ListFlags&blackfriday.ListTypeOrdered != 0 {
+			out(w, fmt.Sprintf(".IP \"%3d.\" 5\n", r.listCounters[len(r.listCounters)-1]))
+			r.listCounters[len(r.listCounters)-1]++
+		} else if node.ListFlags&blackfriday.ListTypeDefinition != 0 {
+			// state machine for handling terms and following definitions
+			// since blackfriday does not distinguish them properly, nor
+			// does it seperate them into separate lists as it should
+			if !r.defineTerm {
+				out(w, arglistTag)
+				r.defineTerm = true
+			} else {
+				r.defineTerm = false
+			}
+		} else {
+			out(w, ".IP \\(bu 2\n")
+		}
+	} else {
+		out(w, "\n")
+	}
+}
+
+func (r *roffRenderer) handleTable(w io.Writer, node *blackfriday.Node, entering bool) {
+	if entering {
+		out(w, tableStart)
+		//call walker to count cells (and rows?) so format section can be produced
+		columns := countColumns(node)
+		out(w, strings.Repeat("l ", columns)+"\n")
+		out(w, strings.Repeat("l ", columns)+".\n")
+	} else {
+		out(w, tableEnd)
+	}
+}
+
+func (r *roffRenderer) handleTableCell(w io.Writer, node *blackfriday.Node, entering bool) {
+	var (
+		start, end string
+	)
+	if node.IsHeader {
+		start = codespanTag
+		end = codespanCloseTag
+	}
+	if entering {
+		if node.Prev != nil && node.Prev.Type == blackfriday.TableCell {
+			out(w, "\t"+start)
+		} else {
+			out(w, start)
+		}
+	} else {
+		// need to carriage return if we are at the end of the header row
+		if node.IsHeader && node.Next == nil {
+			end = end + crTag
+		}
+		out(w, end)
+	}
+}
+
+// because roff format requires knowing the column count before outputting any table
+// data we need to walk a table tree and count the columns
+func countColumns(node *blackfriday.Node) int {
+	var columns int
+
+	node.Walk(func(node *blackfriday.Node, entering bool) blackfriday.WalkStatus {
+		switch node.Type {
+		case blackfriday.TableRow:
+			if !entering {
+				return blackfriday.Terminate
+			}
+		case blackfriday.TableCell:
+			if entering {
+				columns++
+			}
+		default:
+		}
+		return blackfriday.GoToNext
+	})
+	return columns
+}
+
+func out(w io.Writer, output string) {
+	io.WriteString(w, output) // nolint: errcheck
+}
+
+func needsBackslash(c byte) bool {
+	for _, r := range []byte("-_&\\~") {
+		if c == r {
+			return true
+		}
+	}
+	return false
+}
+
+func escapeSpecialChars(w io.Writer, text []byte) {
+	for i := 0; i < len(text); i++ {
+		// escape initial apostrophe or period
+		if len(text) >= 1 && (text[0] == '\'' || text[0] == '.') {
+			out(w, "\\&")
+		}
+
+		// directly copy normal characters
+		org := i
+
+		for i < len(text) && !needsBackslash(text[i]) {
+			i++
+		}
+		if i > org {
+			w.Write(text[org:i]) // nolint: errcheck
+		}
+
+		// escape a character
+		if i >= len(text) {
+			break
+		}
+
+		w.Write([]byte{'\\', text[i]}) // nolint: errcheck
+	}
+}
diff --git a/vendor/github.com/russross/blackfriday/v2/.gitignore b/vendor/github.com/russross/blackfriday/v2/.gitignore
new file mode 100644
index 00000000..75623dcc
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/.gitignore
@@ -0,0 +1,8 @@
+*.out
+*.swp
+*.8
+*.6
+_obj
+_test*
+markdown
+tags
diff --git a/vendor/github.com/russross/blackfriday/v2/.travis.yml b/vendor/github.com/russross/blackfriday/v2/.travis.yml
new file mode 100644
index 00000000..b0b525a5
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/.travis.yml
@@ -0,0 +1,17 @@
+sudo: false
+language: go
+go:
+  - "1.10.x"
+  - "1.11.x"
+  - tip
+matrix:
+  fast_finish: true
+  allow_failures:
+    - go: tip
+install:
+  - # Do nothing. This is needed to prevent default install action "go get -t -v ./..." from happening here (we want it to happen inside script step).
+script:
+  - go get -t -v ./...
+  - diff -u <(echo -n) <(gofmt -d -s .)
+  - go tool vet .
+  - go test -v ./...
diff --git a/vendor/github.com/russross/blackfriday/v2/LICENSE.txt b/vendor/github.com/russross/blackfriday/v2/LICENSE.txt
new file mode 100644
index 00000000..2885af36
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/LICENSE.txt
@@ -0,0 +1,29 @@
+Blackfriday is distributed under the Simplified BSD License:
+
+> Copyright © 2011 Russ Ross
+> All rights reserved.
+>
+> Redistribution and use in source and binary forms, with or without
+> modification, are permitted provided that the following conditions
+> are met:
+>
+> 1.  Redistributions of source code must retain the above copyright
+>     notice, this list of conditions and the following disclaimer.
+>
+> 2.  Redistributions in binary form must reproduce the above
+>     copyright notice, this list of conditions and the following
+>     disclaimer in the documentation and/or other materials provided with
+>     the distribution.
+>
+> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+> "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+> LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+> FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+> COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+> INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+> BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+> LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+> CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+> LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+> ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+> POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/github.com/russross/blackfriday/v2/README.md b/vendor/github.com/russross/blackfriday/v2/README.md
new file mode 100644
index 00000000..d5a8649b
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/README.md
@@ -0,0 +1,291 @@
+Blackfriday [![Build Status](https://travis-ci.org/russross/blackfriday.svg?branch=master)](https://travis-ci.org/russross/blackfriday)
+===========
+
+Blackfriday is a [Markdown][1] processor implemented in [Go][2]. It
+is paranoid about its input (so you can safely feed it user-supplied
+data), it is fast, it supports common extensions (tables, smart
+punctuation substitutions, etc.), and it is safe for all utf-8
+(unicode) input.
+
+HTML output is currently supported, along with Smartypants
+extensions.
+
+It started as a translation from C of [Sundown][3].
+
+
+Installation
+------------
+
+Blackfriday is compatible with any modern Go release. With Go 1.7 and git
+installed:
+
+    go get gopkg.in/russross/blackfriday.v2
+
+will download, compile, and install the package into your `$GOPATH`
+directory hierarchy. Alternatively, you can achieve the same if you
+import it into a project:
+
+    import "gopkg.in/russross/blackfriday.v2"
+
+and `go get` without parameters.
+
+
+Versions
+--------
+
+Currently maintained and recommended version of Blackfriday is `v2`. It's being
+developed on its own branch: https://github.com/russross/blackfriday/tree/v2 and the
+documentation is available at
+https://godoc.org/gopkg.in/russross/blackfriday.v2.
+
+It is `go get`-able via via [gopkg.in][6] at `gopkg.in/russross/blackfriday.v2`,
+but we highly recommend using package management tool like [dep][7] or
+[Glide][8] and make use of semantic versioning. With package management you
+should import `github.com/russross/blackfriday` and specify that you're using
+version 2.0.0.
+
+Version 2 offers a number of improvements over v1:
+
+* Cleaned up API
+* A separate call to [`Parse`][4], which produces an abstract syntax tree for
+  the document
+* Latest bug fixes
+* Flexibility to easily add your own rendering extensions
+
+Potential drawbacks:
+
+* Our benchmarks show v2 to be slightly slower than v1. Currently in the
+  ballpark of around 15%.
+* API breakage. If you can't afford modifying your code to adhere to the new API
+  and don't care too much about the new features, v2 is probably not for you.
+* Several bug fixes are trailing behind and still need to be forward-ported to
+  v2. See issue [#348](https://github.com/russross/blackfriday/issues/348) for
+  tracking.
+
+Usage
+-----
+
+For the most sensible markdown processing, it is as simple as getting your input
+into a byte slice and calling:
+
+```go
+output := blackfriday.Run(input)
+```
+
+Your input will be parsed and the output rendered with a set of most popular
+extensions enabled. If you want the most basic feature set, corresponding with
+the bare Markdown specification, use:
+
+```go
+output := blackfriday.Run(input, blackfriday.WithNoExtensions())
+```
+
+### Sanitize untrusted content
+
+Blackfriday itself does nothing to protect against malicious content. If you are
+dealing with user-supplied markdown, we recommend running Blackfriday's output
+through HTML sanitizer such as [Bluemonday][5].
+
+Here's an example of simple usage of Blackfriday together with Bluemonday:
+
+```go
+import (
+    "github.com/microcosm-cc/bluemonday"
+    "github.com/russross/blackfriday"
+)
+
+// ...
+unsafe := blackfriday.Run(input)
+html := bluemonday.UGCPolicy().SanitizeBytes(unsafe)
+```
+
+### Custom options
+
+If you want to customize the set of options, use `blackfriday.WithExtensions`,
+`blackfriday.WithRenderer` and `blackfriday.WithRefOverride`.
+
+You can also check out `blackfriday-tool` for a more complete example
+of how to use it. Download and install it using:
+
+    go get github.com/russross/blackfriday-tool
+
+This is a simple command-line tool that allows you to process a
+markdown file using a standalone program.  You can also browse the
+source directly on github if you are just looking for some example
+code:
+
+* <http://github.com/russross/blackfriday-tool>
+
+Note that if you have not already done so, installing
+`blackfriday-tool` will be sufficient to download and install
+blackfriday in addition to the tool itself. The tool binary will be
+installed in `$GOPATH/bin`.  This is a statically-linked binary that
+can be copied to wherever you need it without worrying about
+dependencies and library versions.
+
+
+Features
+--------
+
+All features of Sundown are supported, including:
+
+*   **Compatibility**. The Markdown v1.0.3 test suite passes with
+    the `--tidy` option.  Without `--tidy`, the differences are
+    mostly in whitespace and entity escaping, where blackfriday is
+    more consistent and cleaner.
+
+*   **Common extensions**, including table support, fenced code
+    blocks, autolinks, strikethroughs, non-strict emphasis, etc.
+
+*   **Safety**. Blackfriday is paranoid when parsing, making it safe
+    to feed untrusted user input without fear of bad things
+    happening. The test suite stress tests this and there are no
+    known inputs that make it crash.  If you find one, please let me
+    know and send me the input that does it.
+
+    NOTE: "safety" in this context means *runtime safety only*. In order to
+    protect yourself against JavaScript injection in untrusted content, see
+    [this example](https://github.com/russross/blackfriday#sanitize-untrusted-content).
+
+*   **Fast processing**. It is fast enough to render on-demand in
+    most web applications without having to cache the output.
+
+*   **Thread safety**. You can run multiple parsers in different
+    goroutines without ill effect. There is no dependence on global
+    shared state.
+
+*   **Minimal dependencies**. Blackfriday only depends on standard
+    library packages in Go. The source code is pretty
+    self-contained, so it is easy to add to any project, including
+    Google App Engine projects.
+
+*   **Standards compliant**. Output successfully validates using the
+    W3C validation tool for HTML 4.01 and XHTML 1.0 Transitional.
+
+
+Extensions
+----------
+
+In addition to the standard markdown syntax, this package
+implements the following extensions:
+
+*   **Intra-word emphasis supression**. The `_` character is
+    commonly used inside words when discussing code, so having
+    markdown interpret it as an emphasis command is usually the
+    wrong thing. Blackfriday lets you treat all emphasis markers as
+    normal characters when they occur inside a word.
+
+*   **Tables**. Tables can be created by drawing them in the input
+    using a simple syntax:
+
+    ```
+    Name    | Age
+    --------|------
+    Bob     | 27
+    Alice   | 23
+    ```
+
+*   **Fenced code blocks**. In addition to the normal 4-space
+    indentation to mark code blocks, you can explicitly mark them
+    and supply a language (to make syntax highlighting simple). Just
+    mark it like this:
+
+        ```go
+        func getTrue() bool {
+            return true
+        }
+        ```
+
+    You can use 3 or more backticks to mark the beginning of the
+    block, and the same number to mark the end of the block.
+
+*   **Definition lists**. A simple definition list is made of a single-line
+    term followed by a colon and the definition for that term.
+
+        Cat
+        : Fluffy animal everyone likes
+
+        Internet
+        : Vector of transmission for pictures of cats
+
+    Terms must be separated from the previous definition by a blank line.
+
+*   **Footnotes**. A marker in the text that will become a superscript number;
+    a footnote definition that will be placed in a list of footnotes at the
+    end of the document. A footnote looks like this:
+
+        This is a footnote.[^1]
+
+        [^1]: the footnote text.
+
+*   **Autolinking**. Blackfriday can find URLs that have not been
+    explicitly marked as links and turn them into links.
+
+*   **Strikethrough**. Use two tildes (`~~`) to mark text that
+    should be crossed out.
+
+*   **Hard line breaks**. With this extension enabled newlines in the input
+    translate into line breaks in the output. This extension is off by default.
+
+*   **Smart quotes**. Smartypants-style punctuation substitution is
+    supported, turning normal double- and single-quote marks into
+    curly quotes, etc.
+
+*   **LaTeX-style dash parsing** is an additional option, where `--`
+    is translated into `&ndash;`, and `---` is translated into
+    `&mdash;`. This differs from most smartypants processors, which
+    turn a single hyphen into an ndash and a double hyphen into an
+    mdash.
+
+*   **Smart fractions**, where anything that looks like a fraction
+    is translated into suitable HTML (instead of just a few special
+    cases like most smartypant processors). For example, `4/5`
+    becomes `<sup>4</sup>&frasl;<sub>5</sub>`, which renders as
+    <sup>4</sup>&frasl;<sub>5</sub>.
+
+
+Other renderers
+---------------
+
+Blackfriday is structured to allow alternative rendering engines. Here
+are a few of note:
+
+*   [github_flavored_markdown](https://godoc.org/github.com/shurcooL/github_flavored_markdown):
+    provides a GitHub Flavored Markdown renderer with fenced code block
+    highlighting, clickable heading anchor links.
+
+    It's not customizable, and its goal is to produce HTML output
+    equivalent to the [GitHub Markdown API endpoint](https://developer.github.com/v3/markdown/#render-a-markdown-document-in-raw-mode),
+    except the rendering is performed locally.
+
+*   [markdownfmt](https://github.com/shurcooL/markdownfmt): like gofmt,
+    but for markdown.
+
+*   [LaTeX output](https://github.com/Ambrevar/Blackfriday-LaTeX):
+    renders output as LaTeX.
+
+*   [Blackfriday-Confluence](https://github.com/kentaro-m/blackfriday-confluence): provides a [Confluence Wiki Markup](https://confluence.atlassian.com/doc/confluence-wiki-markup-251003035.html) renderer.
+
+
+Todo
+----
+
+*   More unit testing
+*   Improve unicode support. It does not understand all unicode
+    rules (about what constitutes a letter, a punctuation symbol,
+    etc.), so it may fail to detect word boundaries correctly in
+    some instances. It is safe on all utf-8 input.
+
+
+License
+-------
+
+[Blackfriday is distributed under the Simplified BSD License](LICENSE.txt)
+
+
+   [1]: https://daringfireball.net/projects/markdown/ "Markdown"
+   [2]: https://golang.org/ "Go Language"
+   [3]: https://github.com/vmg/sundown "Sundown"
+   [4]: https://godoc.org/gopkg.in/russross/blackfriday.v2#Parse "Parse func"
+   [5]: https://github.com/microcosm-cc/bluemonday "Bluemonday"
+   [6]: https://labix.org/gopkg.in "gopkg.in"
diff --git a/vendor/github.com/russross/blackfriday/v2/block.go b/vendor/github.com/russross/blackfriday/v2/block.go
new file mode 100644
index 00000000..b8607474
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/block.go
@@ -0,0 +1,1590 @@
+//
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+//
+
+//
+// Functions to parse block-level elements.
+//
+
+package blackfriday
+
+import (
+	"bytes"
+	"html"
+	"regexp"
+	"strings"
+
+	"github.com/shurcooL/sanitized_anchor_name"
+)
+
+const (
+	charEntity = "&(?:#x[a-f0-9]{1,8}|#[0-9]{1,8}|[a-z][a-z0-9]{1,31});"
+	escapable  = "[!\"#$%&'()*+,./:;<=>?@[\\\\\\]^_`{|}~-]"
+)
+
+var (
+	reBackslashOrAmp      = regexp.MustCompile("[\\&]")
+	reEntityOrEscapedChar = regexp.MustCompile("(?i)\\\\" + escapable + "|" + charEntity)
+)
+
+// Parse block-level data.
+// Note: this function and many that it calls assume that
+// the input buffer ends with a newline.
+func (p *Markdown) block(data []byte) {
+	// this is called recursively: enforce a maximum depth
+	if p.nesting >= p.maxNesting {
+		return
+	}
+	p.nesting++
+
+	// parse out one block-level construct at a time
+	for len(data) > 0 {
+		// prefixed heading:
+		//
+		// # Heading 1
+		// ## Heading 2
+		// ...
+		// ###### Heading 6
+		if p.isPrefixHeading(data) {
+			data = data[p.prefixHeading(data):]
+			continue
+		}
+
+		// block of preformatted HTML:
+		//
+		// <div>
+		//     ...
+		// </div>
+		if data[0] == '<' {
+			if i := p.html(data, true); i > 0 {
+				data = data[i:]
+				continue
+			}
+		}
+
+		// title block
+		//
+		// % stuff
+		// % more stuff
+		// % even more stuff
+		if p.extensions&Titleblock != 0 {
+			if data[0] == '%' {
+				if i := p.titleBlock(data, true); i > 0 {
+					data = data[i:]
+					continue
+				}
+			}
+		}
+
+		// blank lines.  note: returns the # of bytes to skip
+		if i := p.isEmpty(data); i > 0 {
+			data = data[i:]
+			continue
+		}
+
+		// indented code block:
+		//
+		//     func max(a, b int) int {
+		//         if a > b {
+		//             return a
+		//         }
+		//         return b
+		//      }
+		if p.codePrefix(data) > 0 {
+			data = data[p.code(data):]
+			continue
+		}
+
+		// fenced code block:
+		//
+		// ``` go
+		// func fact(n int) int {
+		//     if n <= 1 {
+		//         return n
+		//     }
+		//     return n * fact(n-1)
+		// }
+		// ```
+		if p.extensions&FencedCode != 0 {
+			if i := p.fencedCodeBlock(data, true); i > 0 {
+				data = data[i:]
+				continue
+			}
+		}
+
+		// horizontal rule:
+		//
+		// ------
+		// or
+		// ******
+		// or
+		// ______
+		if p.isHRule(data) {
+			p.addBlock(HorizontalRule, nil)
+			var i int
+			for i = 0; i < len(data) && data[i] != '\n'; i++ {
+			}
+			data = data[i:]
+			continue
+		}
+
+		// block quote:
+		//
+		// > A big quote I found somewhere
+		// > on the web
+		if p.quotePrefix(data) > 0 {
+			data = data[p.quote(data):]
+			continue
+		}
+
+		// table:
+		//
+		// Name  | Age | Phone
+		// ------|-----|---------
+		// Bob   | 31  | 555-1234
+		// Alice | 27  | 555-4321
+		if p.extensions&Tables != 0 {
+			if i := p.table(data); i > 0 {
+				data = data[i:]
+				continue
+			}
+		}
+
+		// an itemized/unordered list:
+		//
+		// * Item 1
+		// * Item 2
+		//
+		// also works with + or -
+		if p.uliPrefix(data) > 0 {
+			data = data[p.list(data, 0):]
+			continue
+		}
+
+		// a numbered/ordered list:
+		//
+		// 1. Item 1
+		// 2. Item 2
+		if p.oliPrefix(data) > 0 {
+			data = data[p.list(data, ListTypeOrdered):]
+			continue
+		}
+
+		// definition lists:
+		//
+		// Term 1
+		// :   Definition a
+		// :   Definition b
+		//
+		// Term 2
+		// :   Definition c
+		if p.extensions&DefinitionLists != 0 {
+			if p.dliPrefix(data) > 0 {
+				data = data[p.list(data, ListTypeDefinition):]
+				continue
+			}
+		}
+
+		// anything else must look like a normal paragraph
+		// note: this finds underlined headings, too
+		data = data[p.paragraph(data):]
+	}
+
+	p.nesting--
+}
+
+func (p *Markdown) addBlock(typ NodeType, content []byte) *Node {
+	p.closeUnmatchedBlocks()
+	container := p.addChild(typ, 0)
+	container.content = content
+	return container
+}
+
+func (p *Markdown) isPrefixHeading(data []byte) bool {
+	if data[0] != '#' {
+		return false
+	}
+
+	if p.extensions&SpaceHeadings != 0 {
+		level := 0
+		for level < 6 && level < len(data) && data[level] == '#' {
+			level++
+		}
+		if level == len(data) || data[level] != ' ' {
+			return false
+		}
+	}
+	return true
+}
+
+func (p *Markdown) prefixHeading(data []byte) int {
+	level := 0
+	for level < 6 && level < len(data) && data[level] == '#' {
+		level++
+	}
+	i := skipChar(data, level, ' ')
+	end := skipUntilChar(data, i, '\n')
+	skip := end
+	id := ""
+	if p.extensions&HeadingIDs != 0 {
+		j, k := 0, 0
+		// find start/end of heading id
+		for j = i; j < end-1 && (data[j] != '{' || data[j+1] != '#'); j++ {
+		}
+		for k = j + 1; k < end && data[k] != '}'; k++ {
+		}
+		// extract heading id iff found
+		if j < end && k < end {
+			id = string(data[j+2 : k])
+			end = j
+			skip = k + 1
+			for end > 0 && data[end-1] == ' ' {
+				end--
+			}
+		}
+	}
+	for end > 0 && data[end-1] == '#' {
+		if isBackslashEscaped(data, end-1) {
+			break
+		}
+		end--
+	}
+	for end > 0 && data[end-1] == ' ' {
+		end--
+	}
+	if end > i {
+		if id == "" && p.extensions&AutoHeadingIDs != 0 {
+			id = sanitized_anchor_name.Create(string(data[i:end]))
+		}
+		block := p.addBlock(Heading, data[i:end])
+		block.HeadingID = id
+		block.Level = level
+	}
+	return skip
+}
+
+func (p *Markdown) isUnderlinedHeading(data []byte) int {
+	// test of level 1 heading
+	if data[0] == '=' {
+		i := skipChar(data, 1, '=')
+		i = skipChar(data, i, ' ')
+		if i < len(data) && data[i] == '\n' {
+			return 1
+		}
+		return 0
+	}
+
+	// test of level 2 heading
+	if data[0] == '-' {
+		i := skipChar(data, 1, '-')
+		i = skipChar(data, i, ' ')
+		if i < len(data) && data[i] == '\n' {
+			return 2
+		}
+		return 0
+	}
+
+	return 0
+}
+
+func (p *Markdown) titleBlock(data []byte, doRender bool) int {
+	if data[0] != '%' {
+		return 0
+	}
+	splitData := bytes.Split(data, []byte("\n"))
+	var i int
+	for idx, b := range splitData {
+		if !bytes.HasPrefix(b, []byte("%")) {
+			i = idx // - 1
+			break
+		}
+	}
+
+	data = bytes.Join(splitData[0:i], []byte("\n"))
+	consumed := len(data)
+	data = bytes.TrimPrefix(data, []byte("% "))
+	data = bytes.Replace(data, []byte("\n% "), []byte("\n"), -1)
+	block := p.addBlock(Heading, data)
+	block.Level = 1
+	block.IsTitleblock = true
+
+	return consumed
+}
+
+func (p *Markdown) html(data []byte, doRender bool) int {
+	var i, j int
+
+	// identify the opening tag
+	if data[0] != '<' {
+		return 0
+	}
+	curtag, tagfound := p.htmlFindTag(data[1:])
+
+	// handle special cases
+	if !tagfound {
+		// check for an HTML comment
+		if size := p.htmlComment(data, doRender); size > 0 {
+			return size
+		}
+
+		// check for an <hr> tag
+		if size := p.htmlHr(data, doRender); size > 0 {
+			return size
+		}
+
+		// no special case recognized
+		return 0
+	}
+
+	// look for an unindented matching closing tag
+	// followed by a blank line
+	found := false
+	/*
+		closetag := []byte("\n</" + curtag + ">")
+		j = len(curtag) + 1
+		for !found {
+			// scan for a closing tag at the beginning of a line
+			if skip := bytes.Index(data[j:], closetag); skip >= 0 {
+				j += skip + len(closetag)
+			} else {
+				break
+			}
+
+			// see if it is the only thing on the line
+			if skip := p.isEmpty(data[j:]); skip > 0 {
+				// see if it is followed by a blank line/eof
+				j += skip
+				if j >= len(data) {
+					found = true
+					i = j
+				} else {
+					if skip := p.isEmpty(data[j:]); skip > 0 {
+						j += skip
+						found = true
+						i = j
+					}
+				}
+			}
+		}
+	*/
+
+	// if not found, try a second pass looking for indented match
+	// but not if tag is "ins" or "del" (following original Markdown.pl)
+	if !found && curtag != "ins" && curtag != "del" {
+		i = 1
+		for i < len(data) {
+			i++
+			for i < len(data) && !(data[i-1] == '<' && data[i] == '/') {
+				i++
+			}
+
+			if i+2+len(curtag) >= len(data) {
+				break
+			}
+
+			j = p.htmlFindEnd(curtag, data[i-1:])
+
+			if j > 0 {
+				i += j - 1
+				found = true
+				break
+			}
+		}
+	}
+
+	if !found {
+		return 0
+	}
+
+	// the end of the block has been found
+	if doRender {
+		// trim newlines
+		end := i
+		for end > 0 && data[end-1] == '\n' {
+			end--
+		}
+		finalizeHTMLBlock(p.addBlock(HTMLBlock, data[:end]))
+	}
+
+	return i
+}
+
+func finalizeHTMLBlock(block *Node) {
+	block.Literal = block.content
+	block.content = nil
+}
+
+// HTML comment, lax form
+func (p *Markdown) htmlComment(data []byte, doRender bool) int {
+	i := p.inlineHTMLComment(data)
+	// needs to end with a blank line
+	if j := p.isEmpty(data[i:]); j > 0 {
+		size := i + j
+		if doRender {
+			// trim trailing newlines
+			end := size
+			for end > 0 && data[end-1] == '\n' {
+				end--
+			}
+			block := p.addBlock(HTMLBlock, data[:end])
+			finalizeHTMLBlock(block)
+		}
+		return size
+	}
+	return 0
+}
+
+// HR, which is the only self-closing block tag considered
+func (p *Markdown) htmlHr(data []byte, doRender bool) int {
+	if len(data) < 4 {
+		return 0
+	}
+	if data[0] != '<' || (data[1] != 'h' && data[1] != 'H') || (data[2] != 'r' && data[2] != 'R') {
+		return 0
+	}
+	if data[3] != ' ' && data[3] != '/' && data[3] != '>' {
+		// not an <hr> tag after all; at least not a valid one
+		return 0
+	}
+	i := 3
+	for i < len(data) && data[i] != '>' && data[i] != '\n' {
+		i++
+	}
+	if i < len(data) && data[i] == '>' {
+		i++
+		if j := p.isEmpty(data[i:]); j > 0 {
+			size := i + j
+			if doRender {
+				// trim newlines
+				end := size
+				for end > 0 && data[end-1] == '\n' {
+					end--
+				}
+				finalizeHTMLBlock(p.addBlock(HTMLBlock, data[:end]))
+			}
+			return size
+		}
+	}
+	return 0
+}
+
+func (p *Markdown) htmlFindTag(data []byte) (string, bool) {
+	i := 0
+	for i < len(data) && isalnum(data[i]) {
+		i++
+	}
+	key := string(data[:i])
+	if _, ok := blockTags[key]; ok {
+		return key, true
+	}
+	return "", false
+}
+
+func (p *Markdown) htmlFindEnd(tag string, data []byte) int {
+	// assume data[0] == '<' && data[1] == '/' already tested
+	if tag == "hr" {
+		return 2
+	}
+	// check if tag is a match
+	closetag := []byte("</" + tag + ">")
+	if !bytes.HasPrefix(data, closetag) {
+		return 0
+	}
+	i := len(closetag)
+
+	// check that the rest of the line is blank
+	skip := 0
+	if skip = p.isEmpty(data[i:]); skip == 0 {
+		return 0
+	}
+	i += skip
+	skip = 0
+
+	if i >= len(data) {
+		return i
+	}
+
+	if p.extensions&LaxHTMLBlocks != 0 {
+		return i
+	}
+	if skip = p.isEmpty(data[i:]); skip == 0 {
+		// following line must be blank
+		return 0
+	}
+
+	return i + skip
+}
+
+func (*Markdown) isEmpty(data []byte) int {
+	// it is okay to call isEmpty on an empty buffer
+	if len(data) == 0 {
+		return 0
+	}
+
+	var i int
+	for i = 0; i < len(data) && data[i] != '\n'; i++ {
+		if data[i] != ' ' && data[i] != '\t' {
+			return 0
+		}
+	}
+	if i < len(data) && data[i] == '\n' {
+		i++
+	}
+	return i
+}
+
+func (*Markdown) isHRule(data []byte) bool {
+	i := 0
+
+	// skip up to three spaces
+	for i < 3 && data[i] == ' ' {
+		i++
+	}
+
+	// look at the hrule char
+	if data[i] != '*' && data[i] != '-' && data[i] != '_' {
+		return false
+	}
+	c := data[i]
+
+	// the whole line must be the char or whitespace
+	n := 0
+	for i < len(data) && data[i] != '\n' {
+		switch {
+		case data[i] == c:
+			n++
+		case data[i] != ' ':
+			return false
+		}
+		i++
+	}
+
+	return n >= 3
+}
+
+// isFenceLine checks if there's a fence line (e.g., ``` or ``` go) at the beginning of data,
+// and returns the end index if so, or 0 otherwise. It also returns the marker found.
+// If info is not nil, it gets set to the syntax specified in the fence line.
+func isFenceLine(data []byte, info *string, oldmarker string) (end int, marker string) {
+	i, size := 0, 0
+
+	// skip up to three spaces
+	for i < len(data) && i < 3 && data[i] == ' ' {
+		i++
+	}
+
+	// check for the marker characters: ~ or `
+	if i >= len(data) {
+		return 0, ""
+	}
+	if data[i] != '~' && data[i] != '`' {
+		return 0, ""
+	}
+
+	c := data[i]
+
+	// the whole line must be the same char or whitespace
+	for i < len(data) && data[i] == c {
+		size++
+		i++
+	}
+
+	// the marker char must occur at least 3 times
+	if size < 3 {
+		return 0, ""
+	}
+	marker = string(data[i-size : i])
+
+	// if this is the end marker, it must match the beginning marker
+	if oldmarker != "" && marker != oldmarker {
+		return 0, ""
+	}
+
+	// TODO(shurcooL): It's probably a good idea to simplify the 2 code paths here
+	// into one, always get the info string, and discard it if the caller doesn't care.
+	if info != nil {
+		infoLength := 0
+		i = skipChar(data, i, ' ')
+
+		if i >= len(data) {
+			if i == len(data) {
+				return i, marker
+			}
+			return 0, ""
+		}
+
+		infoStart := i
+
+		if data[i] == '{' {
+			i++
+			infoStart++
+
+			for i < len(data) && data[i] != '}' && data[i] != '\n' {
+				infoLength++
+				i++
+			}
+
+			if i >= len(data) || data[i] != '}' {
+				return 0, ""
+			}
+
+			// strip all whitespace at the beginning and the end
+			// of the {} block
+			for infoLength > 0 && isspace(data[infoStart]) {
+				infoStart++
+				infoLength--
+			}
+
+			for infoLength > 0 && isspace(data[infoStart+infoLength-1]) {
+				infoLength--
+			}
+			i++
+			i = skipChar(data, i, ' ')
+		} else {
+			for i < len(data) && !isverticalspace(data[i]) {
+				infoLength++
+				i++
+			}
+		}
+
+		*info = strings.TrimSpace(string(data[infoStart : infoStart+infoLength]))
+	}
+
+	if i == len(data) {
+		return i, marker
+	}
+	if i > len(data) || data[i] != '\n' {
+		return 0, ""
+	}
+	return i + 1, marker // Take newline into account.
+}
+
+// fencedCodeBlock returns the end index if data contains a fenced code block at the beginning,
+// or 0 otherwise. It writes to out if doRender is true, otherwise it has no side effects.
+// If doRender is true, a final newline is mandatory to recognize the fenced code block.
+func (p *Markdown) fencedCodeBlock(data []byte, doRender bool) int {
+	var info string
+	beg, marker := isFenceLine(data, &info, "")
+	if beg == 0 || beg >= len(data) {
+		return 0
+	}
+
+	var work bytes.Buffer
+	work.Write([]byte(info))
+	work.WriteByte('\n')
+
+	for {
+		// safe to assume beg < len(data)
+
+		// check for the end of the code block
+		fenceEnd, _ := isFenceLine(data[beg:], nil, marker)
+		if fenceEnd != 0 {
+			beg += fenceEnd
+			break
+		}
+
+		// copy the current line
+		end := skipUntilChar(data, beg, '\n') + 1
+
+		// did we reach the end of the buffer without a closing marker?
+		if end >= len(data) {
+			return 0
+		}
+
+		// verbatim copy to the working buffer
+		if doRender {
+			work.Write(data[beg:end])
+		}
+		beg = end
+	}
+
+	if doRender {
+		block := p.addBlock(CodeBlock, work.Bytes()) // TODO: get rid of temp buffer
+		block.IsFenced = true
+		finalizeCodeBlock(block)
+	}
+
+	return beg
+}
+
+func unescapeChar(str []byte) []byte {
+	if str[0] == '\\' {
+		return []byte{str[1]}
+	}
+	return []byte(html.UnescapeString(string(str)))
+}
+
+func unescapeString(str []byte) []byte {
+	if reBackslashOrAmp.Match(str) {
+		return reEntityOrEscapedChar.ReplaceAllFunc(str, unescapeChar)
+	}
+	return str
+}
+
+func finalizeCodeBlock(block *Node) {
+	if block.IsFenced {
+		newlinePos := bytes.IndexByte(block.content, '\n')
+		firstLine := block.content[:newlinePos]
+		rest := block.content[newlinePos+1:]
+		block.Info = unescapeString(bytes.Trim(firstLine, "\n"))
+		block.Literal = rest
+	} else {
+		block.Literal = block.content
+	}
+	block.content = nil
+}
+
+func (p *Markdown) table(data []byte) int {
+	table := p.addBlock(Table, nil)
+	i, columns := p.tableHeader(data)
+	if i == 0 {
+		p.tip = table.Parent
+		table.Unlink()
+		return 0
+	}
+
+	p.addBlock(TableBody, nil)
+
+	for i < len(data) {
+		pipes, rowStart := 0, i
+		for ; i < len(data) && data[i] != '\n'; i++ {
+			if data[i] == '|' {
+				pipes++
+			}
+		}
+
+		if pipes == 0 {
+			i = rowStart
+			break
+		}
+
+		// include the newline in data sent to tableRow
+		if i < len(data) && data[i] == '\n' {
+			i++
+		}
+		p.tableRow(data[rowStart:i], columns, false)
+	}
+
+	return i
+}
+
+// check if the specified position is preceded by an odd number of backslashes
+func isBackslashEscaped(data []byte, i int) bool {
+	backslashes := 0
+	for i-backslashes-1 >= 0 && data[i-backslashes-1] == '\\' {
+		backslashes++
+	}
+	return backslashes&1 == 1
+}
+
+func (p *Markdown) tableHeader(data []byte) (size int, columns []CellAlignFlags) {
+	i := 0
+	colCount := 1
+	for i = 0; i < len(data) && data[i] != '\n'; i++ {
+		if data[i] == '|' && !isBackslashEscaped(data, i) {
+			colCount++
+		}
+	}
+
+	// doesn't look like a table header
+	if colCount == 1 {
+		return
+	}
+
+	// include the newline in the data sent to tableRow
+	j := i
+	if j < len(data) && data[j] == '\n' {
+		j++
+	}
+	header := data[:j]
+
+	// column count ignores pipes at beginning or end of line
+	if data[0] == '|' {
+		colCount--
+	}
+	if i > 2 && data[i-1] == '|' && !isBackslashEscaped(data, i-1) {
+		colCount--
+	}
+
+	columns = make([]CellAlignFlags, colCount)
+
+	// move on to the header underline
+	i++
+	if i >= len(data) {
+		return
+	}
+
+	if data[i] == '|' && !isBackslashEscaped(data, i) {
+		i++
+	}
+	i = skipChar(data, i, ' ')
+
+	// each column header is of form: / *:?-+:? *|/ with # dashes + # colons >= 3
+	// and trailing | optional on last column
+	col := 0
+	for i < len(data) && data[i] != '\n' {
+		dashes := 0
+
+		if data[i] == ':' {
+			i++
+			columns[col] |= TableAlignmentLeft
+			dashes++
+		}
+		for i < len(data) && data[i] == '-' {
+			i++
+			dashes++
+		}
+		if i < len(data) && data[i] == ':' {
+			i++
+			columns[col] |= TableAlignmentRight
+			dashes++
+		}
+		for i < len(data) && data[i] == ' ' {
+			i++
+		}
+		if i == len(data) {
+			return
+		}
+		// end of column test is messy
+		switch {
+		case dashes < 3:
+			// not a valid column
+			return
+
+		case data[i] == '|' && !isBackslashEscaped(data, i):
+			// marker found, now skip past trailing whitespace
+			col++
+			i++
+			for i < len(data) && data[i] == ' ' {
+				i++
+			}
+
+			// trailing junk found after last column
+			if col >= colCount && i < len(data) && data[i] != '\n' {
+				return
+			}
+
+		case (data[i] != '|' || isBackslashEscaped(data, i)) && col+1 < colCount:
+			// something else found where marker was required
+			return
+
+		case data[i] == '\n':
+			// marker is optional for the last column
+			col++
+
+		default:
+			// trailing junk found after last column
+			return
+		}
+	}
+	if col != colCount {
+		return
+	}
+
+	p.addBlock(TableHead, nil)
+	p.tableRow(header, columns, true)
+	size = i
+	if size < len(data) && data[size] == '\n' {
+		size++
+	}
+	return
+}
+
+func (p *Markdown) tableRow(data []byte, columns []CellAlignFlags, header bool) {
+	p.addBlock(TableRow, nil)
+	i, col := 0, 0
+
+	if data[i] == '|' && !isBackslashEscaped(data, i) {
+		i++
+	}
+
+	for col = 0; col < len(columns) && i < len(data); col++ {
+		for i < len(data) && data[i] == ' ' {
+			i++
+		}
+
+		cellStart := i
+
+		for i < len(data) && (data[i] != '|' || isBackslashEscaped(data, i)) && data[i] != '\n' {
+			i++
+		}
+
+		cellEnd := i
+
+		// skip the end-of-cell marker, possibly taking us past end of buffer
+		i++
+
+		for cellEnd > cellStart && cellEnd-1 < len(data) && data[cellEnd-1] == ' ' {
+			cellEnd--
+		}
+
+		cell := p.addBlock(TableCell, data[cellStart:cellEnd])
+		cell.IsHeader = header
+		cell.Align = columns[col]
+	}
+
+	// pad it out with empty columns to get the right number
+	for ; col < len(columns); col++ {
+		cell := p.addBlock(TableCell, nil)
+		cell.IsHeader = header
+		cell.Align = columns[col]
+	}
+
+	// silently ignore rows with too many cells
+}
+
+// returns blockquote prefix length
+func (p *Markdown) quotePrefix(data []byte) int {
+	i := 0
+	for i < 3 && i < len(data) && data[i] == ' ' {
+		i++
+	}
+	if i < len(data) && data[i] == '>' {
+		if i+1 < len(data) && data[i+1] == ' ' {
+			return i + 2
+		}
+		return i + 1
+	}
+	return 0
+}
+
+// blockquote ends with at least one blank line
+// followed by something without a blockquote prefix
+func (p *Markdown) terminateBlockquote(data []byte, beg, end int) bool {
+	if p.isEmpty(data[beg:]) <= 0 {
+		return false
+	}
+	if end >= len(data) {
+		return true
+	}
+	return p.quotePrefix(data[end:]) == 0 && p.isEmpty(data[end:]) == 0
+}
+
+// parse a blockquote fragment
+func (p *Markdown) quote(data []byte) int {
+	block := p.addBlock(BlockQuote, nil)
+	var raw bytes.Buffer
+	beg, end := 0, 0
+	for beg < len(data) {
+		end = beg
+		// Step over whole lines, collecting them. While doing that, check for
+		// fenced code and if one's found, incorporate it altogether,
+		// irregardless of any contents inside it
+		for end < len(data) && data[end] != '\n' {
+			if p.extensions&FencedCode != 0 {
+				if i := p.fencedCodeBlock(data[end:], false); i > 0 {
+					// -1 to compensate for the extra end++ after the loop:
+					end += i - 1
+					break
+				}
+			}
+			end++
+		}
+		if end < len(data) && data[end] == '\n' {
+			end++
+		}
+		if pre := p.quotePrefix(data[beg:]); pre > 0 {
+			// skip the prefix
+			beg += pre
+		} else if p.terminateBlockquote(data, beg, end) {
+			break
+		}
+		// this line is part of the blockquote
+		raw.Write(data[beg:end])
+		beg = end
+	}
+	p.block(raw.Bytes())
+	p.finalize(block)
+	return end
+}
+
+// returns prefix length for block code
+func (p *Markdown) codePrefix(data []byte) int {
+	if len(data) >= 1 && data[0] == '\t' {
+		return 1
+	}
+	if len(data) >= 4 && data[0] == ' ' && data[1] == ' ' && data[2] == ' ' && data[3] == ' ' {
+		return 4
+	}
+	return 0
+}
+
+func (p *Markdown) code(data []byte) int {
+	var work bytes.Buffer
+
+	i := 0
+	for i < len(data) {
+		beg := i
+		for i < len(data) && data[i] != '\n' {
+			i++
+		}
+		if i < len(data) && data[i] == '\n' {
+			i++
+		}
+
+		blankline := p.isEmpty(data[beg:i]) > 0
+		if pre := p.codePrefix(data[beg:i]); pre > 0 {
+			beg += pre
+		} else if !blankline {
+			// non-empty, non-prefixed line breaks the pre
+			i = beg
+			break
+		}
+
+		// verbatim copy to the working buffer
+		if blankline {
+			work.WriteByte('\n')
+		} else {
+			work.Write(data[beg:i])
+		}
+	}
+
+	// trim all the \n off the end of work
+	workbytes := work.Bytes()
+	eol := len(workbytes)
+	for eol > 0 && workbytes[eol-1] == '\n' {
+		eol--
+	}
+	if eol != len(workbytes) {
+		work.Truncate(eol)
+	}
+
+	work.WriteByte('\n')
+
+	block := p.addBlock(CodeBlock, work.Bytes()) // TODO: get rid of temp buffer
+	block.IsFenced = false
+	finalizeCodeBlock(block)
+
+	return i
+}
+
+// returns unordered list item prefix
+func (p *Markdown) uliPrefix(data []byte) int {
+	i := 0
+	// start with up to 3 spaces
+	for i < len(data) && i < 3 && data[i] == ' ' {
+		i++
+	}
+	if i >= len(data)-1 {
+		return 0
+	}
+	// need one of {'*', '+', '-'} followed by a space or a tab
+	if (data[i] != '*' && data[i] != '+' && data[i] != '-') ||
+		(data[i+1] != ' ' && data[i+1] != '\t') {
+		return 0
+	}
+	return i + 2
+}
+
+// returns ordered list item prefix
+func (p *Markdown) oliPrefix(data []byte) int {
+	i := 0
+
+	// start with up to 3 spaces
+	for i < 3 && i < len(data) && data[i] == ' ' {
+		i++
+	}
+
+	// count the digits
+	start := i
+	for i < len(data) && data[i] >= '0' && data[i] <= '9' {
+		i++
+	}
+	if start == i || i >= len(data)-1 {
+		return 0
+	}
+
+	// we need >= 1 digits followed by a dot and a space or a tab
+	if data[i] != '.' || !(data[i+1] == ' ' || data[i+1] == '\t') {
+		return 0
+	}
+	return i + 2
+}
+
+// returns definition list item prefix
+func (p *Markdown) dliPrefix(data []byte) int {
+	if len(data) < 2 {
+		return 0
+	}
+	i := 0
+	// need a ':' followed by a space or a tab
+	if data[i] != ':' || !(data[i+1] == ' ' || data[i+1] == '\t') {
+		return 0
+	}
+	for i < len(data) && data[i] == ' ' {
+		i++
+	}
+	return i + 2
+}
+
+// parse ordered or unordered list block
+func (p *Markdown) list(data []byte, flags ListType) int {
+	i := 0
+	flags |= ListItemBeginningOfList
+	block := p.addBlock(List, nil)
+	block.ListFlags = flags
+	block.Tight = true
+
+	for i < len(data) {
+		skip := p.listItem(data[i:], &flags)
+		if flags&ListItemContainsBlock != 0 {
+			block.ListData.Tight = false
+		}
+		i += skip
+		if skip == 0 || flags&ListItemEndOfList != 0 {
+			break
+		}
+		flags &= ^ListItemBeginningOfList
+	}
+
+	above := block.Parent
+	finalizeList(block)
+	p.tip = above
+	return i
+}
+
+// Returns true if the list item is not the same type as its parent list
+func (p *Markdown) listTypeChanged(data []byte, flags *ListType) bool {
+	if p.dliPrefix(data) > 0 && *flags&ListTypeDefinition == 0 {
+		return true
+	} else if p.oliPrefix(data) > 0 && *flags&ListTypeOrdered == 0 {
+		return true
+	} else if p.uliPrefix(data) > 0 && (*flags&ListTypeOrdered != 0 || *flags&ListTypeDefinition != 0) {
+		return true
+	}
+	return false
+}
+
+// Returns true if block ends with a blank line, descending if needed
+// into lists and sublists.
+func endsWithBlankLine(block *Node) bool {
+	// TODO: figure this out. Always false now.
+	for block != nil {
+		//if block.lastLineBlank {
+		//return true
+		//}
+		t := block.Type
+		if t == List || t == Item {
+			block = block.LastChild
+		} else {
+			break
+		}
+	}
+	return false
+}
+
+func finalizeList(block *Node) {
+	block.open = false
+	item := block.FirstChild
+	for item != nil {
+		// check for non-final list item ending with blank line:
+		if endsWithBlankLine(item) && item.Next != nil {
+			block.ListData.Tight = false
+			break
+		}
+		// recurse into children of list item, to see if there are spaces
+		// between any of them:
+		subItem := item.FirstChild
+		for subItem != nil {
+			if endsWithBlankLine(subItem) && (item.Next != nil || subItem.Next != nil) {
+				block.ListData.Tight = false
+				break
+			}
+			subItem = subItem.Next
+		}
+		item = item.Next
+	}
+}
+
+// Parse a single list item.
+// Assumes initial prefix is already removed if this is a sublist.
+func (p *Markdown) listItem(data []byte, flags *ListType) int {
+	// keep track of the indentation of the first line
+	itemIndent := 0
+	if data[0] == '\t' {
+		itemIndent += 4
+	} else {
+		for itemIndent < 3 && data[itemIndent] == ' ' {
+			itemIndent++
+		}
+	}
+
+	var bulletChar byte = '*'
+	i := p.uliPrefix(data)
+	if i == 0 {
+		i = p.oliPrefix(data)
+	} else {
+		bulletChar = data[i-2]
+	}
+	if i == 0 {
+		i = p.dliPrefix(data)
+		// reset definition term flag
+		if i > 0 {
+			*flags &= ^ListTypeTerm
+		}
+	}
+	if i == 0 {
+		// if in definition list, set term flag and continue
+		if *flags&ListTypeDefinition != 0 {
+			*flags |= ListTypeTerm
+		} else {
+			return 0
+		}
+	}
+
+	// skip leading whitespace on first line
+	for i < len(data) && data[i] == ' ' {
+		i++
+	}
+
+	// find the end of the line
+	line := i
+	for i > 0 && i < len(data) && data[i-1] != '\n' {
+		i++
+	}
+
+	// get working buffer
+	var raw bytes.Buffer
+
+	// put the first line into the working buffer
+	raw.Write(data[line:i])
+	line = i
+
+	// process the following lines
+	containsBlankLine := false
+	sublist := 0
+	codeBlockMarker := ""
+
+gatherlines:
+	for line < len(data) {
+		i++
+
+		// find the end of this line
+		for i < len(data) && data[i-1] != '\n' {
+			i++
+		}
+
+		// if it is an empty line, guess that it is part of this item
+		// and move on to the next line
+		if p.isEmpty(data[line:i]) > 0 {
+			containsBlankLine = true
+			line = i
+			continue
+		}
+
+		// calculate the indentation
+		indent := 0
+		indentIndex := 0
+		if data[line] == '\t' {
+			indentIndex++
+			indent += 4
+		} else {
+			for indent < 4 && line+indent < i && data[line+indent] == ' ' {
+				indent++
+				indentIndex++
+			}
+		}
+
+		chunk := data[line+indentIndex : i]
+
+		if p.extensions&FencedCode != 0 {
+			// determine if in or out of codeblock
+			// if in codeblock, ignore normal list processing
+			_, marker := isFenceLine(chunk, nil, codeBlockMarker)
+			if marker != "" {
+				if codeBlockMarker == "" {
+					// start of codeblock
+					codeBlockMarker = marker
+				} else {
+					// end of codeblock.
+					codeBlockMarker = ""
+				}
+			}
+			// we are in a codeblock, write line, and continue
+			if codeBlockMarker != "" || marker != "" {
+				raw.Write(data[line+indentIndex : i])
+				line = i
+				continue gatherlines
+			}
+		}
+
+		// evaluate how this line fits in
+		switch {
+		// is this a nested list item?
+		case (p.uliPrefix(chunk) > 0 && !p.isHRule(chunk)) ||
+			p.oliPrefix(chunk) > 0 ||
+			p.dliPrefix(chunk) > 0:
+
+			// to be a nested list, it must be indented more
+			// if not, it is either a different kind of list
+			// or the next item in the same list
+			if indent <= itemIndent {
+				if p.listTypeChanged(chunk, flags) {
+					*flags |= ListItemEndOfList
+				} else if containsBlankLine {
+					*flags |= ListItemContainsBlock
+				}
+
+				break gatherlines
+			}
+
+			if containsBlankLine {
+				*flags |= ListItemContainsBlock
+			}
+
+			// is this the first item in the nested list?
+			if sublist == 0 {
+				sublist = raw.Len()
+			}
+
+		// is this a nested prefix heading?
+		case p.isPrefixHeading(chunk):
+			// if the heading is not indented, it is not nested in the list
+			// and thus ends the list
+			if containsBlankLine && indent < 4 {
+				*flags |= ListItemEndOfList
+				break gatherlines
+			}
+			*flags |= ListItemContainsBlock
+
+		// anything following an empty line is only part
+		// of this item if it is indented 4 spaces
+		// (regardless of the indentation of the beginning of the item)
+		case containsBlankLine && indent < 4:
+			if *flags&ListTypeDefinition != 0 && i < len(data)-1 {
+				// is the next item still a part of this list?
+				next := i
+				for next < len(data) && data[next] != '\n' {
+					next++
+				}
+				for next < len(data)-1 && data[next] == '\n' {
+					next++
+				}
+				if i < len(data)-1 && data[i] != ':' && data[next] != ':' {
+					*flags |= ListItemEndOfList
+				}
+			} else {
+				*flags |= ListItemEndOfList
+			}
+			break gatherlines
+
+		// a blank line means this should be parsed as a block
+		case containsBlankLine:
+			raw.WriteByte('\n')
+			*flags |= ListItemContainsBlock
+		}
+
+		// if this line was preceded by one or more blanks,
+		// re-introduce the blank into the buffer
+		if containsBlankLine {
+			containsBlankLine = false
+			raw.WriteByte('\n')
+		}
+
+		// add the line into the working buffer without prefix
+		raw.Write(data[line+indentIndex : i])
+
+		line = i
+	}
+
+	rawBytes := raw.Bytes()
+
+	block := p.addBlock(Item, nil)
+	block.ListFlags = *flags
+	block.Tight = false
+	block.BulletChar = bulletChar
+	block.Delimiter = '.' // Only '.' is possible in Markdown, but ')' will also be possible in CommonMark
+
+	// render the contents of the list item
+	if *flags&ListItemContainsBlock != 0 && *flags&ListTypeTerm == 0 {
+		// intermediate render of block item, except for definition term
+		if sublist > 0 {
+			p.block(rawBytes[:sublist])
+			p.block(rawBytes[sublist:])
+		} else {
+			p.block(rawBytes)
+		}
+	} else {
+		// intermediate render of inline item
+		if sublist > 0 {
+			child := p.addChild(Paragraph, 0)
+			child.content = rawBytes[:sublist]
+			p.block(rawBytes[sublist:])
+		} else {
+			child := p.addChild(Paragraph, 0)
+			child.content = rawBytes
+		}
+	}
+	return line
+}
+
+// render a single paragraph that has already been parsed out
+func (p *Markdown) renderParagraph(data []byte) {
+	if len(data) == 0 {
+		return
+	}
+
+	// trim leading spaces
+	beg := 0
+	for data[beg] == ' ' {
+		beg++
+	}
+
+	end := len(data)
+	// trim trailing newline
+	if data[len(data)-1] == '\n' {
+		end--
+	}
+
+	// trim trailing spaces
+	for end > beg && data[end-1] == ' ' {
+		end--
+	}
+
+	p.addBlock(Paragraph, data[beg:end])
+}
+
+func (p *Markdown) paragraph(data []byte) int {
+	// prev: index of 1st char of previous line
+	// line: index of 1st char of current line
+	// i: index of cursor/end of current line
+	var prev, line, i int
+	tabSize := TabSizeDefault
+	if p.extensions&TabSizeEight != 0 {
+		tabSize = TabSizeDouble
+	}
+	// keep going until we find something to mark the end of the paragraph
+	for i < len(data) {
+		// mark the beginning of the current line
+		prev = line
+		current := data[i:]
+		line = i
+
+		// did we find a reference or a footnote? If so, end a paragraph
+		// preceding it and report that we have consumed up to the end of that
+		// reference:
+		if refEnd := isReference(p, current, tabSize); refEnd > 0 {
+			p.renderParagraph(data[:i])
+			return i + refEnd
+		}
+
+		// did we find a blank line marking the end of the paragraph?
+		if n := p.isEmpty(current); n > 0 {
+			// did this blank line followed by a definition list item?
+			if p.extensions&DefinitionLists != 0 {
+				if i < len(data)-1 && data[i+1] == ':' {
+					return p.list(data[prev:], ListTypeDefinition)
+				}
+			}
+
+			p.renderParagraph(data[:i])
+			return i + n
+		}
+
+		// an underline under some text marks a heading, so our paragraph ended on prev line
+		if i > 0 {
+			if level := p.isUnderlinedHeading(current); level > 0 {
+				// render the paragraph
+				p.renderParagraph(data[:prev])
+
+				// ignore leading and trailing whitespace
+				eol := i - 1
+				for prev < eol && data[prev] == ' ' {
+					prev++
+				}
+				for eol > prev && data[eol-1] == ' ' {
+					eol--
+				}
+
+				id := ""
+				if p.extensions&AutoHeadingIDs != 0 {
+					id = sanitized_anchor_name.Create(string(data[prev:eol]))
+				}
+
+				block := p.addBlock(Heading, data[prev:eol])
+				block.Level = level
+				block.HeadingID = id
+
+				// find the end of the underline
+				for i < len(data) && data[i] != '\n' {
+					i++
+				}
+				return i
+			}
+		}
+
+		// if the next line starts a block of HTML, then the paragraph ends here
+		if p.extensions&LaxHTMLBlocks != 0 {
+			if data[i] == '<' && p.html(current, false) > 0 {
+				// rewind to before the HTML block
+				p.renderParagraph(data[:i])
+				return i
+			}
+		}
+
+		// if there's a prefixed heading or a horizontal rule after this, paragraph is over
+		if p.isPrefixHeading(current) || p.isHRule(current) {
+			p.renderParagraph(data[:i])
+			return i
+		}
+
+		// if there's a fenced code block, paragraph is over
+		if p.extensions&FencedCode != 0 {
+			if p.fencedCodeBlock(current, false) > 0 {
+				p.renderParagraph(data[:i])
+				return i
+			}
+		}
+
+		// if there's a definition list item, prev line is a definition term
+		if p.extensions&DefinitionLists != 0 {
+			if p.dliPrefix(current) != 0 {
+				ret := p.list(data[prev:], ListTypeDefinition)
+				return ret
+			}
+		}
+
+		// if there's a list after this, paragraph is over
+		if p.extensions&NoEmptyLineBeforeBlock != 0 {
+			if p.uliPrefix(current) != 0 ||
+				p.oliPrefix(current) != 0 ||
+				p.quotePrefix(current) != 0 ||
+				p.codePrefix(current) != 0 {
+				p.renderParagraph(data[:i])
+				return i
+			}
+		}
+
+		// otherwise, scan to the beginning of the next line
+		nl := bytes.IndexByte(data[i:], '\n')
+		if nl >= 0 {
+			i += nl + 1
+		} else {
+			i += len(data[i:])
+		}
+	}
+
+	p.renderParagraph(data[:i])
+	return i
+}
+
+func skipChar(data []byte, start int, char byte) int {
+	i := start
+	for i < len(data) && data[i] == char {
+		i++
+	}
+	return i
+}
+
+func skipUntilChar(text []byte, start int, char byte) int {
+	i := start
+	for i < len(text) && text[i] != char {
+		i++
+	}
+	return i
+}
diff --git a/vendor/github.com/russross/blackfriday/v2/doc.go b/vendor/github.com/russross/blackfriday/v2/doc.go
new file mode 100644
index 00000000..5b3fa987
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/doc.go
@@ -0,0 +1,18 @@
+// Package blackfriday is a markdown processor.
+//
+// It translates plain text with simple formatting rules into an AST, which can
+// then be further processed to HTML (provided by Blackfriday itself) or other
+// formats (provided by the community).
+//
+// The simplest way to invoke Blackfriday is to call the Run function. It will
+// take a text input and produce a text output in HTML (or other format).
+//
+// A slightly more sophisticated way to use Blackfriday is to create a Markdown
+// processor and to call Parse, which returns a syntax tree for the input
+// document. You can leverage Blackfriday's parsing for content extraction from
+// markdown documents. You can assign a custom renderer and set various options
+// to the Markdown processor.
+//
+// If you're interested in calling Blackfriday from command line, see
+// https://github.com/russross/blackfriday-tool.
+package blackfriday
diff --git a/vendor/github.com/russross/blackfriday/v2/esc.go b/vendor/github.com/russross/blackfriday/v2/esc.go
new file mode 100644
index 00000000..6385f27c
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/esc.go
@@ -0,0 +1,34 @@
+package blackfriday
+
+import (
+	"html"
+	"io"
+)
+
+var htmlEscaper = [256][]byte{
+	'&': []byte("&amp;"),
+	'<': []byte("&lt;"),
+	'>': []byte("&gt;"),
+	'"': []byte("&quot;"),
+}
+
+func escapeHTML(w io.Writer, s []byte) {
+	var start, end int
+	for end < len(s) {
+		escSeq := htmlEscaper[s[end]]
+		if escSeq != nil {
+			w.Write(s[start:end])
+			w.Write(escSeq)
+			start = end + 1
+		}
+		end++
+	}
+	if start < len(s) && end <= len(s) {
+		w.Write(s[start:end])
+	}
+}
+
+func escLink(w io.Writer, text []byte) {
+	unesc := html.UnescapeString(string(text))
+	escapeHTML(w, []byte(unesc))
+}
diff --git a/vendor/github.com/russross/blackfriday/v2/go.mod b/vendor/github.com/russross/blackfriday/v2/go.mod
new file mode 100644
index 00000000..620b74e0
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/go.mod
@@ -0,0 +1 @@
+module github.com/russross/blackfriday/v2
diff --git a/vendor/github.com/russross/blackfriday/v2/html.go b/vendor/github.com/russross/blackfriday/v2/html.go
new file mode 100644
index 00000000..284c8718
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/html.go
@@ -0,0 +1,949 @@
+//
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+//
+
+//
+//
+// HTML rendering backend
+//
+//
+
+package blackfriday
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"regexp"
+	"strings"
+)
+
+// HTMLFlags control optional behavior of HTML renderer.
+type HTMLFlags int
+
+// HTML renderer configuration options.
+const (
+	HTMLFlagsNone           HTMLFlags = 0
+	SkipHTML                HTMLFlags = 1 << iota // Skip preformatted HTML blocks
+	SkipImages                                    // Skip embedded images
+	SkipLinks                                     // Skip all links
+	Safelink                                      // Only link to trusted protocols
+	NofollowLinks                                 // Only link with rel="nofollow"
+	NoreferrerLinks                               // Only link with rel="noreferrer"
+	NoopenerLinks                                 // Only link with rel="noopener"
+	HrefTargetBlank                               // Add a blank target
+	CompletePage                                  // Generate a complete HTML page
+	UseXHTML                                      // Generate XHTML output instead of HTML
+	FootnoteReturnLinks                           // Generate a link at the end of a footnote to return to the source
+	Smartypants                                   // Enable smart punctuation substitutions
+	SmartypantsFractions                          // Enable smart fractions (with Smartypants)
+	SmartypantsDashes                             // Enable smart dashes (with Smartypants)
+	SmartypantsLatexDashes                        // Enable LaTeX-style dashes (with Smartypants)
+	SmartypantsAngledQuotes                       // Enable angled double quotes (with Smartypants) for double quotes rendering
+	SmartypantsQuotesNBSP                         // Enable « French guillemets » (with Smartypants)
+	TOC                                           // Generate a table of contents
+)
+
+var (
+	htmlTagRe = regexp.MustCompile("(?i)^" + htmlTag)
+)
+
+const (
+	htmlTag = "(?:" + openTag + "|" + closeTag + "|" + htmlComment + "|" +
+		processingInstruction + "|" + declaration + "|" + cdata + ")"
+	closeTag              = "</" + tagName + "\\s*[>]"
+	openTag               = "<" + tagName + attribute + "*" + "\\s*/?>"
+	attribute             = "(?:" + "\\s+" + attributeName + attributeValueSpec + "?)"
+	attributeValue        = "(?:" + unquotedValue + "|" + singleQuotedValue + "|" + doubleQuotedValue + ")"
+	attributeValueSpec    = "(?:" + "\\s*=" + "\\s*" + attributeValue + ")"
+	attributeName         = "[a-zA-Z_:][a-zA-Z0-9:._-]*"
+	cdata                 = "<!\\[CDATA\\[[\\s\\S]*?\\]\\]>"
+	declaration           = "<![A-Z]+" + "\\s+[^>]*>"
+	doubleQuotedValue     = "\"[^\"]*\""
+	htmlComment           = "<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->"
+	processingInstruction = "[<][?].*?[?][>]"
+	singleQuotedValue     = "'[^']*'"
+	tagName               = "[A-Za-z][A-Za-z0-9-]*"
+	unquotedValue         = "[^\"'=<>`\\x00-\\x20]+"
+)
+
+// HTMLRendererParameters is a collection of supplementary parameters tweaking
+// the behavior of various parts of HTML renderer.
+type HTMLRendererParameters struct {
+	// Prepend this text to each relative URL.
+	AbsolutePrefix string
+	// Add this text to each footnote anchor, to ensure uniqueness.
+	FootnoteAnchorPrefix string
+	// Show this text inside the <a> tag for a footnote return link, if the
+	// HTML_FOOTNOTE_RETURN_LINKS flag is enabled. If blank, the string
+	// <sup>[return]</sup> is used.
+	FootnoteReturnLinkContents string
+	// If set, add this text to the front of each Heading ID, to ensure
+	// uniqueness.
+	HeadingIDPrefix string
+	// If set, add this text to the back of each Heading ID, to ensure uniqueness.
+	HeadingIDSuffix string
+	// Increase heading levels: if the offset is 1, <h1> becomes <h2> etc.
+	// Negative offset is also valid.
+	// Resulting levels are clipped between 1 and 6.
+	HeadingLevelOffset int
+
+	Title string // Document title (used if CompletePage is set)
+	CSS   string // Optional CSS file URL (used if CompletePage is set)
+	Icon  string // Optional icon file URL (used if CompletePage is set)
+
+	Flags HTMLFlags // Flags allow customizing this renderer's behavior
+}
+
+// HTMLRenderer is a type that implements the Renderer interface for HTML output.
+//
+// Do not create this directly, instead use the NewHTMLRenderer function.
+type HTMLRenderer struct {
+	HTMLRendererParameters
+
+	closeTag string // how to end singleton tags: either " />" or ">"
+
+	// Track heading IDs to prevent ID collision in a single generation.
+	headingIDs map[string]int
+
+	lastOutputLen int
+	disableTags   int
+
+	sr *SPRenderer
+}
+
+const (
+	xhtmlClose = " />"
+	htmlClose  = ">"
+)
+
+// NewHTMLRenderer creates and configures an HTMLRenderer object, which
+// satisfies the Renderer interface.
+func NewHTMLRenderer(params HTMLRendererParameters) *HTMLRenderer {
+	// configure the rendering engine
+	closeTag := htmlClose
+	if params.Flags&UseXHTML != 0 {
+		closeTag = xhtmlClose
+	}
+
+	if params.FootnoteReturnLinkContents == "" {
+		params.FootnoteReturnLinkContents = `<sup>[return]</sup>`
+	}
+
+	return &HTMLRenderer{
+		HTMLRendererParameters: params,
+
+		closeTag:   closeTag,
+		headingIDs: make(map[string]int),
+
+		sr: NewSmartypantsRenderer(params.Flags),
+	}
+}
+
+func isHTMLTag(tag []byte, tagname string) bool {
+	found, _ := findHTMLTagPos(tag, tagname)
+	return found
+}
+
+// Look for a character, but ignore it when it's in any kind of quotes, it
+// might be JavaScript
+func skipUntilCharIgnoreQuotes(html []byte, start int, char byte) int {
+	inSingleQuote := false
+	inDoubleQuote := false
+	inGraveQuote := false
+	i := start
+	for i < len(html) {
+		switch {
+		case html[i] == char && !inSingleQuote && !inDoubleQuote && !inGraveQuote:
+			return i
+		case html[i] == '\'':
+			inSingleQuote = !inSingleQuote
+		case html[i] == '"':
+			inDoubleQuote = !inDoubleQuote
+		case html[i] == '`':
+			inGraveQuote = !inGraveQuote
+		}
+		i++
+	}
+	return start
+}
+
+func findHTMLTagPos(tag []byte, tagname string) (bool, int) {
+	i := 0
+	if i < len(tag) && tag[0] != '<' {
+		return false, -1
+	}
+	i++
+	i = skipSpace(tag, i)
+
+	if i < len(tag) && tag[i] == '/' {
+		i++
+	}
+
+	i = skipSpace(tag, i)
+	j := 0
+	for ; i < len(tag); i, j = i+1, j+1 {
+		if j >= len(tagname) {
+			break
+		}
+
+		if strings.ToLower(string(tag[i]))[0] != tagname[j] {
+			return false, -1
+		}
+	}
+
+	if i == len(tag) {
+		return false, -1
+	}
+
+	rightAngle := skipUntilCharIgnoreQuotes(tag, i, '>')
+	if rightAngle >= i {
+		return true, rightAngle
+	}
+
+	return false, -1
+}
+
+func skipSpace(tag []byte, i int) int {
+	for i < len(tag) && isspace(tag[i]) {
+		i++
+	}
+	return i
+}
+
+func isRelativeLink(link []byte) (yes bool) {
+	// a tag begin with '#'
+	if link[0] == '#' {
+		return true
+	}
+
+	// link begin with '/' but not '//', the second maybe a protocol relative link
+	if len(link) >= 2 && link[0] == '/' && link[1] != '/' {
+		return true
+	}
+
+	// only the root '/'
+	if len(link) == 1 && link[0] == '/' {
+		return true
+	}
+
+	// current directory : begin with "./"
+	if bytes.HasPrefix(link, []byte("./")) {
+		return true
+	}
+
+	// parent directory : begin with "../"
+	if bytes.HasPrefix(link, []byte("../")) {
+		return true
+	}
+
+	return false
+}
+
+func (r *HTMLRenderer) ensureUniqueHeadingID(id string) string {
+	for count, found := r.headingIDs[id]; found; count, found = r.headingIDs[id] {
+		tmp := fmt.Sprintf("%s-%d", id, count+1)
+
+		if _, tmpFound := r.headingIDs[tmp]; !tmpFound {
+			r.headingIDs[id] = count + 1
+			id = tmp
+		} else {
+			id = id + "-1"
+		}
+	}
+
+	if _, found := r.headingIDs[id]; !found {
+		r.headingIDs[id] = 0
+	}
+
+	return id
+}
+
+func (r *HTMLRenderer) addAbsPrefix(link []byte) []byte {
+	if r.AbsolutePrefix != "" && isRelativeLink(link) && link[0] != '.' {
+		newDest := r.AbsolutePrefix
+		if link[0] != '/' {
+			newDest += "/"
+		}
+		newDest += string(link)
+		return []byte(newDest)
+	}
+	return link
+}
+
+func appendLinkAttrs(attrs []string, flags HTMLFlags, link []byte) []string {
+	if isRelativeLink(link) {
+		return attrs
+	}
+	val := []string{}
+	if flags&NofollowLinks != 0 {
+		val = append(val, "nofollow")
+	}
+	if flags&NoreferrerLinks != 0 {
+		val = append(val, "noreferrer")
+	}
+	if flags&NoopenerLinks != 0 {
+		val = append(val, "noopener")
+	}
+	if flags&HrefTargetBlank != 0 {
+		attrs = append(attrs, "target=\"_blank\"")
+	}
+	if len(val) == 0 {
+		return attrs
+	}
+	attr := fmt.Sprintf("rel=%q", strings.Join(val, " "))
+	return append(attrs, attr)
+}
+
+func isMailto(link []byte) bool {
+	return bytes.HasPrefix(link, []byte("mailto:"))
+}
+
+func needSkipLink(flags HTMLFlags, dest []byte) bool {
+	if flags&SkipLinks != 0 {
+		return true
+	}
+	return flags&Safelink != 0 && !isSafeLink(dest) && !isMailto(dest)
+}
+
+func isSmartypantable(node *Node) bool {
+	pt := node.Parent.Type
+	return pt != Link && pt != CodeBlock && pt != Code
+}
+
+func appendLanguageAttr(attrs []string, info []byte) []string {
+	if len(info) == 0 {
+		return attrs
+	}
+	endOfLang := bytes.IndexAny(info, "\t ")
+	if endOfLang < 0 {
+		endOfLang = len(info)
+	}
+	return append(attrs, fmt.Sprintf("class=\"language-%s\"", info[:endOfLang]))
+}
+
+func (r *HTMLRenderer) tag(w io.Writer, name []byte, attrs []string) {
+	w.Write(name)
+	if len(attrs) > 0 {
+		w.Write(spaceBytes)
+		w.Write([]byte(strings.Join(attrs, " ")))
+	}
+	w.Write(gtBytes)
+	r.lastOutputLen = 1
+}
+
+func footnoteRef(prefix string, node *Node) []byte {
+	urlFrag := prefix + string(slugify(node.Destination))
+	anchor := fmt.Sprintf(`<a href="#fn:%s">%d</a>`, urlFrag, node.NoteID)
+	return []byte(fmt.Sprintf(`<sup class="footnote-ref" id="fnref:%s">%s</sup>`, urlFrag, anchor))
+}
+
+func footnoteItem(prefix string, slug []byte) []byte {
+	return []byte(fmt.Sprintf(`<li id="fn:%s%s">`, prefix, slug))
+}
+
+func footnoteReturnLink(prefix, returnLink string, slug []byte) []byte {
+	const format = ` <a class="footnote-return" href="#fnref:%s%s">%s</a>`
+	return []byte(fmt.Sprintf(format, prefix, slug, returnLink))
+}
+
+func itemOpenCR(node *Node) bool {
+	if node.Prev == nil {
+		return false
+	}
+	ld := node.Parent.ListData
+	return !ld.Tight && ld.ListFlags&ListTypeDefinition == 0
+}
+
+func skipParagraphTags(node *Node) bool {
+	grandparent := node.Parent.Parent
+	if grandparent == nil || grandparent.Type != List {
+		return false
+	}
+	tightOrTerm := grandparent.Tight || node.Parent.ListFlags&ListTypeTerm != 0
+	return grandparent.Type == List && tightOrTerm
+}
+
+func cellAlignment(align CellAlignFlags) string {
+	switch align {
+	case TableAlignmentLeft:
+		return "left"
+	case TableAlignmentRight:
+		return "right"
+	case TableAlignmentCenter:
+		return "center"
+	default:
+		return ""
+	}
+}
+
+func (r *HTMLRenderer) out(w io.Writer, text []byte) {
+	if r.disableTags > 0 {
+		w.Write(htmlTagRe.ReplaceAll(text, []byte{}))
+	} else {
+		w.Write(text)
+	}
+	r.lastOutputLen = len(text)
+}
+
+func (r *HTMLRenderer) cr(w io.Writer) {
+	if r.lastOutputLen > 0 {
+		r.out(w, nlBytes)
+	}
+}
+
+var (
+	nlBytes    = []byte{'\n'}
+	gtBytes    = []byte{'>'}
+	spaceBytes = []byte{' '}
+)
+
+var (
+	brTag              = []byte("<br>")
+	brXHTMLTag         = []byte("<br />")
+	emTag              = []byte("<em>")
+	emCloseTag         = []byte("</em>")
+	strongTag          = []byte("<strong>")
+	strongCloseTag     = []byte("</strong>")
+	delTag             = []byte("<del>")
+	delCloseTag        = []byte("</del>")
+	ttTag              = []byte("<tt>")
+	ttCloseTag         = []byte("</tt>")
+	aTag               = []byte("<a")
+	aCloseTag          = []byte("</a>")
+	preTag             = []byte("<pre>")
+	preCloseTag        = []byte("</pre>")
+	codeTag            = []byte("<code>")
+	codeCloseTag       = []byte("</code>")
+	pTag               = []byte("<p>")
+	pCloseTag          = []byte("</p>")
+	blockquoteTag      = []byte("<blockquote>")
+	blockquoteCloseTag = []byte("</blockquote>")
+	hrTag              = []byte("<hr>")
+	hrXHTMLTag         = []byte("<hr />")
+	ulTag              = []byte("<ul>")
+	ulCloseTag         = []byte("</ul>")
+	olTag              = []byte("<ol>")
+	olCloseTag         = []byte("</ol>")
+	dlTag              = []byte("<dl>")
+	dlCloseTag         = []byte("</dl>")
+	liTag              = []byte("<li>")
+	liCloseTag         = []byte("</li>")
+	ddTag              = []byte("<dd>")
+	ddCloseTag         = []byte("</dd>")
+	dtTag              = []byte("<dt>")
+	dtCloseTag         = []byte("</dt>")
+	tableTag           = []byte("<table>")
+	tableCloseTag      = []byte("</table>")
+	tdTag              = []byte("<td")
+	tdCloseTag         = []byte("</td>")
+	thTag              = []byte("<th")
+	thCloseTag         = []byte("</th>")
+	theadTag           = []byte("<thead>")
+	theadCloseTag      = []byte("</thead>")
+	tbodyTag           = []byte("<tbody>")
+	tbodyCloseTag      = []byte("</tbody>")
+	trTag              = []byte("<tr>")
+	trCloseTag         = []byte("</tr>")
+	h1Tag              = []byte("<h1")
+	h1CloseTag         = []byte("</h1>")
+	h2Tag              = []byte("<h2")
+	h2CloseTag         = []byte("</h2>")
+	h3Tag              = []byte("<h3")
+	h3CloseTag         = []byte("</h3>")
+	h4Tag              = []byte("<h4")
+	h4CloseTag         = []byte("</h4>")
+	h5Tag              = []byte("<h5")
+	h5CloseTag         = []byte("</h5>")
+	h6Tag              = []byte("<h6")
+	h6CloseTag         = []byte("</h6>")
+
+	footnotesDivBytes      = []byte("\n<div class=\"footnotes\">\n\n")
+	footnotesCloseDivBytes = []byte("\n</div>\n")
+)
+
+func headingTagsFromLevel(level int) ([]byte, []byte) {
+	if level <= 1 {
+		return h1Tag, h1CloseTag
+	}
+	switch level {
+	case 2:
+		return h2Tag, h2CloseTag
+	case 3:
+		return h3Tag, h3CloseTag
+	case 4:
+		return h4Tag, h4CloseTag
+	case 5:
+		return h5Tag, h5CloseTag
+	}
+	return h6Tag, h6CloseTag
+}
+
+func (r *HTMLRenderer) outHRTag(w io.Writer) {
+	if r.Flags&UseXHTML == 0 {
+		r.out(w, hrTag)
+	} else {
+		r.out(w, hrXHTMLTag)
+	}
+}
+
+// RenderNode is a default renderer of a single node of a syntax tree. For
+// block nodes it will be called twice: first time with entering=true, second
+// time with entering=false, so that it could know when it's working on an open
+// tag and when on close. It writes the result to w.
+//
+// The return value is a way to tell the calling walker to adjust its walk
+// pattern: e.g. it can terminate the traversal by returning Terminate. Or it
+// can ask the walker to skip a subtree of this node by returning SkipChildren.
+// The typical behavior is to return GoToNext, which asks for the usual
+// traversal to the next node.
+func (r *HTMLRenderer) RenderNode(w io.Writer, node *Node, entering bool) WalkStatus {
+	attrs := []string{}
+	switch node.Type {
+	case Text:
+		if r.Flags&Smartypants != 0 {
+			var tmp bytes.Buffer
+			escapeHTML(&tmp, node.Literal)
+			r.sr.Process(w, tmp.Bytes())
+		} else {
+			if node.Parent.Type == Link {
+				escLink(w, node.Literal)
+			} else {
+				escapeHTML(w, node.Literal)
+			}
+		}
+	case Softbreak:
+		r.cr(w)
+		// TODO: make it configurable via out(renderer.softbreak)
+	case Hardbreak:
+		if r.Flags&UseXHTML == 0 {
+			r.out(w, brTag)
+		} else {
+			r.out(w, brXHTMLTag)
+		}
+		r.cr(w)
+	case Emph:
+		if entering {
+			r.out(w, emTag)
+		} else {
+			r.out(w, emCloseTag)
+		}
+	case Strong:
+		if entering {
+			r.out(w, strongTag)
+		} else {
+			r.out(w, strongCloseTag)
+		}
+	case Del:
+		if entering {
+			r.out(w, delTag)
+		} else {
+			r.out(w, delCloseTag)
+		}
+	case HTMLSpan:
+		if r.Flags&SkipHTML != 0 {
+			break
+		}
+		r.out(w, node.Literal)
+	case Link:
+		// mark it but don't link it if it is not a safe link: no smartypants
+		dest := node.LinkData.Destination
+		if needSkipLink(r.Flags, dest) {
+			if entering {
+				r.out(w, ttTag)
+			} else {
+				r.out(w, ttCloseTag)
+			}
+		} else {
+			if entering {
+				dest = r.addAbsPrefix(dest)
+				var hrefBuf bytes.Buffer
+				hrefBuf.WriteString("href=\"")
+				escLink(&hrefBuf, dest)
+				hrefBuf.WriteByte('"')
+				attrs = append(attrs, hrefBuf.String())
+				if node.NoteID != 0 {
+					r.out(w, footnoteRef(r.FootnoteAnchorPrefix, node))
+					break
+				}
+				attrs = appendLinkAttrs(attrs, r.Flags, dest)
+				if len(node.LinkData.Title) > 0 {
+					var titleBuff bytes.Buffer
+					titleBuff.WriteString("title=\"")
+					escapeHTML(&titleBuff, node.LinkData.Title)
+					titleBuff.WriteByte('"')
+					attrs = append(attrs, titleBuff.String())
+				}
+				r.tag(w, aTag, attrs)
+			} else {
+				if node.NoteID != 0 {
+					break
+				}
+				r.out(w, aCloseTag)
+			}
+		}
+	case Image:
+		if r.Flags&SkipImages != 0 {
+			return SkipChildren
+		}
+		if entering {
+			dest := node.LinkData.Destination
+			dest = r.addAbsPrefix(dest)
+			if r.disableTags == 0 {
+				//if options.safe && potentiallyUnsafe(dest) {
+				//out(w, `<img src="" alt="`)
+				//} else {
+				r.out(w, []byte(`<img src="`))
+				escLink(w, dest)
+				r.out(w, []byte(`" alt="`))
+				//}
+			}
+			r.disableTags++
+		} else {
+			r.disableTags--
+			if r.disableTags == 0 {
+				if node.LinkData.Title != nil {
+					r.out(w, []byte(`" title="`))
+					escapeHTML(w, node.LinkData.Title)
+				}
+				r.out(w, []byte(`" />`))
+			}
+		}
+	case Code:
+		r.out(w, codeTag)
+		escapeHTML(w, node.Literal)
+		r.out(w, codeCloseTag)
+	case Document:
+		break
+	case Paragraph:
+		if skipParagraphTags(node) {
+			break
+		}
+		if entering {
+			// TODO: untangle this clusterfuck about when the newlines need
+			// to be added and when not.
+			if node.Prev != nil {
+				switch node.Prev.Type {
+				case HTMLBlock, List, Paragraph, Heading, CodeBlock, BlockQuote, HorizontalRule:
+					r.cr(w)
+				}
+			}
+			if node.Parent.Type == BlockQuote && node.Prev == nil {
+				r.cr(w)
+			}
+			r.out(w, pTag)
+		} else {
+			r.out(w, pCloseTag)
+			if !(node.Parent.Type == Item && node.Next == nil) {
+				r.cr(w)
+			}
+		}
+	case BlockQuote:
+		if entering {
+			r.cr(w)
+			r.out(w, blockquoteTag)
+		} else {
+			r.out(w, blockquoteCloseTag)
+			r.cr(w)
+		}
+	case HTMLBlock:
+		if r.Flags&SkipHTML != 0 {
+			break
+		}
+		r.cr(w)
+		r.out(w, node.Literal)
+		r.cr(w)
+	case Heading:
+		headingLevel := r.HTMLRendererParameters.HeadingLevelOffset + node.Level
+		openTag, closeTag := headingTagsFromLevel(headingLevel)
+		if entering {
+			if node.IsTitleblock {
+				attrs = append(attrs, `class="title"`)
+			}
+			if node.HeadingID != "" {
+				id := r.ensureUniqueHeadingID(node.HeadingID)
+				if r.HeadingIDPrefix != "" {
+					id = r.HeadingIDPrefix + id
+				}
+				if r.HeadingIDSuffix != "" {
+					id = id + r.HeadingIDSuffix
+				}
+				attrs = append(attrs, fmt.Sprintf(`id="%s"`, id))
+			}
+			r.cr(w)
+			r.tag(w, openTag, attrs)
+		} else {
+			r.out(w, closeTag)
+			if !(node.Parent.Type == Item && node.Next == nil) {
+				r.cr(w)
+			}
+		}
+	case HorizontalRule:
+		r.cr(w)
+		r.outHRTag(w)
+		r.cr(w)
+	case List:
+		openTag := ulTag
+		closeTag := ulCloseTag
+		if node.ListFlags&ListTypeOrdered != 0 {
+			openTag = olTag
+			closeTag = olCloseTag
+		}
+		if node.ListFlags&ListTypeDefinition != 0 {
+			openTag = dlTag
+			closeTag = dlCloseTag
+		}
+		if entering {
+			if node.IsFootnotesList {
+				r.out(w, footnotesDivBytes)
+				r.outHRTag(w)
+				r.cr(w)
+			}
+			r.cr(w)
+			if node.Parent.Type == Item && node.Parent.Parent.Tight {
+				r.cr(w)
+			}
+			r.tag(w, openTag[:len(openTag)-1], attrs)
+			r.cr(w)
+		} else {
+			r.out(w, closeTag)
+			//cr(w)
+			//if node.parent.Type != Item {
+			//	cr(w)
+			//}
+			if node.Parent.Type == Item && node.Next != nil {
+				r.cr(w)
+			}
+			if node.Parent.Type == Document || node.Parent.Type == BlockQuote {
+				r.cr(w)
+			}
+			if node.IsFootnotesList {
+				r.out(w, footnotesCloseDivBytes)
+			}
+		}
+	case Item:
+		openTag := liTag
+		closeTag := liCloseTag
+		if node.ListFlags&ListTypeDefinition != 0 {
+			openTag = ddTag
+			closeTag = ddCloseTag
+		}
+		if node.ListFlags&ListTypeTerm != 0 {
+			openTag = dtTag
+			closeTag = dtCloseTag
+		}
+		if entering {
+			if itemOpenCR(node) {
+				r.cr(w)
+			}
+			if node.ListData.RefLink != nil {
+				slug := slugify(node.ListData.RefLink)
+				r.out(w, footnoteItem(r.FootnoteAnchorPrefix, slug))
+				break
+			}
+			r.out(w, openTag)
+		} else {
+			if node.ListData.RefLink != nil {
+				slug := slugify(node.ListData.RefLink)
+				if r.Flags&FootnoteReturnLinks != 0 {
+					r.out(w, footnoteReturnLink(r.FootnoteAnchorPrefix, r.FootnoteReturnLinkContents, slug))
+				}
+			}
+			r.out(w, closeTag)
+			r.cr(w)
+		}
+	case CodeBlock:
+		attrs = appendLanguageAttr(attrs, node.Info)
+		r.cr(w)
+		r.out(w, preTag)
+		r.tag(w, codeTag[:len(codeTag)-1], attrs)
+		escapeHTML(w, node.Literal)
+		r.out(w, codeCloseTag)
+		r.out(w, preCloseTag)
+		if node.Parent.Type != Item {
+			r.cr(w)
+		}
+	case Table:
+		if entering {
+			r.cr(w)
+			r.out(w, tableTag)
+		} else {
+			r.out(w, tableCloseTag)
+			r.cr(w)
+		}
+	case TableCell:
+		openTag := tdTag
+		closeTag := tdCloseTag
+		if node.IsHeader {
+			openTag = thTag
+			closeTag = thCloseTag
+		}
+		if entering {
+			align := cellAlignment(node.Align)
+			if align != "" {
+				attrs = append(attrs, fmt.Sprintf(`align="%s"`, align))
+			}
+			if node.Prev == nil {
+				r.cr(w)
+			}
+			r.tag(w, openTag, attrs)
+		} else {
+			r.out(w, closeTag)
+			r.cr(w)
+		}
+	case TableHead:
+		if entering {
+			r.cr(w)
+			r.out(w, theadTag)
+		} else {
+			r.out(w, theadCloseTag)
+			r.cr(w)
+		}
+	case TableBody:
+		if entering {
+			r.cr(w)
+			r.out(w, tbodyTag)
+			// XXX: this is to adhere to a rather silly test. Should fix test.
+			if node.FirstChild == nil {
+				r.cr(w)
+			}
+		} else {
+			r.out(w, tbodyCloseTag)
+			r.cr(w)
+		}
+	case TableRow:
+		if entering {
+			r.cr(w)
+			r.out(w, trTag)
+		} else {
+			r.out(w, trCloseTag)
+			r.cr(w)
+		}
+	default:
+		panic("Unknown node type " + node.Type.String())
+	}
+	return GoToNext
+}
+
+// RenderHeader writes HTML document preamble and TOC if requested.
+func (r *HTMLRenderer) RenderHeader(w io.Writer, ast *Node) {
+	r.writeDocumentHeader(w)
+	if r.Flags&TOC != 0 {
+		r.writeTOC(w, ast)
+	}
+}
+
+// RenderFooter writes HTML document footer.
+func (r *HTMLRenderer) RenderFooter(w io.Writer, ast *Node) {
+	if r.Flags&CompletePage == 0 {
+		return
+	}
+	io.WriteString(w, "\n</body>\n</html>\n")
+}
+
+func (r *HTMLRenderer) writeDocumentHeader(w io.Writer) {
+	if r.Flags&CompletePage == 0 {
+		return
+	}
+	ending := ""
+	if r.Flags&UseXHTML != 0 {
+		io.WriteString(w, "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" ")
+		io.WriteString(w, "\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n")
+		io.WriteString(w, "<html xmlns=\"http://www.w3.org/1999/xhtml\">\n")
+		ending = " /"
+	} else {
+		io.WriteString(w, "<!DOCTYPE html>\n")
+		io.WriteString(w, "<html>\n")
+	}
+	io.WriteString(w, "<head>\n")
+	io.WriteString(w, "  <title>")
+	if r.Flags&Smartypants != 0 {
+		r.sr.Process(w, []byte(r.Title))
+	} else {
+		escapeHTML(w, []byte(r.Title))
+	}
+	io.WriteString(w, "</title>\n")
+	io.WriteString(w, "  <meta name=\"GENERATOR\" content=\"Blackfriday Markdown Processor v")
+	io.WriteString(w, Version)
+	io.WriteString(w, "\"")
+	io.WriteString(w, ending)
+	io.WriteString(w, ">\n")
+	io.WriteString(w, "  <meta charset=\"utf-8\"")
+	io.WriteString(w, ending)
+	io.WriteString(w, ">\n")
+	if r.CSS != "" {
+		io.WriteString(w, "  <link rel=\"stylesheet\" type=\"text/css\" href=\"")
+		escapeHTML(w, []byte(r.CSS))
+		io.WriteString(w, "\"")
+		io.WriteString(w, ending)
+		io.WriteString(w, ">\n")
+	}
+	if r.Icon != "" {
+		io.WriteString(w, "  <link rel=\"icon\" type=\"image/x-icon\" href=\"")
+		escapeHTML(w, []byte(r.Icon))
+		io.WriteString(w, "\"")
+		io.WriteString(w, ending)
+		io.WriteString(w, ">\n")
+	}
+	io.WriteString(w, "</head>\n")
+	io.WriteString(w, "<body>\n\n")
+}
+
+func (r *HTMLRenderer) writeTOC(w io.Writer, ast *Node) {
+	buf := bytes.Buffer{}
+
+	inHeading := false
+	tocLevel := 0
+	headingCount := 0
+
+	ast.Walk(func(node *Node, entering bool) WalkStatus {
+		if node.Type == Heading && !node.HeadingData.IsTitleblock {
+			inHeading = entering
+			if entering {
+				node.HeadingID = fmt.Sprintf("toc_%d", headingCount)
+				if node.Level == tocLevel {
+					buf.WriteString("</li>\n\n<li>")
+				} else if node.Level < tocLevel {
+					for node.Level < tocLevel {
+						tocLevel--
+						buf.WriteString("</li>\n</ul>")
+					}
+					buf.WriteString("</li>\n\n<li>")
+				} else {
+					for node.Level > tocLevel {
+						tocLevel++
+						buf.WriteString("\n<ul>\n<li>")
+					}
+				}
+
+				fmt.Fprintf(&buf, `<a href="#toc_%d">`, headingCount)
+				headingCount++
+			} else {
+				buf.WriteString("</a>")
+			}
+			return GoToNext
+		}
+
+		if inHeading {
+			return r.RenderNode(&buf, node, entering)
+		}
+
+		return GoToNext
+	})
+
+	for ; tocLevel > 0; tocLevel-- {
+		buf.WriteString("</li>\n</ul>")
+	}
+
+	if buf.Len() > 0 {
+		io.WriteString(w, "<nav>\n")
+		w.Write(buf.Bytes())
+		io.WriteString(w, "\n\n</nav>\n")
+	}
+	r.lastOutputLen = buf.Len()
+}
diff --git a/vendor/github.com/russross/blackfriday/v2/inline.go b/vendor/github.com/russross/blackfriday/v2/inline.go
new file mode 100644
index 00000000..4ed29079
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/inline.go
@@ -0,0 +1,1228 @@
+//
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+//
+
+//
+// Functions to parse inline elements.
+//
+
+package blackfriday
+
+import (
+	"bytes"
+	"regexp"
+	"strconv"
+)
+
+var (
+	urlRe    = `((https?|ftp):\/\/|\/)[-A-Za-z0-9+&@#\/%?=~_|!:,.;\(\)]+`
+	anchorRe = regexp.MustCompile(`^(<a\shref="` + urlRe + `"(\stitle="[^"<>]+")?\s?>` + urlRe + `<\/a>)`)
+
+	// https://www.w3.org/TR/html5/syntax.html#character-references
+	// highest unicode code point in 17 planes (2^20): 1,114,112d =
+	// 7 dec digits or 6 hex digits
+	// named entity references can be 2-31 characters with stuff like &lt;
+	// at one end and &CounterClockwiseContourIntegral; at the other. There
+	// are also sometimes numbers at the end, although this isn't inherent
+	// in the specification; there are never numbers anywhere else in
+	// current character references, though; see &frac34; and &blk12;, etc.
+	// https://www.w3.org/TR/html5/syntax.html#named-character-references
+	//
+	// entity := "&" (named group | number ref) ";"
+	// named group := [a-zA-Z]{2,31}[0-9]{0,2}
+	// number ref := "#" (dec ref | hex ref)
+	// dec ref := [0-9]{1,7}
+	// hex ref := ("x" | "X") [0-9a-fA-F]{1,6}
+	htmlEntityRe = regexp.MustCompile(`&([a-zA-Z]{2,31}[0-9]{0,2}|#([0-9]{1,7}|[xX][0-9a-fA-F]{1,6}));`)
+)
+
+// Functions to parse text within a block
+// Each function returns the number of chars taken care of
+// data is the complete block being rendered
+// offset is the number of valid chars before the current cursor
+
+func (p *Markdown) inline(currBlock *Node, data []byte) {
+	// handlers might call us recursively: enforce a maximum depth
+	if p.nesting >= p.maxNesting || len(data) == 0 {
+		return
+	}
+	p.nesting++
+	beg, end := 0, 0
+	for end < len(data) {
+		handler := p.inlineCallback[data[end]]
+		if handler != nil {
+			if consumed, node := handler(p, data, end); consumed == 0 {
+				// No action from the callback.
+				end++
+			} else {
+				// Copy inactive chars into the output.
+				currBlock.AppendChild(text(data[beg:end]))
+				if node != nil {
+					currBlock.AppendChild(node)
+				}
+				// Skip past whatever the callback used.
+				beg = end + consumed
+				end = beg
+			}
+		} else {
+			end++
+		}
+	}
+	if beg < len(data) {
+		if data[end-1] == '\n' {
+			end--
+		}
+		currBlock.AppendChild(text(data[beg:end]))
+	}
+	p.nesting--
+}
+
+// single and double emphasis parsing
+func emphasis(p *Markdown, data []byte, offset int) (int, *Node) {
+	data = data[offset:]
+	c := data[0]
+
+	if len(data) > 2 && data[1] != c {
+		// whitespace cannot follow an opening emphasis;
+		// strikethrough only takes two characters '~~'
+		if c == '~' || isspace(data[1]) {
+			return 0, nil
+		}
+		ret, node := helperEmphasis(p, data[1:], c)
+		if ret == 0 {
+			return 0, nil
+		}
+
+		return ret + 1, node
+	}
+
+	if len(data) > 3 && data[1] == c && data[2] != c {
+		if isspace(data[2]) {
+			return 0, nil
+		}
+		ret, node := helperDoubleEmphasis(p, data[2:], c)
+		if ret == 0 {
+			return 0, nil
+		}
+
+		return ret + 2, node
+	}
+
+	if len(data) > 4 && data[1] == c && data[2] == c && data[3] != c {
+		if c == '~' || isspace(data[3]) {
+			return 0, nil
+		}
+		ret, node := helperTripleEmphasis(p, data, 3, c)
+		if ret == 0 {
+			return 0, nil
+		}
+
+		return ret + 3, node
+	}
+
+	return 0, nil
+}
+
+func codeSpan(p *Markdown, data []byte, offset int) (int, *Node) {
+	data = data[offset:]
+
+	nb := 0
+
+	// count the number of backticks in the delimiter
+	for nb < len(data) && data[nb] == '`' {
+		nb++
+	}
+
+	// find the next delimiter
+	i, end := 0, 0
+	for end = nb; end < len(data) && i < nb; end++ {
+		if data[end] == '`' {
+			i++
+		} else {
+			i = 0
+		}
+	}
+
+	// no matching delimiter?
+	if i < nb && end >= len(data) {
+		return 0, nil
+	}
+
+	// trim outside whitespace
+	fBegin := nb
+	for fBegin < end && data[fBegin] == ' ' {
+		fBegin++
+	}
+
+	fEnd := end - nb
+	for fEnd > fBegin && data[fEnd-1] == ' ' {
+		fEnd--
+	}
+
+	// render the code span
+	if fBegin != fEnd {
+		code := NewNode(Code)
+		code.Literal = data[fBegin:fEnd]
+		return end, code
+	}
+
+	return end, nil
+}
+
+// newline preceded by two spaces becomes <br>
+func maybeLineBreak(p *Markdown, data []byte, offset int) (int, *Node) {
+	origOffset := offset
+	for offset < len(data) && data[offset] == ' ' {
+		offset++
+	}
+
+	if offset < len(data) && data[offset] == '\n' {
+		if offset-origOffset >= 2 {
+			return offset - origOffset + 1, NewNode(Hardbreak)
+		}
+		return offset - origOffset, nil
+	}
+	return 0, nil
+}
+
+// newline without two spaces works when HardLineBreak is enabled
+func lineBreak(p *Markdown, data []byte, offset int) (int, *Node) {
+	if p.extensions&HardLineBreak != 0 {
+		return 1, NewNode(Hardbreak)
+	}
+	return 0, nil
+}
+
+type linkType int
+
+const (
+	linkNormal linkType = iota
+	linkImg
+	linkDeferredFootnote
+	linkInlineFootnote
+)
+
+func isReferenceStyleLink(data []byte, pos int, t linkType) bool {
+	if t == linkDeferredFootnote {
+		return false
+	}
+	return pos < len(data)-1 && data[pos] == '[' && data[pos+1] != '^'
+}
+
+func maybeImage(p *Markdown, data []byte, offset int) (int, *Node) {
+	if offset < len(data)-1 && data[offset+1] == '[' {
+		return link(p, data, offset)
+	}
+	return 0, nil
+}
+
+func maybeInlineFootnote(p *Markdown, data []byte, offset int) (int, *Node) {
+	if offset < len(data)-1 && data[offset+1] == '[' {
+		return link(p, data, offset)
+	}
+	return 0, nil
+}
+
+// '[': parse a link or an image or a footnote
+func link(p *Markdown, data []byte, offset int) (int, *Node) {
+	// no links allowed inside regular links, footnote, and deferred footnotes
+	if p.insideLink && (offset > 0 && data[offset-1] == '[' || len(data)-1 > offset && data[offset+1] == '^') {
+		return 0, nil
+	}
+
+	var t linkType
+	switch {
+	// special case: ![^text] == deferred footnote (that follows something with
+	// an exclamation point)
+	case p.extensions&Footnotes != 0 && len(data)-1 > offset && data[offset+1] == '^':
+		t = linkDeferredFootnote
+	// ![alt] == image
+	case offset >= 0 && data[offset] == '!':
+		t = linkImg
+		offset++
+	// ^[text] == inline footnote
+	// [^refId] == deferred footnote
+	case p.extensions&Footnotes != 0:
+		if offset >= 0 && data[offset] == '^' {
+			t = linkInlineFootnote
+			offset++
+		} else if len(data)-1 > offset && data[offset+1] == '^' {
+			t = linkDeferredFootnote
+		}
+	// [text] == regular link
+	default:
+		t = linkNormal
+	}
+
+	data = data[offset:]
+
+	var (
+		i                       = 1
+		noteID                  int
+		title, link, altContent []byte
+		textHasNl               = false
+	)
+
+	if t == linkDeferredFootnote {
+		i++
+	}
+
+	// look for the matching closing bracket
+	for level := 1; level > 0 && i < len(data); i++ {
+		switch {
+		case data[i] == '\n':
+			textHasNl = true
+
+		case data[i-1] == '\\':
+			continue
+
+		case data[i] == '[':
+			level++
+
+		case data[i] == ']':
+			level--
+			if level <= 0 {
+				i-- // compensate for extra i++ in for loop
+			}
+		}
+	}
+
+	if i >= len(data) {
+		return 0, nil
+	}
+
+	txtE := i
+	i++
+	var footnoteNode *Node
+
+	// skip any amount of whitespace or newline
+	// (this is much more lax than original markdown syntax)
+	for i < len(data) && isspace(data[i]) {
+		i++
+	}
+
+	// inline style link
+	switch {
+	case i < len(data) && data[i] == '(':
+		// skip initial whitespace
+		i++
+
+		for i < len(data) && isspace(data[i]) {
+			i++
+		}
+
+		linkB := i
+
+		// look for link end: ' " )
+	findlinkend:
+		for i < len(data) {
+			switch {
+			case data[i] == '\\':
+				i += 2
+
+			case data[i] == ')' || data[i] == '\'' || data[i] == '"':
+				break findlinkend
+
+			default:
+				i++
+			}
+		}
+
+		if i >= len(data) {
+			return 0, nil
+		}
+		linkE := i
+
+		// look for title end if present
+		titleB, titleE := 0, 0
+		if data[i] == '\'' || data[i] == '"' {
+			i++
+			titleB = i
+
+		findtitleend:
+			for i < len(data) {
+				switch {
+				case data[i] == '\\':
+					i += 2
+
+				case data[i] == ')':
+					break findtitleend
+
+				default:
+					i++
+				}
+			}
+
+			if i >= len(data) {
+				return 0, nil
+			}
+
+			// skip whitespace after title
+			titleE = i - 1
+			for titleE > titleB && isspace(data[titleE]) {
+				titleE--
+			}
+
+			// check for closing quote presence
+			if data[titleE] != '\'' && data[titleE] != '"' {
+				titleB, titleE = 0, 0
+				linkE = i
+			}
+		}
+
+		// remove whitespace at the end of the link
+		for linkE > linkB && isspace(data[linkE-1]) {
+			linkE--
+		}
+
+		// remove optional angle brackets around the link
+		if data[linkB] == '<' {
+			linkB++
+		}
+		if data[linkE-1] == '>' {
+			linkE--
+		}
+
+		// build escaped link and title
+		if linkE > linkB {
+			link = data[linkB:linkE]
+		}
+
+		if titleE > titleB {
+			title = data[titleB:titleE]
+		}
+
+		i++
+
+	// reference style link
+	case isReferenceStyleLink(data, i, t):
+		var id []byte
+		altContentConsidered := false
+
+		// look for the id
+		i++
+		linkB := i
+		for i < len(data) && data[i] != ']' {
+			i++
+		}
+		if i >= len(data) {
+			return 0, nil
+		}
+		linkE := i
+
+		// find the reference
+		if linkB == linkE {
+			if textHasNl {
+				var b bytes.Buffer
+
+				for j := 1; j < txtE; j++ {
+					switch {
+					case data[j] != '\n':
+						b.WriteByte(data[j])
+					case data[j-1] != ' ':
+						b.WriteByte(' ')
+					}
+				}
+
+				id = b.Bytes()
+			} else {
+				id = data[1:txtE]
+				altContentConsidered = true
+			}
+		} else {
+			id = data[linkB:linkE]
+		}
+
+		// find the reference with matching id
+		lr, ok := p.getRef(string(id))
+		if !ok {
+			return 0, nil
+		}
+
+		// keep link and title from reference
+		link = lr.link
+		title = lr.title
+		if altContentConsidered {
+			altContent = lr.text
+		}
+		i++
+
+	// shortcut reference style link or reference or inline footnote
+	default:
+		var id []byte
+
+		// craft the id
+		if textHasNl {
+			var b bytes.Buffer
+
+			for j := 1; j < txtE; j++ {
+				switch {
+				case data[j] != '\n':
+					b.WriteByte(data[j])
+				case data[j-1] != ' ':
+					b.WriteByte(' ')
+				}
+			}
+
+			id = b.Bytes()
+		} else {
+			if t == linkDeferredFootnote {
+				id = data[2:txtE] // get rid of the ^
+			} else {
+				id = data[1:txtE]
+			}
+		}
+
+		footnoteNode = NewNode(Item)
+		if t == linkInlineFootnote {
+			// create a new reference
+			noteID = len(p.notes) + 1
+
+			var fragment []byte
+			if len(id) > 0 {
+				if len(id) < 16 {
+					fragment = make([]byte, len(id))
+				} else {
+					fragment = make([]byte, 16)
+				}
+				copy(fragment, slugify(id))
+			} else {
+				fragment = append([]byte("footnote-"), []byte(strconv.Itoa(noteID))...)
+			}
+
+			ref := &reference{
+				noteID:   noteID,
+				hasBlock: false,
+				link:     fragment,
+				title:    id,
+				footnote: footnoteNode,
+			}
+
+			p.notes = append(p.notes, ref)
+
+			link = ref.link
+			title = ref.title
+		} else {
+			// find the reference with matching id
+			lr, ok := p.getRef(string(id))
+			if !ok {
+				return 0, nil
+			}
+
+			if t == linkDeferredFootnote {
+				lr.noteID = len(p.notes) + 1
+				lr.footnote = footnoteNode
+				p.notes = append(p.notes, lr)
+			}
+
+			// keep link and title from reference
+			link = lr.link
+			// if inline footnote, title == footnote contents
+			title = lr.title
+			noteID = lr.noteID
+		}
+
+		// rewind the whitespace
+		i = txtE + 1
+	}
+
+	var uLink []byte
+	if t == linkNormal || t == linkImg {
+		if len(link) > 0 {
+			var uLinkBuf bytes.Buffer
+			unescapeText(&uLinkBuf, link)
+			uLink = uLinkBuf.Bytes()
+		}
+
+		// links need something to click on and somewhere to go
+		if len(uLink) == 0 || (t == linkNormal && txtE <= 1) {
+			return 0, nil
+		}
+	}
+
+	// call the relevant rendering function
+	var linkNode *Node
+	switch t {
+	case linkNormal:
+		linkNode = NewNode(Link)
+		linkNode.Destination = normalizeURI(uLink)
+		linkNode.Title = title
+		if len(altContent) > 0 {
+			linkNode.AppendChild(text(altContent))
+		} else {
+			// links cannot contain other links, so turn off link parsing
+			// temporarily and recurse
+			insideLink := p.insideLink
+			p.insideLink = true
+			p.inline(linkNode, data[1:txtE])
+			p.insideLink = insideLink
+		}
+
+	case linkImg:
+		linkNode = NewNode(Image)
+		linkNode.Destination = uLink
+		linkNode.Title = title
+		linkNode.AppendChild(text(data[1:txtE]))
+		i++
+
+	case linkInlineFootnote, linkDeferredFootnote:
+		linkNode = NewNode(Link)
+		linkNode.Destination = link
+		linkNode.Title = title
+		linkNode.NoteID = noteID
+		linkNode.Footnote = footnoteNode
+		if t == linkInlineFootnote {
+			i++
+		}
+
+	default:
+		return 0, nil
+	}
+
+	return i, linkNode
+}
+
+func (p *Markdown) inlineHTMLComment(data []byte) int {
+	if len(data) < 5 {
+		return 0
+	}
+	if data[0] != '<' || data[1] != '!' || data[2] != '-' || data[3] != '-' {
+		return 0
+	}
+	i := 5
+	// scan for an end-of-comment marker, across lines if necessary
+	for i < len(data) && !(data[i-2] == '-' && data[i-1] == '-' && data[i] == '>') {
+		i++
+	}
+	// no end-of-comment marker
+	if i >= len(data) {
+		return 0
+	}
+	return i + 1
+}
+
+func stripMailto(link []byte) []byte {
+	if bytes.HasPrefix(link, []byte("mailto://")) {
+		return link[9:]
+	} else if bytes.HasPrefix(link, []byte("mailto:")) {
+		return link[7:]
+	} else {
+		return link
+	}
+}
+
+// autolinkType specifies a kind of autolink that gets detected.
+type autolinkType int
+
+// These are the possible flag values for the autolink renderer.
+const (
+	notAutolink autolinkType = iota
+	normalAutolink
+	emailAutolink
+)
+
+// '<' when tags or autolinks are allowed
+func leftAngle(p *Markdown, data []byte, offset int) (int, *Node) {
+	data = data[offset:]
+	altype, end := tagLength(data)
+	if size := p.inlineHTMLComment(data); size > 0 {
+		end = size
+	}
+	if end > 2 {
+		if altype != notAutolink {
+			var uLink bytes.Buffer
+			unescapeText(&uLink, data[1:end+1-2])
+			if uLink.Len() > 0 {
+				link := uLink.Bytes()
+				node := NewNode(Link)
+				node.Destination = link
+				if altype == emailAutolink {
+					node.Destination = append([]byte("mailto:"), link...)
+				}
+				node.AppendChild(text(stripMailto(link)))
+				return end, node
+			}
+		} else {
+			htmlTag := NewNode(HTMLSpan)
+			htmlTag.Literal = data[:end]
+			return end, htmlTag
+		}
+	}
+
+	return end, nil
+}
+
+// '\\' backslash escape
+var escapeChars = []byte("\\`*_{}[]()#+-.!:|&<>~")
+
+func escape(p *Markdown, data []byte, offset int) (int, *Node) {
+	data = data[offset:]
+
+	if len(data) > 1 {
+		if p.extensions&BackslashLineBreak != 0 && data[1] == '\n' {
+			return 2, NewNode(Hardbreak)
+		}
+		if bytes.IndexByte(escapeChars, data[1]) < 0 {
+			return 0, nil
+		}
+
+		return 2, text(data[1:2])
+	}
+
+	return 2, nil
+}
+
+func unescapeText(ob *bytes.Buffer, src []byte) {
+	i := 0
+	for i < len(src) {
+		org := i
+		for i < len(src) && src[i] != '\\' {
+			i++
+		}
+
+		if i > org {
+			ob.Write(src[org:i])
+		}
+
+		if i+1 >= len(src) {
+			break
+		}
+
+		ob.WriteByte(src[i+1])
+		i += 2
+	}
+}
+
+// '&' escaped when it doesn't belong to an entity
+// valid entities are assumed to be anything matching &#?[A-Za-z0-9]+;
+func entity(p *Markdown, data []byte, offset int) (int, *Node) {
+	data = data[offset:]
+
+	end := 1
+
+	if end < len(data) && data[end] == '#' {
+		end++
+	}
+
+	for end < len(data) && isalnum(data[end]) {
+		end++
+	}
+
+	if end < len(data) && data[end] == ';' {
+		end++ // real entity
+	} else {
+		return 0, nil // lone '&'
+	}
+
+	ent := data[:end]
+	// undo &amp; escaping or it will be converted to &amp;amp; by another
+	// escaper in the renderer
+	if bytes.Equal(ent, []byte("&amp;")) {
+		ent = []byte{'&'}
+	}
+
+	return end, text(ent)
+}
+
+func linkEndsWithEntity(data []byte, linkEnd int) bool {
+	entityRanges := htmlEntityRe.FindAllIndex(data[:linkEnd], -1)
+	return entityRanges != nil && entityRanges[len(entityRanges)-1][1] == linkEnd
+}
+
+// hasPrefixCaseInsensitive is a custom implementation of
+//     strings.HasPrefix(strings.ToLower(s), prefix)
+// we rolled our own because ToLower pulls in a huge machinery of lowercasing
+// anything from Unicode and that's very slow. Since this func will only be
+// used on ASCII protocol prefixes, we can take shortcuts.
+func hasPrefixCaseInsensitive(s, prefix []byte) bool {
+	if len(s) < len(prefix) {
+		return false
+	}
+	delta := byte('a' - 'A')
+	for i, b := range prefix {
+		if b != s[i] && b != s[i]+delta {
+			return false
+		}
+	}
+	return true
+}
+
+var protocolPrefixes = [][]byte{
+	[]byte("http://"),
+	[]byte("https://"),
+	[]byte("ftp://"),
+	[]byte("file://"),
+	[]byte("mailto:"),
+}
+
+const shortestPrefix = 6 // len("ftp://"), the shortest of the above
+
+func maybeAutoLink(p *Markdown, data []byte, offset int) (int, *Node) {
+	// quick check to rule out most false hits
+	if p.insideLink || len(data) < offset+shortestPrefix {
+		return 0, nil
+	}
+	for _, prefix := range protocolPrefixes {
+		endOfHead := offset + 8 // 8 is the len() of the longest prefix
+		if endOfHead > len(data) {
+			endOfHead = len(data)
+		}
+		if hasPrefixCaseInsensitive(data[offset:endOfHead], prefix) {
+			return autoLink(p, data, offset)
+		}
+	}
+	return 0, nil
+}
+
+func autoLink(p *Markdown, data []byte, offset int) (int, *Node) {
+	// Now a more expensive check to see if we're not inside an anchor element
+	anchorStart := offset
+	offsetFromAnchor := 0
+	for anchorStart > 0 && data[anchorStart] != '<' {
+		anchorStart--
+		offsetFromAnchor++
+	}
+
+	anchorStr := anchorRe.Find(data[anchorStart:])
+	if anchorStr != nil {
+		anchorClose := NewNode(HTMLSpan)
+		anchorClose.Literal = anchorStr[offsetFromAnchor:]
+		return len(anchorStr) - offsetFromAnchor, anchorClose
+	}
+
+	// scan backward for a word boundary
+	rewind := 0
+	for offset-rewind > 0 && rewind <= 7 && isletter(data[offset-rewind-1]) {
+		rewind++
+	}
+	if rewind > 6 { // longest supported protocol is "mailto" which has 6 letters
+		return 0, nil
+	}
+
+	origData := data
+	data = data[offset-rewind:]
+
+	if !isSafeLink(data) {
+		return 0, nil
+	}
+
+	linkEnd := 0
+	for linkEnd < len(data) && !isEndOfLink(data[linkEnd]) {
+		linkEnd++
+	}
+
+	// Skip punctuation at the end of the link
+	if (data[linkEnd-1] == '.' || data[linkEnd-1] == ',') && data[linkEnd-2] != '\\' {
+		linkEnd--
+	}
+
+	// But don't skip semicolon if it's a part of escaped entity:
+	if data[linkEnd-1] == ';' && data[linkEnd-2] != '\\' && !linkEndsWithEntity(data, linkEnd) {
+		linkEnd--
+	}
+
+	// See if the link finishes with a punctuation sign that can be closed.
+	var copen byte
+	switch data[linkEnd-1] {
+	case '"':
+		copen = '"'
+	case '\'':
+		copen = '\''
+	case ')':
+		copen = '('
+	case ']':
+		copen = '['
+	case '}':
+		copen = '{'
+	default:
+		copen = 0
+	}
+
+	if copen != 0 {
+		bufEnd := offset - rewind + linkEnd - 2
+
+		openDelim := 1
+
+		/* Try to close the final punctuation sign in this same line;
+		 * if we managed to close it outside of the URL, that means that it's
+		 * not part of the URL. If it closes inside the URL, that means it
+		 * is part of the URL.
+		 *
+		 * Examples:
+		 *
+		 *      foo http://www.pokemon.com/Pikachu_(Electric) bar
+		 *              => http://www.pokemon.com/Pikachu_(Electric)
+		 *
+		 *      foo (http://www.pokemon.com/Pikachu_(Electric)) bar
+		 *              => http://www.pokemon.com/Pikachu_(Electric)
+		 *
+		 *      foo http://www.pokemon.com/Pikachu_(Electric)) bar
+		 *              => http://www.pokemon.com/Pikachu_(Electric))
+		 *
+		 *      (foo http://www.pokemon.com/Pikachu_(Electric)) bar
+		 *              => foo http://www.pokemon.com/Pikachu_(Electric)
+		 */
+
+		for bufEnd >= 0 && origData[bufEnd] != '\n' && openDelim != 0 {
+			if origData[bufEnd] == data[linkEnd-1] {
+				openDelim++
+			}
+
+			if origData[bufEnd] == copen {
+				openDelim--
+			}
+
+			bufEnd--
+		}
+
+		if openDelim == 0 {
+			linkEnd--
+		}
+	}
+
+	var uLink bytes.Buffer
+	unescapeText(&uLink, data[:linkEnd])
+
+	if uLink.Len() > 0 {
+		node := NewNode(Link)
+		node.Destination = uLink.Bytes()
+		node.AppendChild(text(uLink.Bytes()))
+		return linkEnd, node
+	}
+
+	return linkEnd, nil
+}
+
+func isEndOfLink(char byte) bool {
+	return isspace(char) || char == '<'
+}
+
+var validUris = [][]byte{[]byte("http://"), []byte("https://"), []byte("ftp://"), []byte("mailto://")}
+var validPaths = [][]byte{[]byte("/"), []byte("./"), []byte("../")}
+
+func isSafeLink(link []byte) bool {
+	for _, path := range validPaths {
+		if len(link) >= len(path) && bytes.Equal(link[:len(path)], path) {
+			if len(link) == len(path) {
+				return true
+			} else if isalnum(link[len(path)]) {
+				return true
+			}
+		}
+	}
+
+	for _, prefix := range validUris {
+		// TODO: handle unicode here
+		// case-insensitive prefix test
+		if len(link) > len(prefix) && bytes.Equal(bytes.ToLower(link[:len(prefix)]), prefix) && isalnum(link[len(prefix)]) {
+			return true
+		}
+	}
+
+	return false
+}
+
+// return the length of the given tag, or 0 is it's not valid
+func tagLength(data []byte) (autolink autolinkType, end int) {
+	var i, j int
+
+	// a valid tag can't be shorter than 3 chars
+	if len(data) < 3 {
+		return notAutolink, 0
+	}
+
+	// begins with a '<' optionally followed by '/', followed by letter or number
+	if data[0] != '<' {
+		return notAutolink, 0
+	}
+	if data[1] == '/' {
+		i = 2
+	} else {
+		i = 1
+	}
+
+	if !isalnum(data[i]) {
+		return notAutolink, 0
+	}
+
+	// scheme test
+	autolink = notAutolink
+
+	// try to find the beginning of an URI
+	for i < len(data) && (isalnum(data[i]) || data[i] == '.' || data[i] == '+' || data[i] == '-') {
+		i++
+	}
+
+	if i > 1 && i < len(data) && data[i] == '@' {
+		if j = isMailtoAutoLink(data[i:]); j != 0 {
+			return emailAutolink, i + j
+		}
+	}
+
+	if i > 2 && i < len(data) && data[i] == ':' {
+		autolink = normalAutolink
+		i++
+	}
+
+	// complete autolink test: no whitespace or ' or "
+	switch {
+	case i >= len(data):
+		autolink = notAutolink
+	case autolink != notAutolink:
+		j = i
+
+		for i < len(data) {
+			if data[i] == '\\' {
+				i += 2
+			} else if data[i] == '>' || data[i] == '\'' || data[i] == '"' || isspace(data[i]) {
+				break
+			} else {
+				i++
+			}
+
+		}
+
+		if i >= len(data) {
+			return autolink, 0
+		}
+		if i > j && data[i] == '>' {
+			return autolink, i + 1
+		}
+
+		// one of the forbidden chars has been found
+		autolink = notAutolink
+	}
+	i += bytes.IndexByte(data[i:], '>')
+	if i < 0 {
+		return autolink, 0
+	}
+	return autolink, i + 1
+}
+
+// look for the address part of a mail autolink and '>'
+// this is less strict than the original markdown e-mail address matching
+func isMailtoAutoLink(data []byte) int {
+	nb := 0
+
+	// address is assumed to be: [-@._a-zA-Z0-9]+ with exactly one '@'
+	for i := 0; i < len(data); i++ {
+		if isalnum(data[i]) {
+			continue
+		}
+
+		switch data[i] {
+		case '@':
+			nb++
+
+		case '-', '.', '_':
+			break
+
+		case '>':
+			if nb == 1 {
+				return i + 1
+			}
+			return 0
+		default:
+			return 0
+		}
+	}
+
+	return 0
+}
+
+// look for the next emph char, skipping other constructs
+func helperFindEmphChar(data []byte, c byte) int {
+	i := 0
+
+	for i < len(data) {
+		for i < len(data) && data[i] != c && data[i] != '`' && data[i] != '[' {
+			i++
+		}
+		if i >= len(data) {
+			return 0
+		}
+		// do not count escaped chars
+		if i != 0 && data[i-1] == '\\' {
+			i++
+			continue
+		}
+		if data[i] == c {
+			return i
+		}
+
+		if data[i] == '`' {
+			// skip a code span
+			tmpI := 0
+			i++
+			for i < len(data) && data[i] != '`' {
+				if tmpI == 0 && data[i] == c {
+					tmpI = i
+				}
+				i++
+			}
+			if i >= len(data) {
+				return tmpI
+			}
+			i++
+		} else if data[i] == '[' {
+			// skip a link
+			tmpI := 0
+			i++
+			for i < len(data) && data[i] != ']' {
+				if tmpI == 0 && data[i] == c {
+					tmpI = i
+				}
+				i++
+			}
+			i++
+			for i < len(data) && (data[i] == ' ' || data[i] == '\n') {
+				i++
+			}
+			if i >= len(data) {
+				return tmpI
+			}
+			if data[i] != '[' && data[i] != '(' { // not a link
+				if tmpI > 0 {
+					return tmpI
+				}
+				continue
+			}
+			cc := data[i]
+			i++
+			for i < len(data) && data[i] != cc {
+				if tmpI == 0 && data[i] == c {
+					return i
+				}
+				i++
+			}
+			if i >= len(data) {
+				return tmpI
+			}
+			i++
+		}
+	}
+	return 0
+}
+
+func helperEmphasis(p *Markdown, data []byte, c byte) (int, *Node) {
+	i := 0
+
+	// skip one symbol if coming from emph3
+	if len(data) > 1 && data[0] == c && data[1] == c {
+		i = 1
+	}
+
+	for i < len(data) {
+		length := helperFindEmphChar(data[i:], c)
+		if length == 0 {
+			return 0, nil
+		}
+		i += length
+		if i >= len(data) {
+			return 0, nil
+		}
+
+		if i+1 < len(data) && data[i+1] == c {
+			i++
+			continue
+		}
+
+		if data[i] == c && !isspace(data[i-1]) {
+
+			if p.extensions&NoIntraEmphasis != 0 {
+				if !(i+1 == len(data) || isspace(data[i+1]) || ispunct(data[i+1])) {
+					continue
+				}
+			}
+
+			emph := NewNode(Emph)
+			p.inline(emph, data[:i])
+			return i + 1, emph
+		}
+	}
+
+	return 0, nil
+}
+
+func helperDoubleEmphasis(p *Markdown, data []byte, c byte) (int, *Node) {
+	i := 0
+
+	for i < len(data) {
+		length := helperFindEmphChar(data[i:], c)
+		if length == 0 {
+			return 0, nil
+		}
+		i += length
+
+		if i+1 < len(data) && data[i] == c && data[i+1] == c && i > 0 && !isspace(data[i-1]) {
+			nodeType := Strong
+			if c == '~' {
+				nodeType = Del
+			}
+			node := NewNode(nodeType)
+			p.inline(node, data[:i])
+			return i + 2, node
+		}
+		i++
+	}
+	return 0, nil
+}
+
+func helperTripleEmphasis(p *Markdown, data []byte, offset int, c byte) (int, *Node) {
+	i := 0
+	origData := data
+	data = data[offset:]
+
+	for i < len(data) {
+		length := helperFindEmphChar(data[i:], c)
+		if length == 0 {
+			return 0, nil
+		}
+		i += length
+
+		// skip whitespace preceded symbols
+		if data[i] != c || isspace(data[i-1]) {
+			continue
+		}
+
+		switch {
+		case i+2 < len(data) && data[i+1] == c && data[i+2] == c:
+			// triple symbol found
+			strong := NewNode(Strong)
+			em := NewNode(Emph)
+			strong.AppendChild(em)
+			p.inline(em, data[:i])
+			return i + 3, strong
+		case (i+1 < len(data) && data[i+1] == c):
+			// double symbol found, hand over to emph1
+			length, node := helperEmphasis(p, origData[offset-2:], c)
+			if length == 0 {
+				return 0, nil
+			}
+			return length - 2, node
+		default:
+			// single symbol found, hand over to emph2
+			length, node := helperDoubleEmphasis(p, origData[offset-1:], c)
+			if length == 0 {
+				return 0, nil
+			}
+			return length - 1, node
+		}
+	}
+	return 0, nil
+}
+
+func text(s []byte) *Node {
+	node := NewNode(Text)
+	node.Literal = s
+	return node
+}
+
+func normalizeURI(s []byte) []byte {
+	return s // TODO: implement
+}
diff --git a/vendor/github.com/russross/blackfriday/v2/markdown.go b/vendor/github.com/russross/blackfriday/v2/markdown.go
new file mode 100644
index 00000000..58d2e453
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/markdown.go
@@ -0,0 +1,950 @@
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+
+package blackfriday
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strings"
+	"unicode/utf8"
+)
+
+//
+// Markdown parsing and processing
+//
+
+// Version string of the package. Appears in the rendered document when
+// CompletePage flag is on.
+const Version = "2.0"
+
+// Extensions is a bitwise or'ed collection of enabled Blackfriday's
+// extensions.
+type Extensions int
+
+// These are the supported markdown parsing extensions.
+// OR these values together to select multiple extensions.
+const (
+	NoExtensions           Extensions = 0
+	NoIntraEmphasis        Extensions = 1 << iota // Ignore emphasis markers inside words
+	Tables                                        // Render tables
+	FencedCode                                    // Render fenced code blocks
+	Autolink                                      // Detect embedded URLs that are not explicitly marked
+	Strikethrough                                 // Strikethrough text using ~~test~~
+	LaxHTMLBlocks                                 // Loosen up HTML block parsing rules
+	SpaceHeadings                                 // Be strict about prefix heading rules
+	HardLineBreak                                 // Translate newlines into line breaks
+	TabSizeEight                                  // Expand tabs to eight spaces instead of four
+	Footnotes                                     // Pandoc-style footnotes
+	NoEmptyLineBeforeBlock                        // No need to insert an empty line to start a (code, quote, ordered list, unordered list) block
+	HeadingIDs                                    // specify heading IDs  with {#id}
+	Titleblock                                    // Titleblock ala pandoc
+	AutoHeadingIDs                                // Create the heading ID from the text
+	BackslashLineBreak                            // Translate trailing backslashes into line breaks
+	DefinitionLists                               // Render definition lists
+
+	CommonHTMLFlags HTMLFlags = UseXHTML | Smartypants |
+		SmartypantsFractions | SmartypantsDashes | SmartypantsLatexDashes
+
+	CommonExtensions Extensions = NoIntraEmphasis | Tables | FencedCode |
+		Autolink | Strikethrough | SpaceHeadings | HeadingIDs |
+		BackslashLineBreak | DefinitionLists
+)
+
+// ListType contains bitwise or'ed flags for list and list item objects.
+type ListType int
+
+// These are the possible flag values for the ListItem renderer.
+// Multiple flag values may be ORed together.
+// These are mostly of interest if you are writing a new output format.
+const (
+	ListTypeOrdered ListType = 1 << iota
+	ListTypeDefinition
+	ListTypeTerm
+
+	ListItemContainsBlock
+	ListItemBeginningOfList // TODO: figure out if this is of any use now
+	ListItemEndOfList
+)
+
+// CellAlignFlags holds a type of alignment in a table cell.
+type CellAlignFlags int
+
+// These are the possible flag values for the table cell renderer.
+// Only a single one of these values will be used; they are not ORed together.
+// These are mostly of interest if you are writing a new output format.
+const (
+	TableAlignmentLeft CellAlignFlags = 1 << iota
+	TableAlignmentRight
+	TableAlignmentCenter = (TableAlignmentLeft | TableAlignmentRight)
+)
+
+// The size of a tab stop.
+const (
+	TabSizeDefault = 4
+	TabSizeDouble  = 8
+)
+
+// blockTags is a set of tags that are recognized as HTML block tags.
+// Any of these can be included in markdown text without special escaping.
+var blockTags = map[string]struct{}{
+	"blockquote": {},
+	"del":        {},
+	"div":        {},
+	"dl":         {},
+	"fieldset":   {},
+	"form":       {},
+	"h1":         {},
+	"h2":         {},
+	"h3":         {},
+	"h4":         {},
+	"h5":         {},
+	"h6":         {},
+	"iframe":     {},
+	"ins":        {},
+	"math":       {},
+	"noscript":   {},
+	"ol":         {},
+	"pre":        {},
+	"p":          {},
+	"script":     {},
+	"style":      {},
+	"table":      {},
+	"ul":         {},
+
+	// HTML5
+	"address":    {},
+	"article":    {},
+	"aside":      {},
+	"canvas":     {},
+	"figcaption": {},
+	"figure":     {},
+	"footer":     {},
+	"header":     {},
+	"hgroup":     {},
+	"main":       {},
+	"nav":        {},
+	"output":     {},
+	"progress":   {},
+	"section":    {},
+	"video":      {},
+}
+
+// Renderer is the rendering interface. This is mostly of interest if you are
+// implementing a new rendering format.
+//
+// Only an HTML implementation is provided in this repository, see the README
+// for external implementations.
+type Renderer interface {
+	// RenderNode is the main rendering method. It will be called once for
+	// every leaf node and twice for every non-leaf node (first with
+	// entering=true, then with entering=false). The method should write its
+	// rendition of the node to the supplied writer w.
+	RenderNode(w io.Writer, node *Node, entering bool) WalkStatus
+
+	// RenderHeader is a method that allows the renderer to produce some
+	// content preceding the main body of the output document. The header is
+	// understood in the broad sense here. For example, the default HTML
+	// renderer will write not only the HTML document preamble, but also the
+	// table of contents if it was requested.
+	//
+	// The method will be passed an entire document tree, in case a particular
+	// implementation needs to inspect it to produce output.
+	//
+	// The output should be written to the supplied writer w. If your
+	// implementation has no header to write, supply an empty implementation.
+	RenderHeader(w io.Writer, ast *Node)
+
+	// RenderFooter is a symmetric counterpart of RenderHeader.
+	RenderFooter(w io.Writer, ast *Node)
+}
+
+// Callback functions for inline parsing. One such function is defined
+// for each character that triggers a response when parsing inline data.
+type inlineParser func(p *Markdown, data []byte, offset int) (int, *Node)
+
+// Markdown is a type that holds extensions and the runtime state used by
+// Parse, and the renderer. You can not use it directly, construct it with New.
+type Markdown struct {
+	renderer          Renderer
+	referenceOverride ReferenceOverrideFunc
+	refs              map[string]*reference
+	inlineCallback    [256]inlineParser
+	extensions        Extensions
+	nesting           int
+	maxNesting        int
+	insideLink        bool
+
+	// Footnotes need to be ordered as well as available to quickly check for
+	// presence. If a ref is also a footnote, it's stored both in refs and here
+	// in notes. Slice is nil if footnotes not enabled.
+	notes []*reference
+
+	doc                  *Node
+	tip                  *Node // = doc
+	oldTip               *Node
+	lastMatchedContainer *Node // = doc
+	allClosed            bool
+}
+
+func (p *Markdown) getRef(refid string) (ref *reference, found bool) {
+	if p.referenceOverride != nil {
+		r, overridden := p.referenceOverride(refid)
+		if overridden {
+			if r == nil {
+				return nil, false
+			}
+			return &reference{
+				link:     []byte(r.Link),
+				title:    []byte(r.Title),
+				noteID:   0,
+				hasBlock: false,
+				text:     []byte(r.Text)}, true
+		}
+	}
+	// refs are case insensitive
+	ref, found = p.refs[strings.ToLower(refid)]
+	return ref, found
+}
+
+func (p *Markdown) finalize(block *Node) {
+	above := block.Parent
+	block.open = false
+	p.tip = above
+}
+
+func (p *Markdown) addChild(node NodeType, offset uint32) *Node {
+	return p.addExistingChild(NewNode(node), offset)
+}
+
+func (p *Markdown) addExistingChild(node *Node, offset uint32) *Node {
+	for !p.tip.canContain(node.Type) {
+		p.finalize(p.tip)
+	}
+	p.tip.AppendChild(node)
+	p.tip = node
+	return node
+}
+
+func (p *Markdown) closeUnmatchedBlocks() {
+	if !p.allClosed {
+		for p.oldTip != p.lastMatchedContainer {
+			parent := p.oldTip.Parent
+			p.finalize(p.oldTip)
+			p.oldTip = parent
+		}
+		p.allClosed = true
+	}
+}
+
+//
+//
+// Public interface
+//
+//
+
+// Reference represents the details of a link.
+// See the documentation in Options for more details on use-case.
+type Reference struct {
+	// Link is usually the URL the reference points to.
+	Link string
+	// Title is the alternate text describing the link in more detail.
+	Title string
+	// Text is the optional text to override the ref with if the syntax used was
+	// [refid][]
+	Text string
+}
+
+// ReferenceOverrideFunc is expected to be called with a reference string and
+// return either a valid Reference type that the reference string maps to or
+// nil. If overridden is false, the default reference logic will be executed.
+// See the documentation in Options for more details on use-case.
+type ReferenceOverrideFunc func(reference string) (ref *Reference, overridden bool)
+
+// New constructs a Markdown processor. You can use the same With* functions as
+// for Run() to customize parser's behavior and the renderer.
+func New(opts ...Option) *Markdown {
+	var p Markdown
+	for _, opt := range opts {
+		opt(&p)
+	}
+	p.refs = make(map[string]*reference)
+	p.maxNesting = 16
+	p.insideLink = false
+	docNode := NewNode(Document)
+	p.doc = docNode
+	p.tip = docNode
+	p.oldTip = docNode
+	p.lastMatchedContainer = docNode
+	p.allClosed = true
+	// register inline parsers
+	p.inlineCallback[' '] = maybeLineBreak
+	p.inlineCallback['*'] = emphasis
+	p.inlineCallback['_'] = emphasis
+	if p.extensions&Strikethrough != 0 {
+		p.inlineCallback['~'] = emphasis
+	}
+	p.inlineCallback['`'] = codeSpan
+	p.inlineCallback['\n'] = lineBreak
+	p.inlineCallback['['] = link
+	p.inlineCallback['<'] = leftAngle
+	p.inlineCallback['\\'] = escape
+	p.inlineCallback['&'] = entity
+	p.inlineCallback['!'] = maybeImage
+	p.inlineCallback['^'] = maybeInlineFootnote
+	if p.extensions&Autolink != 0 {
+		p.inlineCallback['h'] = maybeAutoLink
+		p.inlineCallback['m'] = maybeAutoLink
+		p.inlineCallback['f'] = maybeAutoLink
+		p.inlineCallback['H'] = maybeAutoLink
+		p.inlineCallback['M'] = maybeAutoLink
+		p.inlineCallback['F'] = maybeAutoLink
+	}
+	if p.extensions&Footnotes != 0 {
+		p.notes = make([]*reference, 0)
+	}
+	return &p
+}
+
+// Option customizes the Markdown processor's default behavior.
+type Option func(*Markdown)
+
+// WithRenderer allows you to override the default renderer.
+func WithRenderer(r Renderer) Option {
+	return func(p *Markdown) {
+		p.renderer = r
+	}
+}
+
+// WithExtensions allows you to pick some of the many extensions provided by
+// Blackfriday. You can bitwise OR them.
+func WithExtensions(e Extensions) Option {
+	return func(p *Markdown) {
+		p.extensions = e
+	}
+}
+
+// WithNoExtensions turns off all extensions and custom behavior.
+func WithNoExtensions() Option {
+	return func(p *Markdown) {
+		p.extensions = NoExtensions
+		p.renderer = NewHTMLRenderer(HTMLRendererParameters{
+			Flags: HTMLFlagsNone,
+		})
+	}
+}
+
+// WithRefOverride sets an optional function callback that is called every
+// time a reference is resolved.
+//
+// In Markdown, the link reference syntax can be made to resolve a link to
+// a reference instead of an inline URL, in one of the following ways:
+//
+//  * [link text][refid]
+//  * [refid][]
+//
+// Usually, the refid is defined at the bottom of the Markdown document. If
+// this override function is provided, the refid is passed to the override
+// function first, before consulting the defined refids at the bottom. If
+// the override function indicates an override did not occur, the refids at
+// the bottom will be used to fill in the link details.
+func WithRefOverride(o ReferenceOverrideFunc) Option {
+	return func(p *Markdown) {
+		p.referenceOverride = o
+	}
+}
+
+// Run is the main entry point to Blackfriday. It parses and renders a
+// block of markdown-encoded text.
+//
+// The simplest invocation of Run takes one argument, input:
+//     output := Run(input)
+// This will parse the input with CommonExtensions enabled and render it with
+// the default HTMLRenderer (with CommonHTMLFlags).
+//
+// Variadic arguments opts can customize the default behavior. Since Markdown
+// type does not contain exported fields, you can not use it directly. Instead,
+// use the With* functions. For example, this will call the most basic
+// functionality, with no extensions:
+//     output := Run(input, WithNoExtensions())
+//
+// You can use any number of With* arguments, even contradicting ones. They
+// will be applied in order of appearance and the latter will override the
+// former:
+//     output := Run(input, WithNoExtensions(), WithExtensions(exts),
+//         WithRenderer(yourRenderer))
+func Run(input []byte, opts ...Option) []byte {
+	r := NewHTMLRenderer(HTMLRendererParameters{
+		Flags: CommonHTMLFlags,
+	})
+	optList := []Option{WithRenderer(r), WithExtensions(CommonExtensions)}
+	optList = append(optList, opts...)
+	parser := New(optList...)
+	ast := parser.Parse(input)
+	var buf bytes.Buffer
+	parser.renderer.RenderHeader(&buf, ast)
+	ast.Walk(func(node *Node, entering bool) WalkStatus {
+		return parser.renderer.RenderNode(&buf, node, entering)
+	})
+	parser.renderer.RenderFooter(&buf, ast)
+	return buf.Bytes()
+}
+
+// Parse is an entry point to the parsing part of Blackfriday. It takes an
+// input markdown document and produces a syntax tree for its contents. This
+// tree can then be rendered with a default or custom renderer, or
+// analyzed/transformed by the caller to whatever non-standard needs they have.
+// The return value is the root node of the syntax tree.
+func (p *Markdown) Parse(input []byte) *Node {
+	p.block(input)
+	// Walk the tree and finish up some of unfinished blocks
+	for p.tip != nil {
+		p.finalize(p.tip)
+	}
+	// Walk the tree again and process inline markdown in each block
+	p.doc.Walk(func(node *Node, entering bool) WalkStatus {
+		if node.Type == Paragraph || node.Type == Heading || node.Type == TableCell {
+			p.inline(node, node.content)
+			node.content = nil
+		}
+		return GoToNext
+	})
+	p.parseRefsToAST()
+	return p.doc
+}
+
+func (p *Markdown) parseRefsToAST() {
+	if p.extensions&Footnotes == 0 || len(p.notes) == 0 {
+		return
+	}
+	p.tip = p.doc
+	block := p.addBlock(List, nil)
+	block.IsFootnotesList = true
+	block.ListFlags = ListTypeOrdered
+	flags := ListItemBeginningOfList
+	// Note: this loop is intentionally explicit, not range-form. This is
+	// because the body of the loop will append nested footnotes to p.notes and
+	// we need to process those late additions. Range form would only walk over
+	// the fixed initial set.
+	for i := 0; i < len(p.notes); i++ {
+		ref := p.notes[i]
+		p.addExistingChild(ref.footnote, 0)
+		block := ref.footnote
+		block.ListFlags = flags | ListTypeOrdered
+		block.RefLink = ref.link
+		if ref.hasBlock {
+			flags |= ListItemContainsBlock
+			p.block(ref.title)
+		} else {
+			p.inline(block, ref.title)
+		}
+		flags &^= ListItemBeginningOfList | ListItemContainsBlock
+	}
+	above := block.Parent
+	finalizeList(block)
+	p.tip = above
+	block.Walk(func(node *Node, entering bool) WalkStatus {
+		if node.Type == Paragraph || node.Type == Heading {
+			p.inline(node, node.content)
+			node.content = nil
+		}
+		return GoToNext
+	})
+}
+
+//
+// Link references
+//
+// This section implements support for references that (usually) appear
+// as footnotes in a document, and can be referenced anywhere in the document.
+// The basic format is:
+//
+//    [1]: http://www.google.com/ "Google"
+//    [2]: http://www.github.com/ "Github"
+//
+// Anywhere in the document, the reference can be linked by referring to its
+// label, i.e., 1 and 2 in this example, as in:
+//
+//    This library is hosted on [Github][2], a git hosting site.
+//
+// Actual footnotes as specified in Pandoc and supported by some other Markdown
+// libraries such as php-markdown are also taken care of. They look like this:
+//
+//    This sentence needs a bit of further explanation.[^note]
+//
+//    [^note]: This is the explanation.
+//
+// Footnotes should be placed at the end of the document in an ordered list.
+// Finally, there are inline footnotes such as:
+//
+//    Inline footnotes^[Also supported.] provide a quick inline explanation,
+//    but are rendered at the bottom of the document.
+//
+
+// reference holds all information necessary for a reference-style links or
+// footnotes.
+//
+// Consider this markdown with reference-style links:
+//
+//     [link][ref]
+//
+//     [ref]: /url/ "tooltip title"
+//
+// It will be ultimately converted to this HTML:
+//
+//     <p><a href=\"/url/\" title=\"title\">link</a></p>
+//
+// And a reference structure will be populated as follows:
+//
+//     p.refs["ref"] = &reference{
+//         link: "/url/",
+//         title: "tooltip title",
+//     }
+//
+// Alternatively, reference can contain information about a footnote. Consider
+// this markdown:
+//
+//     Text needing a footnote.[^a]
+//
+//     [^a]: This is the note
+//
+// A reference structure will be populated as follows:
+//
+//     p.refs["a"] = &reference{
+//         link: "a",
+//         title: "This is the note",
+//         noteID: <some positive int>,
+//     }
+//
+// TODO: As you can see, it begs for splitting into two dedicated structures
+// for refs and for footnotes.
+type reference struct {
+	link     []byte
+	title    []byte
+	noteID   int // 0 if not a footnote ref
+	hasBlock bool
+	footnote *Node // a link to the Item node within a list of footnotes
+
+	text []byte // only gets populated by refOverride feature with Reference.Text
+}
+
+func (r *reference) String() string {
+	return fmt.Sprintf("{link: %q, title: %q, text: %q, noteID: %d, hasBlock: %v}",
+		r.link, r.title, r.text, r.noteID, r.hasBlock)
+}
+
+// Check whether or not data starts with a reference link.
+// If so, it is parsed and stored in the list of references
+// (in the render struct).
+// Returns the number of bytes to skip to move past it,
+// or zero if the first line is not a reference.
+func isReference(p *Markdown, data []byte, tabSize int) int {
+	// up to 3 optional leading spaces
+	if len(data) < 4 {
+		return 0
+	}
+	i := 0
+	for i < 3 && data[i] == ' ' {
+		i++
+	}
+
+	noteID := 0
+
+	// id part: anything but a newline between brackets
+	if data[i] != '[' {
+		return 0
+	}
+	i++
+	if p.extensions&Footnotes != 0 {
+		if i < len(data) && data[i] == '^' {
+			// we can set it to anything here because the proper noteIds will
+			// be assigned later during the second pass. It just has to be != 0
+			noteID = 1
+			i++
+		}
+	}
+	idOffset := i
+	for i < len(data) && data[i] != '\n' && data[i] != '\r' && data[i] != ']' {
+		i++
+	}
+	if i >= len(data) || data[i] != ']' {
+		return 0
+	}
+	idEnd := i
+	// footnotes can have empty ID, like this: [^], but a reference can not be
+	// empty like this: []. Break early if it's not a footnote and there's no ID
+	if noteID == 0 && idOffset == idEnd {
+		return 0
+	}
+	// spacer: colon (space | tab)* newline? (space | tab)*
+	i++
+	if i >= len(data) || data[i] != ':' {
+		return 0
+	}
+	i++
+	for i < len(data) && (data[i] == ' ' || data[i] == '\t') {
+		i++
+	}
+	if i < len(data) && (data[i] == '\n' || data[i] == '\r') {
+		i++
+		if i < len(data) && data[i] == '\n' && data[i-1] == '\r' {
+			i++
+		}
+	}
+	for i < len(data) && (data[i] == ' ' || data[i] == '\t') {
+		i++
+	}
+	if i >= len(data) {
+		return 0
+	}
+
+	var (
+		linkOffset, linkEnd   int
+		titleOffset, titleEnd int
+		lineEnd               int
+		raw                   []byte
+		hasBlock              bool
+	)
+
+	if p.extensions&Footnotes != 0 && noteID != 0 {
+		linkOffset, linkEnd, raw, hasBlock = scanFootnote(p, data, i, tabSize)
+		lineEnd = linkEnd
+	} else {
+		linkOffset, linkEnd, titleOffset, titleEnd, lineEnd = scanLinkRef(p, data, i)
+	}
+	if lineEnd == 0 {
+		return 0
+	}
+
+	// a valid ref has been found
+
+	ref := &reference{
+		noteID:   noteID,
+		hasBlock: hasBlock,
+	}
+
+	if noteID > 0 {
+		// reusing the link field for the id since footnotes don't have links
+		ref.link = data[idOffset:idEnd]
+		// if footnote, it's not really a title, it's the contained text
+		ref.title = raw
+	} else {
+		ref.link = data[linkOffset:linkEnd]
+		ref.title = data[titleOffset:titleEnd]
+	}
+
+	// id matches are case-insensitive
+	id := string(bytes.ToLower(data[idOffset:idEnd]))
+
+	p.refs[id] = ref
+
+	return lineEnd
+}
+
+func scanLinkRef(p *Markdown, data []byte, i int) (linkOffset, linkEnd, titleOffset, titleEnd, lineEnd int) {
+	// link: whitespace-free sequence, optionally between angle brackets
+	if data[i] == '<' {
+		i++
+	}
+	linkOffset = i
+	for i < len(data) && data[i] != ' ' && data[i] != '\t' && data[i] != '\n' && data[i] != '\r' {
+		i++
+	}
+	linkEnd = i
+	if data[linkOffset] == '<' && data[linkEnd-1] == '>' {
+		linkOffset++
+		linkEnd--
+	}
+
+	// optional spacer: (space | tab)* (newline | '\'' | '"' | '(' )
+	for i < len(data) && (data[i] == ' ' || data[i] == '\t') {
+		i++
+	}
+	if i < len(data) && data[i] != '\n' && data[i] != '\r' && data[i] != '\'' && data[i] != '"' && data[i] != '(' {
+		return
+	}
+
+	// compute end-of-line
+	if i >= len(data) || data[i] == '\r' || data[i] == '\n' {
+		lineEnd = i
+	}
+	if i+1 < len(data) && data[i] == '\r' && data[i+1] == '\n' {
+		lineEnd++
+	}
+
+	// optional (space|tab)* spacer after a newline
+	if lineEnd > 0 {
+		i = lineEnd + 1
+		for i < len(data) && (data[i] == ' ' || data[i] == '\t') {
+			i++
+		}
+	}
+
+	// optional title: any non-newline sequence enclosed in '"() alone on its line
+	if i+1 < len(data) && (data[i] == '\'' || data[i] == '"' || data[i] == '(') {
+		i++
+		titleOffset = i
+
+		// look for EOL
+		for i < len(data) && data[i] != '\n' && data[i] != '\r' {
+			i++
+		}
+		if i+1 < len(data) && data[i] == '\n' && data[i+1] == '\r' {
+			titleEnd = i + 1
+		} else {
+			titleEnd = i
+		}
+
+		// step back
+		i--
+		for i > titleOffset && (data[i] == ' ' || data[i] == '\t') {
+			i--
+		}
+		if i > titleOffset && (data[i] == '\'' || data[i] == '"' || data[i] == ')') {
+			lineEnd = titleEnd
+			titleEnd = i
+		}
+	}
+
+	return
+}
+
+// The first bit of this logic is the same as Parser.listItem, but the rest
+// is much simpler. This function simply finds the entire block and shifts it
+// over by one tab if it is indeed a block (just returns the line if it's not).
+// blockEnd is the end of the section in the input buffer, and contents is the
+// extracted text that was shifted over one tab. It will need to be rendered at
+// the end of the document.
+func scanFootnote(p *Markdown, data []byte, i, indentSize int) (blockStart, blockEnd int, contents []byte, hasBlock bool) {
+	if i == 0 || len(data) == 0 {
+		return
+	}
+
+	// skip leading whitespace on first line
+	for i < len(data) && data[i] == ' ' {
+		i++
+	}
+
+	blockStart = i
+
+	// find the end of the line
+	blockEnd = i
+	for i < len(data) && data[i-1] != '\n' {
+		i++
+	}
+
+	// get working buffer
+	var raw bytes.Buffer
+
+	// put the first line into the working buffer
+	raw.Write(data[blockEnd:i])
+	blockEnd = i
+
+	// process the following lines
+	containsBlankLine := false
+
+gatherLines:
+	for blockEnd < len(data) {
+		i++
+
+		// find the end of this line
+		for i < len(data) && data[i-1] != '\n' {
+			i++
+		}
+
+		// if it is an empty line, guess that it is part of this item
+		// and move on to the next line
+		if p.isEmpty(data[blockEnd:i]) > 0 {
+			containsBlankLine = true
+			blockEnd = i
+			continue
+		}
+
+		n := 0
+		if n = isIndented(data[blockEnd:i], indentSize); n == 0 {
+			// this is the end of the block.
+			// we don't want to include this last line in the index.
+			break gatherLines
+		}
+
+		// if there were blank lines before this one, insert a new one now
+		if containsBlankLine {
+			raw.WriteByte('\n')
+			containsBlankLine = false
+		}
+
+		// get rid of that first tab, write to buffer
+		raw.Write(data[blockEnd+n : i])
+		hasBlock = true
+
+		blockEnd = i
+	}
+
+	if data[blockEnd-1] != '\n' {
+		raw.WriteByte('\n')
+	}
+
+	contents = raw.Bytes()
+
+	return
+}
+
+//
+//
+// Miscellaneous helper functions
+//
+//
+
+// Test if a character is a punctuation symbol.
+// Taken from a private function in regexp in the stdlib.
+func ispunct(c byte) bool {
+	for _, r := range []byte("!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~") {
+		if c == r {
+			return true
+		}
+	}
+	return false
+}
+
+// Test if a character is a whitespace character.
+func isspace(c byte) bool {
+	return ishorizontalspace(c) || isverticalspace(c)
+}
+
+// Test if a character is a horizontal whitespace character.
+func ishorizontalspace(c byte) bool {
+	return c == ' ' || c == '\t'
+}
+
+// Test if a character is a vertical character.
+func isverticalspace(c byte) bool {
+	return c == '\n' || c == '\r' || c == '\f' || c == '\v'
+}
+
+// Test if a character is letter.
+func isletter(c byte) bool {
+	return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
+}
+
+// Test if a character is a letter or a digit.
+// TODO: check when this is looking for ASCII alnum and when it should use unicode
+func isalnum(c byte) bool {
+	return (c >= '0' && c <= '9') || isletter(c)
+}
+
+// Replace tab characters with spaces, aligning to the next TAB_SIZE column.
+// always ends output with a newline
+func expandTabs(out *bytes.Buffer, line []byte, tabSize int) {
+	// first, check for common cases: no tabs, or only tabs at beginning of line
+	i, prefix := 0, 0
+	slowcase := false
+	for i = 0; i < len(line); i++ {
+		if line[i] == '\t' {
+			if prefix == i {
+				prefix++
+			} else {
+				slowcase = true
+				break
+			}
+		}
+	}
+
+	// no need to decode runes if all tabs are at the beginning of the line
+	if !slowcase {
+		for i = 0; i < prefix*tabSize; i++ {
+			out.WriteByte(' ')
+		}
+		out.Write(line[prefix:])
+		return
+	}
+
+	// the slow case: we need to count runes to figure out how
+	// many spaces to insert for each tab
+	column := 0
+	i = 0
+	for i < len(line) {
+		start := i
+		for i < len(line) && line[i] != '\t' {
+			_, size := utf8.DecodeRune(line[i:])
+			i += size
+			column++
+		}
+
+		if i > start {
+			out.Write(line[start:i])
+		}
+
+		if i >= len(line) {
+			break
+		}
+
+		for {
+			out.WriteByte(' ')
+			column++
+			if column%tabSize == 0 {
+				break
+			}
+		}
+
+		i++
+	}
+}
+
+// Find if a line counts as indented or not.
+// Returns number of characters the indent is (0 = not indented).
+func isIndented(data []byte, indentSize int) int {
+	if len(data) == 0 {
+		return 0
+	}
+	if data[0] == '\t' {
+		return 1
+	}
+	if len(data) < indentSize {
+		return 0
+	}
+	for i := 0; i < indentSize; i++ {
+		if data[i] != ' ' {
+			return 0
+		}
+	}
+	return indentSize
+}
+
+// Create a url-safe slug for fragments
+func slugify(in []byte) []byte {
+	if len(in) == 0 {
+		return in
+	}
+	out := make([]byte, 0, len(in))
+	sym := false
+
+	for _, ch := range in {
+		if isalnum(ch) {
+			sym = false
+			out = append(out, ch)
+		} else if sym {
+			continue
+		} else {
+			out = append(out, '-')
+			sym = true
+		}
+	}
+	var a, b int
+	var ch byte
+	for a, ch = range out {
+		if ch != '-' {
+			break
+		}
+	}
+	for b = len(out) - 1; b > 0; b-- {
+		if out[b] != '-' {
+			break
+		}
+	}
+	return out[a : b+1]
+}
diff --git a/vendor/github.com/russross/blackfriday/v2/node.go b/vendor/github.com/russross/blackfriday/v2/node.go
new file mode 100644
index 00000000..51b9e8c1
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/node.go
@@ -0,0 +1,354 @@
+package blackfriday
+
+import (
+	"bytes"
+	"fmt"
+)
+
+// NodeType specifies a type of a single node of a syntax tree. Usually one
+// node (and its type) corresponds to a single markdown feature, e.g. emphasis
+// or code block.
+type NodeType int
+
+// Constants for identifying different types of nodes. See NodeType.
+const (
+	Document NodeType = iota
+	BlockQuote
+	List
+	Item
+	Paragraph
+	Heading
+	HorizontalRule
+	Emph
+	Strong
+	Del
+	Link
+	Image
+	Text
+	HTMLBlock
+	CodeBlock
+	Softbreak
+	Hardbreak
+	Code
+	HTMLSpan
+	Table
+	TableCell
+	TableHead
+	TableBody
+	TableRow
+)
+
+var nodeTypeNames = []string{
+	Document:       "Document",
+	BlockQuote:     "BlockQuote",
+	List:           "List",
+	Item:           "Item",
+	Paragraph:      "Paragraph",
+	Heading:        "Heading",
+	HorizontalRule: "HorizontalRule",
+	Emph:           "Emph",
+	Strong:         "Strong",
+	Del:            "Del",
+	Link:           "Link",
+	Image:          "Image",
+	Text:           "Text",
+	HTMLBlock:      "HTMLBlock",
+	CodeBlock:      "CodeBlock",
+	Softbreak:      "Softbreak",
+	Hardbreak:      "Hardbreak",
+	Code:           "Code",
+	HTMLSpan:       "HTMLSpan",
+	Table:          "Table",
+	TableCell:      "TableCell",
+	TableHead:      "TableHead",
+	TableBody:      "TableBody",
+	TableRow:       "TableRow",
+}
+
+func (t NodeType) String() string {
+	return nodeTypeNames[t]
+}
+
+// ListData contains fields relevant to a List and Item node type.
+type ListData struct {
+	ListFlags       ListType
+	Tight           bool   // Skip <p>s around list item data if true
+	BulletChar      byte   // '*', '+' or '-' in bullet lists
+	Delimiter       byte   // '.' or ')' after the number in ordered lists
+	RefLink         []byte // If not nil, turns this list item into a footnote item and triggers different rendering
+	IsFootnotesList bool   // This is a list of footnotes
+}
+
+// LinkData contains fields relevant to a Link node type.
+type LinkData struct {
+	Destination []byte // Destination is what goes into a href
+	Title       []byte // Title is the tooltip thing that goes in a title attribute
+	NoteID      int    // NoteID contains a serial number of a footnote, zero if it's not a footnote
+	Footnote    *Node  // If it's a footnote, this is a direct link to the footnote Node. Otherwise nil.
+}
+
+// CodeBlockData contains fields relevant to a CodeBlock node type.
+type CodeBlockData struct {
+	IsFenced    bool   // Specifies whether it's a fenced code block or an indented one
+	Info        []byte // This holds the info string
+	FenceChar   byte
+	FenceLength int
+	FenceOffset int
+}
+
+// TableCellData contains fields relevant to a TableCell node type.
+type TableCellData struct {
+	IsHeader bool           // This tells if it's under the header row
+	Align    CellAlignFlags // This holds the value for align attribute
+}
+
+// HeadingData contains fields relevant to a Heading node type.
+type HeadingData struct {
+	Level        int    // This holds the heading level number
+	HeadingID    string // This might hold heading ID, if present
+	IsTitleblock bool   // Specifies whether it's a title block
+}
+
+// Node is a single element in the abstract syntax tree of the parsed document.
+// It holds connections to the structurally neighboring nodes and, for certain
+// types of nodes, additional information that might be needed when rendering.
+type Node struct {
+	Type       NodeType // Determines the type of the node
+	Parent     *Node    // Points to the parent
+	FirstChild *Node    // Points to the first child, if any
+	LastChild  *Node    // Points to the last child, if any
+	Prev       *Node    // Previous sibling; nil if it's the first child
+	Next       *Node    // Next sibling; nil if it's the last child
+
+	Literal []byte // Text contents of the leaf nodes
+
+	HeadingData   // Populated if Type is Heading
+	ListData      // Populated if Type is List
+	CodeBlockData // Populated if Type is CodeBlock
+	LinkData      // Populated if Type is Link
+	TableCellData // Populated if Type is TableCell
+
+	content []byte // Markdown content of the block nodes
+	open    bool   // Specifies an open block node that has not been finished to process yet
+}
+
+// NewNode allocates a node of a specified type.
+func NewNode(typ NodeType) *Node {
+	return &Node{
+		Type: typ,
+		open: true,
+	}
+}
+
+func (n *Node) String() string {
+	ellipsis := ""
+	snippet := n.Literal
+	if len(snippet) > 16 {
+		snippet = snippet[:16]
+		ellipsis = "..."
+	}
+	return fmt.Sprintf("%s: '%s%s'", n.Type, snippet, ellipsis)
+}
+
+// Unlink removes node 'n' from the tree.
+// It panics if the node is nil.
+func (n *Node) Unlink() {
+	if n.Prev != nil {
+		n.Prev.Next = n.Next
+	} else if n.Parent != nil {
+		n.Parent.FirstChild = n.Next
+	}
+	if n.Next != nil {
+		n.Next.Prev = n.Prev
+	} else if n.Parent != nil {
+		n.Parent.LastChild = n.Prev
+	}
+	n.Parent = nil
+	n.Next = nil
+	n.Prev = nil
+}
+
+// AppendChild adds a node 'child' as a child of 'n'.
+// It panics if either node is nil.
+func (n *Node) AppendChild(child *Node) {
+	child.Unlink()
+	child.Parent = n
+	if n.LastChild != nil {
+		n.LastChild.Next = child
+		child.Prev = n.LastChild
+		n.LastChild = child
+	} else {
+		n.FirstChild = child
+		n.LastChild = child
+	}
+}
+
+// InsertBefore inserts 'sibling' immediately before 'n'.
+// It panics if either node is nil.
+func (n *Node) InsertBefore(sibling *Node) {
+	sibling.Unlink()
+	sibling.Prev = n.Prev
+	if sibling.Prev != nil {
+		sibling.Prev.Next = sibling
+	}
+	sibling.Next = n
+	n.Prev = sibling
+	sibling.Parent = n.Parent
+	if sibling.Prev == nil {
+		sibling.Parent.FirstChild = sibling
+	}
+}
+
+func (n *Node) isContainer() bool {
+	switch n.Type {
+	case Document:
+		fallthrough
+	case BlockQuote:
+		fallthrough
+	case List:
+		fallthrough
+	case Item:
+		fallthrough
+	case Paragraph:
+		fallthrough
+	case Heading:
+		fallthrough
+	case Emph:
+		fallthrough
+	case Strong:
+		fallthrough
+	case Del:
+		fallthrough
+	case Link:
+		fallthrough
+	case Image:
+		fallthrough
+	case Table:
+		fallthrough
+	case TableHead:
+		fallthrough
+	case TableBody:
+		fallthrough
+	case TableRow:
+		fallthrough
+	case TableCell:
+		return true
+	default:
+		return false
+	}
+}
+
+func (n *Node) canContain(t NodeType) bool {
+	if n.Type == List {
+		return t == Item
+	}
+	if n.Type == Document || n.Type == BlockQuote || n.Type == Item {
+		return t != Item
+	}
+	if n.Type == Table {
+		return t == TableHead || t == TableBody
+	}
+	if n.Type == TableHead || n.Type == TableBody {
+		return t == TableRow
+	}
+	if n.Type == TableRow {
+		return t == TableCell
+	}
+	return false
+}
+
+// WalkStatus allows NodeVisitor to have some control over the tree traversal.
+// It is returned from NodeVisitor and different values allow Node.Walk to
+// decide which node to go to next.
+type WalkStatus int
+
+const (
+	// GoToNext is the default traversal of every node.
+	GoToNext WalkStatus = iota
+	// SkipChildren tells walker to skip all children of current node.
+	SkipChildren
+	// Terminate tells walker to terminate the traversal.
+	Terminate
+)
+
+// NodeVisitor is a callback to be called when traversing the syntax tree.
+// Called twice for every node: once with entering=true when the branch is
+// first visited, then with entering=false after all the children are done.
+type NodeVisitor func(node *Node, entering bool) WalkStatus
+
+// Walk is a convenience method that instantiates a walker and starts a
+// traversal of subtree rooted at n.
+func (n *Node) Walk(visitor NodeVisitor) {
+	w := newNodeWalker(n)
+	for w.current != nil {
+		status := visitor(w.current, w.entering)
+		switch status {
+		case GoToNext:
+			w.next()
+		case SkipChildren:
+			w.entering = false
+			w.next()
+		case Terminate:
+			return
+		}
+	}
+}
+
+type nodeWalker struct {
+	current  *Node
+	root     *Node
+	entering bool
+}
+
+func newNodeWalker(root *Node) *nodeWalker {
+	return &nodeWalker{
+		current:  root,
+		root:     root,
+		entering: true,
+	}
+}
+
+func (nw *nodeWalker) next() {
+	if (!nw.current.isContainer() || !nw.entering) && nw.current == nw.root {
+		nw.current = nil
+		return
+	}
+	if nw.entering && nw.current.isContainer() {
+		if nw.current.FirstChild != nil {
+			nw.current = nw.current.FirstChild
+			nw.entering = true
+		} else {
+			nw.entering = false
+		}
+	} else if nw.current.Next == nil {
+		nw.current = nw.current.Parent
+		nw.entering = false
+	} else {
+		nw.current = nw.current.Next
+		nw.entering = true
+	}
+}
+
+func dump(ast *Node) {
+	fmt.Println(dumpString(ast))
+}
+
+func dumpR(ast *Node, depth int) string {
+	if ast == nil {
+		return ""
+	}
+	indent := bytes.Repeat([]byte("\t"), depth)
+	content := ast.Literal
+	if content == nil {
+		content = ast.content
+	}
+	result := fmt.Sprintf("%s%s(%q)\n", indent, ast.Type, content)
+	for n := ast.FirstChild; n != nil; n = n.Next {
+		result += dumpR(n, depth+1)
+	}
+	return result
+}
+
+func dumpString(ast *Node) string {
+	return dumpR(ast, 0)
+}
diff --git a/vendor/github.com/russross/blackfriday/v2/smartypants.go b/vendor/github.com/russross/blackfriday/v2/smartypants.go
new file mode 100644
index 00000000..3a220e94
--- /dev/null
+++ b/vendor/github.com/russross/blackfriday/v2/smartypants.go
@@ -0,0 +1,457 @@
+//
+// Blackfriday Markdown Processor
+// Available at http://github.com/russross/blackfriday
+//
+// Copyright © 2011 Russ Ross <russ@russross.com>.
+// Distributed under the Simplified BSD License.
+// See README.md for details.
+//
+
+//
+//
+// SmartyPants rendering
+//
+//
+
+package blackfriday
+
+import (
+	"bytes"
+	"io"
+)
+
+// SPRenderer is a struct containing state of a Smartypants renderer.
+type SPRenderer struct {
+	inSingleQuote bool
+	inDoubleQuote bool
+	callbacks     [256]smartCallback
+}
+
+func wordBoundary(c byte) bool {
+	return c == 0 || isspace(c) || ispunct(c)
+}
+
+func tolower(c byte) byte {
+	if c >= 'A' && c <= 'Z' {
+		return c - 'A' + 'a'
+	}
+	return c
+}
+
+func isdigit(c byte) bool {
+	return c >= '0' && c <= '9'
+}
+
+func smartQuoteHelper(out *bytes.Buffer, previousChar byte, nextChar byte, quote byte, isOpen *bool, addNBSP bool) bool {
+	// edge of the buffer is likely to be a tag that we don't get to see,
+	// so we treat it like text sometimes
+
+	// enumerate all sixteen possibilities for (previousChar, nextChar)
+	// each can be one of {0, space, punct, other}
+	switch {
+	case previousChar == 0 && nextChar == 0:
+		// context is not any help here, so toggle
+		*isOpen = !*isOpen
+	case isspace(previousChar) && nextChar == 0:
+		// [ "] might be [ "<code>foo...]
+		*isOpen = true
+	case ispunct(previousChar) && nextChar == 0:
+		// [!"] hmm... could be [Run!"] or [("<code>...]
+		*isOpen = false
+	case /* isnormal(previousChar) && */ nextChar == 0:
+		// [a"] is probably a close
+		*isOpen = false
+	case previousChar == 0 && isspace(nextChar):
+		// [" ] might be [...foo</code>" ]
+		*isOpen = false
+	case isspace(previousChar) && isspace(nextChar):
+		// [ " ] context is not any help here, so toggle
+		*isOpen = !*isOpen
+	case ispunct(previousChar) && isspace(nextChar):
+		// [!" ] is probably a close
+		*isOpen = false
+	case /* isnormal(previousChar) && */ isspace(nextChar):
+		// [a" ] this is one of the easy cases
+		*isOpen = false
+	case previousChar == 0 && ispunct(nextChar):
+		// ["!] hmm... could be ["$1.95] or [</code>"!...]
+		*isOpen = false
+	case isspace(previousChar) && ispunct(nextChar):
+		// [ "!] looks more like [ "$1.95]
+		*isOpen = true
+	case ispunct(previousChar) && ispunct(nextChar):
+		// [!"!] context is not any help here, so toggle
+		*isOpen = !*isOpen
+	case /* isnormal(previousChar) && */ ispunct(nextChar):
+		// [a"!] is probably a close
+		*isOpen = false
+	case previousChar == 0 /* && isnormal(nextChar) */ :
+		// ["a] is probably an open
+		*isOpen = true
+	case isspace(previousChar) /* && isnormal(nextChar) */ :
+		// [ "a] this is one of the easy cases
+		*isOpen = true
+	case ispunct(previousChar) /* && isnormal(nextChar) */ :
+		// [!"a] is probably an open
+		*isOpen = true
+	default:
+		// [a'b] maybe a contraction?
+		*isOpen = false
+	}
+
+	// Note that with the limited lookahead, this non-breaking
+	// space will also be appended to single double quotes.
+	if addNBSP && !*isOpen {
+		out.WriteString("&nbsp;")
+	}
+
+	out.WriteByte('&')
+	if *isOpen {
+		out.WriteByte('l')
+	} else {
+		out.WriteByte('r')
+	}
+	out.WriteByte(quote)
+	out.WriteString("quo;")
+
+	if addNBSP && *isOpen {
+		out.WriteString("&nbsp;")
+	}
+
+	return true
+}
+
+func (r *SPRenderer) smartSingleQuote(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 2 {
+		t1 := tolower(text[1])
+
+		if t1 == '\'' {
+			nextChar := byte(0)
+			if len(text) >= 3 {
+				nextChar = text[2]
+			}
+			if smartQuoteHelper(out, previousChar, nextChar, 'd', &r.inDoubleQuote, false) {
+				return 1
+			}
+		}
+
+		if (t1 == 's' || t1 == 't' || t1 == 'm' || t1 == 'd') && (len(text) < 3 || wordBoundary(text[2])) {
+			out.WriteString("&rsquo;")
+			return 0
+		}
+
+		if len(text) >= 3 {
+			t2 := tolower(text[2])
+
+			if ((t1 == 'r' && t2 == 'e') || (t1 == 'l' && t2 == 'l') || (t1 == 'v' && t2 == 'e')) &&
+				(len(text) < 4 || wordBoundary(text[3])) {
+				out.WriteString("&rsquo;")
+				return 0
+			}
+		}
+	}
+
+	nextChar := byte(0)
+	if len(text) > 1 {
+		nextChar = text[1]
+	}
+	if smartQuoteHelper(out, previousChar, nextChar, 's', &r.inSingleQuote, false) {
+		return 0
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartParens(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 3 {
+		t1 := tolower(text[1])
+		t2 := tolower(text[2])
+
+		if t1 == 'c' && t2 == ')' {
+			out.WriteString("&copy;")
+			return 2
+		}
+
+		if t1 == 'r' && t2 == ')' {
+			out.WriteString("&reg;")
+			return 2
+		}
+
+		if len(text) >= 4 && t1 == 't' && t2 == 'm' && text[3] == ')' {
+			out.WriteString("&trade;")
+			return 3
+		}
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartDash(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 2 {
+		if text[1] == '-' {
+			out.WriteString("&mdash;")
+			return 1
+		}
+
+		if wordBoundary(previousChar) && wordBoundary(text[1]) {
+			out.WriteString("&ndash;")
+			return 0
+		}
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartDashLatex(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 3 && text[1] == '-' && text[2] == '-' {
+		out.WriteString("&mdash;")
+		return 2
+	}
+	if len(text) >= 2 && text[1] == '-' {
+		out.WriteString("&ndash;")
+		return 1
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartAmpVariant(out *bytes.Buffer, previousChar byte, text []byte, quote byte, addNBSP bool) int {
+	if bytes.HasPrefix(text, []byte("&quot;")) {
+		nextChar := byte(0)
+		if len(text) >= 7 {
+			nextChar = text[6]
+		}
+		if smartQuoteHelper(out, previousChar, nextChar, quote, &r.inDoubleQuote, addNBSP) {
+			return 5
+		}
+	}
+
+	if bytes.HasPrefix(text, []byte("&#0;")) {
+		return 3
+	}
+
+	out.WriteByte('&')
+	return 0
+}
+
+func (r *SPRenderer) smartAmp(angledQuotes, addNBSP bool) func(*bytes.Buffer, byte, []byte) int {
+	var quote byte = 'd'
+	if angledQuotes {
+		quote = 'a'
+	}
+
+	return func(out *bytes.Buffer, previousChar byte, text []byte) int {
+		return r.smartAmpVariant(out, previousChar, text, quote, addNBSP)
+	}
+}
+
+func (r *SPRenderer) smartPeriod(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 3 && text[1] == '.' && text[2] == '.' {
+		out.WriteString("&hellip;")
+		return 2
+	}
+
+	if len(text) >= 5 && text[1] == ' ' && text[2] == '.' && text[3] == ' ' && text[4] == '.' {
+		out.WriteString("&hellip;")
+		return 4
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartBacktick(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if len(text) >= 2 && text[1] == '`' {
+		nextChar := byte(0)
+		if len(text) >= 3 {
+			nextChar = text[2]
+		}
+		if smartQuoteHelper(out, previousChar, nextChar, 'd', &r.inDoubleQuote, false) {
+			return 1
+		}
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartNumberGeneric(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if wordBoundary(previousChar) && previousChar != '/' && len(text) >= 3 {
+		// is it of the form digits/digits(word boundary)?, i.e., \d+/\d+\b
+		// note: check for regular slash (/) or fraction slash (⁄, 0x2044, or 0xe2 81 84 in utf-8)
+		//       and avoid changing dates like 1/23/2005 into fractions.
+		numEnd := 0
+		for len(text) > numEnd && isdigit(text[numEnd]) {
+			numEnd++
+		}
+		if numEnd == 0 {
+			out.WriteByte(text[0])
+			return 0
+		}
+		denStart := numEnd + 1
+		if len(text) > numEnd+3 && text[numEnd] == 0xe2 && text[numEnd+1] == 0x81 && text[numEnd+2] == 0x84 {
+			denStart = numEnd + 3
+		} else if len(text) < numEnd+2 || text[numEnd] != '/' {
+			out.WriteByte(text[0])
+			return 0
+		}
+		denEnd := denStart
+		for len(text) > denEnd && isdigit(text[denEnd]) {
+			denEnd++
+		}
+		if denEnd == denStart {
+			out.WriteByte(text[0])
+			return 0
+		}
+		if len(text) == denEnd || wordBoundary(text[denEnd]) && text[denEnd] != '/' {
+			out.WriteString("<sup>")
+			out.Write(text[:numEnd])
+			out.WriteString("</sup>&frasl;<sub>")
+			out.Write(text[denStart:denEnd])
+			out.WriteString("</sub>")
+			return denEnd - 1
+		}
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartNumber(out *bytes.Buffer, previousChar byte, text []byte) int {
+	if wordBoundary(previousChar) && previousChar != '/' && len(text) >= 3 {
+		if text[0] == '1' && text[1] == '/' && text[2] == '2' {
+			if len(text) < 4 || wordBoundary(text[3]) && text[3] != '/' {
+				out.WriteString("&frac12;")
+				return 2
+			}
+		}
+
+		if text[0] == '1' && text[1] == '/' && text[2] == '4' {
+			if len(text) < 4 || wordBoundary(text[3]) && text[3] != '/' || (len(text) >= 5 && tolower(text[3]) == 't' && tolower(text[4]) == 'h') {
+				out.WriteString("&frac14;")
+				return 2
+			}
+		}
+
+		if text[0] == '3' && text[1] == '/' && text[2] == '4' {
+			if len(text) < 4 || wordBoundary(text[3]) && text[3] != '/' || (len(text) >= 6 && tolower(text[3]) == 't' && tolower(text[4]) == 'h' && tolower(text[5]) == 's') {
+				out.WriteString("&frac34;")
+				return 2
+			}
+		}
+	}
+
+	out.WriteByte(text[0])
+	return 0
+}
+
+func (r *SPRenderer) smartDoubleQuoteVariant(out *bytes.Buffer, previousChar byte, text []byte, quote byte) int {
+	nextChar := byte(0)
+	if len(text) > 1 {
+		nextChar = text[1]
+	}
+	if !smartQuoteHelper(out, previousChar, nextChar, quote, &r.inDoubleQuote, false) {
+		out.WriteString("&quot;")
+	}
+
+	return 0
+}
+
+func (r *SPRenderer) smartDoubleQuote(out *bytes.Buffer, previousChar byte, text []byte) int {
+	return r.smartDoubleQuoteVariant(out, previousChar, text, 'd')
+}
+
+func (r *SPRenderer) smartAngledDoubleQuote(out *bytes.Buffer, previousChar byte, text []byte) int {
+	return r.smartDoubleQuoteVariant(out, previousChar, text, 'a')
+}
+
+func (r *SPRenderer) smartLeftAngle(out *bytes.Buffer, previousChar byte, text []byte) int {
+	i := 0
+
+	for i < len(text) && text[i] != '>' {
+		i++
+	}
+
+	out.Write(text[:i+1])
+	return i
+}
+
+type smartCallback func(out *bytes.Buffer, previousChar byte, text []byte) int
+
+// NewSmartypantsRenderer constructs a Smartypants renderer object.
+func NewSmartypantsRenderer(flags HTMLFlags) *SPRenderer {
+	var (
+		r SPRenderer
+
+		smartAmpAngled      = r.smartAmp(true, false)
+		smartAmpAngledNBSP  = r.smartAmp(true, true)
+		smartAmpRegular     = r.smartAmp(false, false)
+		smartAmpRegularNBSP = r.smartAmp(false, true)
+
+		addNBSP = flags&SmartypantsQuotesNBSP != 0
+	)
+
+	if flags&SmartypantsAngledQuotes == 0 {
+		r.callbacks['"'] = r.smartDoubleQuote
+		if !addNBSP {
+			r.callbacks['&'] = smartAmpRegular
+		} else {
+			r.callbacks['&'] = smartAmpRegularNBSP
+		}
+	} else {
+		r.callbacks['"'] = r.smartAngledDoubleQuote
+		if !addNBSP {
+			r.callbacks['&'] = smartAmpAngled
+		} else {
+			r.callbacks['&'] = smartAmpAngledNBSP
+		}
+	}
+	r.callbacks['\''] = r.smartSingleQuote
+	r.callbacks['('] = r.smartParens
+	if flags&SmartypantsDashes != 0 {
+		if flags&SmartypantsLatexDashes == 0 {
+			r.callbacks['-'] = r.smartDash
+		} else {
+			r.callbacks['-'] = r.smartDashLatex
+		}
+	}
+	r.callbacks['.'] = r.smartPeriod
+	if flags&SmartypantsFractions == 0 {
+		r.callbacks['1'] = r.smartNumber
+		r.callbacks['3'] = r.smartNumber
+	} else {
+		for ch := '1'; ch <= '9'; ch++ {
+			r.callbacks[ch] = r.smartNumberGeneric
+		}
+	}
+	r.callbacks['<'] = r.smartLeftAngle
+	r.callbacks['`'] = r.smartBacktick
+	return &r
+}
+
+// Process is the entry point of the Smartypants renderer.
+func (r *SPRenderer) Process(w io.Writer, text []byte) {
+	mark := 0
+	for i := 0; i < len(text); i++ {
+		if action := r.callbacks[text[i]]; action != nil {
+			if i > mark {
+				w.Write(text[mark:i])
+			}
+			previousChar := byte(0)
+			if i > 0 {
+				previousChar = text[i-1]
+			}
+			var tmp bytes.Buffer
+			i += action(&tmp, previousChar, text[i:])
+			w.Write(tmp.Bytes())
+			mark = i + 1
+		}
+	}
+	if mark < len(text) {
+		w.Write(text[mark:])
+	}
+}
diff --git a/vendor/github.com/shurcooL/sanitized_anchor_name/.travis.yml b/vendor/github.com/shurcooL/sanitized_anchor_name/.travis.yml
new file mode 100644
index 00000000..93b1fcdb
--- /dev/null
+++ b/vendor/github.com/shurcooL/sanitized_anchor_name/.travis.yml
@@ -0,0 +1,16 @@
+sudo: false
+language: go
+go:
+  - 1.x
+  - master
+matrix:
+  allow_failures:
+    - go: master
+  fast_finish: true
+install:
+  - # Do nothing. This is needed to prevent default install action "go get -t -v ./..." from happening here (we want it to happen inside script step).
+script:
+  - go get -t -v ./...
+  - diff -u <(echo -n) <(gofmt -d -s .)
+  - go tool vet .
+  - go test -v -race ./...
diff --git a/vendor/github.com/shurcooL/sanitized_anchor_name/LICENSE b/vendor/github.com/shurcooL/sanitized_anchor_name/LICENSE
new file mode 100644
index 00000000..c35c17af
--- /dev/null
+++ b/vendor/github.com/shurcooL/sanitized_anchor_name/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2015 Dmitri Shuralyov
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/github.com/shurcooL/sanitized_anchor_name/README.md b/vendor/github.com/shurcooL/sanitized_anchor_name/README.md
new file mode 100644
index 00000000..670bf0fe
--- /dev/null
+++ b/vendor/github.com/shurcooL/sanitized_anchor_name/README.md
@@ -0,0 +1,36 @@
+sanitized_anchor_name
+=====================
+
+[![Build Status](https://travis-ci.org/shurcooL/sanitized_anchor_name.svg?branch=master)](https://travis-ci.org/shurcooL/sanitized_anchor_name) [![GoDoc](https://godoc.org/github.com/shurcooL/sanitized_anchor_name?status.svg)](https://godoc.org/github.com/shurcooL/sanitized_anchor_name)
+
+Package sanitized_anchor_name provides a func to create sanitized anchor names.
+
+Its logic can be reused by multiple packages to create interoperable anchor names
+and links to those anchors.
+
+At this time, it does not try to ensure that generated anchor names
+are unique, that responsibility falls on the caller.
+
+Installation
+------------
+
+```bash
+go get -u github.com/shurcooL/sanitized_anchor_name
+```
+
+Example
+-------
+
+```Go
+anchorName := sanitized_anchor_name.Create("This is a header")
+
+fmt.Println(anchorName)
+
+// Output:
+// this-is-a-header
+```
+
+License
+-------
+
+-	[MIT License](LICENSE)
diff --git a/vendor/github.com/shurcooL/sanitized_anchor_name/go.mod b/vendor/github.com/shurcooL/sanitized_anchor_name/go.mod
new file mode 100644
index 00000000..1e255347
--- /dev/null
+++ b/vendor/github.com/shurcooL/sanitized_anchor_name/go.mod
@@ -0,0 +1 @@
+module github.com/shurcooL/sanitized_anchor_name
diff --git a/vendor/github.com/shurcooL/sanitized_anchor_name/main.go b/vendor/github.com/shurcooL/sanitized_anchor_name/main.go
new file mode 100644
index 00000000..6a77d124
--- /dev/null
+++ b/vendor/github.com/shurcooL/sanitized_anchor_name/main.go
@@ -0,0 +1,29 @@
+// Package sanitized_anchor_name provides a func to create sanitized anchor names.
+//
+// Its logic can be reused by multiple packages to create interoperable anchor names
+// and links to those anchors.
+//
+// At this time, it does not try to ensure that generated anchor names
+// are unique, that responsibility falls on the caller.
+package sanitized_anchor_name // import "github.com/shurcooL/sanitized_anchor_name"
+
+import "unicode"
+
+// Create returns a sanitized anchor name for the given text.
+func Create(text string) string {
+	var anchorName []rune
+	var futureDash = false
+	for _, r := range text {
+		switch {
+		case unicode.IsLetter(r) || unicode.IsNumber(r):
+			if futureDash && len(anchorName) > 0 {
+				anchorName = append(anchorName, '-')
+			}
+			futureDash = false
+			anchorName = append(anchorName, unicode.ToLower(r))
+		default:
+			futureDash = true
+		}
+	}
+	return string(anchorName)
+}
diff --git a/vendor/gopkg.in/urfave/cli.v2/.flake8 b/vendor/github.com/urfave/cli/v2/.flake8
similarity index 100%
rename from vendor/gopkg.in/urfave/cli.v2/.flake8
rename to vendor/github.com/urfave/cli/v2/.flake8
diff --git a/vendor/github.com/urfave/cli/v2/.gitignore b/vendor/github.com/urfave/cli/v2/.gitignore
new file mode 100644
index 00000000..2d5e149b
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/.gitignore
@@ -0,0 +1,7 @@
+*.coverprofile
+*.orig
+node_modules/
+vendor
+.idea
+internal/*/built-example
+coverage.txt
diff --git a/vendor/github.com/urfave/cli/v2/CODE_OF_CONDUCT.md b/vendor/github.com/urfave/cli/v2/CODE_OF_CONDUCT.md
new file mode 100644
index 00000000..41ba294f
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/CODE_OF_CONDUCT.md
@@ -0,0 +1,74 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, gender identity and expression, level of experience,
+education, socio-economic status, nationality, personal appearance, race,
+religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+  advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+  address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting Dan Buch at dan@meatballhat.com. All complaints will be
+reviewed and investigated and will result in a response that is deemed necessary
+and appropriate to the circumstances. The project team is obligated to maintain
+confidentiality with regard to the reporter of an incident.  Further details of
+specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
diff --git a/vendor/gopkg.in/urfave/cli.v2/LICENSE b/vendor/github.com/urfave/cli/v2/LICENSE
similarity index 100%
rename from vendor/gopkg.in/urfave/cli.v2/LICENSE
rename to vendor/github.com/urfave/cli/v2/LICENSE
diff --git a/vendor/github.com/urfave/cli/v2/README.md b/vendor/github.com/urfave/cli/v2/README.md
new file mode 100644
index 00000000..c9237fbc
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/README.md
@@ -0,0 +1,66 @@
+cli
+===
+
+[![GoDoc](https://godoc.org/github.com/urfave/cli?status.svg)](https://godoc.org/github.com/urfave/cli)
+[![codebeat](https://codebeat.co/badges/0a8f30aa-f975-404b-b878-5fab3ae1cc5f)](https://codebeat.co/projects/github-com-urfave-cli)
+[![Go Report Card](https://goreportcard.com/badge/urfave/cli)](https://goreportcard.com/report/urfave/cli)
+[![codecov](https://codecov.io/gh/urfave/cli/branch/master/graph/badge.svg)](https://codecov.io/gh/urfave/cli)
+
+cli is a simple, fast, and fun package for building command line apps in Go. The
+goal is to enable developers to write fast and distributable command line
+applications in an expressive way.
+
+## Usage Documentation
+
+Usage documentation exists for each major version. Don't know what version you're on? You're probably using the version from the `master` branch, which is currently `v2`.
+
+- `v2` - [./docs/v2/manual.md](./docs/v2/manual.md)
+- `v1` - [./docs/v1/manual.md](./docs/v1/manual.md)
+
+## Installation
+
+Make sure you have a working Go environment.  Go version 1.11+ is supported. [See the install instructions for Go](http://golang.org/doc/install.html).
+
+Go Modules are strongly recommended when using this package. [See the go blog guide on using Go Modules](https://blog.golang.org/using-go-modules).
+
+### Using `v2` releases
+
+```
+$ GO111MODULE=on go get github.com/urfave/cli/v2
+```
+
+```go
+...
+import (
+  "github.com/urfave/cli/v2" // imports as package "cli"
+)
+...
+```
+
+### Using `v1` releases
+
+```
+$ GO111MODULE=on go get github.com/urfave/cli
+```
+
+```go
+...
+import (
+  "github.com/urfave/cli"
+)
+...
+```
+
+### GOPATH
+
+Make sure your `PATH` includes the `$GOPATH/bin` directory so your commands can
+be easily used:
+```
+export PATH=$PATH:$GOPATH/bin
+```
+
+### Supported platforms
+
+cli is tested against multiple versions of Go on Linux, and against the latest
+released version of Go on OS X and Windows. This project uses Github Actions for
+builds. For more build info, please look at the [./.github/workflows/cli.yml](https://github.com/urfave/cli/blob/master/.github/workflows/cli.yml).
diff --git a/vendor/gopkg.in/urfave/cli.v2/altsrc/flag.go b/vendor/github.com/urfave/cli/v2/altsrc/flag.go
similarity index 95%
rename from vendor/gopkg.in/urfave/cli.v2/altsrc/flag.go
rename to vendor/github.com/urfave/cli/v2/altsrc/flag.go
index 858e54ea..31b8a04e 100644
--- a/vendor/gopkg.in/urfave/cli.v2/altsrc/flag.go
+++ b/vendor/github.com/urfave/cli/v2/altsrc/flag.go
@@ -6,7 +6,7 @@ import (
 	"strconv"
 	"syscall"
 
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 )
 
 // FlagInputSourceExtension is an extension interface of cli.Flag that
@@ -72,7 +72,7 @@ func (f *GenericFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourc
 			}
 			if value != nil {
 				for _, name := range f.Names() {
-					f.set.Set(name, value.String())
+					_ = f.set.Set(name, value.String())
 				}
 			}
 		}
@@ -135,7 +135,7 @@ func (f *BoolFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceCo
 			}
 			if value {
 				for _, name := range f.Names() {
-					f.set.Set(name, strconv.FormatBool(value))
+					_ = f.set.Set(name, strconv.FormatBool(value))
 				}
 			}
 		}
@@ -153,7 +153,7 @@ func (f *StringFlag) ApplyInputSourceValue(context *cli.Context, isc InputSource
 			}
 			if value != "" {
 				for _, name := range f.Names() {
-					f.set.Set(name, value)
+					_ = f.set.Set(name, value)
 				}
 			}
 		}
@@ -181,7 +181,7 @@ func (f *PathFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceCo
 						value = filepath.Join(filepath.Dir(basePathAbs), value)
 					}
 
-					f.set.Set(name, value)
+					_ = f.set.Set(name, value)
 				}
 			}
 		}
@@ -199,7 +199,7 @@ func (f *IntFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceCon
 			}
 			if value > 0 {
 				for _, name := range f.Names() {
-					f.set.Set(name, strconv.FormatInt(int64(value), 10))
+					_ = f.set.Set(name, strconv.FormatInt(int64(value), 10))
 				}
 			}
 		}
@@ -217,7 +217,7 @@ func (f *DurationFlag) ApplyInputSourceValue(context *cli.Context, isc InputSour
 			}
 			if value > 0 {
 				for _, name := range f.Names() {
-					f.set.Set(name, value.String())
+					_ = f.set.Set(name, value.String())
 				}
 			}
 		}
@@ -236,7 +236,7 @@ func (f *Float64Flag) ApplyInputSourceValue(context *cli.Context, isc InputSourc
 			if value > 0 {
 				floatStr := float64ToString(value)
 				for _, name := range f.Names() {
-					f.set.Set(name, floatStr)
+					_ = f.set.Set(name, floatStr)
 				}
 			}
 		}
diff --git a/vendor/github.com/urfave/cli/v2/altsrc/flag_generated.go b/vendor/github.com/urfave/cli/v2/altsrc/flag_generated.go
new file mode 100644
index 00000000..c9ecea82
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/altsrc/flag_generated.go
@@ -0,0 +1,275 @@
+// Code generated by fg; DO NOT EDIT.
+
+package altsrc
+
+import (
+	"flag"
+
+	"github.com/urfave/cli/v2"
+)
+
+// BoolFlag is the flag type that wraps cli.BoolFlag to allow
+// for other values to be specified
+type BoolFlag struct {
+	*cli.BoolFlag
+	set *flag.FlagSet
+}
+
+// NewBoolFlag creates a new BoolFlag
+func NewBoolFlag(fl *cli.BoolFlag) *BoolFlag {
+	return &BoolFlag{BoolFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped BoolFlag.Apply
+func (f *BoolFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.BoolFlag.Apply(set)
+}
+
+// DurationFlag is the flag type that wraps cli.DurationFlag to allow
+// for other values to be specified
+type DurationFlag struct {
+	*cli.DurationFlag
+	set *flag.FlagSet
+}
+
+// NewDurationFlag creates a new DurationFlag
+func NewDurationFlag(fl *cli.DurationFlag) *DurationFlag {
+	return &DurationFlag{DurationFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped DurationFlag.Apply
+func (f *DurationFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.DurationFlag.Apply(set)
+}
+
+// Float64Flag is the flag type that wraps cli.Float64Flag to allow
+// for other values to be specified
+type Float64Flag struct {
+	*cli.Float64Flag
+	set *flag.FlagSet
+}
+
+// NewFloat64Flag creates a new Float64Flag
+func NewFloat64Flag(fl *cli.Float64Flag) *Float64Flag {
+	return &Float64Flag{Float64Flag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped Float64Flag.Apply
+func (f *Float64Flag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.Float64Flag.Apply(set)
+}
+
+// GenericFlag is the flag type that wraps cli.GenericFlag to allow
+// for other values to be specified
+type GenericFlag struct {
+	*cli.GenericFlag
+	set *flag.FlagSet
+}
+
+// NewGenericFlag creates a new GenericFlag
+func NewGenericFlag(fl *cli.GenericFlag) *GenericFlag {
+	return &GenericFlag{GenericFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped GenericFlag.Apply
+func (f *GenericFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.GenericFlag.Apply(set)
+}
+
+// Int64Flag is the flag type that wraps cli.Int64Flag to allow
+// for other values to be specified
+type Int64Flag struct {
+	*cli.Int64Flag
+	set *flag.FlagSet
+}
+
+// NewInt64Flag creates a new Int64Flag
+func NewInt64Flag(fl *cli.Int64Flag) *Int64Flag {
+	return &Int64Flag{Int64Flag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped Int64Flag.Apply
+func (f *Int64Flag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.Int64Flag.Apply(set)
+}
+
+// IntFlag is the flag type that wraps cli.IntFlag to allow
+// for other values to be specified
+type IntFlag struct {
+	*cli.IntFlag
+	set *flag.FlagSet
+}
+
+// NewIntFlag creates a new IntFlag
+func NewIntFlag(fl *cli.IntFlag) *IntFlag {
+	return &IntFlag{IntFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped IntFlag.Apply
+func (f *IntFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.IntFlag.Apply(set)
+}
+
+// IntSliceFlag is the flag type that wraps cli.IntSliceFlag to allow
+// for other values to be specified
+type IntSliceFlag struct {
+	*cli.IntSliceFlag
+	set *flag.FlagSet
+}
+
+// NewIntSliceFlag creates a new IntSliceFlag
+func NewIntSliceFlag(fl *cli.IntSliceFlag) *IntSliceFlag {
+	return &IntSliceFlag{IntSliceFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped IntSliceFlag.Apply
+func (f *IntSliceFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.IntSliceFlag.Apply(set)
+}
+
+// Int64SliceFlag is the flag type that wraps cli.Int64SliceFlag to allow
+// for other values to be specified
+type Int64SliceFlag struct {
+	*cli.Int64SliceFlag
+	set *flag.FlagSet
+}
+
+// NewInt64SliceFlag creates a new Int64SliceFlag
+func NewInt64SliceFlag(fl *cli.Int64SliceFlag) *Int64SliceFlag {
+	return &Int64SliceFlag{Int64SliceFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped Int64SliceFlag.Apply
+func (f *Int64SliceFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.Int64SliceFlag.Apply(set)
+}
+
+// Float64SliceFlag is the flag type that wraps cli.Float64SliceFlag to allow
+// for other values to be specified
+type Float64SliceFlag struct {
+	*cli.Float64SliceFlag
+	set *flag.FlagSet
+}
+
+// NewFloat64SliceFlag creates a new Float64SliceFlag
+func NewFloat64SliceFlag(fl *cli.Float64SliceFlag) *Float64SliceFlag {
+	return &Float64SliceFlag{Float64SliceFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls the
+// wrapped Float64SliceFlag.Apply
+func (f *Float64SliceFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.Float64SliceFlag.Apply(set)
+}
+
+// StringFlag is the flag type that wraps cli.StringFlag to allow
+// for other values to be specified
+type StringFlag struct {
+	*cli.StringFlag
+	set *flag.FlagSet
+}
+
+// NewStringFlag creates a new StringFlag
+func NewStringFlag(fl *cli.StringFlag) *StringFlag {
+	return &StringFlag{StringFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped StringFlag.Apply
+func (f *StringFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.StringFlag.Apply(set)
+}
+
+// PathFlag is the flag type that wraps cli.PathFlag to allow
+// for other values to be specified
+type PathFlag struct {
+	*cli.PathFlag
+	set *flag.FlagSet
+}
+
+// NewPathFlag creates a new PathFlag
+func NewPathFlag(fl *cli.PathFlag) *PathFlag {
+	return &PathFlag{PathFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls the
+// wrapped PathFlag.Apply
+func (f *PathFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.PathFlag.Apply(set)
+}
+
+// StringSliceFlag is the flag type that wraps cli.StringSliceFlag to allow
+// for other values to be specified
+type StringSliceFlag struct {
+	*cli.StringSliceFlag
+	set *flag.FlagSet
+}
+
+// NewStringSliceFlag creates a new StringSliceFlag
+func NewStringSliceFlag(fl *cli.StringSliceFlag) *StringSliceFlag {
+	return &StringSliceFlag{StringSliceFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped StringSliceFlag.Apply
+func (f *StringSliceFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.StringSliceFlag.Apply(set)
+}
+
+// Uint64Flag is the flag type that wraps cli.Uint64Flag to allow
+// for other values to be specified
+type Uint64Flag struct {
+	*cli.Uint64Flag
+	set *flag.FlagSet
+}
+
+// NewUint64Flag creates a new Uint64Flag
+func NewUint64Flag(fl *cli.Uint64Flag) *Uint64Flag {
+	return &Uint64Flag{Uint64Flag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped Uint64Flag.Apply
+func (f *Uint64Flag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.Uint64Flag.Apply(set)
+}
+
+// UintFlag is the flag type that wraps cli.UintFlag to allow
+// for other values to be specified
+type UintFlag struct {
+	*cli.UintFlag
+	set *flag.FlagSet
+}
+
+// NewUintFlag creates a new UintFlag
+func NewUintFlag(fl *cli.UintFlag) *UintFlag {
+	return &UintFlag{UintFlag: fl, set: nil}
+}
+
+// Apply saves the flagSet for later usage calls, then calls
+// the wrapped UintFlag.Apply
+func (f *UintFlag) Apply(set *flag.FlagSet) error {
+	f.set = set
+	return f.UintFlag.Apply(set)
+}
diff --git a/vendor/gopkg.in/urfave/cli.v2/altsrc/input_source_context.go b/vendor/github.com/urfave/cli/v2/altsrc/input_source_context.go
similarity index 95%
rename from vendor/gopkg.in/urfave/cli.v2/altsrc/input_source_context.go
rename to vendor/github.com/urfave/cli/v2/altsrc/input_source_context.go
index bb0afdb4..a639d8b3 100644
--- a/vendor/gopkg.in/urfave/cli.v2/altsrc/input_source_context.go
+++ b/vendor/github.com/urfave/cli/v2/altsrc/input_source_context.go
@@ -3,7 +3,7 @@ package altsrc
 import (
 	"time"
 
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 )
 
 // InputSourceContext is an interface used to allow
diff --git a/vendor/gopkg.in/urfave/cli.v2/altsrc/json_source_context.go b/vendor/github.com/urfave/cli/v2/altsrc/json_source_context.go
similarity index 82%
rename from vendor/gopkg.in/urfave/cli.v2/altsrc/json_source_context.go
rename to vendor/github.com/urfave/cli/v2/altsrc/json_source_context.go
index 34c7eb95..7d70a2a5 100644
--- a/vendor/gopkg.in/urfave/cli.v2/altsrc/json_source_context.go
+++ b/vendor/github.com/urfave/cli/v2/altsrc/json_source_context.go
@@ -8,7 +8,7 @@ import (
 	"strings"
 	"time"
 
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 )
 
 // NewJSONSourceFromFlagFunc returns a func that takes a cli.Context
@@ -29,13 +29,8 @@ func NewJSONSourceFromFile(f string) (InputSourceContext, error) {
 	if err != nil {
 		return nil, err
 	}
-	s, err := newJSONSource(data)
-	if err != nil {
-		return nil, err
-	}
 
-	s.file = f
-	return s, nil
+	return NewJSONSource(data)
 }
 
 // NewJSONSourceFromReader returns an InputSourceContext suitable for
@@ -51,10 +46,6 @@ func NewJSONSourceFromReader(r io.Reader) (InputSourceContext, error) {
 // NewJSONSource returns an InputSourceContext suitable for retrieving
 // config variables from raw JSON data.
 func NewJSONSource(data []byte) (InputSourceContext, error) {
-	return newJSONSource(data)
-}
-
-func newJSONSource(data []byte) (*jsonSource, error) {
 	var deserialized map[string]interface{}
 	if err := json.Unmarshal(data, &deserialized); err != nil {
 		return nil, err
@@ -76,10 +67,10 @@ func (x *jsonSource) Int(name string) (int, error) {
 		return 0, fmt.Errorf("unexpected type %T for %q", i, name)
 	case int:
 		return v, nil
-	case float64:
-		return int(float64(v)), nil
 	case float32:
-		return int(float32(v)), nil
+		return int(v), nil
+	case float64:
+		return int(v), nil
 	}
 }
 
@@ -88,9 +79,9 @@ func (x *jsonSource) Duration(name string) (time.Duration, error) {
 	if err != nil {
 		return 0, err
 	}
-	v, ok := (time.Duration)(0), false
-	if v, ok = i.(time.Duration); !ok {
-		return v, fmt.Errorf("unexpected type %T for %q", i, name)
+	v, ok := i.(time.Duration)
+	if !ok {
+		return 0, fmt.Errorf("unexpected type %T for %q", i, name)
 	}
 	return v, nil
 }
@@ -100,9 +91,9 @@ func (x *jsonSource) Float64(name string) (float64, error) {
 	if err != nil {
 		return 0, err
 	}
-	v, ok := (float64)(0), false
-	if v, ok = i.(float64); !ok {
-		return v, fmt.Errorf("unexpected type %T for %q", i, name)
+	v, ok := i.(float64)
+	if !ok {
+		return 0, fmt.Errorf("unexpected type %T for %q", i, name)
 	}
 	return v, nil
 }
@@ -112,9 +103,9 @@ func (x *jsonSource) String(name string) (string, error) {
 	if err != nil {
 		return "", err
 	}
-	v, ok := "", false
-	if v, ok = i.(string); !ok {
-		return v, fmt.Errorf("unexpected type %T for %q", i, name)
+	v, ok := i.(string)
+	if !ok {
+		return "", fmt.Errorf("unexpected type %T for %q", i, name)
 	}
 	return v, nil
 }
@@ -170,9 +161,9 @@ func (x *jsonSource) Generic(name string) (cli.Generic, error) {
 	if err != nil {
 		return nil, err
 	}
-	v, ok := (cli.Generic)(nil), false
-	if v, ok = i.(cli.Generic); !ok {
-		return v, fmt.Errorf("unexpected type %T for %q", i, name)
+	v, ok := i.(cli.Generic)
+	if !ok {
+		return nil, fmt.Errorf("unexpected type %T for %q", i, name)
 	}
 	return v, nil
 }
@@ -182,9 +173,9 @@ func (x *jsonSource) Bool(name string) (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	v, ok := false, false
-	if v, ok = i.(bool); !ok {
-		return v, fmt.Errorf("unexpected type %T for %q", i, name)
+	v, ok := i.(bool)
+	if !ok {
+		return false, fmt.Errorf("unexpected type %T for %q", i, name)
 	}
 	return v, nil
 }
diff --git a/vendor/gopkg.in/urfave/cli.v2/altsrc/map_input_source.go b/vendor/github.com/urfave/cli/v2/altsrc/map_input_source.go
similarity index 97%
rename from vendor/gopkg.in/urfave/cli.v2/altsrc/map_input_source.go
rename to vendor/github.com/urfave/cli/v2/altsrc/map_input_source.go
index 41221b18..661b7856 100644
--- a/vendor/gopkg.in/urfave/cli.v2/altsrc/map_input_source.go
+++ b/vendor/github.com/urfave/cli/v2/altsrc/map_input_source.go
@@ -6,7 +6,7 @@ import (
 	"strings"
 	"time"
 
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 )
 
 // MapInputSource implements InputSourceContext to return
@@ -23,15 +23,15 @@ func nestedVal(name string, tree map[interface{}]interface{}) (interface{}, bool
 	if sections := strings.Split(name, "."); len(sections) > 1 {
 		node := tree
 		for _, section := range sections[:len(sections)-1] {
-			if child, ok := node[section]; !ok {
+			child, ok := node[section]
+			if !ok {
 				return nil, false
-			} else {
-				if ctype, ok := child.(map[interface{}]interface{}); !ok {
-					return nil, false
-				} else {
-					node = ctype
-				}
 			}
+			ctype, ok := child.(map[interface{}]interface{})
+			if !ok {
+				return nil, false
+			}
+			node = ctype
 		}
 		if val, ok := node[sections[len(sections)-1]]; ok {
 			return val, true
diff --git a/vendor/gopkg.in/urfave/cli.v2/altsrc/toml_file_loader.go b/vendor/github.com/urfave/cli/v2/altsrc/toml_file_loader.go
similarity index 88%
rename from vendor/gopkg.in/urfave/cli.v2/altsrc/toml_file_loader.go
rename to vendor/github.com/urfave/cli/v2/altsrc/toml_file_loader.go
index 1cb2d7b9..c679fdbe 100644
--- a/vendor/gopkg.in/urfave/cli.v2/altsrc/toml_file_loader.go
+++ b/vendor/github.com/urfave/cli/v2/altsrc/toml_file_loader.go
@@ -1,8 +1,3 @@
-// Disabling building of toml support in cases where golang is 1.0 or 1.1
-// as the encoding library is not implemented or supported.
-
-// +build go1.2
-
 package altsrc
 
 import (
@@ -10,7 +5,7 @@ import (
 	"reflect"
 
 	"github.com/BurntSushi/toml"
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 )
 
 type tomlMap struct {
@@ -28,7 +23,7 @@ func unmarshalMap(i interface{}) (ret map[interface{}]interface{}, err error) {
 		case reflect.String:
 			ret[key] = val.(string)
 		case reflect.Int:
-			ret[key] = int(val.(int))
+			ret[key] = val.(int)
 		case reflect.Int8:
 			ret[key] = int(val.(int8))
 		case reflect.Int16:
@@ -50,7 +45,7 @@ func unmarshalMap(i interface{}) (ret map[interface{}]interface{}, err error) {
 		case reflect.Float32:
 			ret[key] = float64(val.(float32))
 		case reflect.Float64:
-			ret[key] = float64(val.(float64))
+			ret[key] = val.(float64)
 		case reflect.Map:
 			if tmp, err := unmarshalMap(val); err == nil {
 				ret[key] = tmp
@@ -66,9 +61,9 @@ func unmarshalMap(i interface{}) (ret map[interface{}]interface{}, err error) {
 	return ret, nil
 }
 
-func (self *tomlMap) UnmarshalTOML(i interface{}) error {
+func (tm *tomlMap) UnmarshalTOML(i interface{}) error {
 	if tmp, err := unmarshalMap(i); err == nil {
-		self.Map = tmp
+		tm.Map = tmp
 	} else {
 		return err
 	}
diff --git a/vendor/gopkg.in/urfave/cli.v2/altsrc/yaml_file_loader.go b/vendor/github.com/urfave/cli/v2/altsrc/yaml_file_loader.go
similarity index 89%
rename from vendor/gopkg.in/urfave/cli.v2/altsrc/yaml_file_loader.go
rename to vendor/github.com/urfave/cli/v2/altsrc/yaml_file_loader.go
index 37c8d9c7..cf2f8a5c 100644
--- a/vendor/gopkg.in/urfave/cli.v2/altsrc/yaml_file_loader.go
+++ b/vendor/github.com/urfave/cli/v2/altsrc/yaml_file_loader.go
@@ -1,8 +1,3 @@
-// Disabling building of yaml support in cases where golang is 1.0 or 1.1
-// as the encoding library is not implemented or supported.
-
-// +build go1.2
-
 package altsrc
 
 import (
@@ -14,7 +9,7 @@ import (
 	"runtime"
 	"strings"
 
-	"gopkg.in/urfave/cli.v2"
+	"github.com/urfave/cli/v2"
 
 	"gopkg.in/yaml.v2"
 )
@@ -86,7 +81,7 @@ func loadDataFrom(filePath string) ([]byte, error) {
 			return nil, fmt.Errorf("Cannot read from file: '%s' because it does not exist.", filePath)
 		}
 		return ioutil.ReadFile(filePath)
-	} else {
-		return nil, fmt.Errorf("unable to determine how to load from path %s", filePath)
 	}
+
+	return nil, fmt.Errorf("unable to determine how to load from path %s", filePath)
 }
diff --git a/vendor/gopkg.in/urfave/cli.v2/app.go b/vendor/github.com/urfave/cli/v2/app.go
similarity index 62%
rename from vendor/gopkg.in/urfave/cli.v2/app.go
rename to vendor/github.com/urfave/cli/v2/app.go
index fca28c71..d0c8f84e 100644
--- a/vendor/gopkg.in/urfave/cli.v2/app.go
+++ b/vendor/github.com/urfave/cli/v2/app.go
@@ -1,17 +1,27 @@
 package cli
 
 import (
+	"context"
+	"flag"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
-	"reflect"
 	"sort"
 	"time"
 )
 
-// App is the main structure of a cli application.
+var (
+	changeLogURL            = "https://github.com/urfave/cli/blob/master/docs/CHANGELOG.md"
+	appActionDeprecationURL = fmt.Sprintf("%s#deprecated-cli-app-action-signature", changeLogURL)
+	contactSysadmin         = "This is an error in the application.  Please contact the distributor of this application if this is not you."
+	errInvalidActionType    = NewExitError("ERROR invalid Action type. "+
+		fmt.Sprintf("Must be `func(*Context`)` or `func(*Context) error).  %s", contactSysadmin)+
+		fmt.Sprintf("See %s", appActionDeprecationURL), 2)
+)
+
+// App is the main structure of a cli application. It is recommended that
+// an app be created with the cli.NewApp() function
 type App struct {
 	// The name of the program. Defaults to path.Base(os.Args[0])
 	Name string
@@ -31,16 +41,19 @@ type App struct {
 	Commands []*Command
 	// List of flags to parse
 	Flags []Flag
-	// Boolean to enable shell completion commands
-	EnableShellCompletion bool
-	// Boolean to hide built-in help command
+	// Boolean to enable bash completion commands
+	EnableBashCompletion bool
+	// Boolean to hide built-in help command and help flag
 	HideHelp bool
+	// Boolean to hide built-in help command but keep help flag.
+	// Ignored if HideHelp is true.
+	HideHelpCommand bool
 	// Boolean to hide built-in version flag and the VERSION section of help
 	HideVersion bool
-	// Categories contains the categorized commands and is populated on app startup
-	Categories CommandCategories
+	// categories contains the categorized commands and is populated on app startup
+	categories CommandCategories
 	// An action to execute when the shell completion flag is set
-	ShellComplete ShellCompleteFunc
+	BashComplete BashCompleteFunc
 	// An action to execute before any subcommands are run, but after the context is ready
 	// If a non-nil error is returned, no subcommands are run
 	Before BeforeFunc
@@ -63,6 +76,9 @@ type App struct {
 	Writer io.Writer
 	// ErrWriter writes error output
 	ErrWriter io.Writer
+	// Execute this function to handle ExitErrors. If not provided, HandleExitCoder is provided to
+	// function as a default, so this is optional.
+	ExitErrHandler ExitErrHandlerFunc
 	// Other custom info
 	Metadata map[string]interface{}
 	// Carries a function which returns app specific info.
@@ -71,6 +87,10 @@ type App struct {
 	// cli.go uses text/template to render templates. You can
 	// render custom help text by setting this variable.
 	CustomAppHelpTemplate string
+	// Boolean to enable short-option handling so user can combine several
+	// single-character bool arguments into one
+	// i.e. foobar -o -v -> foobar -ov
+	UseShortOptionHandling bool
 
 	didSetup bool
 }
@@ -85,6 +105,21 @@ func compileTime() time.Time {
 	return info.ModTime()
 }
 
+// NewApp creates a new cli Application with some reasonable defaults for Name,
+// Usage, Version and Action.
+func NewApp() *App {
+	return &App{
+		Name:         filepath.Base(os.Args[0]),
+		HelpName:     filepath.Base(os.Args[0]),
+		Usage:        "A new cli application",
+		UsageText:    "",
+		BashComplete: DefaultAppComplete,
+		Action:       helpCommand.Action,
+		Compiled:     compileTime(),
+		Writer:       os.Stdout,
+	}
+}
+
 // Setup runs initialization code to ensure all data structures are ready for
 // `Run` or inspection prior to `Run`.  It is internally called by `Run`, but
 // will return early if setup has already happened.
@@ -108,11 +143,11 @@ func (a *App) Setup() {
 	}
 
 	if a.Version == "" {
-		a.Version = "0.0.0"
+		a.HideVersion = true
 	}
 
-	if a.ShellComplete == nil {
-		a.ShellComplete = DefaultAppComplete
+	if a.BashComplete == nil {
+		a.BashComplete = DefaultAppComplete
 	}
 
 	if a.Action == nil {
@@ -127,37 +162,35 @@ func (a *App) Setup() {
 		a.Writer = os.Stdout
 	}
 
-	newCmds := []*Command{}
+	var newCommands []*Command
+
 	for _, c := range a.Commands {
 		if c.HelpName == "" {
 			c.HelpName = fmt.Sprintf("%s %s", a.HelpName, c.Name)
 		}
-		newCmds = append(newCmds, c)
+		newCommands = append(newCommands, c)
 	}
-	a.Commands = newCmds
+	a.Commands = newCommands
 
 	if a.Command(helpCommand.Name) == nil && !a.HideHelp {
-		a.appendCommand(helpCommand)
+		if !a.HideHelpCommand {
+			a.appendCommand(helpCommand)
+		}
 
 		if HelpFlag != nil {
 			a.appendFlag(HelpFlag)
 		}
 	}
 
-	if a.EnableShellCompletion {
-		a.appendFlag(GenerateCompletionFlag)
-		a.appendFlag(InitCompletionFlag)
-	}
-
 	if !a.HideVersion {
 		a.appendFlag(VersionFlag)
 	}
 
-	a.Categories = newCommandCategories()
+	a.categories = newCommandCategories()
 	for _, command := range a.Commands {
-		a.Categories.AddCommand(command.Category, command)
+		a.categories.AddCommand(command.Category, command)
 	}
-	sort.Sort(a.Categories.(*commandCategories))
+	sort.Sort(a.categories.(*commandCategories))
 
 	if a.Metadata == nil {
 		a.Metadata = make(map[string]interface{})
@@ -168,9 +201,24 @@ func (a *App) Setup() {
 	}
 }
 
+func (a *App) newFlagSet() (*flag.FlagSet, error) {
+	return flagSet(a.Name, a.Flags)
+}
+
+func (a *App) useShortOptionHandling() bool {
+	return a.UseShortOptionHandling
+}
+
 // Run is the entry point to the cli app. Parses the arguments slice and routes
 // to the proper flag/args combination
 func (a *App) Run(arguments []string) (err error) {
+	return a.RunContext(context.Background(), arguments)
+}
+
+// RunContext is like Run except it takes a Context that will be
+// passed to its commands and sub-commands. Through this, you can
+// propagate timeouts and cancellation requests
+func (a *App) RunContext(ctx context.Context, arguments []string) (err error) {
 	a.Setup()
 
 	// handle the completion flag separately from the flagset since
@@ -181,19 +229,17 @@ func (a *App) Run(arguments []string) (err error) {
 	// always appends the completion flag at the end of the command
 	shellComplete, arguments := checkShellCompleteFlag(a, arguments)
 
-	// parse flags
-	set, err := flagSet(a.Name, a.Flags)
+	set, err := a.newFlagSet()
 	if err != nil {
 		return err
 	}
 
-	set.SetOutput(ioutil.Discard)
-	err = set.Parse(arguments[1:])
+	err = parseIter(set, a, arguments[1:], shellComplete)
 	nerr := normalizeFlags(a.Flags, set)
-	context := NewContext(a, set, nil)
+	context := NewContext(a, set, &Context{Context: ctx})
 	if nerr != nil {
-		fmt.Fprintln(a.Writer, nerr)
-		ShowAppHelp(context)
+		_, _ = fmt.Fprintln(a.Writer, nerr)
+		_ = ShowAppHelp(context)
 		return nerr
 	}
 	context.shellComplete = shellComplete
@@ -202,27 +248,19 @@ func (a *App) Run(arguments []string) (err error) {
 		return nil
 	}
 
-	if done, cerr := checkInitCompletion(context); done {
-		if cerr != nil {
-			err = cerr
-		} else {
-			return nil
-		}
-	}
-
 	if err != nil {
 		if a.OnUsageError != nil {
 			err := a.OnUsageError(context, err, false)
-			HandleExitCoder(err)
+			a.handleExitCoder(context, err)
 			return err
 		}
-		fmt.Fprintf(a.Writer, "%s %s\n\n", "Incorrect Usage.", err.Error())
-		ShowAppHelp(context)
+		_, _ = fmt.Fprintf(a.Writer, "%s %s\n\n", "Incorrect Usage.", err.Error())
+		_ = ShowAppHelp(context)
 		return err
 	}
 
 	if !a.HideHelp && checkHelp(context) {
-		ShowAppHelp(context)
+		_ = ShowAppHelp(context)
 		return nil
 	}
 
@@ -231,6 +269,12 @@ func (a *App) Run(arguments []string) (err error) {
 		return nil
 	}
 
+	cerr := checkRequiredFlags(a.Flags, context)
+	if cerr != nil {
+		_ = ShowAppHelp(context)
+		return cerr
+	}
+
 	if a.After != nil {
 		defer func() {
 			if afterErr := a.After(context); afterErr != nil {
@@ -246,8 +290,9 @@ func (a *App) Run(arguments []string) (err error) {
 	if a.Before != nil {
 		beforeErr := a.Before(context)
 		if beforeErr != nil {
-			ShowAppHelp(context)
-			HandleExitCoder(beforeErr)
+			_, _ = fmt.Fprintf(a.Writer, "%v\n\n", beforeErr)
+			_ = ShowAppHelp(context)
+			a.handleExitCoder(context, beforeErr)
 			err = beforeErr
 			return err
 		}
@@ -269,27 +314,29 @@ func (a *App) Run(arguments []string) (err error) {
 	// Run default Action
 	err = a.Action(context)
 
-	HandleExitCoder(err)
+	a.handleExitCoder(context, err)
 	return err
 }
 
+// RunAndExitOnError calls .Run() and exits non-zero if an error was returned
+//
+// Deprecated: instead you should return an error that fulfills cli.ExitCoder
+// to cli.App.Run. This will cause the application to exit with the given eror
+// code in the cli.ExitCoder
+func (a *App) RunAndExitOnError() {
+	if err := a.Run(os.Args); err != nil {
+		_, _ = fmt.Fprintln(a.errWriter(), err)
+		OsExiter(1)
+	}
+}
+
 // RunAsSubcommand invokes the subcommand given the context, parses ctx.Args() to
 // generate command-specific flags
 func (a *App) RunAsSubcommand(ctx *Context) (err error) {
+	// Setup also handles HideHelp and HideHelpCommand
 	a.Setup()
 
-	// append help to commands
-	if len(a.Commands) > 0 {
-		if a.Command(helpCommand.Name) == nil && !a.HideHelp {
-			a.appendCommand(helpCommand)
-
-			if HelpFlag != nil {
-				a.appendFlag(HelpFlag)
-			}
-		}
-	}
-
-	newCmds := []*Command{}
+	var newCmds []*Command
 	for _, c := range a.Commands {
 		if c.HelpName == "" {
 			c.HelpName = fmt.Sprintf("%s %s", a.HelpName, c.Name)
@@ -298,29 +345,22 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 	}
 	a.Commands = newCmds
 
-	// append flags
-	if a.EnableShellCompletion {
-		a.appendFlag(GenerateCompletionFlag)
-	}
-
-	// parse flags
-	set, err := flagSet(a.Name, a.Flags)
+	set, err := a.newFlagSet()
 	if err != nil {
 		return err
 	}
 
-	set.SetOutput(ioutil.Discard)
-	err = set.Parse(ctx.Args().Tail())
+	err = parseIter(set, a, ctx.Args().Tail(), ctx.shellComplete)
 	nerr := normalizeFlags(a.Flags, set)
 	context := NewContext(a, set, ctx)
 
 	if nerr != nil {
-		fmt.Fprintln(a.Writer, nerr)
-		fmt.Fprintln(a.Writer)
+		_, _ = fmt.Fprintln(a.Writer, nerr)
+		_, _ = fmt.Fprintln(a.Writer)
 		if len(a.Commands) > 0 {
-			ShowSubcommandHelp(context)
+			_ = ShowSubcommandHelp(context)
 		} else {
-			ShowCommandHelp(ctx, context.Args().First())
+			_ = ShowCommandHelp(ctx, context.Args().First())
 		}
 		return nerr
 	}
@@ -332,11 +372,11 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 	if err != nil {
 		if a.OnUsageError != nil {
 			err = a.OnUsageError(context, err, true)
-			HandleExitCoder(err)
+			a.handleExitCoder(context, err)
 			return err
 		}
-		fmt.Fprintf(a.Writer, "%s %s\n\n", "Incorrect Usage.", err.Error())
-		ShowSubcommandHelp(context)
+		_, _ = fmt.Fprintf(a.Writer, "%s %s\n\n", "Incorrect Usage.", err.Error())
+		_ = ShowSubcommandHelp(context)
 		return err
 	}
 
@@ -350,11 +390,17 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 		}
 	}
 
+	cerr := checkRequiredFlags(a.Flags, context)
+	if cerr != nil {
+		_ = ShowSubcommandHelp(context)
+		return cerr
+	}
+
 	if a.After != nil {
 		defer func() {
 			afterErr := a.After(context)
 			if afterErr != nil {
-				HandleExitCoder(err)
+				a.handleExitCoder(context, err)
 				if err != nil {
 					err = newMultiError(err, afterErr)
 				} else {
@@ -367,7 +413,7 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 	if a.Before != nil {
 		beforeErr := a.Before(context)
 		if beforeErr != nil {
-			HandleExitCoder(beforeErr)
+			a.handleExitCoder(context, beforeErr)
 			err = beforeErr
 			return err
 		}
@@ -385,7 +431,7 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 	// Run default Action
 	err = a.Action(context)
 
-	HandleExitCoder(err)
+	a.handleExitCoder(context, err)
 	return err
 }
 
@@ -404,7 +450,7 @@ func (a *App) Command(name string) *Command {
 // Hidden=false
 func (a *App) VisibleCategories() []CommandCategory {
 	ret := []CommandCategory{}
-	for _, category := range a.Categories.Categories() {
+	for _, category := range a.categories.Categories() {
 		if visible := func() CommandCategory {
 			if len(category.VisibleCommands()) > 0 {
 				return category
@@ -419,7 +465,7 @@ func (a *App) VisibleCategories() []CommandCategory {
 
 // VisibleCommands returns a slice of the Commands with Hidden=false
 func (a *App) VisibleCommands() []*Command {
-	ret := []*Command{}
+	var ret []*Command
 	for _, command := range a.Commands {
 		if !command.Hidden {
 			ret = append(ret, command)
@@ -433,18 +479,7 @@ func (a *App) VisibleFlags() []Flag {
 	return visibleFlags(a.Flags)
 }
 
-func (a *App) hasFlag(flag Flag) bool {
-	for _, f := range a.Flags {
-		if reflect.DeepEqual(flag, f) {
-			return true
-		}
-	}
-
-	return false
-}
-
 func (a *App) errWriter() io.Writer {
-
 	// When the app ErrWriter is nil use the package level one.
 	if a.ErrWriter == nil {
 		return ErrWriter
@@ -465,6 +500,14 @@ func (a *App) appendCommand(c *Command) {
 	}
 }
 
+func (a *App) handleExitCoder(context *Context, err error) {
+	if a.ExitErrHandler != nil {
+		a.ExitErrHandler(context, err)
+	} else {
+		HandleExitCoder(err)
+	}
+}
+
 // Author represents someone who has contributed to a cli project.
 type Author struct {
 	Name  string // The Authors name
@@ -480,3 +523,20 @@ func (a *Author) String() string {
 
 	return fmt.Sprintf("%v%v", a.Name, e)
 }
+
+// HandleAction attempts to figure out which Action signature was used.  If
+// it's an ActionFunc or a func with the legacy signature for Action, the func
+// is run!
+func HandleAction(action interface{}, context *Context) (err error) {
+	switch a := action.(type) {
+	case ActionFunc:
+		return a(context)
+	case func(*Context) error:
+		return a(context)
+	case func(*Context): // deprecated function signature
+		a(context)
+		return nil
+	}
+
+	return errInvalidActionType
+}
diff --git a/vendor/gopkg.in/urfave/cli.v2/args.go b/vendor/github.com/urfave/cli/v2/args.go
similarity index 91%
rename from vendor/gopkg.in/urfave/cli.v2/args.go
rename to vendor/github.com/urfave/cli/v2/args.go
index 5618a47b..bd65c17b 100644
--- a/vendor/gopkg.in/urfave/cli.v2/args.go
+++ b/vendor/github.com/urfave/cli/v2/args.go
@@ -1,11 +1,5 @@
 package cli
 
-import "errors"
-
-var (
-	argsRangeErr = errors.New("index out of range")
-)
-
 type Args interface {
 	// Get returns the nth argument, or else a blank string
 	Get(n int) string
@@ -55,6 +49,6 @@ func (a *args) Present() bool {
 
 func (a *args) Slice() []string {
 	ret := make([]string, len(*a))
-	copy(ret, []string(*a))
+	copy(ret, *a)
 	return ret
 }
diff --git a/vendor/gopkg.in/urfave/cli.v2/category.go b/vendor/github.com/urfave/cli/v2/category.go
similarity index 84%
rename from vendor/gopkg.in/urfave/cli.v2/category.go
rename to vendor/github.com/urfave/cli/v2/category.go
index 3b405c0f..867e3908 100644
--- a/vendor/gopkg.in/urfave/cli.v2/category.go
+++ b/vendor/github.com/urfave/cli/v2/category.go
@@ -1,9 +1,10 @@
 package cli
 
+// CommandCategories interface allows for category manipulation
 type CommandCategories interface {
 	// AddCommand adds a command to a category, creating a new category if necessary.
 	AddCommand(category string, command *Command)
-	// Categories returns a copy of the category slice
+	// categories returns a copy of the category slice
 	Categories() []CommandCategory
 }
 
@@ -15,7 +16,7 @@ func newCommandCategories() CommandCategories {
 }
 
 func (c *commandCategories) Less(i, j int) bool {
-	return (*c)[i].Name() < (*c)[j].Name()
+	return lexicographicLess((*c)[i].Name(), (*c)[j].Name())
 }
 
 func (c *commandCategories) Len() int {
@@ -33,9 +34,9 @@ func (c *commandCategories) AddCommand(category string, command *Command) {
 			return
 		}
 	}
-	newVal := commandCategories(append(*c,
-		&commandCategory{name: category, commands: []*Command{command}}))
-	(*c) = newVal
+	newVal := append(*c,
+		&commandCategory{name: category, commands: []*Command{command}})
+	*c = newVal
 }
 
 func (c *commandCategories) Categories() []CommandCategory {
@@ -59,13 +60,6 @@ type commandCategory struct {
 	commands []*Command
 }
 
-func newCommandCategory(name string) *commandCategory {
-	return &commandCategory{
-		name:     name,
-		commands: []*Command{},
-	}
-}
-
 func (c *commandCategory) Name() string {
 	return c.name
 }
@@ -75,7 +69,7 @@ func (c *commandCategory) VisibleCommands() []*Command {
 		c.commands = []*Command{}
 	}
 
-	ret := []*Command{}
+	var ret []*Command
 	for _, command := range c.commands {
 		if !command.Hidden {
 			ret = append(ret, command)
diff --git a/vendor/gopkg.in/urfave/cli.v2/cli.go b/vendor/github.com/urfave/cli/v2/cli.go
similarity index 87%
rename from vendor/gopkg.in/urfave/cli.v2/cli.go
rename to vendor/github.com/urfave/cli/v2/cli.go
index 81fc7ab4..62a5bc22 100644
--- a/vendor/gopkg.in/urfave/cli.v2/cli.go
+++ b/vendor/github.com/urfave/cli/v2/cli.go
@@ -20,4 +20,4 @@
 //   }
 package cli
 
-//go:generate python ./generate-flag-types cli -i flag-types.json -o flag_generated.go
+//go:generate go run flag-gen/main.go flag-gen/assets_vfsdata.go
diff --git a/vendor/gopkg.in/urfave/cli.v2/command.go b/vendor/github.com/urfave/cli/v2/command.go
similarity index 69%
rename from vendor/gopkg.in/urfave/cli.v2/command.go
rename to vendor/github.com/urfave/cli/v2/command.go
index 4f0d142f..95840f32 100644
--- a/vendor/gopkg.in/urfave/cli.v2/command.go
+++ b/vendor/github.com/urfave/cli/v2/command.go
@@ -1,8 +1,8 @@
 package cli
 
 import (
+	"flag"
 	"fmt"
-	"io/ioutil"
 	"sort"
 	"strings"
 )
@@ -23,8 +23,8 @@ type Command struct {
 	ArgsUsage string
 	// The category the command is part of
 	Category string
-	// The function to call when checking for shell command completions
-	ShellComplete ShellCompleteFunc
+	// The function to call when checking for bash command completions
+	BashComplete BashCompleteFunc
 	// An action to execute before any sub-subcommands are run, but after the context is ready
 	// If a non-nil error is returned, no sub-subcommands are run
 	Before BeforeFunc
@@ -41,10 +41,17 @@ type Command struct {
 	Flags []Flag
 	// Treat all flags as normal arguments if true
 	SkipFlagParsing bool
-	// Boolean to hide built-in help command
+	// Boolean to hide built-in help command and help flag
 	HideHelp bool
+	// Boolean to hide built-in help command but keep help flag
+	// Ignored if HideHelp is true.
+	HideHelpCommand bool
 	// Boolean to hide this command from help or completion
 	Hidden bool
+	// Boolean to enable short-option handling so user can combine several
+	// single-character bool arguments into one
+	// i.e. foobar -o -v -> foobar -ov
+	UseShortOptionHandling bool
 
 	// Full name of command for help, defaults to full command name, including parent commands.
 	HelpName        string
@@ -56,6 +63,8 @@ type Command struct {
 	CustomHelpTemplate string
 }
 
+type Commands []*Command
+
 type CommandsByName []*Command
 
 func (c CommandsByName) Len() int {
@@ -63,7 +72,7 @@ func (c CommandsByName) Len() int {
 }
 
 func (c CommandsByName) Less(i, j int) bool {
-	return c[i].Name < c[j].Name
+	return lexicographicLess(c[i].Name, c[j].Name)
 }
 
 func (c CommandsByName) Swap(i, j int) {
@@ -90,29 +99,11 @@ func (c *Command) Run(ctx *Context) (err error) {
 		c.appendFlag(HelpFlag)
 	}
 
-	if ctx.App.EnableShellCompletion {
-		c.appendFlag(GenerateCompletionFlag)
+	if ctx.App.UseShortOptionHandling {
+		c.UseShortOptionHandling = true
 	}
 
-	set, err := flagSet(c.Name, c.Flags)
-	if err != nil {
-		return err
-	}
-	set.SetOutput(ioutil.Discard)
-
-	if c.SkipFlagParsing {
-		err = set.Parse(append([]string{"--"}, ctx.Args().Tail()...))
-	} else {
-		err = set.Parse(ctx.Args().Tail())
-	}
-
-	nerr := normalizeFlags(c.Flags, set)
-	if nerr != nil {
-		fmt.Fprintln(ctx.App.Writer, nerr)
-		fmt.Fprintln(ctx.App.Writer)
-		ShowCommandHelp(ctx, c.Name)
-		return nerr
-	}
+	set, err := c.parseFlags(ctx.Args(), ctx.shellComplete)
 
 	context := NewContext(ctx.App, set, ctx)
 	context.Command = c
@@ -122,13 +113,13 @@ func (c *Command) Run(ctx *Context) (err error) {
 
 	if err != nil {
 		if c.OnUsageError != nil {
-			err := c.OnUsageError(context, err, false)
-			HandleExitCoder(err)
+			err = c.OnUsageError(context, err, false)
+			context.App.handleExitCoder(context, err)
 			return err
 		}
-		fmt.Fprintln(context.App.Writer, "Incorrect Usage:", err.Error())
-		fmt.Fprintln(context.App.Writer)
-		ShowCommandHelp(context, c.Name)
+		_, _ = fmt.Fprintln(context.App.Writer, "Incorrect Usage:", err.Error())
+		_, _ = fmt.Fprintln(context.App.Writer)
+		_ = ShowCommandHelp(context, c.Name)
 		return err
 	}
 
@@ -136,11 +127,17 @@ func (c *Command) Run(ctx *Context) (err error) {
 		return nil
 	}
 
+	cerr := checkRequiredFlags(c.Flags, context)
+	if cerr != nil {
+		_ = ShowCommandHelp(context, c.Name)
+		return cerr
+	}
+
 	if c.After != nil {
 		defer func() {
 			afterErr := c.After(context)
 			if afterErr != nil {
-				HandleExitCoder(err)
+				context.App.handleExitCoder(context, err)
 				if err != nil {
 					err = newMultiError(err, afterErr)
 				} else {
@@ -153,8 +150,8 @@ func (c *Command) Run(ctx *Context) (err error) {
 	if c.Before != nil {
 		err = c.Before(context)
 		if err != nil {
-			ShowCommandHelp(context, c.Name)
-			HandleExitCoder(err)
+			_ = ShowCommandHelp(context, c.Name)
+			context.App.handleExitCoder(context, err)
 			return err
 		}
 	}
@@ -167,11 +164,42 @@ func (c *Command) Run(ctx *Context) (err error) {
 	err = c.Action(context)
 
 	if err != nil {
-		HandleExitCoder(err)
+		context.App.handleExitCoder(context, err)
 	}
 	return err
 }
 
+func (c *Command) newFlagSet() (*flag.FlagSet, error) {
+	return flagSet(c.Name, c.Flags)
+}
+
+func (c *Command) useShortOptionHandling() bool {
+	return c.UseShortOptionHandling
+}
+
+func (c *Command) parseFlags(args Args, shellComplete bool) (*flag.FlagSet, error) {
+	set, err := c.newFlagSet()
+	if err != nil {
+		return nil, err
+	}
+
+	if c.SkipFlagParsing {
+		return set, set.Parse(append([]string{"--"}, args.Tail()...))
+	}
+
+	err = parseIter(set, c, args.Tail(), shellComplete)
+	if err != nil {
+		return nil, err
+	}
+
+	err = normalizeFlags(c.Flags, set)
+	if err != nil {
+		return nil, err
+	}
+
+	return set, nil
+}
+
 // Names returns the names including short names and aliases.
 func (c *Command) Names() []string {
 	return append([]string{c.Name}, c.Aliases...)
@@ -211,24 +239,27 @@ func (c *Command) startApp(ctx *Context) error {
 	app.Commands = c.Subcommands
 	app.Flags = c.Flags
 	app.HideHelp = c.HideHelp
+	app.HideHelpCommand = c.HideHelpCommand
 
 	app.Version = ctx.App.Version
 	app.HideVersion = ctx.App.HideVersion
 	app.Compiled = ctx.App.Compiled
 	app.Writer = ctx.App.Writer
 	app.ErrWriter = ctx.App.ErrWriter
+	app.ExitErrHandler = ctx.App.ExitErrHandler
+	app.UseShortOptionHandling = ctx.App.UseShortOptionHandling
 
-	app.Categories = newCommandCategories()
+	app.categories = newCommandCategories()
 	for _, command := range c.Subcommands {
-		app.Categories.AddCommand(command.Category, command)
+		app.categories.AddCommand(command.Category, command)
 	}
 
-	sort.Sort(app.Categories.(*commandCategories))
+	sort.Sort(app.categories.(*commandCategories))
 
 	// bash completion
-	app.EnableShellCompletion = ctx.App.EnableShellCompletion
-	if c.ShellComplete != nil {
-		app.ShellComplete = c.ShellComplete
+	app.EnableBashCompletion = ctx.App.EnableBashCompletion
+	if c.BashComplete != nil {
+		app.BashComplete = c.BashComplete
 	}
 
 	// set the actions
diff --git a/vendor/gopkg.in/urfave/cli.v2/context.go b/vendor/github.com/urfave/cli/v2/context.go
similarity index 66%
rename from vendor/gopkg.in/urfave/cli.v2/context.go
rename to vendor/github.com/urfave/cli/v2/context.go
index 9802594a..74ed5191 100644
--- a/vendor/gopkg.in/urfave/cli.v2/context.go
+++ b/vendor/github.com/urfave/cli/v2/context.go
@@ -1,10 +1,10 @@
 package cli
 
 import (
+	"context"
 	"errors"
 	"flag"
-	"os"
-	"reflect"
+	"fmt"
 	"strings"
 )
 
@@ -13,10 +13,10 @@ import (
 // can be used to retrieve context-specific args and
 // parsed command-line options.
 type Context struct {
+	context.Context
 	App           *App
 	Command       *Command
 	shellComplete bool
-
 	flagSet       *flag.FlagSet
 	parentContext *Context
 }
@@ -24,9 +24,18 @@ type Context struct {
 // NewContext creates a new context. For use in when invoking an App or Command action.
 func NewContext(app *App, set *flag.FlagSet, parentCtx *Context) *Context {
 	c := &Context{App: app, flagSet: set, parentContext: parentCtx}
-
 	if parentCtx != nil {
+		c.Context = parentCtx.Context
 		c.shellComplete = parentCtx.shellComplete
+		if parentCtx.flagSet == nil {
+			parentCtx.flagSet = &flag.FlagSet{}
+		}
+	}
+
+	c.Command = &Command{}
+
+	if c.Context == nil {
+		c.Context = context.Background()
 	}
 
 	return c
@@ -45,48 +54,24 @@ func (c *Context) Set(name, value string) error {
 // IsSet determines if the flag was actually set
 func (c *Context) IsSet(name string) bool {
 	if fs := lookupFlagSet(name, c); fs != nil {
-		isSet := false
-		fs.Visit(func(f *flag.Flag) {
-			if f.Name == name {
-				isSet = true
+		if fs := lookupFlagSet(name, c); fs != nil {
+			isSet := false
+			fs.Visit(func(f *flag.Flag) {
+				if f.Name == name {
+					isSet = true
+				}
+			})
+			if isSet {
+				return true
 			}
-		})
-		if isSet {
-			return true
 		}
-	}
 
-	// XXX hack to support IsSet for flags with EnvVar
-	//
-	// There isn't an easy way to do this with the current implementation since
-	// whether a flag was set via an environment variable is very difficult to
-	// determine here. Instead, we intend to introduce a backwards incompatible
-	// change in version 2 to add `IsSet` to the Flag interface to push the
-	// responsibility closer to where the information required to determine
-	// whether a flag is set by non-standard means such as environment
-	// variables is avaliable.
-	//
-	// See https://github.com/urfave/cli/issues/294 for additional discussion
-	f := lookupFlag(name, c)
-	if f == nil {
-		return false
-	}
-
-	val := reflect.ValueOf(f)
-	if val.Kind() == reflect.Ptr {
-		val = val.Elem()
-	}
-
-	envVarValues := val.FieldByName("EnvVars")
-	if !envVarValues.IsValid() {
-		return false
-	}
-
-	for _, envVar := range envVarValues.Interface().([]string) {
-		envVar = strings.TrimSpace(envVar)
-		if envVal := os.Getenv(envVar); envVal != "" {
-			return true
+		f := lookupFlag(name, c)
+		if f == nil {
+			return false
 		}
+
+		return f.IsSet()
 	}
 
 	return false
@@ -94,7 +79,7 @@ func (c *Context) IsSet(name string) bool {
 
 // LocalFlagNames returns a slice of flag names used in this context.
 func (c *Context) LocalFlagNames() []string {
-	names := []string{}
+	var names []string
 	c.flagSet.Visit(makeFlagNameVisitor(&names))
 	return names
 }
@@ -102,7 +87,7 @@ func (c *Context) LocalFlagNames() []string {
 // FlagNames returns a slice of flag names used by the this context and all of
 // its parent contexts.
 func (c *Context) FlagNames() []string {
-	names := []string{}
+	var names []string
 	for _, ctx := range c.Lineage() {
 		ctx.flagSet.Visit(makeFlagNameVisitor(&names))
 	}
@@ -112,7 +97,7 @@ func (c *Context) FlagNames() []string {
 // Lineage returns *this* context and all of its ancestor contexts in order from
 // child to parent
 func (c *Context) Lineage() []*Context {
-	lineage := []*Context{}
+	var lineage []*Context
 
 	for cur := c; cur != nil; cur = cur.parentContext {
 		lineage = append(lineage, cur)
@@ -121,8 +106,8 @@ func (c *Context) Lineage() []*Context {
 	return lineage
 }
 
-// value returns the value of the flag corresponding to `name`
-func (c *Context) value(name string) interface{} {
+// Value returns the value of the flag corresponding to `name`
+func (c *Context) Value(name string) interface{} {
 	return c.flagSet.Lookup(name).Value.(flag.Getter).Get()
 }
 
@@ -177,10 +162,10 @@ func lookupFlagSet(name string, ctx *Context) *flag.FlagSet {
 
 func copyFlag(name string, ff *flag.Flag, set *flag.FlagSet) {
 	switch ff.Value.(type) {
-	case Serializeder:
-		set.Set(name, ff.Value.(Serializeder).Serialized())
+	case Serializer:
+		_ = set.Set(name, ff.Value.(Serializer).Serialize())
 	default:
-		set.Set(name, ff.Value.String())
+		_ = set.Set(name, ff.Value.String())
 	}
 }
 
@@ -230,7 +215,59 @@ func makeFlagNameVisitor(names *[]string) func(*flag.Flag) {
 		}
 
 		if name != "" {
-			(*names) = append(*names, name)
+			*names = append(*names, name)
 		}
 	}
 }
+
+type requiredFlagsErr interface {
+	error
+	getMissingFlags() []string
+}
+
+type errRequiredFlags struct {
+	missingFlags []string
+}
+
+func (e *errRequiredFlags) Error() string {
+	numberOfMissingFlags := len(e.missingFlags)
+	if numberOfMissingFlags == 1 {
+		return fmt.Sprintf("Required flag %q not set", e.missingFlags[0])
+	}
+	joinedMissingFlags := strings.Join(e.missingFlags, ", ")
+	return fmt.Sprintf("Required flags %q not set", joinedMissingFlags)
+}
+
+func (e *errRequiredFlags) getMissingFlags() []string {
+	return e.missingFlags
+}
+
+func checkRequiredFlags(flags []Flag, context *Context) requiredFlagsErr {
+	var missingFlags []string
+	for _, f := range flags {
+		if rf, ok := f.(RequiredFlag); ok && rf.IsRequired() {
+			var flagPresent bool
+			var flagName string
+
+			for _, key := range f.Names() {
+				if len(key) > 1 {
+					flagName = key
+				}
+
+				if context.IsSet(strings.TrimSpace(key)) {
+					flagPresent = true
+				}
+			}
+
+			if !flagPresent && flagName != "" {
+				missingFlags = append(missingFlags, flagName)
+			}
+		}
+	}
+
+	if len(missingFlags) != 0 {
+		return &errRequiredFlags{missingFlags: missingFlags}
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/urfave/cli/v2/docs.go b/vendor/github.com/urfave/cli/v2/docs.go
new file mode 100644
index 00000000..dc16fc82
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/docs.go
@@ -0,0 +1,148 @@
+package cli
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"sort"
+	"strings"
+	"text/template"
+
+	"github.com/cpuguy83/go-md2man/v2/md2man"
+)
+
+// ToMarkdown creates a markdown string for the `*App`
+// The function errors if either parsing or writing of the string fails.
+func (a *App) ToMarkdown() (string, error) {
+	var w bytes.Buffer
+	if err := a.writeDocTemplate(&w); err != nil {
+		return "", err
+	}
+	return w.String(), nil
+}
+
+// ToMan creates a man page string for the `*App`
+// The function errors if either parsing or writing of the string fails.
+func (a *App) ToMan() (string, error) {
+	var w bytes.Buffer
+	if err := a.writeDocTemplate(&w); err != nil {
+		return "", err
+	}
+	man := md2man.Render(w.Bytes())
+	return string(man), nil
+}
+
+type cliTemplate struct {
+	App          *App
+	Commands     []string
+	GlobalArgs   []string
+	SynopsisArgs []string
+}
+
+func (a *App) writeDocTemplate(w io.Writer) error {
+	const name = "cli"
+	t, err := template.New(name).Parse(MarkdownDocTemplate)
+	if err != nil {
+		return err
+	}
+	return t.ExecuteTemplate(w, name, &cliTemplate{
+		App:          a,
+		Commands:     prepareCommands(a.Commands, 0),
+		GlobalArgs:   prepareArgsWithValues(a.VisibleFlags()),
+		SynopsisArgs: prepareArgsSynopsis(a.VisibleFlags()),
+	})
+}
+
+func prepareCommands(commands []*Command, level int) []string {
+	var coms []string
+	for _, command := range commands {
+		if command.Hidden {
+			continue
+		}
+		usage := ""
+		if command.Usage != "" {
+			usage = command.Usage
+		}
+
+		prepared := fmt.Sprintf("%s %s\n\n%s\n",
+			strings.Repeat("#", level+2),
+			strings.Join(command.Names(), ", "),
+			usage,
+		)
+
+		flags := prepareArgsWithValues(command.Flags)
+		if len(flags) > 0 {
+			prepared += fmt.Sprintf("\n%s", strings.Join(flags, "\n"))
+		}
+
+		coms = append(coms, prepared)
+
+		// recursevly iterate subcommands
+		if len(command.Subcommands) > 0 {
+			coms = append(
+				coms,
+				prepareCommands(command.Subcommands, level+1)...,
+			)
+		}
+	}
+
+	return coms
+}
+
+func prepareArgsWithValues(flags []Flag) []string {
+	return prepareFlags(flags, ", ", "**", "**", `""`, true)
+}
+
+func prepareArgsSynopsis(flags []Flag) []string {
+	return prepareFlags(flags, "|", "[", "]", "[value]", false)
+}
+
+func prepareFlags(
+	flags []Flag,
+	sep, opener, closer, value string,
+	addDetails bool,
+) []string {
+	args := []string{}
+	for _, f := range flags {
+		flag, ok := f.(DocGenerationFlag)
+		if !ok {
+			continue
+		}
+		modifiedArg := opener
+
+		for _, s := range flag.Names() {
+			trimmed := strings.TrimSpace(s)
+			if len(modifiedArg) > len(opener) {
+				modifiedArg += sep
+			}
+			if len(trimmed) > 1 {
+				modifiedArg += fmt.Sprintf("--%s", trimmed)
+			} else {
+				modifiedArg += fmt.Sprintf("-%s", trimmed)
+			}
+		}
+		modifiedArg += closer
+		if flag.TakesValue() {
+			modifiedArg += fmt.Sprintf("=%s", value)
+		}
+
+		if addDetails {
+			modifiedArg += flagDetails(flag)
+		}
+
+		args = append(args, modifiedArg+"\n")
+
+	}
+	sort.Strings(args)
+	return args
+}
+
+// flagDetails returns a string containing the flags metadata
+func flagDetails(flag DocGenerationFlag) string {
+	description := flag.GetUsage()
+	value := flag.GetValue()
+	if value != "" {
+		description += " (default: " + value + ")"
+	}
+	return ": " + description
+}
diff --git a/vendor/gopkg.in/urfave/cli.v2/errors.go b/vendor/github.com/urfave/cli/v2/errors.go
similarity index 89%
rename from vendor/gopkg.in/urfave/cli.v2/errors.go
rename to vendor/github.com/urfave/cli/v2/errors.go
index 62596991..344b4361 100644
--- a/vendor/gopkg.in/urfave/cli.v2/errors.go
+++ b/vendor/github.com/urfave/cli/v2/errors.go
@@ -48,6 +48,7 @@ func (m *multiError) Errors() []error {
 	return errs
 }
 
+// ErrorFormatter is the interface that will suitably format the error output
 type ErrorFormatter interface {
 	Format(s fmt.State, verb rune)
 }
@@ -64,12 +65,17 @@ type exitError struct {
 	message  interface{}
 }
 
+// NewExitError makes a new *exitError
+func NewExitError(message interface{}, exitCode int) ExitCoder {
+	return Exit(message, exitCode)
+}
+
 // Exit wraps a message and exit code into an ExitCoder suitable for handling by
 // HandleExitCoder
 func Exit(message interface{}, exitCode int) ExitCoder {
 	return &exitError{
-		exitCode: exitCode,
 		message:  message,
+		exitCode: exitCode,
 	}
 }
 
@@ -93,9 +99,9 @@ func HandleExitCoder(err error) {
 	if exitErr, ok := err.(ExitCoder); ok {
 		if err.Error() != "" {
 			if _, ok := exitErr.(ErrorFormatter); ok {
-				fmt.Fprintf(ErrWriter, "%+v\n", err)
+				_, _ = fmt.Fprintf(ErrWriter, "%+v\n", err)
 			} else {
-				fmt.Fprintln(ErrWriter, err)
+				_, _ = fmt.Fprintln(ErrWriter, err)
 			}
 		}
 		OsExiter(exitErr.ExitCode())
diff --git a/vendor/github.com/urfave/cli/v2/fish.go b/vendor/github.com/urfave/cli/v2/fish.go
new file mode 100644
index 00000000..67122c9f
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/fish.go
@@ -0,0 +1,192 @@
+package cli
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strings"
+	"text/template"
+)
+
+// ToFishCompletion creates a fish completion string for the `*App`
+// The function errors if either parsing or writing of the string fails.
+func (a *App) ToFishCompletion() (string, error) {
+	var w bytes.Buffer
+	if err := a.writeFishCompletionTemplate(&w); err != nil {
+		return "", err
+	}
+	return w.String(), nil
+}
+
+type fishCompletionTemplate struct {
+	App         *App
+	Completions []string
+	AllCommands []string
+}
+
+func (a *App) writeFishCompletionTemplate(w io.Writer) error {
+	const name = "cli"
+	t, err := template.New(name).Parse(FishCompletionTemplate)
+	if err != nil {
+		return err
+	}
+	allCommands := []string{}
+
+	// Add global flags
+	completions := a.prepareFishFlags(a.VisibleFlags(), allCommands)
+
+	// Add help flag
+	if !a.HideHelp {
+		completions = append(
+			completions,
+			a.prepareFishFlags([]Flag{HelpFlag}, allCommands)...,
+		)
+	}
+
+	// Add version flag
+	if !a.HideVersion {
+		completions = append(
+			completions,
+			a.prepareFishFlags([]Flag{VersionFlag}, allCommands)...,
+		)
+	}
+
+	// Add commands and their flags
+	completions = append(
+		completions,
+		a.prepareFishCommands(a.VisibleCommands(), &allCommands, []string{})...,
+	)
+
+	return t.ExecuteTemplate(w, name, &fishCompletionTemplate{
+		App:         a,
+		Completions: completions,
+		AllCommands: allCommands,
+	})
+}
+
+func (a *App) prepareFishCommands(commands []*Command, allCommands *[]string, previousCommands []string) []string {
+	completions := []string{}
+	for _, command := range commands {
+		if command.Hidden {
+			continue
+		}
+
+		var completion strings.Builder
+		completion.WriteString(fmt.Sprintf(
+			"complete -r -c %s -n '%s' -a '%s'",
+			a.Name,
+			a.fishSubcommandHelper(previousCommands),
+			strings.Join(command.Names(), " "),
+		))
+
+		if command.Usage != "" {
+			completion.WriteString(fmt.Sprintf(" -d '%s'",
+				escapeSingleQuotes(command.Usage)))
+		}
+
+		if !command.HideHelp {
+			completions = append(
+				completions,
+				a.prepareFishFlags([]Flag{HelpFlag}, command.Names())...,
+			)
+		}
+
+		*allCommands = append(*allCommands, command.Names()...)
+		completions = append(completions, completion.String())
+		completions = append(
+			completions,
+			a.prepareFishFlags(command.Flags, command.Names())...,
+		)
+
+		// recursevly iterate subcommands
+		if len(command.Subcommands) > 0 {
+			completions = append(
+				completions,
+				a.prepareFishCommands(
+					command.Subcommands, allCommands, command.Names(),
+				)...,
+			)
+		}
+	}
+
+	return completions
+}
+
+func (a *App) prepareFishFlags(flags []Flag, previousCommands []string) []string {
+	completions := []string{}
+	for _, f := range flags {
+		flag, ok := f.(DocGenerationFlag)
+		if !ok {
+			continue
+		}
+
+		completion := &strings.Builder{}
+		completion.WriteString(fmt.Sprintf(
+			"complete -c %s -n '%s'",
+			a.Name,
+			a.fishSubcommandHelper(previousCommands),
+		))
+
+		fishAddFileFlag(f, completion)
+
+		for idx, opt := range flag.Names() {
+			if idx == 0 {
+				completion.WriteString(fmt.Sprintf(
+					" -l %s", strings.TrimSpace(opt),
+				))
+			} else {
+				completion.WriteString(fmt.Sprintf(
+					" -s %s", strings.TrimSpace(opt),
+				))
+
+			}
+		}
+
+		if flag.TakesValue() {
+			completion.WriteString(" -r")
+		}
+
+		if flag.GetUsage() != "" {
+			completion.WriteString(fmt.Sprintf(" -d '%s'",
+				escapeSingleQuotes(flag.GetUsage())))
+		}
+
+		completions = append(completions, completion.String())
+	}
+
+	return completions
+}
+
+func fishAddFileFlag(flag Flag, completion *strings.Builder) {
+	switch f := flag.(type) {
+	case *GenericFlag:
+		if f.TakesFile {
+			return
+		}
+	case *StringFlag:
+		if f.TakesFile {
+			return
+		}
+	case *StringSliceFlag:
+		if f.TakesFile {
+			return
+		}
+	}
+	completion.WriteString(" -f")
+}
+
+func (a *App) fishSubcommandHelper(allCommands []string) string {
+	fishHelper := fmt.Sprintf("__fish_%s_no_subcommand", a.Name)
+	if len(allCommands) > 0 {
+		fishHelper = fmt.Sprintf(
+			"__fish_seen_subcommand_from %s",
+			strings.Join(allCommands, " "),
+		)
+	}
+	return fishHelper
+
+}
+
+func escapeSingleQuotes(input string) string {
+	return strings.Replace(input, `'`, `\'`, -1)
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag.go b/vendor/github.com/urfave/cli/v2/flag.go
new file mode 100644
index 00000000..ad97c2d0
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag.go
@@ -0,0 +1,388 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"reflect"
+	"regexp"
+	"runtime"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+)
+
+const defaultPlaceholder = "value"
+
+var (
+	slPfx = fmt.Sprintf("sl:::%d:::", time.Now().UTC().UnixNano())
+
+	commaWhitespace = regexp.MustCompile("[, ]+.*")
+)
+
+// BashCompletionFlag enables bash-completion for all commands and subcommands
+var BashCompletionFlag Flag = &BoolFlag{
+	Name:   "generate-bash-completion",
+	Hidden: true,
+}
+
+// VersionFlag prints the version for the application
+var VersionFlag Flag = &BoolFlag{
+	Name:    "version",
+	Aliases: []string{"v"},
+	Usage:   "print the version",
+}
+
+// HelpFlag prints the help for all commands and subcommands.
+// Set to nil to disable the flag.  The subcommand
+// will still be added unless HideHelp or HideHelpCommand is set to true.
+var HelpFlag Flag = &BoolFlag{
+	Name:    "help",
+	Aliases: []string{"h"},
+	Usage:   "show help",
+}
+
+// FlagStringer converts a flag definition to a string. This is used by help
+// to display a flag.
+var FlagStringer FlagStringFunc = stringifyFlag
+
+// Serializer is used to circumvent the limitations of flag.FlagSet.Set
+type Serializer interface {
+	Serialize() string
+}
+
+// FlagNamePrefixer converts a full flag name and its placeholder into the help
+// message flag prefix. This is used by the default FlagStringer.
+var FlagNamePrefixer FlagNamePrefixFunc = prefixedNames
+
+// FlagEnvHinter annotates flag help message with the environment variable
+// details. This is used by the default FlagStringer.
+var FlagEnvHinter FlagEnvHintFunc = withEnvHint
+
+// FlagFileHinter annotates flag help message with the environment variable
+// details. This is used by the default FlagStringer.
+var FlagFileHinter FlagFileHintFunc = withFileHint
+
+// FlagsByName is a slice of Flag.
+type FlagsByName []Flag
+
+func (f FlagsByName) Len() int {
+	return len(f)
+}
+
+func (f FlagsByName) Less(i, j int) bool {
+	if len(f[j].Names()) == 0 {
+		return false
+	} else if len(f[i].Names()) == 0 {
+		return true
+	}
+	return lexicographicLess(f[i].Names()[0], f[j].Names()[0])
+}
+
+func (f FlagsByName) Swap(i, j int) {
+	f[i], f[j] = f[j], f[i]
+}
+
+// Flag is a common interface related to parsing flags in cli.
+// For more advanced flag parsing techniques, it is recommended that
+// this interface be implemented.
+type Flag interface {
+	fmt.Stringer
+	// Apply Flag settings to the given flag set
+	Apply(*flag.FlagSet) error
+	Names() []string
+	IsSet() bool
+}
+
+// RequiredFlag is an interface that allows us to mark flags as required
+// it allows flags required flags to be backwards compatible with the Flag interface
+type RequiredFlag interface {
+	Flag
+
+	IsRequired() bool
+}
+
+// DocGenerationFlag is an interface that allows documentation generation for the flag
+type DocGenerationFlag interface {
+	Flag
+
+	// TakesValue returns true if the flag takes a value, otherwise false
+	TakesValue() bool
+
+	// GetUsage returns the usage string for the flag
+	GetUsage() string
+
+	// GetValue returns the flags value as string representation and an empty
+	// string if the flag takes no value at all.
+	GetValue() string
+}
+
+func flagSet(name string, flags []Flag) (*flag.FlagSet, error) {
+	set := flag.NewFlagSet(name, flag.ContinueOnError)
+
+	for _, f := range flags {
+		if err := f.Apply(set); err != nil {
+			return nil, err
+		}
+	}
+	set.SetOutput(ioutil.Discard)
+	return set, nil
+}
+
+func visibleFlags(fl []Flag) []Flag {
+	var visible []Flag
+	for _, f := range fl {
+		field := flagValue(f).FieldByName("Hidden")
+		if !field.IsValid() || !field.Bool() {
+			visible = append(visible, f)
+		}
+	}
+	return visible
+}
+
+func prefixFor(name string) (prefix string) {
+	if len(name) == 1 {
+		prefix = "-"
+	} else {
+		prefix = "--"
+	}
+
+	return
+}
+
+// Returns the placeholder, if any, and the unquoted usage string.
+func unquoteUsage(usage string) (string, string) {
+	for i := 0; i < len(usage); i++ {
+		if usage[i] == '`' {
+			for j := i + 1; j < len(usage); j++ {
+				if usage[j] == '`' {
+					name := usage[i+1 : j]
+					usage = usage[:i] + name + usage[j+1:]
+					return name, usage
+				}
+			}
+			break
+		}
+	}
+	return "", usage
+}
+
+func prefixedNames(names []string, placeholder string) string {
+	var prefixed string
+	for i, name := range names {
+		if name == "" {
+			continue
+		}
+
+		prefixed += prefixFor(name) + name
+		if placeholder != "" {
+			prefixed += " " + placeholder
+		}
+		if i < len(names)-1 {
+			prefixed += ", "
+		}
+	}
+	return prefixed
+}
+
+func withEnvHint(envVars []string, str string) string {
+	envText := ""
+	if envVars != nil && len(envVars) > 0 {
+		prefix := "$"
+		suffix := ""
+		sep := ", $"
+		if runtime.GOOS == "windows" {
+			prefix = "%"
+			suffix = "%"
+			sep = "%, %"
+		}
+
+		envText = fmt.Sprintf(" [%s%s%s]", prefix, strings.Join(envVars, sep), suffix)
+	}
+	return str + envText
+}
+
+func flagNames(name string, aliases []string) []string {
+	var ret []string
+
+	for _, part := range append([]string{name}, aliases...) {
+		// v1 -> v2 migration warning zone:
+		// Strip off anything after the first found comma or space, which
+		// *hopefully* makes it a tiny bit more obvious that unexpected behavior is
+		// caused by using the v1 form of stringly typed "Name".
+		ret = append(ret, commaWhitespace.ReplaceAllString(part, ""))
+	}
+
+	return ret
+}
+
+func flagStringSliceField(f Flag, name string) []string {
+	fv := flagValue(f)
+	field := fv.FieldByName(name)
+
+	if field.IsValid() {
+		return field.Interface().([]string)
+	}
+
+	return []string{}
+}
+
+func withFileHint(filePath, str string) string {
+	fileText := ""
+	if filePath != "" {
+		fileText = fmt.Sprintf(" [%s]", filePath)
+	}
+	return str + fileText
+}
+
+func flagValue(f Flag) reflect.Value {
+	fv := reflect.ValueOf(f)
+	for fv.Kind() == reflect.Ptr {
+		fv = reflect.Indirect(fv)
+	}
+	return fv
+}
+
+func formatDefault(format string) string {
+	return " (default: " + format + ")"
+}
+
+func stringifyFlag(f Flag) string {
+	fv := flagValue(f)
+
+	switch f := f.(type) {
+	case *IntSliceFlag:
+		return withEnvHint(flagStringSliceField(f, "EnvVars"),
+			stringifyIntSliceFlag(f))
+	case *Int64SliceFlag:
+		return withEnvHint(flagStringSliceField(f, "EnvVars"),
+			stringifyInt64SliceFlag(f))
+	case *Float64SliceFlag:
+		return withEnvHint(flagStringSliceField(f, "EnvVars"),
+			stringifyFloat64SliceFlag(f))
+	case *StringSliceFlag:
+		return withEnvHint(flagStringSliceField(f, "EnvVars"),
+			stringifyStringSliceFlag(f))
+	}
+
+	placeholder, usage := unquoteUsage(fv.FieldByName("Usage").String())
+
+	needsPlaceholder := false
+	defaultValueString := ""
+	val := fv.FieldByName("Value")
+	if val.IsValid() {
+		needsPlaceholder = val.Kind() != reflect.Bool
+		defaultValueString = fmt.Sprintf(formatDefault("%v"), val.Interface())
+
+		if val.Kind() == reflect.String && val.String() != "" {
+			defaultValueString = fmt.Sprintf(formatDefault("%q"), val.String())
+		}
+	}
+
+	helpText := fv.FieldByName("DefaultText")
+	if helpText.IsValid() && helpText.String() != "" {
+		needsPlaceholder = val.Kind() != reflect.Bool
+		defaultValueString = fmt.Sprintf(formatDefault("%s"), helpText.String())
+	}
+
+	if defaultValueString == formatDefault("") {
+		defaultValueString = ""
+	}
+
+	if needsPlaceholder && placeholder == "" {
+		placeholder = defaultPlaceholder
+	}
+
+	usageWithDefault := strings.TrimSpace(usage + defaultValueString)
+
+	return withEnvHint(flagStringSliceField(f, "EnvVars"),
+		fmt.Sprintf("%s\t%s", prefixedNames(f.Names(), placeholder), usageWithDefault))
+}
+
+func stringifyIntSliceFlag(f *IntSliceFlag) string {
+	var defaultVals []string
+	if f.Value != nil && len(f.Value.Value()) > 0 {
+		for _, i := range f.Value.Value() {
+			defaultVals = append(defaultVals, strconv.Itoa(i))
+		}
+	}
+
+	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
+}
+
+func stringifyInt64SliceFlag(f *Int64SliceFlag) string {
+	var defaultVals []string
+	if f.Value != nil && len(f.Value.Value()) > 0 {
+		for _, i := range f.Value.Value() {
+			defaultVals = append(defaultVals, strconv.FormatInt(i, 10))
+		}
+	}
+
+	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
+}
+
+func stringifyFloat64SliceFlag(f *Float64SliceFlag) string {
+	var defaultVals []string
+
+	if f.Value != nil && len(f.Value.Value()) > 0 {
+		for _, i := range f.Value.Value() {
+			defaultVals = append(defaultVals, strings.TrimRight(strings.TrimRight(fmt.Sprintf("%f", i), "0"), "."))
+		}
+	}
+
+	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
+}
+
+func stringifyStringSliceFlag(f *StringSliceFlag) string {
+	var defaultVals []string
+	if f.Value != nil && len(f.Value.Value()) > 0 {
+		for _, s := range f.Value.Value() {
+			if len(s) > 0 {
+				defaultVals = append(defaultVals, strconv.Quote(s))
+			}
+		}
+	}
+
+	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
+}
+
+func stringifySliceFlag(usage string, names, defaultVals []string) string {
+	placeholder, usage := unquoteUsage(usage)
+	if placeholder == "" {
+		placeholder = defaultPlaceholder
+	}
+
+	defaultVal := ""
+	if len(defaultVals) > 0 {
+		defaultVal = fmt.Sprintf(formatDefault("%s"), strings.Join(defaultVals, ", "))
+	}
+
+	usageWithDefault := strings.TrimSpace(fmt.Sprintf("%s%s", usage, defaultVal))
+	return fmt.Sprintf("%s\t%s", prefixedNames(names, placeholder), usageWithDefault)
+}
+
+func hasFlag(flags []Flag, fl Flag) bool {
+	for _, existing := range flags {
+		if fl == existing {
+			return true
+		}
+	}
+
+	return false
+}
+
+func flagFromEnvOrFile(envVars []string, filePath string) (val string, ok bool) {
+	for _, envVar := range envVars {
+		envVar = strings.TrimSpace(envVar)
+		if val, ok := syscall.Getenv(envVar); ok {
+			return val, true
+		}
+	}
+	for _, fileVar := range strings.Split(filePath, ",") {
+		if data, err := ioutil.ReadFile(fileVar); err == nil {
+			return string(data), true
+		}
+	}
+	return "", false
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_bool.go b/vendor/github.com/urfave/cli/v2/flag_bool.go
new file mode 100644
index 00000000..bc9ea35d
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_bool.go
@@ -0,0 +1,106 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"strconv"
+)
+
+// BoolFlag is a flag with type bool
+type BoolFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Value       bool
+	DefaultText string
+	Destination *bool
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *BoolFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *BoolFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *BoolFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *BoolFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *BoolFlag) TakesValue() bool {
+	return false
+}
+
+// GetUsage returns the usage string for the flag
+func (f *BoolFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *BoolFlag) GetValue() string {
+	return ""
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *BoolFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		if val != "" {
+			valBool, err := strconv.ParseBool(val)
+
+			if err != nil {
+				return fmt.Errorf("could not parse %q as bool value for flag %s: %s", val, f.Name, err)
+			}
+
+			f.Value = valBool
+			f.HasBeenSet = true
+		}
+	}
+
+	for _, name := range f.Names() {
+		if f.Destination != nil {
+			set.BoolVar(f.Destination, name, f.Value, f.Usage)
+			continue
+		}
+		set.Bool(name, f.Value, f.Usage)
+	}
+
+	return nil
+}
+
+// Bool looks up the value of a local BoolFlag, returns
+// false if not found
+func (c *Context) Bool(name string) bool {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupBool(name, fs)
+	}
+	return false
+}
+
+func lookupBool(name string, set *flag.FlagSet) bool {
+	f := set.Lookup(name)
+	if f != nil {
+		parsed, err := strconv.ParseBool(f.Value.String())
+		if err != nil {
+			return false
+		}
+		return parsed
+	}
+	return false
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_duration.go b/vendor/github.com/urfave/cli/v2/flag_duration.go
new file mode 100644
index 00000000..22a2e672
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_duration.go
@@ -0,0 +1,105 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"time"
+)
+
+// DurationFlag is a flag with type time.Duration (see https://golang.org/pkg/time/#ParseDuration)
+type DurationFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Value       time.Duration
+	DefaultText string
+	Destination *time.Duration
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *DurationFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *DurationFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *DurationFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *DurationFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *DurationFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *DurationFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *DurationFlag) GetValue() string {
+	return f.Value.String()
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *DurationFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		if val != "" {
+			valDuration, err := time.ParseDuration(val)
+
+			if err != nil {
+				return fmt.Errorf("could not parse %q as duration value for flag %s: %s", val, f.Name, err)
+			}
+
+			f.Value = valDuration
+			f.HasBeenSet = true
+		}
+	}
+
+	for _, name := range f.Names() {
+		if f.Destination != nil {
+			set.DurationVar(f.Destination, name, f.Value, f.Usage)
+			continue
+		}
+		set.Duration(name, f.Value, f.Usage)
+	}
+	return nil
+}
+
+// Duration looks up the value of a local DurationFlag, returns
+// 0 if not found
+func (c *Context) Duration(name string) time.Duration {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupDuration(name, fs)
+	}
+	return 0
+}
+
+func lookupDuration(name string, set *flag.FlagSet) time.Duration {
+	f := set.Lookup(name)
+	if f != nil {
+		parsed, err := time.ParseDuration(f.Value.String())
+		if err != nil {
+			return 0
+		}
+		return parsed
+	}
+	return 0
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_float64.go b/vendor/github.com/urfave/cli/v2/flag_float64.go
new file mode 100644
index 00000000..91c778c8
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_float64.go
@@ -0,0 +1,106 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"strconv"
+)
+
+// Float64Flag is a flag with type float64
+type Float64Flag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Value       float64
+	DefaultText string
+	Destination *float64
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *Float64Flag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *Float64Flag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *Float64Flag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *Float64Flag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *Float64Flag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *Float64Flag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *Float64Flag) GetValue() string {
+	return fmt.Sprintf("%f", f.Value)
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *Float64Flag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		if val != "" {
+			valFloat, err := strconv.ParseFloat(val, 10)
+
+			if err != nil {
+				return fmt.Errorf("could not parse %q as float64 value for flag %s: %s", val, f.Name, err)
+			}
+
+			f.Value = valFloat
+			f.HasBeenSet = true
+		}
+	}
+
+	for _, name := range f.Names() {
+		if f.Destination != nil {
+			set.Float64Var(f.Destination, name, f.Value, f.Usage)
+			continue
+		}
+		set.Float64(name, f.Value, f.Usage)
+	}
+
+	return nil
+}
+
+// Float64 looks up the value of a local Float64Flag, returns
+// 0 if not found
+func (c *Context) Float64(name string) float64 {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupFloat64(name, fs)
+	}
+	return 0
+}
+
+func lookupFloat64(name string, set *flag.FlagSet) float64 {
+	f := set.Lookup(name)
+	if f != nil {
+		parsed, err := strconv.ParseFloat(f.Value.String(), 64)
+		if err != nil {
+			return 0
+		}
+		return parsed
+	}
+	return 0
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_float64_slice.go b/vendor/github.com/urfave/cli/v2/flag_float64_slice.go
new file mode 100644
index 00000000..706ee6cd
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_float64_slice.go
@@ -0,0 +1,163 @@
+package cli
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// Float64Slice wraps []float64 to satisfy flag.Value
+type Float64Slice struct {
+	slice      []float64
+	hasBeenSet bool
+}
+
+// NewFloat64Slice makes a *Float64Slice with default values
+func NewFloat64Slice(defaults ...float64) *Float64Slice {
+	return &Float64Slice{slice: append([]float64{}, defaults...)}
+}
+
+// Set parses the value into a float64 and appends it to the list of values
+func (f *Float64Slice) Set(value string) error {
+	if !f.hasBeenSet {
+		f.slice = []float64{}
+		f.hasBeenSet = true
+	}
+
+	if strings.HasPrefix(value, slPfx) {
+		// Deserializing assumes overwrite
+		_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &f.slice)
+		f.hasBeenSet = true
+		return nil
+	}
+
+	tmp, err := strconv.ParseFloat(value, 64)
+	if err != nil {
+		return err
+	}
+
+	f.slice = append(f.slice, tmp)
+	return nil
+}
+
+// String returns a readable representation of this value (for usage defaults)
+func (f *Float64Slice) String() string {
+	return fmt.Sprintf("%#v", f.slice)
+}
+
+// Serialize allows Float64Slice to fulfill Serializer
+func (f *Float64Slice) Serialize() string {
+	jsonBytes, _ := json.Marshal(f.slice)
+	return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
+}
+
+// Value returns the slice of float64s set by this flag
+func (f *Float64Slice) Value() []float64 {
+	return f.slice
+}
+
+// Get returns the slice of float64s set by this flag
+func (f *Float64Slice) Get() interface{} {
+	return *f
+}
+
+// Float64SliceFlag is a flag with type *Float64Slice
+type Float64SliceFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Value       *Float64Slice
+	DefaultText string
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *Float64SliceFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *Float64SliceFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *Float64SliceFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *Float64SliceFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true if the flag takes a value, otherwise false
+func (f *Float64SliceFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *Float64SliceFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *Float64SliceFlag) GetValue() string {
+	if f.Value != nil {
+		return f.Value.String()
+	}
+	return ""
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *Float64SliceFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		if val != "" {
+			f.Value = &Float64Slice{}
+
+			for _, s := range strings.Split(val, ",") {
+				if err := f.Value.Set(strings.TrimSpace(s)); err != nil {
+					return fmt.Errorf("could not parse %q as float64 slice value for flag %s: %s", f.Value, f.Name, err)
+				}
+			}
+
+			f.HasBeenSet = true
+		}
+	}
+
+	for _, name := range f.Names() {
+		if f.Value == nil {
+			f.Value = &Float64Slice{}
+		}
+		set.Var(f.Value, name, f.Usage)
+	}
+
+	return nil
+}
+
+// Float64Slice looks up the value of a local Float64SliceFlag, returns
+// nil if not found
+func (c *Context) Float64Slice(name string) []float64 {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupFloat64Slice(name, fs)
+	}
+	return nil
+}
+
+func lookupFloat64Slice(name string, set *flag.FlagSet) []float64 {
+	f := set.Lookup(name)
+	if f != nil {
+		if slice, ok := f.Value.(*Float64Slice); ok {
+			return slice.Value()
+		}
+	}
+	return nil
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_generic.go b/vendor/github.com/urfave/cli/v2/flag_generic.go
new file mode 100644
index 00000000..b0c8ff44
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_generic.go
@@ -0,0 +1,108 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+)
+
+// Generic is a generic parseable type identified by a specific flag
+type Generic interface {
+	Set(value string) error
+	String() string
+}
+
+// GenericFlag is a flag with type Generic
+type GenericFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	TakesFile   bool
+	Value       Generic
+	DefaultText string
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *GenericFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *GenericFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *GenericFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *GenericFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *GenericFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *GenericFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *GenericFlag) GetValue() string {
+	if f.Value != nil {
+		return f.Value.String()
+	}
+	return ""
+}
+
+// Apply takes the flagset and calls Set on the generic flag with the value
+// provided by the user for parsing by the flag
+func (f GenericFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		if val != "" {
+			if err := f.Value.Set(val); err != nil {
+				return fmt.Errorf("could not parse %q as value for flag %s: %s", val, f.Name, err)
+			}
+
+			f.HasBeenSet = true
+		}
+	}
+
+	for _, name := range f.Names() {
+		set.Var(f.Value, name, f.Usage)
+	}
+
+	return nil
+}
+
+// Generic looks up the value of a local GenericFlag, returns
+// nil if not found
+func (c *Context) Generic(name string) interface{} {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupGeneric(name, fs)
+	}
+	return nil
+}
+
+func lookupGeneric(name string, set *flag.FlagSet) interface{} {
+	f := set.Lookup(name)
+	if f != nil {
+		parsed, err := f.Value, error(nil)
+		if err != nil {
+			return nil
+		}
+		return parsed
+	}
+	return nil
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_int.go b/vendor/github.com/urfave/cli/v2/flag_int.go
new file mode 100644
index 00000000..ac39d4a9
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_int.go
@@ -0,0 +1,106 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"strconv"
+)
+
+// IntFlag is a flag with type int
+type IntFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Value       int
+	DefaultText string
+	Destination *int
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *IntFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *IntFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *IntFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *IntFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *IntFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *IntFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *IntFlag) GetValue() string {
+	return fmt.Sprintf("%d", f.Value)
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *IntFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		if val != "" {
+			valInt, err := strconv.ParseInt(val, 0, 64)
+
+			if err != nil {
+				return fmt.Errorf("could not parse %q as int value for flag %s: %s", val, f.Name, err)
+			}
+
+			f.Value = int(valInt)
+			f.HasBeenSet = true
+		}
+	}
+
+	for _, name := range f.Names() {
+		if f.Destination != nil {
+			set.IntVar(f.Destination, name, f.Value, f.Usage)
+			continue
+		}
+		set.Int(name, f.Value, f.Usage)
+	}
+
+	return nil
+}
+
+// Int looks up the value of a local IntFlag, returns
+// 0 if not found
+func (c *Context) Int(name string) int {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupInt(name, fs)
+	}
+	return 0
+}
+
+func lookupInt(name string, set *flag.FlagSet) int {
+	f := set.Lookup(name)
+	if f != nil {
+		parsed, err := strconv.ParseInt(f.Value.String(), 0, 64)
+		if err != nil {
+			return 0
+		}
+		return int(parsed)
+	}
+	return 0
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_int64.go b/vendor/github.com/urfave/cli/v2/flag_int64.go
new file mode 100644
index 00000000..e0999126
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_int64.go
@@ -0,0 +1,105 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"strconv"
+)
+
+// Int64Flag is a flag with type int64
+type Int64Flag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Value       int64
+	DefaultText string
+	Destination *int64
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *Int64Flag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *Int64Flag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *Int64Flag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *Int64Flag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *Int64Flag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *Int64Flag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *Int64Flag) GetValue() string {
+	return fmt.Sprintf("%d", f.Value)
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *Int64Flag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		if val != "" {
+			valInt, err := strconv.ParseInt(val, 0, 64)
+
+			if err != nil {
+				return fmt.Errorf("could not parse %q as int value for flag %s: %s", val, f.Name, err)
+			}
+
+			f.Value = valInt
+			f.HasBeenSet = true
+		}
+	}
+
+	for _, name := range f.Names() {
+		if f.Destination != nil {
+			set.Int64Var(f.Destination, name, f.Value, f.Usage)
+			continue
+		}
+		set.Int64(name, f.Value, f.Usage)
+	}
+	return nil
+}
+
+// Int64 looks up the value of a local Int64Flag, returns
+// 0 if not found
+func (c *Context) Int64(name string) int64 {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupInt64(name, fs)
+	}
+	return 0
+}
+
+func lookupInt64(name string, set *flag.FlagSet) int64 {
+	f := set.Lookup(name)
+	if f != nil {
+		parsed, err := strconv.ParseInt(f.Value.String(), 0, 64)
+		if err != nil {
+			return 0
+		}
+		return parsed
+	}
+	return 0
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_int64_slice.go b/vendor/github.com/urfave/cli/v2/flag_int64_slice.go
new file mode 100644
index 00000000..6c7fd937
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_int64_slice.go
@@ -0,0 +1,159 @@
+package cli
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// Int64Slice wraps []int64 to satisfy flag.Value
+type Int64Slice struct {
+	slice      []int64
+	hasBeenSet bool
+}
+
+// NewInt64Slice makes an *Int64Slice with default values
+func NewInt64Slice(defaults ...int64) *Int64Slice {
+	return &Int64Slice{slice: append([]int64{}, defaults...)}
+}
+
+// Set parses the value into an integer and appends it to the list of values
+func (i *Int64Slice) Set(value string) error {
+	if !i.hasBeenSet {
+		i.slice = []int64{}
+		i.hasBeenSet = true
+	}
+
+	if strings.HasPrefix(value, slPfx) {
+		// Deserializing assumes overwrite
+		_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &i.slice)
+		i.hasBeenSet = true
+		return nil
+	}
+
+	tmp, err := strconv.ParseInt(value, 0, 64)
+	if err != nil {
+		return err
+	}
+
+	i.slice = append(i.slice, tmp)
+
+	return nil
+}
+
+// String returns a readable representation of this value (for usage defaults)
+func (i *Int64Slice) String() string {
+	return fmt.Sprintf("%#v", i.slice)
+}
+
+// Serialize allows Int64Slice to fulfill Serializer
+func (i *Int64Slice) Serialize() string {
+	jsonBytes, _ := json.Marshal(i.slice)
+	return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
+}
+
+// Value returns the slice of ints set by this flag
+func (i *Int64Slice) Value() []int64 {
+	return i.slice
+}
+
+// Get returns the slice of ints set by this flag
+func (i *Int64Slice) Get() interface{} {
+	return *i
+}
+
+// Int64SliceFlag is a flag with type *Int64Slice
+type Int64SliceFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Value       *Int64Slice
+	DefaultText string
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *Int64SliceFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *Int64SliceFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *Int64SliceFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *Int64SliceFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *Int64SliceFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f Int64SliceFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *Int64SliceFlag) GetValue() string {
+	if f.Value != nil {
+		return f.Value.String()
+	}
+	return ""
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *Int64SliceFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		f.Value = &Int64Slice{}
+
+		for _, s := range strings.Split(val, ",") {
+			if err := f.Value.Set(strings.TrimSpace(s)); err != nil {
+				return fmt.Errorf("could not parse %q as int64 slice value for flag %s: %s", val, f.Name, err)
+			}
+		}
+
+		f.HasBeenSet = true
+	}
+
+	for _, name := range f.Names() {
+		if f.Value == nil {
+			f.Value = &Int64Slice{}
+		}
+		set.Var(f.Value, name, f.Usage)
+	}
+
+	return nil
+}
+
+// Int64Slice looks up the value of a local Int64SliceFlag, returns
+// nil if not found
+func (c *Context) Int64Slice(name string) []int64 {
+	return lookupInt64Slice(name, c.flagSet)
+}
+
+func lookupInt64Slice(name string, set *flag.FlagSet) []int64 {
+	f := set.Lookup(name)
+	if f != nil {
+		if slice, ok := f.Value.(*Int64Slice); ok {
+			return slice.Value()
+		}
+	}
+	return nil
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_int_slice.go b/vendor/github.com/urfave/cli/v2/flag_int_slice.go
new file mode 100644
index 00000000..4e0afc02
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_int_slice.go
@@ -0,0 +1,173 @@
+package cli
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// IntSlice wraps []int to satisfy flag.Value
+type IntSlice struct {
+	slice      []int
+	hasBeenSet bool
+}
+
+// NewIntSlice makes an *IntSlice with default values
+func NewIntSlice(defaults ...int) *IntSlice {
+	return &IntSlice{slice: append([]int{}, defaults...)}
+}
+
+// TODO: Consistently have specific Set function for Int64 and Float64 ?
+// SetInt directly adds an integer to the list of values
+func (i *IntSlice) SetInt(value int) {
+	if !i.hasBeenSet {
+		i.slice = []int{}
+		i.hasBeenSet = true
+	}
+
+	i.slice = append(i.slice, value)
+}
+
+// Set parses the value into an integer and appends it to the list of values
+func (i *IntSlice) Set(value string) error {
+	if !i.hasBeenSet {
+		i.slice = []int{}
+		i.hasBeenSet = true
+	}
+
+	if strings.HasPrefix(value, slPfx) {
+		// Deserializing assumes overwrite
+		_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &i.slice)
+		i.hasBeenSet = true
+		return nil
+	}
+
+	tmp, err := strconv.ParseInt(value, 0, 64)
+	if err != nil {
+		return err
+	}
+
+	i.slice = append(i.slice, int(tmp))
+
+	return nil
+}
+
+// String returns a readable representation of this value (for usage defaults)
+func (i *IntSlice) String() string {
+	return fmt.Sprintf("%#v", i.slice)
+}
+
+// Serialize allows IntSlice to fulfill Serializer
+func (i *IntSlice) Serialize() string {
+	jsonBytes, _ := json.Marshal(i.slice)
+	return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
+}
+
+// Value returns the slice of ints set by this flag
+func (i *IntSlice) Value() []int {
+	return i.slice
+}
+
+// Get returns the slice of ints set by this flag
+func (i *IntSlice) Get() interface{} {
+	return *i
+}
+
+// IntSliceFlag is a flag with type *IntSlice
+type IntSliceFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Value       *IntSlice
+	DefaultText string
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *IntSliceFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *IntSliceFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *IntSliceFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *IntSliceFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *IntSliceFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f IntSliceFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *IntSliceFlag) GetValue() string {
+	if f.Value != nil {
+		return f.Value.String()
+	}
+	return ""
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *IntSliceFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		f.Value = &IntSlice{}
+
+		for _, s := range strings.Split(val, ",") {
+			if err := f.Value.Set(strings.TrimSpace(s)); err != nil {
+				return fmt.Errorf("could not parse %q as int slice value for flag %s: %s", val, f.Name, err)
+			}
+		}
+
+		f.HasBeenSet = true
+	}
+
+	for _, name := range f.Names() {
+		if f.Value == nil {
+			f.Value = &IntSlice{}
+		}
+		set.Var(f.Value, name, f.Usage)
+	}
+
+	return nil
+}
+
+// IntSlice looks up the value of a local IntSliceFlag, returns
+// nil if not found
+func (c *Context) IntSlice(name string) []int {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupIntSlice(name, c.flagSet)
+	}
+	return nil
+}
+
+func lookupIntSlice(name string, set *flag.FlagSet) []int {
+	f := set.Lookup(name)
+	if f != nil {
+		if slice, ok := f.Value.(*IntSlice); ok {
+			return slice.Value()
+		}
+	}
+	return nil
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_path.go b/vendor/github.com/urfave/cli/v2/flag_path.go
new file mode 100644
index 00000000..8070dc4b
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_path.go
@@ -0,0 +1,95 @@
+package cli
+
+import "flag"
+
+type PathFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	TakesFile   bool
+	Value       string
+	DefaultText string
+	Destination *string
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *PathFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *PathFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *PathFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *PathFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *PathFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *PathFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *PathFlag) GetValue() string {
+	return f.Value
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *PathFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		f.Value = val
+		f.HasBeenSet = true
+	}
+
+	for _, name := range f.Names() {
+		if f.Destination != nil {
+			set.StringVar(f.Destination, name, f.Value, f.Usage)
+			continue
+		}
+		set.String(name, f.Value, f.Usage)
+	}
+
+	return nil
+}
+
+// Path looks up the value of a local PathFlag, returns
+// "" if not found
+func (c *Context) Path(name string) string {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupPath(name, fs)
+	}
+
+	return ""
+}
+
+func lookupPath(name string, set *flag.FlagSet) string {
+	f := set.Lookup(name)
+	if f != nil {
+		parsed, err := f.Value.String(), error(nil)
+		if err != nil {
+			return ""
+		}
+		return parsed
+	}
+	return ""
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_string.go b/vendor/github.com/urfave/cli/v2/flag_string.go
new file mode 100644
index 00000000..400bb532
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_string.go
@@ -0,0 +1,95 @@
+package cli
+
+import "flag"
+
+// StringFlag is a flag with type string
+type StringFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	TakesFile   bool
+	Value       string
+	DefaultText string
+	Destination *string
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *StringFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *StringFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *StringFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *StringFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *StringFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *StringFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *StringFlag) GetValue() string {
+	return f.Value
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *StringFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		f.Value = val
+		f.HasBeenSet = true
+	}
+
+	for _, name := range f.Names() {
+		if f.Destination != nil {
+			set.StringVar(f.Destination, name, f.Value, f.Usage)
+			continue
+		}
+		set.String(name, f.Value, f.Usage)
+	}
+
+	return nil
+}
+
+// String looks up the value of a local StringFlag, returns
+// "" if not found
+func (c *Context) String(name string) string {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupString(name, fs)
+	}
+	return ""
+}
+
+func lookupString(name string, set *flag.FlagSet) string {
+	f := set.Lookup(name)
+	if f != nil {
+		parsed, err := f.Value.String(), error(nil)
+		if err != nil {
+			return ""
+		}
+		return parsed
+	}
+	return ""
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_string_slice.go b/vendor/github.com/urfave/cli/v2/flag_string_slice.go
new file mode 100644
index 00000000..ac363bf6
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_string_slice.go
@@ -0,0 +1,171 @@
+package cli
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"strings"
+)
+
+// StringSlice wraps a []string to satisfy flag.Value
+type StringSlice struct {
+	slice      []string
+	hasBeenSet bool
+}
+
+// NewStringSlice creates a *StringSlice with default values
+func NewStringSlice(defaults ...string) *StringSlice {
+	return &StringSlice{slice: append([]string{}, defaults...)}
+}
+
+// Set appends the string value to the list of values
+func (s *StringSlice) Set(value string) error {
+	if !s.hasBeenSet {
+		s.slice = []string{}
+		s.hasBeenSet = true
+	}
+
+	if strings.HasPrefix(value, slPfx) {
+		// Deserializing assumes overwrite
+		_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &s.slice)
+		s.hasBeenSet = true
+		return nil
+	}
+
+	s.slice = append(s.slice, value)
+
+	return nil
+}
+
+// String returns a readable representation of this value (for usage defaults)
+func (s *StringSlice) String() string {
+	return fmt.Sprintf("%s", s.slice)
+}
+
+// Serialize allows StringSlice to fulfill Serializer
+func (s *StringSlice) Serialize() string {
+	jsonBytes, _ := json.Marshal(s.slice)
+	return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
+}
+
+// Value returns the slice of strings set by this flag
+func (s *StringSlice) Value() []string {
+	return s.slice
+}
+
+// Get returns the slice of strings set by this flag
+func (s *StringSlice) Get() interface{} {
+	return *s
+}
+
+// StringSliceFlag is a flag with type *StringSlice
+type StringSliceFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	TakesFile   bool
+	Value       *StringSlice
+	DefaultText string
+	HasBeenSet  bool
+	Destination *StringSlice
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *StringSliceFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *StringSliceFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *StringSliceFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *StringSliceFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *StringSliceFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *StringSliceFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *StringSliceFlag) GetValue() string {
+	if f.Value != nil {
+		return f.Value.String()
+	}
+	return ""
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *StringSliceFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		f.Value = &StringSlice{}
+		destination := f.Value
+		if f.Destination != nil {
+			destination = f.Destination
+		}
+
+		for _, s := range strings.Split(val, ",") {
+			if err := destination.Set(strings.TrimSpace(s)); err != nil {
+				return fmt.Errorf("could not parse %q as string value for flag %s: %s", val, f.Name, err)
+			}
+		}
+
+		// Set this to false so that we reset the slice if we then set values from
+		// flags that have already been set by the environment.
+		destination.hasBeenSet = false
+		f.HasBeenSet = true
+	}
+
+	for _, name := range f.Names() {
+		if f.Value == nil {
+			f.Value = &StringSlice{}
+		}
+
+		if f.Destination != nil {
+			set.Var(f.Destination, name, f.Usage)
+			continue
+		}
+
+		set.Var(f.Value, name, f.Usage)
+	}
+
+	return nil
+}
+
+// StringSlice looks up the value of a local StringSliceFlag, returns
+// nil if not found
+func (c *Context) StringSlice(name string) []string {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupStringSlice(name, fs)
+	}
+	return nil
+}
+
+func lookupStringSlice(name string, set *flag.FlagSet) []string {
+	f := set.Lookup(name)
+	if f != nil {
+		if slice, ok := f.Value.(*StringSlice); ok {
+			return slice.Value()
+		}
+	}
+	return nil
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_timestamp.go b/vendor/github.com/urfave/cli/v2/flag_timestamp.go
new file mode 100644
index 00000000..9fac1d1e
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_timestamp.go
@@ -0,0 +1,152 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"time"
+)
+
+// Timestamp wrap to satisfy golang's flag interface.
+type Timestamp struct {
+	timestamp  *time.Time
+	hasBeenSet bool
+	layout     string
+}
+
+// Timestamp constructor
+func NewTimestamp(timestamp time.Time) *Timestamp {
+	return &Timestamp{timestamp: &timestamp}
+}
+
+// Set the timestamp value directly
+func (t *Timestamp) SetTimestamp(value time.Time) {
+	if !t.hasBeenSet {
+		t.timestamp = &value
+		t.hasBeenSet = true
+	}
+}
+
+// Set the timestamp string layout for future parsing
+func (t *Timestamp) SetLayout(layout string) {
+	t.layout = layout
+}
+
+// Parses the string value to timestamp
+func (t *Timestamp) Set(value string) error {
+	timestamp, err := time.Parse(t.layout, value)
+	if err != nil {
+		return err
+	}
+
+	t.timestamp = &timestamp
+	t.hasBeenSet = true
+	return nil
+}
+
+// String returns a readable representation of this value (for usage defaults)
+func (t *Timestamp) String() string {
+	return fmt.Sprintf("%#v", t.timestamp)
+}
+
+// Value returns the timestamp value stored in the flag
+func (t *Timestamp) Value() *time.Time {
+	return t.timestamp
+}
+
+// Get returns the flag structure
+func (t *Timestamp) Get() interface{} {
+	return *t
+}
+
+// TimestampFlag is a flag with type time
+type TimestampFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Layout      string
+	Value       *Timestamp
+	DefaultText string
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *TimestampFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *TimestampFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *TimestampFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *TimestampFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *TimestampFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *TimestampFlag) GetUsage() string {
+	return f.Usage
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *TimestampFlag) GetValue() string {
+	if f.Value != nil {
+		return f.Value.timestamp.String()
+	}
+	return ""
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *TimestampFlag) Apply(set *flag.FlagSet) error {
+	if f.Layout == "" {
+		return fmt.Errorf("timestamp Layout is required")
+	}
+	f.Value = &Timestamp{}
+	f.Value.SetLayout(f.Layout)
+
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		if err := f.Value.Set(val); err != nil {
+			return fmt.Errorf("could not parse %q as timestamp value for flag %s: %s", val, f.Name, err)
+		}
+		f.HasBeenSet = true
+	}
+
+	for _, name := range f.Names() {
+		set.Var(f.Value, name, f.Usage)
+	}
+	return nil
+}
+
+// Timestamp gets the timestamp from a flag name
+func (c *Context) Timestamp(name string) *time.Time {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupTimestamp(name, fs)
+	}
+	return nil
+}
+
+// Fetches the timestamp value from the local timestampWrap
+func lookupTimestamp(name string, set *flag.FlagSet) *time.Time {
+	f := set.Lookup(name)
+	if f != nil {
+		return (f.Value.(*Timestamp)).Value()
+	}
+	return nil
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_uint.go b/vendor/github.com/urfave/cli/v2/flag_uint.go
new file mode 100644
index 00000000..2e5e76b0
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_uint.go
@@ -0,0 +1,105 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"strconv"
+)
+
+// UintFlag is a flag with type uint
+type UintFlag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Value       uint
+	DefaultText string
+	Destination *uint
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *UintFlag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *UintFlag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *UintFlag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *UintFlag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *UintFlag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *UintFlag) GetUsage() string {
+	return f.Usage
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *UintFlag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		if val != "" {
+			valInt, err := strconv.ParseUint(val, 0, 64)
+			if err != nil {
+				return fmt.Errorf("could not parse %q as uint value for flag %s: %s", val, f.Name, err)
+			}
+
+			f.Value = uint(valInt)
+			f.HasBeenSet = true
+		}
+	}
+
+	for _, name := range f.Names() {
+		if f.Destination != nil {
+			set.UintVar(f.Destination, name, f.Value, f.Usage)
+			continue
+		}
+		set.Uint(name, f.Value, f.Usage)
+	}
+
+	return nil
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *UintFlag) GetValue() string {
+	return fmt.Sprintf("%d", f.Value)
+}
+
+// Uint looks up the value of a local UintFlag, returns
+// 0 if not found
+func (c *Context) Uint(name string) uint {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupUint(name, fs)
+	}
+	return 0
+}
+
+func lookupUint(name string, set *flag.FlagSet) uint {
+	f := set.Lookup(name)
+	if f != nil {
+		parsed, err := strconv.ParseUint(f.Value.String(), 0, 64)
+		if err != nil {
+			return 0
+		}
+		return uint(parsed)
+	}
+	return 0
+}
diff --git a/vendor/github.com/urfave/cli/v2/flag_uint64.go b/vendor/github.com/urfave/cli/v2/flag_uint64.go
new file mode 100644
index 00000000..8fc3289d
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/flag_uint64.go
@@ -0,0 +1,105 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"strconv"
+)
+
+// Uint64Flag is a flag with type uint64
+type Uint64Flag struct {
+	Name        string
+	Aliases     []string
+	Usage       string
+	EnvVars     []string
+	FilePath    string
+	Required    bool
+	Hidden      bool
+	Value       uint64
+	DefaultText string
+	Destination *uint64
+	HasBeenSet  bool
+}
+
+// IsSet returns whether or not the flag has been set through env or file
+func (f *Uint64Flag) IsSet() bool {
+	return f.HasBeenSet
+}
+
+// String returns a readable representation of this value
+// (for usage defaults)
+func (f *Uint64Flag) String() string {
+	return FlagStringer(f)
+}
+
+// Names returns the names of the flag
+func (f *Uint64Flag) Names() []string {
+	return flagNames(f.Name, f.Aliases)
+}
+
+// IsRequired returns whether or not the flag is required
+func (f *Uint64Flag) IsRequired() bool {
+	return f.Required
+}
+
+// TakesValue returns true of the flag takes a value, otherwise false
+func (f *Uint64Flag) TakesValue() bool {
+	return true
+}
+
+// GetUsage returns the usage string for the flag
+func (f *Uint64Flag) GetUsage() string {
+	return f.Usage
+}
+
+// Apply populates the flag given the flag set and environment
+func (f *Uint64Flag) Apply(set *flag.FlagSet) error {
+	if val, ok := flagFromEnvOrFile(f.EnvVars, f.FilePath); ok {
+		if val != "" {
+			valInt, err := strconv.ParseUint(val, 0, 64)
+			if err != nil {
+				return fmt.Errorf("could not parse %q as uint64 value for flag %s: %s", val, f.Name, err)
+			}
+
+			f.Value = valInt
+			f.HasBeenSet = true
+		}
+	}
+
+	for _, name := range f.Names() {
+		if f.Destination != nil {
+			set.Uint64Var(f.Destination, name, f.Value, f.Usage)
+			continue
+		}
+		set.Uint64(name, f.Value, f.Usage)
+	}
+
+	return nil
+}
+
+// GetValue returns the flags value as string representation and an empty
+// string if the flag takes no value at all.
+func (f *Uint64Flag) GetValue() string {
+	return fmt.Sprintf("%d", f.Value)
+}
+
+// Uint64 looks up the value of a local Uint64Flag, returns
+// 0 if not found
+func (c *Context) Uint64(name string) uint64 {
+	if fs := lookupFlagSet(name, c); fs != nil {
+		return lookupUint64(name, fs)
+	}
+	return 0
+}
+
+func lookupUint64(name string, set *flag.FlagSet) uint64 {
+	f := set.Lookup(name)
+	if f != nil {
+		parsed, err := strconv.ParseUint(f.Value.String(), 0, 64)
+		if err != nil {
+			return 0
+		}
+		return parsed
+	}
+	return 0
+}
diff --git a/vendor/gopkg.in/urfave/cli.v2/funcs.go b/vendor/github.com/urfave/cli/v2/funcs.go
similarity index 57%
rename from vendor/gopkg.in/urfave/cli.v2/funcs.go
rename to vendor/github.com/urfave/cli/v2/funcs.go
index fa7d502f..474c48fa 100644
--- a/vendor/gopkg.in/urfave/cli.v2/funcs.go
+++ b/vendor/github.com/urfave/cli/v2/funcs.go
@@ -1,7 +1,7 @@
 package cli
 
-// ShellCompleteFunc is an action to execute when the shell completion flag is set
-type ShellCompleteFunc func(*Context)
+// BashCompleteFunc is an action to execute when the shell completion flag is set
+type BashCompleteFunc func(*Context)
 
 // BeforeFunc is an action to execute before any subcommands are run, but after
 // the context is ready if a non-nil error is returned, no subcommands are run
@@ -23,6 +23,22 @@ type CommandNotFoundFunc func(*Context, string)
 // is displayed and the execution is interrupted.
 type OnUsageErrorFunc func(context *Context, err error, isSubcommand bool) error
 
+// ExitErrHandlerFunc is executed if provided in order to handle exitError values
+// returned by Actions and Before/After functions.
+type ExitErrHandlerFunc func(context *Context, err error)
+
 // FlagStringFunc is used by the help generation to display a flag, which is
 // expected to be a single line.
 type FlagStringFunc func(Flag) string
+
+// FlagNamePrefixFunc is used by the default FlagStringFunc to create prefix
+// text for a flag's full name.
+type FlagNamePrefixFunc func(fullName []string, placeholder string) string
+
+// FlagEnvHintFunc is used by the default FlagStringFunc to annotate flag help
+// with the environment variable details.
+type FlagEnvHintFunc func(envVars []string, str string) string
+
+// FlagFileHintFunc is used by the default FlagStringFunc to annotate flag help
+// with the file path details.
+type FlagFileHintFunc func(filePath, str string) string
diff --git a/vendor/github.com/urfave/cli/v2/go.mod b/vendor/github.com/urfave/cli/v2/go.mod
new file mode 100644
index 00000000..c38d41c1
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/go.mod
@@ -0,0 +1,9 @@
+module github.com/urfave/cli/v2
+
+go 1.11
+
+require (
+	github.com/BurntSushi/toml v0.3.1
+	github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d
+	gopkg.in/yaml.v2 v2.2.2
+)
diff --git a/vendor/github.com/urfave/cli/v2/go.sum b/vendor/github.com/urfave/cli/v2/go.sum
new file mode 100644
index 00000000..ef121ff5
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/go.sum
@@ -0,0 +1,14 @@
+github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
+github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
+github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/vendor/github.com/urfave/cli/v2/help.go b/vendor/github.com/urfave/cli/v2/help.go
new file mode 100644
index 00000000..c1e974a4
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/help.go
@@ -0,0 +1,368 @@
+package cli
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"text/tabwriter"
+	"text/template"
+	"unicode/utf8"
+)
+
+var helpCommand = &Command{
+	Name:      "help",
+	Aliases:   []string{"h"},
+	Usage:     "Shows a list of commands or help for one command",
+	ArgsUsage: "[command]",
+	Action: func(c *Context) error {
+		args := c.Args()
+		if args.Present() {
+			return ShowCommandHelp(c, args.First())
+		}
+
+		_ = ShowAppHelp(c)
+		return nil
+	},
+}
+
+var helpSubcommand = &Command{
+	Name:      "help",
+	Aliases:   []string{"h"},
+	Usage:     "Shows a list of commands or help for one command",
+	ArgsUsage: "[command]",
+	Action: func(c *Context) error {
+		args := c.Args()
+		if args.Present() {
+			return ShowCommandHelp(c, args.First())
+		}
+
+		return ShowSubcommandHelp(c)
+	},
+}
+
+// Prints help for the App or Command
+type helpPrinter func(w io.Writer, templ string, data interface{})
+
+// Prints help for the App or Command with custom template function.
+type helpPrinterCustom func(w io.Writer, templ string, data interface{}, customFunc map[string]interface{})
+
+// HelpPrinter is a function that writes the help output. If not set explicitly,
+// this calls HelpPrinterCustom using only the default template functions.
+//
+// If custom logic for printing help is required, this function can be
+// overridden. If the ExtraInfo field is defined on an App, this function
+// should not be modified, as HelpPrinterCustom will be used directly in order
+// to capture the extra information.
+var HelpPrinter helpPrinter = printHelp
+
+// HelpPrinterCustom is a function that writes the help output. It is used as
+// the default implementation of HelpPrinter, and may be called directly if
+// the ExtraInfo field is set on an App.
+var HelpPrinterCustom helpPrinterCustom = printHelpCustom
+
+// VersionPrinter prints the version for the App
+var VersionPrinter = printVersion
+
+// ShowAppHelpAndExit - Prints the list of subcommands for the app and exits with exit code.
+func ShowAppHelpAndExit(c *Context, exitCode int) {
+	_ = ShowAppHelp(c)
+	os.Exit(exitCode)
+}
+
+// ShowAppHelp is an action that displays the help.
+func ShowAppHelp(c *Context) error {
+	template := c.App.CustomAppHelpTemplate
+	if template == "" {
+		template = AppHelpTemplate
+	}
+
+	if c.App.ExtraInfo == nil {
+		HelpPrinter(c.App.Writer, template, c.App)
+		return nil
+	}
+
+	customAppData := func() map[string]interface{} {
+		return map[string]interface{}{
+			"ExtraInfo": c.App.ExtraInfo,
+		}
+	}
+	HelpPrinterCustom(c.App.Writer, template, c.App, customAppData())
+
+	return nil
+}
+
+// DefaultAppComplete prints the list of subcommands as the default app completion method
+func DefaultAppComplete(c *Context) {
+	DefaultCompleteWithFlags(nil)(c)
+}
+
+func printCommandSuggestions(commands []*Command, writer io.Writer) {
+	for _, command := range commands {
+		if command.Hidden {
+			continue
+		}
+		if os.Getenv("_CLI_ZSH_AUTOCOMPLETE_HACK") == "1" {
+			for _, name := range command.Names() {
+				_, _ = fmt.Fprintf(writer, "%s:%s\n", name, command.Usage)
+			}
+		} else {
+			for _, name := range command.Names() {
+				_, _ = fmt.Fprintf(writer, "%s\n", name)
+			}
+		}
+	}
+}
+
+func cliArgContains(flagName string) bool {
+	for _, name := range strings.Split(flagName, ",") {
+		name = strings.TrimSpace(name)
+		count := utf8.RuneCountInString(name)
+		if count > 2 {
+			count = 2
+		}
+		flag := fmt.Sprintf("%s%s", strings.Repeat("-", count), name)
+		for _, a := range os.Args {
+			if a == flag {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func printFlagSuggestions(lastArg string, flags []Flag, writer io.Writer) {
+	cur := strings.TrimPrefix(lastArg, "-")
+	cur = strings.TrimPrefix(cur, "-")
+	for _, flag := range flags {
+		if bflag, ok := flag.(*BoolFlag); ok && bflag.Hidden {
+			continue
+		}
+		for _, name := range flag.Names() {
+			name = strings.TrimSpace(name)
+			// this will get total count utf8 letters in flag name
+			count := utf8.RuneCountInString(name)
+			if count > 2 {
+				count = 2 // resuse this count to generate single - or -- in flag completion
+			}
+			// if flag name has more than one utf8 letter and last argument in cli has -- prefix then
+			// skip flag completion for short flags example -v or -x
+			if strings.HasPrefix(lastArg, "--") && count == 1 {
+				continue
+			}
+			// match if last argument matches this flag and it is not repeated
+			if strings.HasPrefix(name, cur) && cur != name && !cliArgContains(name) {
+				flagCompletion := fmt.Sprintf("%s%s", strings.Repeat("-", count), name)
+				_, _ = fmt.Fprintln(writer, flagCompletion)
+			}
+		}
+	}
+}
+
+func DefaultCompleteWithFlags(cmd *Command) func(c *Context) {
+	return func(c *Context) {
+		if len(os.Args) > 2 {
+			lastArg := os.Args[len(os.Args)-2]
+			if strings.HasPrefix(lastArg, "-") {
+				printFlagSuggestions(lastArg, c.App.Flags, c.App.Writer)
+				if cmd != nil {
+					printFlagSuggestions(lastArg, cmd.Flags, c.App.Writer)
+				}
+				return
+			}
+		}
+		if cmd != nil {
+			printCommandSuggestions(cmd.Subcommands, c.App.Writer)
+		} else {
+			printCommandSuggestions(c.App.Commands, c.App.Writer)
+		}
+	}
+}
+
+// ShowCommandHelpAndExit - exits with code after showing help
+func ShowCommandHelpAndExit(c *Context, command string, code int) {
+	_ = ShowCommandHelp(c, command)
+	os.Exit(code)
+}
+
+// ShowCommandHelp prints help for the given command
+func ShowCommandHelp(ctx *Context, command string) error {
+	// show the subcommand help for a command with subcommands
+	if command == "" {
+		HelpPrinter(ctx.App.Writer, SubcommandHelpTemplate, ctx.App)
+		return nil
+	}
+
+	for _, c := range ctx.App.Commands {
+		if c.HasName(command) {
+			templ := c.CustomHelpTemplate
+			if templ == "" {
+				templ = CommandHelpTemplate
+			}
+
+			HelpPrinter(ctx.App.Writer, templ, c)
+
+			return nil
+		}
+	}
+
+	if ctx.App.CommandNotFound == nil {
+		return Exit(fmt.Sprintf("No help topic for '%v'", command), 3)
+	}
+
+	ctx.App.CommandNotFound(ctx, command)
+	return nil
+}
+
+// ShowSubcommandHelp prints help for the given subcommand
+func ShowSubcommandHelp(c *Context) error {
+	if c == nil {
+		return nil
+	}
+
+	if c.Command != nil {
+		return ShowCommandHelp(c, c.Command.Name)
+	}
+
+	return ShowCommandHelp(c, "")
+}
+
+// ShowVersion prints the version number of the App
+func ShowVersion(c *Context) {
+	VersionPrinter(c)
+}
+
+func printVersion(c *Context) {
+	_, _ = fmt.Fprintf(c.App.Writer, "%v version %v\n", c.App.Name, c.App.Version)
+}
+
+// ShowCompletions prints the lists of commands within a given context
+func ShowCompletions(c *Context) {
+	a := c.App
+	if a != nil && a.BashComplete != nil {
+		a.BashComplete(c)
+	}
+}
+
+// ShowCommandCompletions prints the custom completions for a given command
+func ShowCommandCompletions(ctx *Context, command string) {
+	c := ctx.App.Command(command)
+	if c != nil {
+		if c.BashComplete != nil {
+			c.BashComplete(ctx)
+		} else {
+			DefaultCompleteWithFlags(c)(ctx)
+		}
+	}
+
+}
+
+// printHelpCustom is the default implementation of HelpPrinterCustom.
+//
+// The customFuncs map will be combined with a default template.FuncMap to
+// allow using arbitrary functions in template rendering.
+func printHelpCustom(out io.Writer, templ string, data interface{}, customFuncs map[string]interface{}) {
+	funcMap := template.FuncMap{
+		"join": strings.Join,
+	}
+	for key, value := range customFuncs {
+		funcMap[key] = value
+	}
+
+	w := tabwriter.NewWriter(out, 1, 8, 2, ' ', 0)
+	t := template.Must(template.New("help").Funcs(funcMap).Parse(templ))
+
+	err := t.Execute(w, data)
+	if err != nil {
+		// If the writer is closed, t.Execute will fail, and there's nothing
+		// we can do to recover.
+		if os.Getenv("CLI_TEMPLATE_ERROR_DEBUG") != "" {
+			_, _ = fmt.Fprintf(ErrWriter, "CLI TEMPLATE ERROR: %#v\n", err)
+		}
+		return
+	}
+	_ = w.Flush()
+}
+
+func printHelp(out io.Writer, templ string, data interface{}) {
+	HelpPrinterCustom(out, templ, data, nil)
+}
+
+func checkVersion(c *Context) bool {
+	found := false
+	for _, name := range VersionFlag.Names() {
+		if c.Bool(name) {
+			found = true
+		}
+	}
+	return found
+}
+
+func checkHelp(c *Context) bool {
+	found := false
+	for _, name := range HelpFlag.Names() {
+		if c.Bool(name) {
+			found = true
+		}
+	}
+	return found
+}
+
+func checkCommandHelp(c *Context, name string) bool {
+	if c.Bool("h") || c.Bool("help") {
+		_ = ShowCommandHelp(c, name)
+		return true
+	}
+
+	return false
+}
+
+func checkSubcommandHelp(c *Context) bool {
+	if c.Bool("h") || c.Bool("help") {
+		_ = ShowSubcommandHelp(c)
+		return true
+	}
+
+	return false
+}
+
+func checkShellCompleteFlag(a *App, arguments []string) (bool, []string) {
+	if !a.EnableBashCompletion {
+		return false, arguments
+	}
+
+	pos := len(arguments) - 1
+	lastArg := arguments[pos]
+
+	if lastArg != "--generate-bash-completion" {
+		return false, arguments
+	}
+
+	return true, arguments[:pos]
+}
+
+func checkCompletions(c *Context) bool {
+	if !c.shellComplete {
+		return false
+	}
+
+	if args := c.Args(); args.Present() {
+		name := args.First()
+		if cmd := c.App.Command(name); cmd != nil {
+			// let the command handle the completion
+			return false
+		}
+	}
+
+	ShowCompletions(c)
+	return true
+}
+
+func checkCommandCompletions(c *Context, name string) bool {
+	if !c.shellComplete {
+		return false
+	}
+
+	ShowCommandCompletions(c, name)
+	return true
+}
diff --git a/vendor/github.com/urfave/cli/v2/parse.go b/vendor/github.com/urfave/cli/v2/parse.go
new file mode 100644
index 00000000..7df17296
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/parse.go
@@ -0,0 +1,94 @@
+package cli
+
+import (
+	"flag"
+	"strings"
+)
+
+type iterativeParser interface {
+	newFlagSet() (*flag.FlagSet, error)
+	useShortOptionHandling() bool
+}
+
+// To enable short-option handling (e.g., "-it" vs "-i -t") we have to
+// iteratively catch parsing errors. This way we achieve LR parsing without
+// transforming any arguments. Otherwise, there is no way we can discriminate
+// combined short options from common arguments that should be left untouched.
+// Pass `shellComplete` to continue parsing options on failure during shell
+// completion when, the user-supplied options may be incomplete.
+func parseIter(set *flag.FlagSet, ip iterativeParser, args []string, shellComplete bool) error {
+	for {
+		err := set.Parse(args)
+		if !ip.useShortOptionHandling() || err == nil {
+			if shellComplete {
+				return nil
+			}
+			return err
+		}
+
+		errStr := err.Error()
+		trimmed := strings.TrimPrefix(errStr, "flag provided but not defined: -")
+		if errStr == trimmed {
+			return err
+		}
+
+		// regenerate the initial args with the split short opts
+		argsWereSplit := false
+		for i, arg := range args {
+			// skip args that are not part of the error message
+			if name := strings.TrimLeft(arg, "-"); name != trimmed {
+				continue
+			}
+
+			// if we can't split, the error was accurate
+			shortOpts := splitShortOptions(set, arg)
+			if len(shortOpts) == 1 {
+				return err
+			}
+
+			// swap current argument with the split version
+			args = append(args[:i], append(shortOpts, args[i+1:]...)...)
+			argsWereSplit = true
+			break
+		}
+
+		// This should be an impossible to reach code path, but in case the arg
+		// splitting failed to happen, this will prevent infinite loops
+		if !argsWereSplit {
+			return err
+		}
+
+		// Since custom parsing failed, replace the flag set before retrying
+		newSet, err := ip.newFlagSet()
+		if err != nil {
+			return err
+		}
+		*set = *newSet
+	}
+}
+
+func splitShortOptions(set *flag.FlagSet, arg string) []string {
+	shortFlagsExist := func(s string) bool {
+		for _, c := range s[1:] {
+			if f := set.Lookup(string(c)); f == nil {
+				return false
+			}
+		}
+		return true
+	}
+
+	if !isSplittable(arg) || !shortFlagsExist(arg) {
+		return []string{arg}
+	}
+
+	separated := make([]string, 0, len(arg)-1)
+	for _, flagChar := range arg[1:] {
+		separated = append(separated, "-"+string(flagChar))
+	}
+
+	return separated
+}
+
+func isSplittable(flagArg string) bool {
+	return strings.HasPrefix(flagArg, "-") && !strings.HasPrefix(flagArg, "--") && len(flagArg) > 2
+}
diff --git a/vendor/github.com/urfave/cli/v2/sort.go b/vendor/github.com/urfave/cli/v2/sort.go
new file mode 100644
index 00000000..23d1c2f7
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/sort.go
@@ -0,0 +1,29 @@
+package cli
+
+import "unicode"
+
+// lexicographicLess compares strings alphabetically considering case.
+func lexicographicLess(i, j string) bool {
+	iRunes := []rune(i)
+	jRunes := []rune(j)
+
+	lenShared := len(iRunes)
+	if lenShared > len(jRunes) {
+		lenShared = len(jRunes)
+	}
+
+	for index := 0; index < lenShared; index++ {
+		ir := iRunes[index]
+		jr := jRunes[index]
+
+		if lir, ljr := unicode.ToLower(ir), unicode.ToLower(jr); lir != ljr {
+			return lir < ljr
+		}
+
+		if ir != jr {
+			return ir < jr
+		}
+	}
+
+	return i < j
+}
diff --git a/vendor/github.com/urfave/cli/v2/template.go b/vendor/github.com/urfave/cli/v2/template.go
new file mode 100644
index 00000000..aee3e049
--- /dev/null
+++ b/vendor/github.com/urfave/cli/v2/template.go
@@ -0,0 +1,120 @@
+package cli
+
+// AppHelpTemplate is the text template for the Default help topic.
+// cli.go uses text/template to render templates. You can
+// render custom help text by setting this variable.
+var AppHelpTemplate = `NAME:
+   {{.Name}}{{if .Usage}} - {{.Usage}}{{end}}
+
+USAGE:
+   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Version}}{{if not .HideVersion}}
+
+VERSION:
+   {{.Version}}{{end}}{{end}}{{if .Description}}
+
+DESCRIPTION:
+   {{.Description}}{{end}}{{if len .Authors}}
+
+AUTHOR{{with $length := len .Authors}}{{if ne 1 $length}}S{{end}}{{end}}:
+   {{range $index, $author := .Authors}}{{if $index}}
+   {{end}}{{$author}}{{end}}{{end}}{{if .VisibleCommands}}
+
+COMMANDS:{{range .VisibleCategories}}{{if .Name}}
+   {{.Name}}:{{range .VisibleCommands}}
+     {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}{{else}}{{range .VisibleCommands}}
+   {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
+
+GLOBAL OPTIONS:
+   {{range $index, $option := .VisibleFlags}}{{if $index}}
+   {{end}}{{$option}}{{end}}{{end}}{{if .Copyright}}
+
+COPYRIGHT:
+   {{.Copyright}}{{end}}
+`
+
+// CommandHelpTemplate is the text template for the command help topic.
+// cli.go uses text/template to render templates. You can
+// render custom help text by setting this variable.
+var CommandHelpTemplate = `NAME:
+   {{.HelpName}} - {{.Usage}}
+
+USAGE:
+   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}}{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Category}}
+
+CATEGORY:
+   {{.Category}}{{end}}{{if .Description}}
+
+DESCRIPTION:
+   {{.Description}}{{end}}{{if .VisibleFlags}}
+
+OPTIONS:
+   {{range .VisibleFlags}}{{.}}
+   {{end}}{{end}}
+`
+
+// SubcommandHelpTemplate is the text template for the subcommand help topic.
+// cli.go uses text/template to render templates. You can
+// render custom help text by setting this variable.
+var SubcommandHelpTemplate = `NAME:
+   {{.HelpName}} - {{.Usage}}
+
+USAGE:
+   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} command{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Description}}
+
+DESCRIPTION:
+   {{.Description}}{{end}}
+
+COMMANDS:{{range .VisibleCategories}}{{if .Name}}
+   {{.Name}}:{{range .VisibleCommands}}
+     {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}{{else}}{{range .VisibleCommands}}
+   {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
+
+OPTIONS:
+   {{range .VisibleFlags}}{{.}}
+   {{end}}{{end}}
+`
+
+var MarkdownDocTemplate = `% {{ .App.Name }} 8
+
+# NAME
+
+{{ .App.Name }}{{ if .App.Usage }} - {{ .App.Usage }}{{ end }}
+
+# SYNOPSIS
+
+{{ .App.Name }}
+{{ if .SynopsisArgs }}
+` + "```" + `
+{{ range $v := .SynopsisArgs }}{{ $v }}{{ end }}` + "```" + `
+{{ end }}{{ if .App.UsageText }}
+# DESCRIPTION
+
+{{ .App.UsageText }}
+{{ end }}
+**Usage**:
+
+` + "```" + `
+{{ .App.Name }} [GLOBAL OPTIONS] command [COMMAND OPTIONS] [ARGUMENTS...]
+` + "```" + `
+{{ if .GlobalArgs }}
+# GLOBAL OPTIONS
+{{ range $v := .GlobalArgs }}
+{{ $v }}{{ end }}
+{{ end }}{{ if .Commands }}
+# COMMANDS
+{{ range $v := .Commands }}
+{{ $v }}{{ end }}{{ end }}`
+
+var FishCompletionTemplate = `# {{ .App.Name }} fish shell completion
+
+function __fish_{{ .App.Name }}_no_subcommand --description 'Test if there has been any subcommand yet'
+    for i in (commandline -opc)
+        if contains -- $i{{ range $v := .AllCommands }} {{ $v }}{{ end }}
+            return 1
+        end
+    end
+    return 0
+end
+
+{{ range $v := .Completions }}{{ $v }}
+{{ end }}`
diff --git a/vendor/gopkg.in/urfave/cli.v2/.gitignore b/vendor/gopkg.in/urfave/cli.v2/.gitignore
deleted file mode 100644
index faf70c4c..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-*.coverprofile
-node_modules/
diff --git a/vendor/gopkg.in/urfave/cli.v2/.travis.yml b/vendor/gopkg.in/urfave/cli.v2/.travis.yml
deleted file mode 100644
index dea17906..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/.travis.yml
+++ /dev/null
@@ -1,28 +0,0 @@
-language: go
-sudo: false
-dist: trusty
-osx_image: xcode8.3
-go: 1.8.x
-
-os:
-- linux
-- osx
-
-cache:
-  directories:
-  - node_modules
-
-before_script:
-- if [[ $(uname) == Darwin ]]; then
-    sudo pip2 install flake8;
-  else
-    pip install --user flake8;
-  fi
-- mkdir -p ${GOPATH%%:*}/src/gopkg.in/urfave
-- rm -rvf ${GOPATH%%:*}/src/gopkg.in/urfave/cli.v2
-- rm -rvf ${GOPATH%%:*}/pkg/*/gopkg.in/urfave/cli.v2.a
-- ln -sv ${TRAVIS_BUILD_DIR} ${GOPATH%%:*}/src/gopkg.in/urfave/cli.v2
-
-script:
-- flake8 runtests cli-v1-to-v2 generate-flag-types
-- make all
diff --git a/vendor/gopkg.in/urfave/cli.v2/CHANGELOG.md b/vendor/gopkg.in/urfave/cli.v2/CHANGELOG.md
deleted file mode 100644
index 5fa0ca0a..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/CHANGELOG.md
+++ /dev/null
@@ -1,431 +0,0 @@
-# Change Log
-
-**ATTN**: This project uses [semantic versioning](http://semver.org/).
-
-## 2.0.0 - (unreleased 2.x series)
-### Added
-- `NewStringSlice` and `NewIntSlice` for creating their related types
-- `Float64SliceFlag` for unmarshaling a list of floats from the user
-- `Context.Lineage` to get all contexts from current up to global
-- `Context.LocalFlagNames` to get the flag names from *only* the current context
-- `BoolFlag.Value` to handle both default-false and default-true
-
-### Changed
-- `Context.FlagNames` now returns all flags in the context lineage
-- `Context.IsSet` now considers the full context lineage
-
-### Removed
-- the ability to specify `&StringSlice{...string}` or `&IntSlice{...int}`.
-  To migrate to the new API, you may choose to run [the migrator
-  (python) script](./cli-v1-to-v2).
-- The optimistic reordering of arguments and flags introduced by
-  https://github.com/codegangsta/cli/pull/36. This behavior only worked when
-  all arguments appeared before all flags, but caused [weird issues with boolean
-  flags](https://github.com/codegangsta/cli/issues/103) and [reordering of the
-  arguments](https://github.com/codegangsta/cli/issues/355) when the user
-  attempted to mix flags and arguments. Given the trade-offs we removed support
-  for this reordering.
-- adapter code for deprecated `Action` func signature
-- deprecated `App.Author`, `App.Email`, and `Command.ShortName` fields
-- All `Context.Global*` methods, as the non-global versions now traverse up
-  the context lineage automatically.
-- `Context.Parent` method, as this is now available via `Context.Lineage`
-- `BoolTFlag` and related code, as this is now available via `BoolFlag.Value`
-
-## [Unreleased] - (1.x series)
-### Added
-
-### Changed
-
-### Removed
-
-### Fixed
-
-### Deprecated
-
-### Security
-
-## [1.19.1] - 2016-11-21
-### Fixed
-- Fixes regression introduced in 1.19.0 where using an `ActionFunc` as
-  the `Action` for a command would cause it to error rather than calling the
-  function. Should not have a affected declarative cases using `func(c
-  *cli.Context) err)`.
-- Shell completion now handles the case where the user specifies
-  `--generate-bash-completion` immediately after a flag that takes an argument.
-  Previously it call the application with `--generate-bash-completion` as the
-  flag value.
-
-## [1.19.0] - 2016-11-19
-### Added
-- `FlagsByName` was added to make it easy to sort flags (e.g. `sort.Sort(cli.FlagsByName(app.Flags))`)
-- A `Description` field was added to `App` for a more detailed description of
-  the application (similar to the existing `Description` field on `Command`)
-- Flag type code generation via `go generate`
-- Write to stderr and exit 1 if action returns non-nil error
-- Added support for TOML to the `altsrc` loader
-- `SkipArgReorder` was added to allow users to skip the argument reordering.
-  This is useful if you want to consider all "flags" after an argument as
-  arguments rather than flags (the default behavior of the stdlib `flag`
-  library). This is backported functionality from the [removal of the flag
-  reordering](https://github.com/urfave/cli/pull/398) in the unreleased version
-  2
-- For formatted errors (those implementing `ErrorFormatter`), the errors will
-  be formatted during output. Compatible with `pkg/errors`.
-
-### Changed
-- Raise minimum tested/supported Go version to 1.2+
-
-### Fixed
-- Consider empty environment variables as set (previously environment variables
-  with the equivalent of `""` would be skipped rather than their value used).
-- Return an error if the value in a given environment variable cannot be parsed
-  as the flag type. Previously these errors were silently swallowed.
-- Print full error when an invalid flag is specified (which includes the invalid flag)
-- `App.Writer` defaults to `stdout` when `nil`
-- If no action is specified on a command or app, the help is now printed instead of `panic`ing
-- `App.Metadata` is initialized automatically now (previously was `nil` unless initialized)
-- Correctly show help message if `-h` is provided to a subcommand
-- `context.(Global)IsSet` now respects environment variables. Previously it
-  would return `false` if a flag was specified in the environment rather than
-  as an argument
-- Removed deprecation warnings to STDERR to avoid them leaking to the end-user
-- `altsrc`s import paths were updated to use `gopkg.in/urfave/cli.v1`. This
-  fixes issues that occurred when `gopkg.in/urfave/cli.v1` was imported as well
-  as `altsrc` where Go would complain that the types didn't match
-
-## [1.18.1] - 2016-08-28
-### Fixed
-- Removed deprecation warnings to STDERR to avoid them leaking to the end-user (backported)
-
-## [1.18.0] - 2016-06-27
-### Added
-- `./runtests` test runner with coverage tracking by default
-- testing on OS X
-- testing on Windows
-- `UintFlag`, `Uint64Flag`, and `Int64Flag` types and supporting code
-
-### Changed
-- Use spaces for alignment in help/usage output instead of tabs, making the
-  output alignment consistent regardless of tab width
-
-### Fixed
-- Printing of command aliases in help text
-- Printing of visible flags for both struct and struct pointer flags
-- Display the `help` subcommand when using `CommandCategories`
-- No longer swallows `panic`s that occur within the `Action`s themselves when
-  detecting the signature of the `Action` field
-
-## [1.17.1] - 2016-08-28
-### Fixed
-- Removed deprecation warnings to STDERR to avoid them leaking to the end-user
-
-## [1.17.0] - 2016-05-09
-### Added
-- Pluggable flag-level help text rendering via `cli.DefaultFlagStringFunc`
-- `context.GlobalBoolT` was added as an analogue to `context.GlobalBool`
-- Support for hiding commands by setting `Hidden: true` -- this will hide the
-  commands in help output
-
-### Changed
-- `Float64Flag`, `IntFlag`, and `DurationFlag` default values are no longer
-  quoted in help text output.
-- All flag types now include `(default: {value})` strings following usage when a
-  default value can be (reasonably) detected.
-- `IntSliceFlag` and `StringSliceFlag` usage strings are now more consistent
-  with non-slice flag types
-- Apps now exit with a code of 3 if an unknown subcommand is specified
-  (previously they printed "No help topic for...", but still exited 0. This
-  makes it easier to script around apps built using `cli` since they can trust
-  that a 0 exit code indicated a successful execution.
-- cleanups based on [Go Report Card
-  feedback](https://goreportcard.com/report/github.com/urfave/cli)
-
-## [1.16.1] - 2016-08-28
-### Fixed
-- Removed deprecation warnings to STDERR to avoid them leaking to the end-user
-
-## [1.16.0] - 2016-05-02
-### Added
-- `Hidden` field on all flag struct types to omit from generated help text
-
-### Changed
-- `BashCompletionFlag` (`--enable-bash-completion`) is now omitted from
-generated help text via the `Hidden` field
-
-### Fixed
-- handling of error values in `HandleAction` and `HandleExitCoder`
-
-## [1.15.0] - 2016-04-30
-### Added
-- This file!
-- Support for placeholders in flag usage strings
-- `App.Metadata` map for arbitrary data/state management
-- `Set` and `GlobalSet` methods on `*cli.Context` for altering values after
-parsing.
-- Support for nested lookup of dot-delimited keys in structures loaded from
-YAML.
-
-### Changed
-- The `App.Action` and `Command.Action` now prefer a return signature of
-`func(*cli.Context) error`, as defined by `cli.ActionFunc`.  If a non-nil
-`error` is returned, there may be two outcomes:
-    - If the error fulfills `cli.ExitCoder`, then `os.Exit` will be called
-    automatically
-    - Else the error is bubbled up and returned from `App.Run`
-- Specifying an `Action` with the legacy return signature of
-`func(*cli.Context)` will produce a deprecation message to stderr
-- Specifying an `Action` that is not a `func` type will produce a non-zero exit
-from `App.Run`
-- Specifying an `Action` func that has an invalid (input) signature will
-produce a non-zero exit from `App.Run`
-
-### Deprecated
-- <a name="deprecated-cli-app-runandexitonerror"></a>
-`cli.App.RunAndExitOnError`, which should now be done by returning an error
-that fulfills `cli.ExitCoder` to `cli.App.Run`.
-- <a name="deprecated-cli-app-action-signature"></a> the legacy signature for
-`cli.App.Action` of `func(*cli.Context)`, which should now have a return
-signature of `func(*cli.Context) error`, as defined by `cli.ActionFunc`.
-
-### Fixed
-- Added missing `*cli.Context.GlobalFloat64` method
-
-## [1.14.0] - 2016-04-03 (backfilled 2016-04-25)
-### Added
-- Codebeat badge
-- Support for categorization via `CategorizedHelp` and `Categories` on app.
-
-### Changed
-- Use `filepath.Base` instead of `path.Base` in `Name` and `HelpName`.
-
-### Fixed
-- Ensure version is not shown in help text when `HideVersion` set.
-
-## [1.13.0] - 2016-03-06 (backfilled 2016-04-25)
-### Added
-- YAML file input support.
-- `NArg` method on context.
-
-## [1.12.0] - 2016-02-17 (backfilled 2016-04-25)
-### Added
-- Custom usage error handling.
-- Custom text support in `USAGE` section of help output.
-- Improved help messages for empty strings.
-- AppVeyor CI configuration.
-
-### Changed
-- Removed `panic` from default help printer func.
-- De-duping and optimizations.
-
-### Fixed
-- Correctly handle `Before`/`After` at command level when no subcommands.
-- Case of literal `-` argument causing flag reordering.
-- Environment variable hints on Windows.
-- Docs updates.
-
-## [1.11.1] - 2015-12-21 (backfilled 2016-04-25)
-### Changed
-- Use `path.Base` in `Name` and `HelpName`
-- Export `GetName` on flag types.
-
-### Fixed
-- Flag parsing when skipping is enabled.
-- Test output cleanup.
-- Move completion check to account for empty input case.
-
-## [1.11.0] - 2015-11-15 (backfilled 2016-04-25)
-### Added
-- Destination scan support for flags.
-- Testing against `tip` in Travis CI config.
-
-### Changed
-- Go version in Travis CI config.
-
-### Fixed
-- Removed redundant tests.
-- Use correct example naming in tests.
-
-## [1.10.2] - 2015-10-29 (backfilled 2016-04-25)
-### Fixed
-- Remove unused var in bash completion.
-
-## [1.10.1] - 2015-10-21 (backfilled 2016-04-25)
-### Added
-- Coverage and reference logos in README.
-
-### Fixed
-- Use specified values in help and version parsing.
-- Only display app version and help message once.
-
-## [1.10.0] - 2015-10-06 (backfilled 2016-04-25)
-### Added
-- More tests for existing functionality.
-- `ArgsUsage` at app and command level for help text flexibility.
-
-### Fixed
-- Honor `HideHelp` and `HideVersion` in `App.Run`.
-- Remove juvenile word from README.
-
-## [1.9.0] - 2015-09-08 (backfilled 2016-04-25)
-### Added
-- `FullName` on command with accompanying help output update.
-- Set default `$PROG` in bash completion.
-
-### Changed
-- Docs formatting.
-
-### Fixed
-- Removed self-referential imports in tests.
-
-## [1.8.0] - 2015-06-30 (backfilled 2016-04-25)
-### Added
-- Support for `Copyright` at app level.
-- `Parent` func at context level to walk up context lineage.
-
-### Fixed
-- Global flag processing at top level.
-
-## [1.7.1] - 2015-06-11 (backfilled 2016-04-25)
-### Added
-- Aggregate errors from `Before`/`After` funcs.
-- Doc comments on flag structs.
-- Include non-global flags when checking version and help.
-- Travis CI config updates.
-
-### Fixed
-- Ensure slice type flags have non-nil values.
-- Collect global flags from the full command hierarchy.
-- Docs prose.
-
-## [1.7.0] - 2015-05-03 (backfilled 2016-04-25)
-### Changed
-- `HelpPrinter` signature includes output writer.
-
-### Fixed
-- Specify go 1.1+ in docs.
-- Set `Writer` when running command as app.
-
-## [1.6.0] - 2015-03-23 (backfilled 2016-04-25)
-### Added
-- Multiple author support.
-- `NumFlags` at context level.
-- `Aliases` at command level.
-
-### Deprecated
-- `ShortName` at command level.
-
-### Fixed
-- Subcommand help output.
-- Backward compatible support for deprecated `Author` and `Email` fields.
-- Docs regarding `Names`/`Aliases`.
-
-## [1.5.0] - 2015-02-20 (backfilled 2016-04-25)
-### Added
-- `After` hook func support at app and command level.
-
-### Fixed
-- Use parsed context when running command as subcommand.
-- Docs prose.
-
-## [1.4.1] - 2015-01-09 (backfilled 2016-04-25)
-### Added
-- Support for hiding `-h / --help` flags, but not `help` subcommand.
-- Stop flag parsing after `--`.
-
-### Fixed
-- Help text for generic flags to specify single value.
-- Use double quotes in output for defaults.
-- Use `ParseInt` instead of `ParseUint` for int environment var values.
-- Use `0` as base when parsing int environment var values.
-
-## [1.4.0] - 2014-12-12 (backfilled 2016-04-25)
-### Added
-- Support for environment variable lookup "cascade".
-- Support for `Stdout` on app for output redirection.
-
-### Fixed
-- Print command help instead of app help in `ShowCommandHelp`.
-
-## [1.3.1] - 2014-11-13 (backfilled 2016-04-25)
-### Added
-- Docs and example code updates.
-
-### Changed
-- Default `-v / --version` flag made optional.
-
-## [1.3.0] - 2014-08-10 (backfilled 2016-04-25)
-### Added
-- `FlagNames` at context level.
-- Exposed `VersionPrinter` var for more control over version output.
-- Zsh completion hook.
-- `AUTHOR` section in default app help template.
-- Contribution guidelines.
-- `DurationFlag` type.
-
-## [1.2.0] - 2014-08-02
-### Added
-- Support for environment variable defaults on flags plus tests.
-
-## [1.1.0] - 2014-07-15
-### Added
-- Bash completion.
-- Optional hiding of built-in help command.
-- Optional skipping of flag parsing at command level.
-- `Author`, `Email`, and `Compiled` metadata on app.
-- `Before` hook func support at app and command level.
-- `CommandNotFound` func support at app level.
-- Command reference available on context.
-- `GenericFlag` type.
-- `Float64Flag` type.
-- `BoolTFlag` type.
-- `IsSet` flag helper on context.
-- More flag lookup funcs at context level.
-- More tests &amp; docs.
-
-### Changed
-- Help template updates to account for presence/absence of flags.
-- Separated subcommand help template.
-- Exposed `HelpPrinter` var for more control over help output.
-
-## [1.0.0] - 2013-11-01
-### Added
-- `help` flag in default app flag set and each command flag set.
-- Custom handling of argument parsing errors.
-- Command lookup by name at app level.
-- `StringSliceFlag` type and supporting `StringSlice` type.
-- `IntSliceFlag` type and supporting `IntSlice` type.
-- Slice type flag lookups by name at context level.
-- Export of app and command help functions.
-- More tests &amp; docs.
-
-## 0.1.0 - 2013-07-22
-### Added
-- Initial implementation.
-
-[Unreleased]: https://github.com/urfave/cli/compare/v1.18.0...HEAD
-[1.18.0]: https://github.com/urfave/cli/compare/v1.17.0...v1.18.0
-[1.17.0]: https://github.com/urfave/cli/compare/v1.16.0...v1.17.0
-[1.16.0]: https://github.com/urfave/cli/compare/v1.15.0...v1.16.0
-[1.15.0]: https://github.com/urfave/cli/compare/v1.14.0...v1.15.0
-[1.14.0]: https://github.com/urfave/cli/compare/v1.13.0...v1.14.0
-[1.13.0]: https://github.com/urfave/cli/compare/v1.12.0...v1.13.0
-[1.12.0]: https://github.com/urfave/cli/compare/v1.11.1...v1.12.0
-[1.11.1]: https://github.com/urfave/cli/compare/v1.11.0...v1.11.1
-[1.11.0]: https://github.com/urfave/cli/compare/v1.10.2...v1.11.0
-[1.10.2]: https://github.com/urfave/cli/compare/v1.10.1...v1.10.2
-[1.10.1]: https://github.com/urfave/cli/compare/v1.10.0...v1.10.1
-[1.10.0]: https://github.com/urfave/cli/compare/v1.9.0...v1.10.0
-[1.9.0]: https://github.com/urfave/cli/compare/v1.8.0...v1.9.0
-[1.8.0]: https://github.com/urfave/cli/compare/v1.7.1...v1.8.0
-[1.7.1]: https://github.com/urfave/cli/compare/v1.7.0...v1.7.1
-[1.7.0]: https://github.com/urfave/cli/compare/v1.6.0...v1.7.0
-[1.6.0]: https://github.com/urfave/cli/compare/v1.5.0...v1.6.0
-[1.5.0]: https://github.com/urfave/cli/compare/v1.4.1...v1.5.0
-[1.4.1]: https://github.com/urfave/cli/compare/v1.4.0...v1.4.1
-[1.4.0]: https://github.com/urfave/cli/compare/v1.3.1...v1.4.0
-[1.3.1]: https://github.com/urfave/cli/compare/v1.3.0...v1.3.1
-[1.3.0]: https://github.com/urfave/cli/compare/v1.2.0...v1.3.0
-[1.2.0]: https://github.com/urfave/cli/compare/v1.1.0...v1.2.0
-[1.1.0]: https://github.com/urfave/cli/compare/v1.0.0...v1.1.0
-[1.0.0]: https://github.com/urfave/cli/compare/v0.1.0...v1.0.0
diff --git a/vendor/gopkg.in/urfave/cli.v2/GNUmakefile b/vendor/gopkg.in/urfave/cli.v2/GNUmakefile
deleted file mode 100644
index 4543b198..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/GNUmakefile
+++ /dev/null
@@ -1,37 +0,0 @@
-default: test
-
-deps:
-	go get golang.org/x/tools/cmd/goimports || true
-	go get github.com/urfave/gfmrun/... || true
-	go list ./... \
-		| xargs go list -f '{{ join .Deps "\n" }}{{ printf "\n" }}{{ join .TestImports "\n" }}' \
-		| grep -v github.com/urfave/cli \
-		| xargs go get
-	@if [ ! -f node_modules/.bin/markdown-toc ]; then \
-		npm install markdown-toc ; \
-	fi
-
-gen: deps
-	./runtests gen
-
-vet:
-	./runtests vet
-
-gfmrun:
-	./runtests gfmrun
-
-v1-to-v2:
-	./cli-v1-to-v2 --selftest
-
-migrations:
-	./runtests migrations
-
-toc:
-	./runtests toc
-
-test: deps
-	./runtests test
-
-all: gen vet test gfmrun v1-to-v2 migrations toc
-
-.PHONY: default gen vet test gfmrun migrations toc v1-to-v2 deps all
diff --git a/vendor/gopkg.in/urfave/cli.v2/README.md b/vendor/gopkg.in/urfave/cli.v2/README.md
deleted file mode 100644
index dbe1bf36..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/README.md
+++ /dev/null
@@ -1,1433 +0,0 @@
-cli
-===
-
-[![Build Status](https://travis-ci.org/urfave/cli.svg?branch=master)](https://travis-ci.org/urfave/cli)
-[![Windows Build Status](https://ci.appveyor.com/api/projects/status/rtgk5xufi932pb2v?svg=true)](https://ci.appveyor.com/project/urfave/cli)
-[![GoDoc](https://godoc.org/github.com/urfave/cli?status.svg)](https://godoc.org/github.com/urfave/cli)
-[![codebeat](https://codebeat.co/badges/0a8f30aa-f975-404b-b878-5fab3ae1cc5f)](https://codebeat.co/projects/github-com-urfave-cli)
-[![Go Report Card](https://goreportcard.com/badge/urfave/cli)](https://goreportcard.com/report/urfave/cli)
-[![top level coverage](https://gocover.io/_badge/github.com/urfave/cli?0 "top level coverage")](http://gocover.io/github.com/urfave/cli) /
-[![altsrc coverage](https://gocover.io/_badge/github.com/urfave/cli/altsrc?0 "altsrc coverage")](http://gocover.io/github.com/urfave/cli/altsrc)
-
-**Notice:** This is the library formerly known as
-`github.com/codegangsta/cli` -- Github will automatically redirect requests
-to this repository, but we recommend updating your references for clarity.
-
-cli is a simple, fast, and fun package for building command line apps in Go. The
-goal is to enable developers to write fast and distributable command line
-applications in an expressive way.
-
-<!-- toc -->
-
-- [Overview](#overview)
-- [Installation](#installation)
-  * [Supported platforms](#supported-platforms)
-  * [Using the `v2` branch](#using-the-v2-branch)
-  * [Pinning to the `v1` releases](#pinning-to-the-v1-releases)
-- [Getting Started](#getting-started)
-- [Examples](#examples)
-  * [Arguments](#arguments)
-  * [Flags](#flags)
-    + [Placeholder Values](#placeholder-values)
-    + [Alternate Names](#alternate-names)
-    + [Ordering](#ordering)
-    + [Values from the Environment](#values-from-the-environment)
-    + [Values from alternate input sources (YAML, TOML, and others)](#values-from-alternate-input-sources-yaml-toml-and-others)
-    + [Default Values for help output](#default-values-for-help-output)
-  * [Subcommands](#subcommands)
-  * [Subcommands categories](#subcommands-categories)
-  * [Exit code](#exit-code)
-  * [Shell Completion](#shell-completion)
-    + [Enabling](#enabling)
-    + [Distribution](#distribution)
-    + [Customization](#customization)
-  * [Generated Help Text](#generated-help-text)
-    + [Customization](#customization-1)
-  * [Version Flag](#version-flag)
-    + [Customization](#customization-2)
-  * [Full API Example](#full-api-example)
-- [Contribution Guidelines](#contribution-guidelines)
-
-<!-- tocstop -->
-
-## Overview
-
-Command line apps are usually so tiny that there is absolutely no reason why
-your code should *not* be self-documenting. Things like generating help text and
-parsing command flags/options should not hinder productivity when writing a
-command line app.
-
-**This is where cli comes into play.** cli makes command line programming fun,
-organized, and expressive!
-
-## Installation
-
-Make sure you have a working Go environment.  Go version 1.2+ is supported.  [See
-the install instructions for Go](http://golang.org/doc/install.html).
-
-To install cli, simply run:
-```
-$ go get github.com/urfave/cli
-```
-
-Make sure your `PATH` includes the `$GOPATH/bin` directory so your commands can
-be easily used:
-```
-export PATH=$PATH:$GOPATH/bin
-```
-
-### Supported platforms
-
-cli is tested against multiple versions of Go on Linux, and against the latest
-released version of Go on OS X and Windows.  For full details, see
-[`./.travis.yml`](./.travis.yml) and [`./appveyor.yml`](./appveyor.yml).
-
-### Using the `v2` branch
-
-**Warning**: The `v2` branch is currently unreleased and considered unstable.
-
-There is currently a long-lived branch named `v2` that is intended to land as
-the new `master` branch once development there has settled down.  The current
-`master` branch (mirrored as `v1`) is being manually merged into `v2` on
-an irregular human-based schedule, but generally if one wants to "upgrade" to
-`v2` *now* and accept the volatility (read: "awesomeness") that comes along with
-that, please use whatever version pinning of your preference, such as via
-`gopkg.in`:
-
-```
-$ go get gopkg.in/urfave/cli.v2
-```
-
-``` go
-...
-import (
-  "gopkg.in/urfave/cli.v2" // imports as package "cli"
-)
-...
-```
-
-**NOTE**: There is a [migrator (python) script](./cli-v1-to-v2) available to aid
-with the transition from the v1 to v2 API.
-
-### Pinning to the `v1` releases
-
-Similarly to the section above describing use of the `v2` branch, if one wants
-to avoid any unexpected compatibility pains once `v2` becomes `master`, then
-pinning to `v1` is an acceptable option, e.g.:
-
-```
-$ go get gopkg.in/urfave/cli.v1
-```
-
-``` go
-...
-import (
-  "gopkg.in/urfave/cli.v1" // imports as package "cli"
-)
-...
-```
-
-This will pull the latest tagged `v1` release (e.g. `v1.18.1` at the time of writing).
-
-## Getting Started
-
-One of the philosophies behind cli is that an API should be playful and full of
-discovery. So a cli app can be as little as one line of code in `main()`.
-
-<!-- {
-  "args": ["&#45;&#45;help"],
-  "output": "A new cli application"
-} -->
-``` go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  (&cli.App{}).Run(os.Args)
-}
-```
-
-This app will run and show help text, but is not very useful. Let's give an
-action to execute and some help documentation:
-
-<!-- {
-  "output": "boom! I say!"
-} -->
-``` go
-package main
-
-import (
-  "fmt"
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Name: "boom",
-    Usage: "make an explosive entrance",
-    Action: func(c *cli.Context) error {
-      fmt.Println("boom! I say!")
-      return nil
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-Running this already gives you a ton of functionality, plus support for things
-like subcommands and flags, which are covered below.
-
-## Examples
-
-Being a programmer can be a lonely job. Thankfully by the power of automation
-that is not the case! Let's create a greeter app to fend off our demons of
-loneliness!
-
-Start by creating a directory named `greet`, and within it, add a file,
-`greet.go` with the following code in it:
-
-<!-- {
-  "output": "Hello friend!"
-} -->
-``` go
-package main
-
-import (
-  "fmt"
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Name: "greet",
-    Usage: "fight the loneliness!",
-    Action: func(c *cli.Context) error {
-      fmt.Println("Hello friend!")
-      return nil
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-Install our command to the `$GOPATH/bin` directory:
-
-```
-$ go install
-```
-
-Finally run our new command:
-
-```
-$ greet
-Hello friend!
-```
-
-cli also generates neat help text:
-
-```
-$ greet help
-NAME:
-    greet - fight the loneliness!
-
-USAGE:
-    greet [global options] command [command options] [arguments...]
-
-VERSION:
-    0.0.0
-
-COMMANDS:
-    help, h  Shows a list of commands or help for one command
-
-GLOBAL OPTIONS
-    --version Shows version information
-```
-
-### Arguments
-
-You can lookup arguments by calling the `Args` function on `cli.Context`, e.g.:
-
-<!-- {
-  "output": "Hello \""
-} -->
-``` go
-package main
-
-import (
-  "fmt"
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Action: func(c *cli.Context) error {
-      fmt.Printf("Hello %q", c.Args().Get(0))
-      return nil
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-### Flags
-
-Setting and querying flags is simple.
-
-<!-- {
-  "output": "Hello Nefertiti"
-} -->
-``` go
-package main
-
-import (
-  "fmt"
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Flags: []cli.Flag {
-      &cli.StringFlag{
-        Name: "lang",
-        Value: "english",
-        Usage: "language for the greeting",
-      },
-    },
-    Action: func(c *cli.Context) error {
-      name := "Nefertiti"
-      if c.NArg() > 0 {
-        name = c.Args().Get(0)
-      }
-      if c.String("lang") == "spanish" {
-        fmt.Println("Hola", name)
-      } else {
-        fmt.Println("Hello", name)
-      }
-      return nil
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-You can also set a destination variable for a flag, to which the content will be
-scanned.
-
-<!-- {
-  "output": "Hello someone"
-} -->
-``` go
-package main
-
-import (
-  "os"
-  "fmt"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  var language string
-
-  app := &cli.App{
-    Flags: []cli.Flag {
-      &cli.StringFlag{
-        Name:        "lang",
-        Value:       "english",
-        Usage:       "language for the greeting",
-        Destination: &language,
-      },
-    },
-    Action: func(c *cli.Context) error {
-      name := "someone"
-      if c.NArg() > 0 {
-        name = c.Args().Get(0)
-      }
-      if language == "spanish" {
-        fmt.Println("Hola", name)
-      } else {
-        fmt.Println("Hello", name)
-      }
-      return nil
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-See full list of flags at http://godoc.org/github.com/urfave/cli
-
-#### Placeholder Values
-
-Sometimes it's useful to specify a flag's value within the usage string itself.
-Such placeholders are indicated with back quotes.
-
-For example this:
-
-<!-- {
-  "args": ["&#45;&#45;help"],
-  "output": "&#45;&#45;config FILE, &#45;c FILE"
-} -->
-```go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Flags: []cli.Flag{
-      &cli.StringFlag{
-        Name:    "config",
-        Aliases: []string{"c"},
-        Usage:   "Load configuration from `FILE`",
-      },
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-Will result in help output like:
-
-```
---config FILE, -c FILE   Load configuration from FILE
-```
-
-Note that only the first placeholder is used. Subsequent back-quoted words will
-be left as-is.
-
-#### Alternate Names
-
-You can set alternate (or short) names for flags by providing a comma-delimited
-list for the `Name`. e.g.
-
-<!-- {
-  "args": ["&#45;&#45;help"],
-  "output": "&#45;&#45;lang value, &#45;l value.*language for the greeting.*default: \"english\""
-} -->
-``` go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Flags: []cli.Flag {
-      &cli.StringFlag{
-        Name:    "lang",
-        Aliases: []string{"l"},
-        Value:   "english",
-        Usage:   "language for the greeting",
-      },
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-That flag can then be set with `--lang spanish` or `-l spanish`. Note that
-giving two different forms of the same flag in the same command invocation is an
-error.
-
-#### Ordering
-
-Flags for the application and commands are shown in the order they are defined.
-However, it's possible to sort them from outside this library by using `FlagsByName`
-or `CommandsByName` with `sort`.
-
-For example this:
-
-<!-- {
-  "args": ["&#45;&#45;help"],
-  "output": "add a task to the list\n.*complete a task on the list\n.*\n\n.*\n.*Load configuration from FILE\n.*Language for the greeting.*"
-} -->
-``` go
-package main
-
-import (
-  "os"
-  "sort"
-
-  "github.com/urfave/cli"
-)
-
-func main() {
-  app := &cli.App{
-    Flags: []cli.Flag{
-      &cli.StringFlag{
-        Name:  "lang, l",
-        Value: "english",
-        Usage: "Language for the greeting",
-      },
-      &cli.StringFlag{
-        Name:  "config, c",
-        Usage: "Load configuration from `FILE`",
-      },
-    },
-    Commands: []*cli.Command{
-      {
-        Name:    "complete",
-        Aliases: []string{"c"},
-        Usage:   "complete a task on the list",
-        Action:  func(c *cli.Context) error {
-          return nil
-        },
-      },
-      {
-        Name:    "add",
-        Aliases: []string{"a"},
-        Usage:   "add a task to the list",
-        Action:  func(c *cli.Context) error {
-          return nil
-        },
-      },
-    },
-  }
-
-  sort.Sort(cli.FlagsByName(app.Flags))
-  sort.Sort(cli.CommandsByName(app.Commands))
-
-  app.Run(os.Args)
-}
-```
-
-Will result in help output like:
-
-```
---config FILE, -c FILE  Load configuration from FILE
---lang value, -l value  Language for the greeting (default: "english")
-```
-
-#### Values from the Environment
-
-You can also have the default value set from the environment via `EnvVars`.  e.g.
-
-<!-- {
-  "args": ["&#45;&#45;help"],
-  "output": "language for the greeting.*APP_LANG"
-} -->
-``` go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Flags: []cli.Flag {
-      &cli.StringFlag{
-        Name:    "lang",
-        Aliases: []string{"l"},
-        Value:   "english",
-        Usage:   "language for the greeting",
-        EnvVars: []string{"APP_LANG"},
-      },
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-If `EnvVars` contains more than one string, the first environment variable that
-resolves is used as the default.
-
-<!-- {
-  "args": ["&#45;&#45;help"],
-  "output": "language for the greeting.*LEGACY_COMPAT_LANG.*APP_LANG.*LANG"
-} -->
-``` go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Flags: []cli.Flag{
-      &cli.StringFlag{
-        Name:    "lang",
-        Aliases: []string{"l"},
-        Value:   "english",
-        Usage:   "language for the greeting",
-        EnvVars: []string{"LEGACY_COMPAT_LANG", "APP_LANG", "LANG"},
-      },
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-#### Values from alternate input sources (YAML, TOML, and others)
-
-There is a separate package altsrc that adds support for getting flag values
-from other file input sources.
-
-Currently supported input source formats:
-* YAML
-* TOML
-
-In order to get values for a flag from an alternate input source the following
-code would be added to wrap an existing cli.Flag like below:
-
-``` go
-  altsrc.NewIntFlag(&cli.IntFlag{Name: "test"})
-```
-
-Initialization must also occur for these flags. Below is an example initializing
-getting data from a yaml file below.
-
-``` go
-  command.Before = altsrc.InitInputSourceWithContext(command.Flags, NewYamlSourceFromFlagFunc("load"))
-```
-
-The code above will use the "load" string as a flag name to get the file name of
-a yaml file from the cli.Context.  It will then use that file name to initialize
-the yaml input source for any flags that are defined on that command.  As a note
-the "load" flag used would also have to be defined on the command flags in order
-for this code snipped to work.
-
-Currently only the aboved specified formats are supported but developers can
-add support for other input sources by implementing the
-altsrc.InputSourceContext for their given sources.
-
-Here is a more complete sample of a command using YAML support:
-
-<!-- {
-  "args": ["test-cmd", "&#45;&#45;help"],
-  "output": "&#45&#45;test value.*default: 0"
-} -->
-``` go
-package notmain
-
-import (
-  "fmt"
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-  "gopkg.in/urfave/cli.v2/altsrc"
-)
-
-func main() {
-  flags := []cli.Flag{
-    altsrc.NewIntFlag(&cli.IntFlag{Name: "test"}),
-    &cli.StringFlag{Name: "load"},
-  }
-
-  app := &cli.App{
-    Action: func(c *cli.Context) error {
-      fmt.Println("yaml ist rad")
-      return nil
-    },
-    Before: altsrc.InitInputSourceWithContext(flags, altsrc.NewYamlSourceFromFlagFunc("load")),
-    Flags: flags,
-  }
-
-  app.Run(os.Args)
-}
-```
-
-#### Default Values for help output
-
-Sometimes it's useful to specify a flag's default help-text value within the flag declaration. This can be useful if the default value for a flag is a computed value. The default value can be set via the `DefaultText` struct field.
-
-For example this:
-
-<!-- {
-  "args": ["&#45;&#45;help"],
-  "output": "&#45;&#45;port value"
-} -->
-```go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Flags: []cli.Flag{
-      &cli.IntFlag{
-        Name:    "port",
-        Usage:   "Use a randomized port",
-        Value: 0,
-        DefaultText: "random",
-      },
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-Will result in help output like:
-
-```
---port value  Use a randomized port (default: random)
-```
-
-
-### Subcommands
-
-Subcommands can be defined for a more git-like command line app.
-
-<!-- {
-  "args": ["template", "add"],
-  "output": "new task template: .+"
-} -->
-```go
-package main
-
-import (
-  "fmt"
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Commands: []*cli.Command{
-      {
-        Name:    "add",
-        Aliases: []string{"a"},
-        Usage:   "add a task to the list",
-        Action:  func(c *cli.Context) error {
-          fmt.Println("added task: ", c.Args().First())
-          return nil
-        },
-      },
-      {
-        Name:    "complete",
-        Aliases: []string{"c"},
-        Usage:   "complete a task on the list",
-        Action:  func(c *cli.Context) error {
-          fmt.Println("completed task: ", c.Args().First())
-          return nil
-        },
-      },
-      {
-        Name:        "template",
-        Aliases:     []string{"t"},
-        Usage:       "options for task templates",
-        Subcommands: []*cli.Command{
-          {
-            Name:  "add",
-            Usage: "add a new template",
-            Action: func(c *cli.Context) error {
-              fmt.Println("new task template: ", c.Args().First())
-              return nil
-            },
-          },
-          {
-            Name:  "remove",
-            Usage: "remove an existing template",
-            Action: func(c *cli.Context) error {
-              fmt.Println("removed task template: ", c.Args().First())
-              return nil
-            },
-          },
-        },
-      },
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-### Subcommands categories
-
-For additional organization in apps that have many subcommands, you can
-associate a category for each command to group them together in the help
-output.
-
-E.g.
-
-```go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Commands: []*cli.Command{
-      {
-        Name: "noop",
-      },
-      {
-        Name:     "add",
-        Category: "template",
-      },
-      {
-        Name:     "remove",
-        Category: "template",
-      },
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-Will include:
-
-```
-COMMANDS:
-    noop
-
-  Template actions:
-    add
-    remove
-```
-
-### Exit code
-
-Calling `App.Run` will not automatically call `os.Exit`, which means that by
-default the exit code will "fall through" to being `0`.  An explicit exit code
-may be set by returning a non-nil error that fulfills `cli.ExitCoder`, *or* a
-`cli.MultiError` that includes an error that fulfills `cli.ExitCoder`, e.g.:
-
-``` go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  app := &cli.App{
-    Flags: []cli.Flag{
-      &cli.BoolFlag{
-        Name:  "ginger-crouton",
-        Value: true,
-        Usage: "is it in the soup?",
-      },
-    },
-    Action: func(ctx *cli.Context) error {
-      if !ctx.Bool("ginger-crouton") {
-        return cli.Exit("it is not in the soup", 86)
-      }
-      return nil
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-### Shell Completion
-
-You can enable completion commands by setting the `EnableShellCompletion`
-flag on the `App` object.  By default, this setting will only auto-complete to
-show an app's subcommands, but you can write your own completion methods for
-the App or its subcommands.
-
-<!-- {
-  "args": ["complete", "&#45;&#45;generate&#45;completion"],
-  "output": "laundry"
-} -->
-``` go
-package main
-
-import (
-  "fmt"
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  tasks := []string{"cook", "clean", "laundry", "eat", "sleep", "code"}
-
-  app := &cli.App{
-    EnableShellCompletion: true,
-    Commands: []*cli.Command{
-      {
-        Name:    "complete",
-        Aliases: []string{"c"},
-        Usage:   "complete a task on the list",
-        Action: func(c *cli.Context) error {
-           fmt.Println("completed task: ", c.Args().First())
-           return nil
-        },
-        ShellComplete: func(c *cli.Context) {
-          // This will complete if no args are passed
-          if c.NArg() > 0 {
-            return
-          }
-          for _, t := range tasks {
-            fmt.Println(t)
-          }
-        },
-      },
-    },
-  }
-
-  app.Run(os.Args)
-}
-```
-
-#### Enabling
-
-You can generate bash or zsh completion code by using the flag `--init-completion bash` or `--init-completion zsh`.
-
-To setup for bash:
-
-```
-eval "`myprogram --init-completion bash`"
-```
-
-Alternatively, you can put the completion code in your `.bashrc` file:
-```
-myprogram --init-completion bash >> ~/.bashrc
-```
-
-#### Distribution
-
-Copy `autocomplete/bash_autocomplete` into `/etc/bash_completion.d/` and rename
-it to the name of the program you wish to add autocomplete support for (or
-automatically install it there if you are distributing a package). Don't forget
-to source the file to make it active in the current shell.
-
-```
-sudo cp src/bash_autocomplete /etc/bash_completion.d/<myprogram>
-source /etc/bash_completion.d/<myprogram>
-```
-
-Alternatively, you can just document that users should source the generic
-`autocomplete/bash_autocomplete` in their bash configuration with `$PROG` set
-to the name of their program (as above).
-
-#### Customization
-
-The default shell completion flag (`--generate-completion`) is defined as
-`cli.GenerateCompletionFlag`, and may be redefined if desired, e.g.:
-
-<!-- {
-  "args": ["&#45;&#45;compgen"],
-  "output": "wat\nhelp\nh"
-} -->
-``` go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  cli.GenerateCompletionFlag = &cli.BoolFlag{
-    Name:   "compgen",
-    Hidden: true,
-  }
-
-  app := &cli.App{
-    EnableShellCompletion: true,
-    Commands: []*cli.Command{
-      {
-        Name: "wat",
-      },
-    },
-  }
-  app.Run(os.Args)
-}
-```
-
-### Generated Help Text
-
-The default help flag (`-h/--help`) is defined as `cli.HelpFlag` and is checked
-by the cli internals in order to print generated help text for the app, command,
-or subcommand, and break execution.
-
-#### Customization
-
-All of the help text generation may be customized, and at multiple levels.  The
-templates are exposed as variables `AppHelpTemplate`, `CommandHelpTemplate`, and
-`SubcommandHelpTemplate` which may be reassigned or augmented, and full override
-is possible by assigning a compatible func to the `cli.HelpPrinter` variable,
-e.g.:
-
-<!-- {
-  "output": "Ha HA.  I pwnd the help!!1"
-} -->
-``` go
-package main
-
-import (
-  "fmt"
-  "io"
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  // EXAMPLE: Append to an existing template
-  cli.AppHelpTemplate = fmt.Sprintf(`%s
-
-WEBSITE: http://awesometown.example.com
-
-SUPPORT: support@awesometown.example.com
-
-`, cli.AppHelpTemplate)
-
-  // EXAMPLE: Override a template
-  cli.AppHelpTemplate = `NAME:
-   {{.Name}} - {{.Usage}}
-USAGE:
-   {{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}
-   {{if len .Authors}}
-AUTHOR:
-   {{range .Authors}}{{ . }}{{end}}
-   {{end}}{{if .Commands}}
-COMMANDS:
-{{range .Commands}}{{if not .HideHelp}}   {{join .Names ", "}}{{ "\t"}}{{.Usage}}{{ "\n" }}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
-GLOBAL OPTIONS:
-   {{range .VisibleFlags}}{{.}}
-   {{end}}{{end}}{{if .Copyright }}
-COPYRIGHT:
-   {{.Copyright}}
-   {{end}}{{if .Version}}
-VERSION:
-   {{.Version}}
-   {{end}}
-`
-
-  // EXAMPLE: Replace the `HelpPrinter` func
-  cli.HelpPrinter = func(w io.Writer, templ string, data interface{}) {
-    fmt.Println("Ha HA.  I pwnd the help!!1")
-  }
-
-  (&cli.App{}).Run(os.Args)
-}
-```
-
-The default flag may be customized to something other than `-h/--help` by
-setting `cli.HelpFlag`, e.g.:
-
-<!-- {
-  "args": ["&#45;&#45halp"],
-  "output": "haaaaalp.*HALP"
-} -->
-``` go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  cli.HelpFlag = &cli.BoolFlag{
-    Name: "haaaaalp", Aliases: []string{"halp"},
-    Usage: "HALP",
-    EnvVars: []string{"SHOW_HALP", "HALPPLZ"},
-  }
-
-  (&cli.App{}).Run(os.Args)
-}
-```
-
-### Version Flag
-
-The default version flag (`-v/--version`) is defined as `cli.VersionFlag`, which
-is checked by the cli internals in order to print the `App.Version` via
-`cli.VersionPrinter` and break execution.
-
-#### Customization
-
-The default flag may be customized to something other than `-v/--version` by
-setting `cli.VersionFlag`, e.g.:
-
-<!-- {
-  "args": ["&#45;&#45print-version"],
-  "output": "partay version v19\\.99\\.0"
-} -->
-``` go
-package main
-
-import (
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func main() {
-  cli.VersionFlag = &cli.BoolFlag{
-    Name: "print-version", Aliases: []string{"V"},
-    Usage: "print only the version",
-  }
-
-  app := &cli.App{
-    Name: "partay",
-    Version: "v19.99.0",
-  }
-  app.Run(os.Args)
-}
-```
-
-Alternatively, the version printer at `cli.VersionPrinter` may be overridden, e.g.:
-
-<!-- {
-  "args": ["&#45;&#45version"],
-  "output": "version=v19\\.99\\.0 revision=fafafaf"
-} -->
-``` go
-package main
-
-import (
-  "fmt"
-  "os"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-var (
-  Revision = "fafafaf"
-)
-
-func main() {
-  cli.VersionPrinter = func(c *cli.Context) {
-    fmt.Printf("version=%s revision=%s\n", c.App.Version, Revision)
-  }
-
-  app := &cli.App{
-    Name: "partay",
-    Version: "v19.99.0",
-  }
-  app.Run(os.Args)
-}
-```
-
-### Full API Example
-
-**Notice**: This is a contrived (functioning) example meant strictly for API
-demonstration purposes.  Use of one's imagination is encouraged.
-
-<!-- {
-  "output": "made it!\nPhew!"
-} -->
-``` go
-package main
-
-import (
-  "errors"
-  "flag"
-  "fmt"
-  "io"
-  "io/ioutil"
-  "os"
-  "time"
-
-  "gopkg.in/urfave/cli.v2"
-)
-
-func init() {
-  cli.AppHelpTemplate += "\nCUSTOMIZED: you bet ur muffins\n"
-  cli.CommandHelpTemplate += "\nYMMV\n"
-  cli.SubcommandHelpTemplate += "\nor something\n"
-
-  cli.HelpFlag = &cli.BoolFlag{Name: "halp"}
-  cli.GenerateCompletionFlag = &cli.BoolFlag{Name: "compgen", Hidden: true}
-  cli.VersionFlag = &cli.BoolFlag{Name: "print-version", Aliases: []string{"V"}}
-
-  cli.HelpPrinter = func(w io.Writer, templ string, data interface{}) {
-    fmt.Fprintf(w, "best of luck to you\n")
-  }
-  cli.VersionPrinter = func(c *cli.Context) {
-    fmt.Fprintf(c.App.Writer, "version=%s\n", c.App.Version)
-  }
-  cli.OsExiter = func(c int) {
-    fmt.Fprintf(cli.ErrWriter, "refusing to exit %d\n", c)
-  }
-  cli.ErrWriter = ioutil.Discard
-  cli.FlagStringer = func(fl cli.Flag) string {
-    return fmt.Sprintf("\t\t%s", fl.Names()[0])
-  }
-}
-
-type hexWriter struct{}
-
-func (w *hexWriter) Write(p []byte) (int, error) {
-  for _, b := range p {
-    fmt.Printf("%x", b)
-  }
-  fmt.Printf("\n")
-
-  return len(p), nil
-}
-
-type genericType struct {
-  s string
-}
-
-func (g *genericType) Set(value string) error {
-  g.s = value
-  return nil
-}
-
-func (g *genericType) String() string {
-  return g.s
-}
-
-func main() {
-  app := cli.App{
-    Name: "kənˈtrīv",
-    Version: "v19.99.0",
-    Compiled: time.Now(),
-    Authors: []*cli.Author{
-      &cli.Author{
-        Name:  "Example Human",
-        Email: "human@example.com",
-      },
-    },
-    Copyright: "(c) 1999 Serious Enterprise",
-    HelpName: "contrive",
-    Usage: "demonstrate available API",
-    UsageText: "contrive - demonstrating the available API",
-    ArgsUsage: "[args and such]",
-    Commands: []*cli.Command{
-      &cli.Command{
-        Name:        "doo",
-        Aliases:     []string{"do"},
-        Category:    "motion",
-        Usage:       "do the doo",
-        UsageText:   "doo - does the dooing",
-        Description: "no really, there is a lot of dooing to be done",
-        ArgsUsage:   "[arrgh]",
-        Flags: []cli.Flag{
-          &cli.BoolFlag{Name: "forever", Aliases: []string{"forevvarr"}},
-        },
-        Subcommands: []*cli.Command{
-          &cli.Command{
-            Name:   "wop",
-            Action: wopAction,
-          },
-        },
-        SkipFlagParsing: false,
-        HideHelp:        false,
-        Hidden:          false,
-        HelpName:        "doo!",
-        ShellComplete: func(c *cli.Context) {
-          fmt.Fprintf(c.App.Writer, "--better\n")
-        },
-        Before: func(c *cli.Context) error {
-          fmt.Fprintf(c.App.Writer, "brace for impact\n")
-          return nil
-        },
-        After: func(c *cli.Context) error {
-          fmt.Fprintf(c.App.Writer, "did we lose anyone?\n")
-          return nil
-        },
-        Action: func(c *cli.Context) error {
-          c.Command.FullName()
-          c.Command.HasName("wop")
-          c.Command.Names()
-          c.Command.VisibleFlags()
-          fmt.Fprintf(c.App.Writer, "dodododododoodododddooooododododooo\n")
-          if c.Bool("forever") {
-            c.Command.Run(c)
-          }
-          return nil
-        },
-        OnUsageError: func(c *cli.Context, err error, isSubcommand bool) error {
-          fmt.Fprintf(c.App.Writer, "for shame\n")
-          return err
-        },
-      },
-    },
-    Flags: []cli.Flag{
-      &cli.BoolFlag{Name: "fancy"},
-      &cli.BoolFlag{Value: true, Name: "fancier"},
-      &cli.DurationFlag{Name: "howlong", Aliases: []string{"H"}, Value: time.Second * 3},
-      &cli.Float64Flag{Name: "howmuch"},
-      &cli.GenericFlag{Name: "wat", Value: &genericType{}},
-      &cli.Int64Flag{Name: "longdistance"},
-      &cli.Int64SliceFlag{Name: "intervals"},
-      &cli.IntFlag{Name: "distance"},
-      &cli.IntSliceFlag{Name: "times"},
-      &cli.StringFlag{Name: "dance-move", Aliases: []string{"d"}},
-      &cli.StringSliceFlag{Name: "names", Aliases: []string{"N"}},
-      &cli.UintFlag{Name: "age"},
-      &cli.Uint64Flag{Name: "bigage"},
-    },
-    EnableShellCompletion: true,
-    HideHelp: false,
-    HideVersion: false,
-    ShellComplete: func(c *cli.Context) {
-      fmt.Fprintf(c.App.Writer, "lipstick\nkiss\nme\nlipstick\nringo\n")
-    },
-    Before: func(c *cli.Context) error {
-      fmt.Fprintf(c.App.Writer, "HEEEERE GOES\n")
-      return nil
-    },
-    After: func(c *cli.Context) error {
-      fmt.Fprintf(c.App.Writer, "Phew!\n")
-      return nil
-    },
-    CommandNotFound: func(c *cli.Context, command string) {
-      fmt.Fprintf(c.App.Writer, "Thar be no %q here.\n", command)
-    },
-    OnUsageError: func(c *cli.Context, err error, isSubcommand bool) error {
-      if isSubcommand {
-        return err
-      }
-
-      fmt.Fprintf(c.App.Writer, "WRONG: %#v\n", err)
-      return nil
-    },
-    Action: func(c *cli.Context) error {
-      cli.DefaultAppComplete(c)
-      cli.HandleExitCoder(errors.New("not an exit coder, though"))
-      cli.ShowAppHelp(c)
-      cli.ShowCommandCompletions(c, "nope")
-      cli.ShowCommandHelp(c, "also-nope")
-      cli.ShowCompletions(c)
-      cli.ShowSubcommandHelp(c)
-      cli.ShowVersion(c)
-
-      categories := c.App.Categories
-      categories.AddCommand("sounds", &cli.Command{
-        Name: "bloop",
-      })
-
-      for _, category := range c.App.Categories.Categories() {
-        fmt.Fprintf(c.App.Writer, "%s\n", category.Name)
-        fmt.Fprintf(c.App.Writer, "%#v\n", category.VisibleCommands())
-        fmt.Fprintf(c.App.Writer, "%#v\n", category.VisibleCommands())
-      }
-
-      fmt.Printf("%#v\n", c.App.Command("doo"))
-      if c.Bool("infinite") {
-        c.App.Run([]string{"app", "doo", "wop"})
-      }
-
-      if c.Bool("forevar") {
-        c.App.RunAsSubcommand(c)
-      }
-      c.App.Setup()
-      fmt.Printf("%#v\n", c.App.VisibleCategories())
-      fmt.Printf("%#v\n", c.App.VisibleCommands())
-      fmt.Printf("%#v\n", c.App.VisibleFlags())
-
-      fmt.Printf("%#v\n", c.Args().First())
-      if c.Args().Len() > 0 {
-        fmt.Printf("%#v\n", c.Args().Get(1))
-      }
-      fmt.Printf("%#v\n", c.Args().Present())
-      fmt.Printf("%#v\n", c.Args().Tail())
-
-      set := flag.NewFlagSet("contrive", 0)
-      nc := cli.NewContext(c.App, set, c)
-
-      fmt.Printf("%#v\n", nc.Args())
-      fmt.Printf("%#v\n", nc.Bool("nope"))
-      fmt.Printf("%#v\n", !nc.Bool("nerp"))
-      fmt.Printf("%#v\n", nc.Duration("howlong"))
-      fmt.Printf("%#v\n", nc.Float64("hay"))
-      fmt.Printf("%#v\n", nc.Generic("bloop"))
-      fmt.Printf("%#v\n", nc.Int64("bonk"))
-      fmt.Printf("%#v\n", nc.Int64Slice("burnks"))
-      fmt.Printf("%#v\n", nc.Int("bips"))
-      fmt.Printf("%#v\n", nc.IntSlice("blups"))
-      fmt.Printf("%#v\n", nc.String("snurt"))
-      fmt.Printf("%#v\n", nc.StringSlice("snurkles"))
-      fmt.Printf("%#v\n", nc.Uint("flub"))
-      fmt.Printf("%#v\n", nc.Uint64("florb"))
-
-      fmt.Printf("%#v\n", nc.FlagNames())
-      fmt.Printf("%#v\n", nc.IsSet("wat"))
-      fmt.Printf("%#v\n", nc.Set("wat", "nope"))
-      fmt.Printf("%#v\n", nc.NArg())
-      fmt.Printf("%#v\n", nc.NumFlags())
-      fmt.Printf("%#v\n", nc.Lineage()[1])
-
-      nc.Set("wat", "also-nope")
-
-      ec := cli.Exit("ohwell", 86)
-      fmt.Fprintf(c.App.Writer, "%d", ec.ExitCode())
-      fmt.Printf("made it!\n")
-      return ec
-    },
-    Metadata: map[string]interface{}{
-      "layers":          "many",
-      "explicable":      false,
-      "whatever-values": 19.99,
-    },
-  }
-
-  if os.Getenv("HEXY") != "" {
-    app.Writer = &hexWriter{}
-    app.ErrWriter = &hexWriter{}
-  }
-
-  app.Run(os.Args)
-}
-
-func wopAction(c *cli.Context) error {
-  fmt.Fprintf(c.App.Writer, ":wave: over here, eh\n")
-  return nil
-}
-```
-
-## Contribution Guidelines
-
-Feel free to put up a pull request to fix a bug or maybe add a feature. I will
-give it a code review and make sure that it does not break backwards
-compatibility. If I or any other collaborators agree that it is in line with
-the vision of the project, we will work with you to get the code into
-a mergeable state and merge it into the master branch.
-
-If you have contributed something significant to the project, we will most
-likely add you as a collaborator. As a collaborator you are given the ability
-to merge others pull requests. It is very important that new code does not
-break existing code, so be careful about what code you do choose to merge.
-
-If you feel like you have contributed to the project but have not yet been
-added as a collaborator, we probably forgot to add you, please open an issue.
diff --git a/vendor/gopkg.in/urfave/cli.v2/altsrc/altsrc.go b/vendor/gopkg.in/urfave/cli.v2/altsrc/altsrc.go
deleted file mode 100644
index ac34bf63..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/altsrc/altsrc.go
+++ /dev/null
@@ -1,3 +0,0 @@
-package altsrc
-
-//go:generate python ../generate-flag-types altsrc -i ../flag-types.json -o flag_generated.go
diff --git a/vendor/gopkg.in/urfave/cli.v2/altsrc/flag_generated.go b/vendor/gopkg.in/urfave/cli.v2/altsrc/flag_generated.go
deleted file mode 100644
index 87c7c5d2..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/altsrc/flag_generated.go
+++ /dev/null
@@ -1,373 +0,0 @@
-package altsrc
-
-import (
-	"flag"
-
-	"gopkg.in/urfave/cli.v2"
-)
-
-// WARNING: This file is generated!
-
-// BoolFlag is the flag type that wraps cli.BoolFlag to allow
-// for other values to be specified
-type BoolFlag struct {
-	*cli.BoolFlag
-	set *flag.FlagSet
-}
-
-// NewBoolFlag creates a new BoolFlag
-func NewBoolFlag(fl *cli.BoolFlag) *BoolFlag {
-	return &BoolFlag{BoolFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped BoolFlag.Apply
-func (f *BoolFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.BoolFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped BoolFlag.ApplyWithError
-func (f *BoolFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.BoolFlag.ApplyWithError(set)
-}
-
-// DurationFlag is the flag type that wraps cli.DurationFlag to allow
-// for other values to be specified
-type DurationFlag struct {
-	*cli.DurationFlag
-	set *flag.FlagSet
-}
-
-// NewDurationFlag creates a new DurationFlag
-func NewDurationFlag(fl *cli.DurationFlag) *DurationFlag {
-	return &DurationFlag{DurationFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped DurationFlag.Apply
-func (f *DurationFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.DurationFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped DurationFlag.ApplyWithError
-func (f *DurationFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.DurationFlag.ApplyWithError(set)
-}
-
-// Float64Flag is the flag type that wraps cli.Float64Flag to allow
-// for other values to be specified
-type Float64Flag struct {
-	*cli.Float64Flag
-	set *flag.FlagSet
-}
-
-// NewFloat64Flag creates a new Float64Flag
-func NewFloat64Flag(fl *cli.Float64Flag) *Float64Flag {
-	return &Float64Flag{Float64Flag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped Float64Flag.Apply
-func (f *Float64Flag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.Float64Flag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped Float64Flag.ApplyWithError
-func (f *Float64Flag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.Float64Flag.ApplyWithError(set)
-}
-
-// GenericFlag is the flag type that wraps cli.GenericFlag to allow
-// for other values to be specified
-type GenericFlag struct {
-	*cli.GenericFlag
-	set *flag.FlagSet
-}
-
-// NewGenericFlag creates a new GenericFlag
-func NewGenericFlag(fl *cli.GenericFlag) *GenericFlag {
-	return &GenericFlag{GenericFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped GenericFlag.Apply
-func (f *GenericFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.GenericFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped GenericFlag.ApplyWithError
-func (f *GenericFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.GenericFlag.ApplyWithError(set)
-}
-
-// Int64Flag is the flag type that wraps cli.Int64Flag to allow
-// for other values to be specified
-type Int64Flag struct {
-	*cli.Int64Flag
-	set *flag.FlagSet
-}
-
-// NewInt64Flag creates a new Int64Flag
-func NewInt64Flag(fl *cli.Int64Flag) *Int64Flag {
-	return &Int64Flag{Int64Flag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped Int64Flag.Apply
-func (f *Int64Flag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.Int64Flag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped Int64Flag.ApplyWithError
-func (f *Int64Flag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.Int64Flag.ApplyWithError(set)
-}
-
-// IntFlag is the flag type that wraps cli.IntFlag to allow
-// for other values to be specified
-type IntFlag struct {
-	*cli.IntFlag
-	set *flag.FlagSet
-}
-
-// NewIntFlag creates a new IntFlag
-func NewIntFlag(fl *cli.IntFlag) *IntFlag {
-	return &IntFlag{IntFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped IntFlag.Apply
-func (f *IntFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.IntFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped IntFlag.ApplyWithError
-func (f *IntFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.IntFlag.ApplyWithError(set)
-}
-
-// IntSliceFlag is the flag type that wraps cli.IntSliceFlag to allow
-// for other values to be specified
-type IntSliceFlag struct {
-	*cli.IntSliceFlag
-	set *flag.FlagSet
-}
-
-// NewIntSliceFlag creates a new IntSliceFlag
-func NewIntSliceFlag(fl *cli.IntSliceFlag) *IntSliceFlag {
-	return &IntSliceFlag{IntSliceFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped IntSliceFlag.Apply
-func (f *IntSliceFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.IntSliceFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped IntSliceFlag.ApplyWithError
-func (f *IntSliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.IntSliceFlag.ApplyWithError(set)
-}
-
-// Int64SliceFlag is the flag type that wraps cli.Int64SliceFlag to allow
-// for other values to be specified
-type Int64SliceFlag struct {
-	*cli.Int64SliceFlag
-	set *flag.FlagSet
-}
-
-// NewInt64SliceFlag creates a new Int64SliceFlag
-func NewInt64SliceFlag(fl *cli.Int64SliceFlag) *Int64SliceFlag {
-	return &Int64SliceFlag{Int64SliceFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped Int64SliceFlag.Apply
-func (f *Int64SliceFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.Int64SliceFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped Int64SliceFlag.ApplyWithError
-func (f *Int64SliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.Int64SliceFlag.ApplyWithError(set)
-}
-
-// Float64SliceFlag is the flag type that wraps cli.Float64SliceFlag to allow
-// for other values to be specified
-type Float64SliceFlag struct {
-	*cli.Float64SliceFlag
-	set *flag.FlagSet
-}
-
-// NewFloat64SliceFlag creates a new Float64SliceFlag
-func NewFloat64SliceFlag(fl *cli.Float64SliceFlag) *Float64SliceFlag {
-	return &Float64SliceFlag{Float64SliceFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped Float64SliceFlag.Apply
-func (f *Float64SliceFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.Float64SliceFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped Float64SliceFlag.ApplyWithError
-func (f *Float64SliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.Float64SliceFlag.ApplyWithError(set)
-}
-
-// StringFlag is the flag type that wraps cli.StringFlag to allow
-// for other values to be specified
-type StringFlag struct {
-	*cli.StringFlag
-	set *flag.FlagSet
-}
-
-// NewStringFlag creates a new StringFlag
-func NewStringFlag(fl *cli.StringFlag) *StringFlag {
-	return &StringFlag{StringFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped StringFlag.Apply
-func (f *StringFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.StringFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped StringFlag.ApplyWithError
-func (f *StringFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.StringFlag.ApplyWithError(set)
-}
-
-// PathFlag is the flag type that wraps cli.PathFlag to allow
-// for other values to be specified
-type PathFlag struct {
-	*cli.PathFlag
-	set *flag.FlagSet
-}
-
-// NewPathFlag creates a new PathFlag
-func NewPathFlag(fl *cli.PathFlag) *PathFlag {
-	return &PathFlag{PathFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped PathFlag.Apply
-func (f *PathFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.PathFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped PathFlag.ApplyWithError
-func (f *PathFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.PathFlag.ApplyWithError(set)
-}
-
-// StringSliceFlag is the flag type that wraps cli.StringSliceFlag to allow
-// for other values to be specified
-type StringSliceFlag struct {
-	*cli.StringSliceFlag
-	set *flag.FlagSet
-}
-
-// NewStringSliceFlag creates a new StringSliceFlag
-func NewStringSliceFlag(fl *cli.StringSliceFlag) *StringSliceFlag {
-	return &StringSliceFlag{StringSliceFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped StringSliceFlag.Apply
-func (f *StringSliceFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.StringSliceFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped StringSliceFlag.ApplyWithError
-func (f *StringSliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.StringSliceFlag.ApplyWithError(set)
-}
-
-// Uint64Flag is the flag type that wraps cli.Uint64Flag to allow
-// for other values to be specified
-type Uint64Flag struct {
-	*cli.Uint64Flag
-	set *flag.FlagSet
-}
-
-// NewUint64Flag creates a new Uint64Flag
-func NewUint64Flag(fl *cli.Uint64Flag) *Uint64Flag {
-	return &Uint64Flag{Uint64Flag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped Uint64Flag.Apply
-func (f *Uint64Flag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.Uint64Flag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped Uint64Flag.ApplyWithError
-func (f *Uint64Flag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.Uint64Flag.ApplyWithError(set)
-}
-
-// UintFlag is the flag type that wraps cli.UintFlag to allow
-// for other values to be specified
-type UintFlag struct {
-	*cli.UintFlag
-	set *flag.FlagSet
-}
-
-// NewUintFlag creates a new UintFlag
-func NewUintFlag(fl *cli.UintFlag) *UintFlag {
-	return &UintFlag{UintFlag: fl, set: nil}
-}
-
-// Apply saves the flagSet for later usage calls, then calls the
-// wrapped UintFlag.Apply
-func (f *UintFlag) Apply(set *flag.FlagSet) {
-	f.set = set
-	f.UintFlag.Apply(set)
-}
-
-// ApplyWithError saves the flagSet for later usage calls, then calls the
-// wrapped UintFlag.ApplyWithError
-func (f *UintFlag) ApplyWithError(set *flag.FlagSet) error {
-	f.set = set
-	return f.UintFlag.ApplyWithError(set)
-}
diff --git a/vendor/gopkg.in/urfave/cli.v2/appveyor.yml b/vendor/gopkg.in/urfave/cli.v2/appveyor.yml
deleted file mode 100644
index 886f0e9d..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/appveyor.yml
+++ /dev/null
@@ -1,36 +0,0 @@
-version: "{build}"
-
-os: Windows Server 2016
-
-image: Visual Studio 2017
-
-clone_folder: c:\gopath\src\github.com\urfave\cli
-
-cache:
-- node_modules
-
-environment:
-  GOPATH: C:\gopath
-  GOVERSION: 1.8.x
-  PYTHON: C:\Python36-x64
-  PYTHON_VERSION: 3.6.x
-  PYTHON_ARCH: 64
-
-install:
-- set PATH=%GOPATH%\bin;C:\go\bin;%PATH%
-- go version
-- go env
-- go get github.com/urfave/gfmrun/...
-- rmdir c:\gopath\src\gopkg.in\urfave\cli.v2 /s /q
-- rmdir c:\gopath\pkg /s /q
-- git clone . c:\gopath\src\gopkg.in\urfave\cli.v2
-- go get -v -t ./...
-- if not exist node_modules\.bin\markdown-toc npm install markdown-toc
-
-build_script:
-- python runtests vet
-- python runtests test
-- python runtests gfmrun
-- python cli-v1-to-v2 --selftest
-- python runtests migrations
-- python runtests toc
diff --git a/vendor/gopkg.in/urfave/cli.v2/cli-v1-to-v2 b/vendor/gopkg.in/urfave/cli.v2/cli-v1-to-v2
deleted file mode 100644
index b815295a..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/cli-v1-to-v2
+++ /dev/null
@@ -1,479 +0,0 @@
-#!/usr/bin/env python
-from __future__ import print_function, unicode_literals
-
-import argparse
-import io
-import logging
-import os
-import re
-import sys
-
-
-_DESCRIPTION = """\
-Migrate arbitrary `.go` sources (mostly) from the v1 to v2 API.
-"""
-_MIGRATORS = []
-
-
-def main(sysargs=sys.argv[:]):
-    parser = argparse.ArgumentParser(
-        description=_DESCRIPTION,
-        formatter_class=argparse.ArgumentDefaultsHelpFormatter)
-    parser.add_argument('path', nargs='*',
-                        type=os.path.abspath, default=os.getcwd())
-    parser.add_argument('-w', '--write', help='write changes back to file',
-                        action='store_true', default=False)
-    parser.add_argument('-q', '--quiet', help='quiet down the logging',
-                        action='store_true', default=False)
-    parser.add_argument('-D', '--debug', help='debug up the logging',
-                        action='store_true',
-                        default=(os.environ.get('DEBUG') != ''))
-    parser.add_argument('--selftest', help='run internal tests',
-                        action='store_true', default=False)
-
-    args = parser.parse_args(sysargs[1:])
-
-    if args.selftest:
-        logging.basicConfig(
-            level=logging.WARN,
-            format='selftest: %(message)s'
-        )
-        test_migrators()
-        return 0
-
-    level = logging.FATAL if args.quiet else logging.INFO
-    level = logging.DEBUG if args.debug else level
-
-    logging.basicConfig(level=level, format='%(message)s')
-
-    paths = args.path
-    if len(paths) == 0:
-        paths = ['.']
-
-    for filepath in _find_candidate_files(paths):
-        updated_source = _update_filepath(filepath)
-        if args.write:
-            logging.info('Updating %s', filepath)
-
-            with io.open(filepath, 'w', encoding='utf-8') as outfile:
-                outfile.write(updated_source)
-        else:
-            logging.info('// Updated %s:', filepath)
-            print(updated_source)
-
-    return 0
-
-
-def _find_candidate_files(paths):
-    for path in paths:
-        if not os.path.isdir(path):
-            yield path
-            continue
-
-        for curdir, dirs, files in os.walk(path):
-            for i, dirname in enumerate(dirs[:]):
-                if dirname.startswith('.'):
-                    dirs.pop(i)
-
-            for filename in files:
-                if not filename.decode('utf-8').endswith('.go'):
-                    continue
-
-                filepath = os.path.join(curdir, filename)
-                if not os.access(filepath, os.R_OK | os.W_OK):
-                    continue
-
-                yield filepath
-
-
-def _update_filepath(filepath):
-    with io.open(filepath, encoding='utf-8') as infile:
-        return _update_source(infile.read())
-
-
-def _update_source(source):
-    for migrator, func in _MIGRATORS:
-        logging.debug('Running %s migrator', migrator)
-        source = func(source)
-    return source
-
-
-def _subfmt(pattern, replfmt, source, flags=re.UNICODE):
-    def repl(match):
-        return replfmt.format(**match.groupdict())
-    return re.sub(pattern, repl, source, flags=flags)
-
-
-def _migrator(func):
-    _MIGRATORS.append((func.__name__.strip('_'), func))
-    return func
-
-
-@_migrator
-def _slice_pointer_types(source):
-    return _subfmt(
-        '(?P<prefix>\\[\\])cli\\.(?P<type>Command|Author){',
-        '{prefix}*cli.{type}{{', source
-    )
-
-
-@_migrator
-def _pointer_type_literal(source):
-    return _subfmt(
-        '(?P<prefix>\\s+)cli\\.(?P<type>Command|Author){',
-        '{prefix}&cli.{type}{{', source
-    )
-
-
-@_migrator
-def _slice_types(source):
-    return _subfmt(
-        '&cli\\.(?P<type>IntSlice|StringSlice){(?P<args>[^}]*)}',
-        'cli.New{type}({args})', source, flags=re.DOTALL | re.UNICODE
-    )
-
-
-@_migrator
-def _flag_literals(source):
-    return _subfmt(
-        '(?P<prefix>\\s+)cli\\.(?P<type>\\w+)Flag{',
-        '{prefix}&cli.{type}Flag{{', source
-    )
-
-
-@_migrator
-def _v1_imports(source):
-    return re.sub(
-        '"(?:github\\.com|gopkg\\.in)/(?:codegangsta|urfave)/cli(?:\\.v1|)"',
-        '"gopkg.in/urfave/cli.v2"', source, flags=re.UNICODE
-    )
-
-
-@_migrator
-def _new_exit_error(source):
-    return re.sub('cli\\.NewExitError', 'cli.Exit', source, flags=re.UNICODE)
-
-
-@_migrator
-def _bool_t_flag(source):
-    return _subfmt(
-        'cli\\.BoolTFlag{(?P<args>[^}]*)}',
-        'cli.BoolFlag{{Value: true,{args}}}',
-        source, flags=re.DOTALL | re.UNICODE
-    )
-
-
-@_migrator
-def _context_args_len(source):
-    return _subfmt(
-        'len\\((?P<prefix>\\S+)\\.Args\\(\\)\\)',
-        '{prefix}.Args().Len()', source
-    )
-
-
-@_migrator
-def _context_args_index(source):
-    return _subfmt(
-        '\\.Args\\(\\)\\[(?P<index>\\d+)\\]',
-        '.Args().Get({index})', source
-    )
-
-
-@_migrator
-def _envvar_string(source):
-    return re.sub(
-        'EnvVar:(?P<ws>\\s+)"(?P<string>[^"]+)"',
-        _envvar_string_repl, source, flags=re.UNICODE
-    )
-
-
-def _envvar_string_repl(match):
-    return 'EnvVars:{ws}[]string{{{value}}}'.format(
-        value=', '.join([
-            '"{}"'.format(s) for s in
-            re.split(
-                '\\s*,\\s*', match.groupdict()['string'],
-                flags=re.UNICODE
-            )
-        ]),
-        **match.groupdict()
-    )
-
-
-@_migrator
-def _flag_name_stringly(source):
-    return re.sub(
-        '(?P<prefix>\\s+)Name:(?P<ws>\\s+)"(?P<string>[^"]+)"',
-        _flag_name_stringly_repl, source, flags=re.UNICODE
-    )
-
-
-def _flag_name_stringly_repl(match):
-    revars = dict(match.groupdict())
-
-    string = revars['string']
-    parts = list(
-        reversed(
-            sorted(
-                filter(lambda s: len(s.strip()) > 0, [
-                    part.strip() for part in string.split(',')
-                ]), key=len
-            )
-        )
-    )
-
-    if len(parts) == 1:
-        return '{prefix}Name:{ws}"{string}"'.format(**revars)
-
-    return (
-        '{prefix}Name:{ws}"{name}", Aliases: []string{{{aliases}}}'
-    ).format(
-        name=parts[0],
-        aliases=', '.join(['"{}"'.format(s) for s in parts[1:]]),
-        **revars
-    )
-
-
-@_migrator
-def _commands_opaque_type(source):
-    return _subfmt(
-        'cli\\.Commands(?P<suffix>[^B])',
-        '[]*cli.Command{suffix}',
-        source
-    )
-
-
-@_migrator
-def _flag_names(source):
-    return re.sub('\\.GetName\\(\\)', '.Names()[0]', source, flags=re.UNICODE)
-
-
-@_migrator
-def _app_categories(source):
-    source = _subfmt(
-        '(?P<prefix>range\\s+\\S+)\\.App\\.Categories\\(\\)',
-        '{prefix}.App.Categories.Categories()', source
-    )
-
-    return re.sub(
-        '\\.App\\.Categories\\(\\)', '.App.Categories',
-        source, flags=re.UNICODE
-    )
-
-
-@_migrator
-def _command_category_commands(source):
-    # XXX: brittle
-    return _subfmt(
-        '(?P<prefix>\\s+category\\.)Commands(?P<suffix>[^(])',
-        '{prefix}VisibleCommands(){suffix}', source
-    )
-
-
-@_migrator
-def _context_bool_t(source):
-    # XXX: probably brittle
-    return _subfmt(
-        '(?P<prefix>\\S+)(?:Global|)BoolT\\(',
-        '!{prefix}Bool(', source
-    )
-
-
-@_migrator
-def _context_global_methods(source):
-    return _subfmt(
-        '\\.Global(?P<method>'
-        'Bool|Duration|Float64|Generic|Int|IntSlice|String|StringSlice|'
-        'FlagNames|IsSet|Set'
-        ')\\(',
-        '.{method}(', source
-    )
-
-
-@_migrator
-def _context_parent(source):
-    # XXX: brittle
-    return re.sub('\\.Parent\\(\\)', '.Lineage()[1]', source, flags=re.UNICODE)
-
-
-@_migrator
-def _app_init(source):
-    return re.sub(
-        'cli\\.NewApp\\(\\)', '(&cli.App{})', source, flags=re.UNICODE
-    )
-
-
-@_migrator
-def _bash_complete(source):
-    return re.sub(
-        'BashComplete:', 'ShellComplete:',
-        re.sub('\\.BashComplete', '.ShellComplete', source, flags=re.UNICODE))
-
-
-@_migrator
-def _enable_bash_completion(source):
-    return re.sub(
-        '\\.EnableBashCompletion', '.EnableShellCompletion', source, flags=re.UNICODE
-    )
-
-
-@_migrator
-def _bash_completion_flag(source):
-    return re.sub(
-        'cli\\.BashCompletionFlag', 'cli.GenerateCompletionFlag', source, flags=re.UNICODE
-    )
-
-
-def test_migrators():
-    import difflib
-
-    for i, (source, expected) in enumerate(_MIGRATOR_TESTS):
-        actual = _update_source(source)
-        if expected != actual:
-            udiff = difflib.unified_diff(
-                expected.splitlines(), actual.splitlines(),
-                fromfile='a/source.go', tofile='b/source.go', lineterm=''
-            )
-            for line in udiff:
-                print(line)
-            raise AssertionError('migrated source does not match expected')
-        logging.warn('Test case %d/%d OK', i+1, len(_MIGRATOR_TESTS))
-
-
-_MIGRATOR_TESTS = (
-    ("""
-\t\t\t&cli.StringSlice{"a", "b", "c"},
-""", """
-\t\t\tcli.NewStringSlice("a", "b", "c"),
-"""),
-    ("""
-\t\tcli.IntFlag{
-\t\t\tName:  "yep",
-\t\t\tValue: 3,
-\t\t}
-""", """
-\t\t&cli.IntFlag{
-\t\t\tName:  "yep",
-\t\t\tValue: 3,
-\t\t}
-"""),
-    ("""
-\t\tapp.Commands = []cli.Command{
-\t\t\t{
-\t\t\t\tName: "whatebbs",
-\t\t\t},
-\t\t}
-""", """
-\t\tapp.Commands = []*cli.Command{
-\t\t\t{
-\t\t\t\tName: "whatebbs",
-\t\t\t},
-\t\t}
-"""),
-    ("""
-\t\tapp.Commands = []cli.Command{
-\t\t\tcli.Command{
-\t\t\t\tName: "whatebbs",
-\t\t\t},
-\t\t}
-""", """
-\t\tapp.Commands = []*cli.Command{
-\t\t\t&cli.Command{
-\t\t\t\tName: "whatebbs",
-\t\t\t},
-\t\t}
-"""),
-    ("""
-\t"github.com/codegangsta/cli"
-\t"github.com/urfave/cli"
-\t"gopkg.in/codegangsta/cli"
-\t"gopkg.in/codegangsta/cli.v1"
-\t"gopkg.in/urfave/cli"
-\t"gopkg.in/urfave/cli.v1"
-""", """
-\t"gopkg.in/urfave/cli.v2"
-\t"gopkg.in/urfave/cli.v2"
-\t"gopkg.in/urfave/cli.v2"
-\t"gopkg.in/urfave/cli.v2"
-\t"gopkg.in/urfave/cli.v2"
-\t"gopkg.in/urfave/cli.v2"
-"""),
-    ("""
-\t\t\t\treturn cli.NewExitError("foo whatebber", 9)
-""", """
-\t\t\t\treturn cli.Exit("foo whatebber", 9)
-"""),
-    ("""
-\t\t\tapp.Flags = []cli.Flag{
-\t\t\t\tcli.StringFlag{
-\t\t\t\t\tName: "aha",
-\t\t\t\t},
-\t\t\t\tcli.BoolTFlag{
-\t\t\t\t\tName: "blurp",
-\t\t\t\t},
-\t\t\t}
-""", """
-\t\t\tapp.Flags = []cli.Flag{
-\t\t\t\t&cli.StringFlag{
-\t\t\t\t\tName: "aha",
-\t\t\t\t},
-\t\t\t\t&cli.BoolFlag{Value: true,
-\t\t\t\t\tName: "blurp",
-\t\t\t\t},
-\t\t\t}
-"""),
-    ("""
-\t\t\tAction = func(c *cli.Context) error {
-\t\t\t\tif c.Args()[4] == "meep" {
-\t\t\t\t\treturn nil
-\t\t\t\t}
-\t\t\t\treturn errors.New("mope")
-\t\t\t}
-""", """
-\t\t\tAction = func(c *cli.Context) error {
-\t\t\t\tif c.Args().Get(4) == "meep" {
-\t\t\t\t\treturn nil
-\t\t\t\t}
-\t\t\t\treturn errors.New("mope")
-\t\t\t}
-"""),
-    ("""
-\t\tapp.Flags = []cli.Flag{
-\t\t\tcli.StringFlag{
-\t\t\t\tName:   "toots",
-\t\t\t\tEnvVar: "TOOTS,TOOTERS",
-\t\t\t},
-\t\t}
-""", """
-\t\tapp.Flags = []cli.Flag{
-\t\t\t&cli.StringFlag{
-\t\t\t\tName:   "toots",
-\t\t\t\tEnvVars: []string{"TOOTS", "TOOTERS"},
-\t\t\t},
-\t\t}
-"""),
-    ("""
-\t\tapp.Flags = []cli.Flag{
-\t\t\tcli.StringFlag{
-\t\t\t\tName:   "t, tootles, toots",
-\t\t\t},
-\t\t}
-""", """
-\t\tapp.Flags = []cli.Flag{
-\t\t\t&cli.StringFlag{
-\t\t\t\tName:   "tootles", Aliases: []string{"toots", "t"},
-\t\t\t},
-\t\t}
-"""),
-    ("""
-\t\tapp := cli.NewApp()
-\t\tapp.HideHelp = true
-""", """
-\t\tapp := (&cli.App{})
-\t\tapp.HideHelp = true
-""")
-)
-
-
-if __name__ == '__main__':
-    sys.exit(main())
diff --git a/vendor/gopkg.in/urfave/cli.v2/flag-types.json b/vendor/gopkg.in/urfave/cli.v2/flag-types.json
deleted file mode 100644
index bd5ec3f7..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/flag-types.json
+++ /dev/null
@@ -1,98 +0,0 @@
-[
-  {
-    "name": "Bool",
-    "type": "bool",
-    "context_default": "false",
-    "parser": "strconv.ParseBool(f.Value.String())"
-  },
-  {
-    "name": "Duration",
-    "type": "time.Duration",
-    "doctail": " (see https://golang.org/pkg/time/#ParseDuration)",
-    "context_default": "0",
-    "parser": "time.ParseDuration(f.Value.String())"
-  },
-  {
-    "name": "Float64",
-    "type": "float64",
-    "context_default": "0",
-    "parser": "strconv.ParseFloat(f.Value.String(), 64)"
-  },
-  {
-    "name": "Generic",
-    "type": "Generic",
-    "dest": false,
-    "context_default": "nil",
-    "context_type": "interface{}"
-  },
-  {
-    "name": "Int64",
-    "type": "int64",
-    "context_default": "0",
-    "parser": "strconv.ParseInt(f.Value.String(), 0, 64)"
-  },
-  {
-    "name": "Int",
-    "type": "int",
-    "context_default": "0",
-    "parser": "strconv.ParseInt(f.Value.String(), 0, 64)",
-    "parser_cast": "int(parsed)"
-  },
-  {
-    "name": "IntSlice",
-    "type": "*IntSlice",
-    "dest": false,
-    "context_default": "nil",
-    "context_type": "[]int",
-    "parser": "(f.Value.(*IntSlice)).Value(), error(nil)"
-  },
-  {
-    "name": "Int64Slice",
-    "type": "*Int64Slice",
-    "dest": false,
-    "context_default": "nil",
-    "context_type": "[]int64",
-    "parser": "(f.Value.(*Int64Slice)).Value(), error(nil)"
-  },
-  {
-    "name": "Float64Slice",
-    "type": "*Float64Slice",
-    "dest": false,
-    "context_default": "nil",
-    "context_type": "[]float64",
-    "parser": "(f.Value.(*Float64Slice)).Value(), error(nil)"
-  },
-  {
-    "name": "String",
-    "type": "string",
-    "context_default": "\"\"",
-    "parser": "f.Value.String(), error(nil)"
-  },
-  {
-    "name": "Path",
-    "type": "string",
-    "context_default": "\"\"",
-    "parser": "f.Value.String(), error(nil)"
-  },
-  {
-    "name": "StringSlice",
-    "type": "*StringSlice",
-    "dest": false,
-    "context_default": "nil",
-    "context_type": "[]string",
-    "parser": "(f.Value.(*StringSlice)).Value(), error(nil)"
-  },
-  {
-    "name": "Uint64",
-    "type": "uint64",
-    "context_default": "0",
-    "parser": "strconv.ParseUint(f.Value.String(), 0, 64)"
-  },
-  {
-    "name": "Uint",
-    "type": "uint",
-    "context_default": "0",
-    "parser": "strconv.ParseUint(f.Value.String(), 0, 64)",
-    "parser_cast": "uint(parsed)"
-  }
-]
diff --git a/vendor/gopkg.in/urfave/cli.v2/flag.go b/vendor/gopkg.in/urfave/cli.v2/flag.go
deleted file mode 100644
index 364362cc..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/flag.go
+++ /dev/null
@@ -1,1034 +0,0 @@
-package cli
-
-import (
-	"encoding/json"
-	"flag"
-	"fmt"
-	"reflect"
-	"regexp"
-	"runtime"
-	"strconv"
-	"strings"
-	"syscall"
-	"time"
-)
-
-const defaultPlaceholder = "value"
-
-var (
-	slPfx = fmt.Sprintf("sl:::%d:::", time.Now().UTC().UnixNano())
-
-	commaWhitespace = regexp.MustCompile("[, ]+.*")
-)
-
-// GenerateCompletionFlag enables completion for all commands and subcommands
-var GenerateCompletionFlag Flag = &BoolFlag{
-	Name:   "generate-completion",
-	Hidden: true,
-}
-
-func genCompName() string {
-	names := GenerateCompletionFlag.Names()
-	if len(names) == 0 {
-		return "generate-completion"
-	}
-	return names[0]
-}
-
-// InitCompletionFlag generates completion code
-var InitCompletionFlag = &StringFlag{
-	Name:  "init-completion",
-	Usage: "generate completion code. Value must be 'bash' or 'zsh'",
-}
-
-// VersionFlag prints the version for the application
-var VersionFlag Flag = &BoolFlag{
-	Name:    "version",
-	Aliases: []string{"v"},
-	Usage:   "print the version",
-}
-
-// HelpFlag prints the help for all commands and subcommands.
-// Set to nil to disable the flag.  The subcommand
-// will still be added unless HideHelp is set to true.
-var HelpFlag Flag = &BoolFlag{
-	Name:    "help",
-	Aliases: []string{"h"},
-	Usage:   "show help",
-}
-
-// FlagStringer converts a flag definition to a string. This is used by help
-// to display a flag.
-var FlagStringer FlagStringFunc = stringifyFlag
-
-// Serializeder is used to circumvent the limitations of flag.FlagSet.Set
-type Serializeder interface {
-	Serialized() string
-}
-
-// FlagsByName is a slice of Flag.
-type FlagsByName []Flag
-
-func (f FlagsByName) Len() int {
-	return len(f)
-}
-
-func (f FlagsByName) Less(i, j int) bool {
-	if len(f[j].Names()) == 0 {
-		return false
-	} else if len(f[i].Names()) == 0 {
-		return true
-	}
-	return f[i].Names()[0] < f[j].Names()[0]
-}
-
-func (f FlagsByName) Swap(i, j int) {
-	f[i], f[j] = f[j], f[i]
-}
-
-// Flag is a common interface related to parsing flags in cli.
-// For more advanced flag parsing techniques, it is recommended that
-// this interface be implemented.
-type Flag interface {
-	fmt.Stringer
-	// Apply Flag settings to the given flag set
-	Apply(*flag.FlagSet)
-	Names() []string
-}
-
-// errorableFlag is an interface that allows us to return errors during apply
-// it allows flags defined in this library to return errors in a fashion backwards compatible
-// TODO remove in v2 and modify the existing Flag interface to return errors
-type errorableFlag interface {
-	Flag
-
-	ApplyWithError(*flag.FlagSet) error
-}
-
-func flagSet(name string, flags []Flag) (*flag.FlagSet, error) {
-	set := flag.NewFlagSet(name, flag.ContinueOnError)
-
-	for _, f := range flags {
-		//TODO remove in v2 when errorableFlag is removed
-		if ef, ok := f.(errorableFlag); ok {
-			if err := ef.ApplyWithError(set); err != nil {
-				return nil, err
-			}
-		} else {
-			f.Apply(set)
-		}
-	}
-	return set, nil
-}
-
-// Generic is a generic parseable type identified by a specific flag
-type Generic interface {
-	Set(value string) error
-	String() string
-}
-
-// Apply takes the flagset and calls Set on the generic flag with the value
-// provided by the user for parsing by the flag
-// Ignores parsing errors
-func (f *GenericFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError takes the flagset and calls Set on the generic flag with the
-// value provided by the user for parsing by the flag
-func (f *GenericFlag) ApplyWithError(set *flag.FlagSet) error {
-	val := f.Value
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				val.Set(envVal)
-				break
-			}
-		}
-	}
-
-	for _, name := range f.Names() {
-		set.Var(val, name, f.Usage)
-	}
-	return nil
-}
-
-// StringSlice wraps a []string to satisfy flag.Value
-type StringSlice struct {
-	slice      []string
-	hasBeenSet bool
-}
-
-// NewStringSlice creates a *StringSlice with default values
-func NewStringSlice(defaults ...string) *StringSlice {
-	return &StringSlice{slice: append([]string{}, defaults...)}
-}
-
-// Set appends the string value to the list of values
-func (f *StringSlice) Set(value string) error {
-	if !f.hasBeenSet {
-		f.slice = []string{}
-		f.hasBeenSet = true
-	}
-
-	if strings.HasPrefix(value, slPfx) {
-		// Deserializing assumes overwrite
-		_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &f.slice)
-		f.hasBeenSet = true
-		return nil
-	}
-
-	f.slice = append(f.slice, value)
-	return nil
-}
-
-// String returns a readable representation of this value (for usage defaults)
-func (f *StringSlice) String() string {
-	return fmt.Sprintf("%s", f.slice)
-}
-
-// Serialized allows StringSlice to fulfill Serializeder
-func (f *StringSlice) Serialized() string {
-	jsonBytes, _ := json.Marshal(f.slice)
-	return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
-}
-
-// Value returns the slice of strings set by this flag
-func (f *StringSlice) Value() []string {
-	return f.slice
-}
-
-// Get returns the slice of strings set by this flag
-func (f *StringSlice) Get() interface{} {
-	return *f
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *StringSliceFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *StringSliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				newVal := NewStringSlice()
-				for _, s := range strings.Split(envVal, ",") {
-					s = strings.TrimSpace(s)
-					if err := newVal.Set(s); err != nil {
-						return fmt.Errorf("could not parse %q as string value for flag %s: %s", envVal, f.Name, err)
-					}
-				}
-				f.Value = newVal
-				break
-			}
-		}
-	}
-
-	if f.Value == nil {
-		f.Value = NewStringSlice()
-	}
-
-	for _, name := range f.Names() {
-		set.Var(f.Value, name, f.Usage)
-	}
-	return nil
-}
-
-// IntSlice wraps an []int to satisfy flag.Value
-type IntSlice struct {
-	slice      []int
-	hasBeenSet bool
-}
-
-// NewIntSlice makes an *IntSlice with default values
-func NewIntSlice(defaults ...int) *IntSlice {
-	return &IntSlice{slice: append([]int{}, defaults...)}
-}
-
-// NewInt64Slice makes an *Int64Slice with default values
-func NewInt64Slice(defaults ...int64) *Int64Slice {
-	return &Int64Slice{slice: append([]int64{}, defaults...)}
-}
-
-// SetInt directly adds an integer to the list of values
-func (i *IntSlice) SetInt(value int) {
-	if !i.hasBeenSet {
-		i.slice = []int{}
-		i.hasBeenSet = true
-	}
-
-	i.slice = append(i.slice, value)
-}
-
-// Set parses the value into an integer and appends it to the list of values
-func (i *IntSlice) Set(value string) error {
-	if !i.hasBeenSet {
-		i.slice = []int{}
-		i.hasBeenSet = true
-	}
-
-	if strings.HasPrefix(value, slPfx) {
-		// Deserializing assumes overwrite
-		_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &i.slice)
-		i.hasBeenSet = true
-		return nil
-	}
-
-	tmp, err := strconv.ParseInt(value, 0, 64)
-	if err != nil {
-		return err
-	}
-
-	i.slice = append(i.slice, int(tmp))
-	return nil
-}
-
-// String returns a readable representation of this value (for usage defaults)
-func (f *IntSlice) String() string {
-	return fmt.Sprintf("%#v", f.slice)
-}
-
-// Serialized allows IntSlice to fulfill Serializeder
-func (i *IntSlice) Serialized() string {
-	jsonBytes, _ := json.Marshal(i.slice)
-	return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
-}
-
-// Value returns the slice of ints set by this flag
-func (i *IntSlice) Value() []int {
-	return i.slice
-}
-
-// Get returns the slice of ints set by this flag
-func (f *IntSlice) Get() interface{} {
-	return *f
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *IntSliceFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *IntSliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				newVal := NewIntSlice()
-				for _, s := range strings.Split(envVal, ",") {
-					s = strings.TrimSpace(s)
-					if err := newVal.Set(s); err != nil {
-						return fmt.Errorf("could not parse %q as int slice value for flag %s: %s", envVal, f.Name, err)
-					}
-				}
-				f.Value = newVal
-				break
-			}
-		}
-	}
-
-	if f.Value == nil {
-		f.Value = NewIntSlice()
-	}
-
-	for _, name := range f.Names() {
-		set.Var(f.Value, name, f.Usage)
-	}
-	return nil
-}
-
-// Int64Slice is an opaque type for []int to satisfy flag.Value
-type Int64Slice struct {
-	slice      []int64
-	hasBeenSet bool
-}
-
-// Set parses the value into an integer and appends it to the list of values
-func (f *Int64Slice) Set(value string) error {
-	if !f.hasBeenSet {
-		f.slice = []int64{}
-		f.hasBeenSet = true
-	}
-
-	if strings.HasPrefix(value, slPfx) {
-		// Deserializing assumes overwrite
-		_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &f.slice)
-		f.hasBeenSet = true
-		return nil
-	}
-
-	tmp, err := strconv.ParseInt(value, 0, 64)
-	if err != nil {
-		return err
-	}
-
-	f.slice = append(f.slice, tmp)
-	return nil
-}
-
-// String returns a readable representation of this value (for usage defaults)
-func (f *Int64Slice) String() string {
-	return fmt.Sprintf("%#v", f.slice)
-}
-
-// Serialized allows Int64Slice to fulfill Serializeder
-func (f *Int64Slice) Serialized() string {
-	jsonBytes, _ := json.Marshal(f.slice)
-	return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
-}
-
-// Value returns the slice of ints set by this flag
-func (f *Int64Slice) Value() []int64 {
-	return f.slice
-}
-
-// Get returns the slice of ints set by this flag
-func (f *Int64Slice) Get() interface{} {
-	return *f
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *Int64SliceFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *Int64SliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				newVal := NewInt64Slice()
-				for _, s := range strings.Split(envVal, ",") {
-					s = strings.TrimSpace(s)
-					if err := newVal.Set(s); err != nil {
-						return fmt.Errorf("could not parse %q as int64 slice value for flag %s: %s", envVal, f.Name, err)
-					}
-				}
-				f.Value = newVal
-				break
-			}
-		}
-	}
-
-	if f.Value == nil {
-		f.Value = NewInt64Slice()
-	}
-
-	for _, name := range f.Names() {
-		set.Var(f.Value, name, f.Usage)
-	}
-	return nil
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *BoolFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *BoolFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				if envVal == "" {
-					f.Value = false
-					break
-				}
-
-				envValBool, err := strconv.ParseBool(envVal)
-				if err != nil {
-					return fmt.Errorf("could not parse %q as bool value for flag %s: %s", envVal, f.Name, err)
-				}
-				f.Value = envValBool
-				break
-			}
-		}
-	}
-
-	for _, name := range f.Names() {
-		if f.Destination != nil {
-			set.BoolVar(f.Destination, name, f.Value, f.Usage)
-			continue
-		}
-		set.Bool(name, f.Value, f.Usage)
-	}
-	return nil
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *StringFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *StringFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				f.Value = envVal
-				break
-			}
-		}
-	}
-
-	for _, name := range f.Names() {
-		if f.Destination != nil {
-			set.StringVar(f.Destination, name, f.Value, f.Usage)
-			continue
-		}
-		set.String(name, f.Value, f.Usage)
-	}
-	return nil
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *PathFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *PathFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				f.Value = envVal
-				break
-			}
-		}
-	}
-
-	for _, name := range f.Names() {
-		if f.Destination != nil {
-			set.StringVar(f.Destination, name, f.Value, f.Usage)
-			continue
-		}
-		set.String(name, f.Value, f.Usage)
-	}
-	return nil
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *IntFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *IntFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValInt, err := strconv.ParseInt(envVal, 0, 64)
-				if err != nil {
-					return fmt.Errorf("could not parse %q as int value for flag %s: %s", envVal, f.Name, err)
-				}
-				f.Value = int(envValInt)
-				break
-			}
-		}
-	}
-
-	for _, name := range f.Names() {
-		if f.Destination != nil {
-			set.IntVar(f.Destination, name, f.Value, f.Usage)
-			continue
-		}
-		set.Int(name, f.Value, f.Usage)
-	}
-	return nil
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *Int64Flag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *Int64Flag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValInt, err := strconv.ParseInt(envVal, 0, 64)
-				if err != nil {
-					return fmt.Errorf("could not parse %q as int value for flag %s: %s", envVal, f.Name, err)
-				}
-
-				f.Value = envValInt
-				break
-			}
-		}
-	}
-
-	for _, name := range f.Names() {
-		if f.Destination != nil {
-			set.Int64Var(f.Destination, name, f.Value, f.Usage)
-			return nil
-		}
-		set.Int64(name, f.Value, f.Usage)
-	}
-	return nil
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *UintFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *UintFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValInt, err := strconv.ParseUint(envVal, 0, 64)
-				if err != nil {
-					return fmt.Errorf("could not parse %q as uint value for flag %s: %s", envVal, f.Name, err)
-				}
-
-				f.Value = uint(envValInt)
-				break
-			}
-		}
-	}
-
-	for _, name := range f.Names() {
-		if f.Destination != nil {
-			set.UintVar(f.Destination, name, f.Value, f.Usage)
-			return nil
-		}
-		set.Uint(name, f.Value, f.Usage)
-	}
-	return nil
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *Uint64Flag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *Uint64Flag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValInt, err := strconv.ParseUint(envVal, 0, 64)
-				if err != nil {
-					return fmt.Errorf("could not parse %q as uint64 value for flag %s: %s", envVal, f.Name, err)
-				}
-
-				f.Value = uint64(envValInt)
-				break
-			}
-		}
-	}
-
-	for _, name := range f.Names() {
-		if f.Destination != nil {
-			set.Uint64Var(f.Destination, name, f.Value, f.Usage)
-			return nil
-		}
-		set.Uint64(name, f.Value, f.Usage)
-	}
-	return nil
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *DurationFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *DurationFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValDuration, err := time.ParseDuration(envVal)
-				if err != nil {
-					return fmt.Errorf("could not parse %q as duration for flag %s: %s", envVal, f.Name, err)
-				}
-
-				f.Value = envValDuration
-				break
-			}
-		}
-	}
-
-	for _, name := range f.Names() {
-		if f.Destination != nil {
-			set.DurationVar(f.Destination, name, f.Value, f.Usage)
-			continue
-		}
-		set.Duration(name, f.Value, f.Usage)
-	}
-	return nil
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *Float64Flag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *Float64Flag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				envValFloat, err := strconv.ParseFloat(envVal, 10)
-				if err != nil {
-					return fmt.Errorf("could not parse %q as float64 value for flag %s: %s", envVal, f.Name, err)
-				}
-
-				f.Value = float64(envValFloat)
-				break
-			}
-		}
-	}
-
-	for _, name := range f.Names() {
-		if f.Destination != nil {
-			set.Float64Var(f.Destination, name, f.Value, f.Usage)
-			continue
-		}
-		set.Float64(name, f.Value, f.Usage)
-	}
-	return nil
-}
-
-// NewFloat64Slice makes a *Float64Slice with default values
-func NewFloat64Slice(defaults ...float64) *Float64Slice {
-	return &Float64Slice{slice: append([]float64{}, defaults...)}
-}
-
-// Float64Slice is an opaque type for []float64 to satisfy flag.Value
-type Float64Slice struct {
-	slice      []float64
-	hasBeenSet bool
-}
-
-// Set parses the value into a float64 and appends it to the list of values
-func (f *Float64Slice) Set(value string) error {
-	if !f.hasBeenSet {
-		f.slice = []float64{}
-		f.hasBeenSet = true
-	}
-
-	if strings.HasPrefix(value, slPfx) {
-		// Deserializing assumes overwrite
-		_ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &f.slice)
-		f.hasBeenSet = true
-		return nil
-	}
-
-	tmp, err := strconv.ParseFloat(value, 64)
-	if err != nil {
-		return err
-	}
-
-	f.slice = append(f.slice, tmp)
-	return nil
-}
-
-// String returns a readable representation of this value (for usage defaults)
-func (f *Float64Slice) String() string {
-	return fmt.Sprintf("%#v", f.slice)
-}
-
-// Serialized allows Float64Slice to fulfill Serializeder
-func (f *Float64Slice) Serialized() string {
-	jsonBytes, _ := json.Marshal(f.slice)
-	return fmt.Sprintf("%s%s", slPfx, string(jsonBytes))
-}
-
-// Value returns the slice of float64s set by this flag
-func (f *Float64Slice) Value() []float64 {
-	return f.slice
-}
-
-// Apply populates the flag given the flag set and environment
-// Ignores errors
-func (f *Float64SliceFlag) Apply(set *flag.FlagSet) {
-	f.ApplyWithError(set)
-}
-
-// ApplyWithError populates the flag given the flag set and environment
-func (f *Float64SliceFlag) ApplyWithError(set *flag.FlagSet) error {
-	if f.EnvVars != nil {
-		for _, envVar := range f.EnvVars {
-			if envVal, ok := syscall.Getenv(envVar); ok {
-				newVal := NewFloat64Slice()
-				for _, s := range strings.Split(envVal, ",") {
-					s = strings.TrimSpace(s)
-					err := newVal.Set(s)
-					if err != nil {
-						fmt.Fprintf(ErrWriter, err.Error())
-					}
-				}
-				f.Value = newVal
-				break
-			}
-		}
-	}
-
-	if f.Value == nil {
-		f.Value = NewFloat64Slice()
-	}
-
-	for _, name := range f.Names() {
-		set.Var(f.Value, name, f.Usage)
-	}
-	return nil
-}
-
-func visibleFlags(fl []Flag) []Flag {
-	visible := []Flag{}
-	for _, flag := range fl {
-		field := flagValue(flag).FieldByName("Hidden")
-		if !field.IsValid() || !field.Bool() {
-			visible = append(visible, flag)
-		}
-	}
-	return visible
-}
-
-func prefixFor(name string) (prefix string) {
-	if len(name) == 1 {
-		prefix = "-"
-	} else {
-		prefix = "--"
-	}
-
-	return
-}
-
-// Returns the placeholder, if any, and the unquoted usage string.
-func unquoteUsage(usage string) (string, string) {
-	for i := 0; i < len(usage); i++ {
-		if usage[i] == '`' {
-			for j := i + 1; j < len(usage); j++ {
-				if usage[j] == '`' {
-					name := usage[i+1 : j]
-					usage = usage[:i] + name + usage[j+1:]
-					return name, usage
-				}
-			}
-			break
-		}
-	}
-	return "", usage
-}
-
-func prefixedNames(names []string, placeholder string) string {
-	var prefixed string
-	for i, name := range names {
-		if name == "" {
-			continue
-		}
-
-		prefixed += prefixFor(name) + name
-		if placeholder != "" {
-			prefixed += " " + placeholder
-		}
-		if i < len(names)-1 {
-			prefixed += ", "
-		}
-	}
-	return prefixed
-}
-
-func withEnvHint(envVars []string, str string) string {
-	envText := ""
-	if envVars != nil && len(envVars) > 0 {
-		prefix := "$"
-		suffix := ""
-		sep := ", $"
-		if runtime.GOOS == "windows" {
-			prefix = "%"
-			suffix = "%"
-			sep = "%, %"
-		}
-		envText = fmt.Sprintf(" [%s%s%s]", prefix, strings.Join(envVars, sep), suffix)
-	}
-	return str + envText
-}
-
-func flagNames(f Flag) []string {
-	ret := []string{}
-
-	name := flagStringField(f, "Name")
-	aliases := flagStringSliceField(f, "Aliases")
-
-	for _, part := range append([]string{name}, aliases...) {
-		// v1 -> v2 migration warning zone:
-		// Strip off anything after the first found comma or space, which
-		// *hopefully* makes it a tiny bit more obvious that unexpected behavior is
-		// caused by using the v1 form of stringly typed "Name".
-		ret = append(ret, commaWhitespace.ReplaceAllString(part, ""))
-	}
-
-	return ret
-}
-
-func flagStringSliceField(f Flag, name string) []string {
-	fv := flagValue(f)
-	field := fv.FieldByName(name)
-
-	if field.IsValid() {
-		return field.Interface().([]string)
-	}
-
-	return []string{}
-}
-
-func flagStringField(f Flag, name string) string {
-	fv := flagValue(f)
-	field := fv.FieldByName(name)
-
-	if field.IsValid() {
-		return field.String()
-	}
-
-	return ""
-}
-
-func flagValue(f Flag) reflect.Value {
-	fv := reflect.ValueOf(f)
-	for fv.Kind() == reflect.Ptr {
-		fv = reflect.Indirect(fv)
-	}
-	return fv
-}
-
-func stringifyFlag(f Flag) string {
-	fv := flagValue(f)
-
-	switch f.(type) {
-	case *IntSliceFlag:
-		return withEnvHint(flagStringSliceField(f, "EnvVars"),
-			stringifyIntSliceFlag(f.(*IntSliceFlag)))
-	case *Int64SliceFlag:
-		return withEnvHint(flagStringSliceField(f, "EnvVars"),
-			stringifyInt64SliceFlag(f.(*Int64SliceFlag)))
-	case *Float64SliceFlag:
-		return withEnvHint(flagStringSliceField(f, "EnvVars"),
-			stringifyFloat64SliceFlag(f.(*Float64SliceFlag)))
-	case *StringSliceFlag:
-		return withEnvHint(flagStringSliceField(f, "EnvVars"),
-			stringifyStringSliceFlag(f.(*StringSliceFlag)))
-	}
-
-	placeholder, usage := unquoteUsage(fv.FieldByName("Usage").String())
-
-	needsPlaceholder := false
-	defaultValueString := ""
-	val := fv.FieldByName("Value")
-	if val.IsValid() {
-		needsPlaceholder = val.Kind() != reflect.Bool
-		defaultValueString = fmt.Sprintf(" (default: %v)", val.Interface())
-
-		if val.Kind() == reflect.String && val.String() != "" {
-			defaultValueString = fmt.Sprintf(" (default: %q)", val.String())
-		}
-	}
-
-	helpText := fv.FieldByName("DefaultText")
-	if helpText.IsValid() && helpText.String() != "" {
-		needsPlaceholder = val.Kind() != reflect.Bool
-		defaultValueString = fmt.Sprintf(" (default: %s)", helpText.String())
-	}
-
-	if defaultValueString == " (default: )" {
-		defaultValueString = ""
-	}
-
-	if needsPlaceholder && placeholder == "" {
-		placeholder = defaultPlaceholder
-	}
-
-	usageWithDefault := strings.TrimSpace(fmt.Sprintf("%s%s", usage, defaultValueString))
-
-	return withEnvHint(flagStringSliceField(f, "EnvVars"),
-		fmt.Sprintf("%s\t%s", prefixedNames(f.Names(), placeholder), usageWithDefault))
-}
-
-func stringifyIntSliceFlag(f *IntSliceFlag) string {
-	defaultVals := []string{}
-	if f.Value != nil && len(f.Value.Value()) > 0 {
-		for _, i := range f.Value.Value() {
-			defaultVals = append(defaultVals, fmt.Sprintf("%d", i))
-		}
-	}
-
-	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
-}
-
-func stringifyInt64SliceFlag(f *Int64SliceFlag) string {
-	defaultVals := []string{}
-	if f.Value != nil && len(f.Value.Value()) > 0 {
-		for _, i := range f.Value.Value() {
-			defaultVals = append(defaultVals, fmt.Sprintf("%d", i))
-		}
-	}
-
-	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
-}
-
-func stringifyFloat64SliceFlag(f *Float64SliceFlag) string {
-	defaultVals := []string{}
-	if f.Value != nil && len(f.Value.Value()) > 0 {
-		for _, i := range f.Value.Value() {
-			defaultVals = append(defaultVals, strings.TrimRight(strings.TrimRight(fmt.Sprintf("%f", i), "0"), "."))
-		}
-	}
-
-	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
-}
-
-func stringifyStringSliceFlag(f *StringSliceFlag) string {
-	defaultVals := []string{}
-	if f.Value != nil && len(f.Value.Value()) > 0 {
-		for _, s := range f.Value.Value() {
-			if len(s) > 0 {
-				defaultVals = append(defaultVals, fmt.Sprintf("%q", s))
-			}
-		}
-	}
-
-	return stringifySliceFlag(f.Usage, f.Names(), defaultVals)
-}
-
-func stringifySliceFlag(usage string, names, defaultVals []string) string {
-	placeholder, usage := unquoteUsage(usage)
-	if placeholder == "" {
-		placeholder = defaultPlaceholder
-	}
-
-	defaultVal := ""
-	if len(defaultVals) > 0 {
-		defaultVal = fmt.Sprintf(" (default: %s)", strings.Join(defaultVals, ", "))
-	}
-
-	usageWithDefault := strings.TrimSpace(fmt.Sprintf("%s%s", usage, defaultVal))
-	return fmt.Sprintf("%s\t%s", prefixedNames(names, placeholder), usageWithDefault)
-}
-
-func hasFlag(flags []Flag, fl Flag) bool {
-	for _, existing := range flags {
-		if fl == existing {
-			return true
-		}
-	}
-
-	return false
-}
diff --git a/vendor/gopkg.in/urfave/cli.v2/flag_generated.go b/vendor/gopkg.in/urfave/cli.v2/flag_generated.go
deleted file mode 100644
index a9581501..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/flag_generated.go
+++ /dev/null
@@ -1,629 +0,0 @@
-package cli
-
-import (
-	"flag"
-	"strconv"
-	"time"
-)
-
-// WARNING: This file is generated!
-
-// BoolFlag is a flag with type bool
-type BoolFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       bool
-	DefaultText string
-
-	Destination *bool
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *BoolFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *BoolFlag) Names() []string {
-	return flagNames(f)
-}
-
-// Bool looks up the value of a local BoolFlag, returns
-// false if not found
-func (c *Context) Bool(name string) bool {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupBool(name, fs)
-	}
-	return false
-}
-
-func lookupBool(name string, set *flag.FlagSet) bool {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := strconv.ParseBool(f.Value.String())
-		if err != nil {
-			return false
-		}
-		return parsed
-	}
-	return false
-}
-
-// DurationFlag is a flag with type time.Duration (see https://golang.org/pkg/time/#ParseDuration)
-type DurationFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       time.Duration
-	DefaultText string
-
-	Destination *time.Duration
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *DurationFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *DurationFlag) Names() []string {
-	return flagNames(f)
-}
-
-// Duration looks up the value of a local DurationFlag, returns
-// 0 if not found
-func (c *Context) Duration(name string) time.Duration {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupDuration(name, fs)
-	}
-	return 0
-}
-
-func lookupDuration(name string, set *flag.FlagSet) time.Duration {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := time.ParseDuration(f.Value.String())
-		if err != nil {
-			return 0
-		}
-		return parsed
-	}
-	return 0
-}
-
-// Float64Flag is a flag with type float64
-type Float64Flag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       float64
-	DefaultText string
-
-	Destination *float64
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *Float64Flag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *Float64Flag) Names() []string {
-	return flagNames(f)
-}
-
-// Float64 looks up the value of a local Float64Flag, returns
-// 0 if not found
-func (c *Context) Float64(name string) float64 {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupFloat64(name, fs)
-	}
-	return 0
-}
-
-func lookupFloat64(name string, set *flag.FlagSet) float64 {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := strconv.ParseFloat(f.Value.String(), 64)
-		if err != nil {
-			return 0
-		}
-		return parsed
-	}
-	return 0
-}
-
-// GenericFlag is a flag with type Generic
-type GenericFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       Generic
-	DefaultText string
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *GenericFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *GenericFlag) Names() []string {
-	return flagNames(f)
-}
-
-// Generic looks up the value of a local GenericFlag, returns
-// nil if not found
-func (c *Context) Generic(name string) interface{} {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupGeneric(name, fs)
-	}
-	return nil
-}
-
-func lookupGeneric(name string, set *flag.FlagSet) interface{} {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := f.Value, error(nil)
-		if err != nil {
-			return nil
-		}
-		return parsed
-	}
-	return nil
-}
-
-// Int64Flag is a flag with type int64
-type Int64Flag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       int64
-	DefaultText string
-
-	Destination *int64
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *Int64Flag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *Int64Flag) Names() []string {
-	return flagNames(f)
-}
-
-// Int64 looks up the value of a local Int64Flag, returns
-// 0 if not found
-func (c *Context) Int64(name string) int64 {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupInt64(name, fs)
-	}
-	return 0
-}
-
-func lookupInt64(name string, set *flag.FlagSet) int64 {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := strconv.ParseInt(f.Value.String(), 0, 64)
-		if err != nil {
-			return 0
-		}
-		return parsed
-	}
-	return 0
-}
-
-// IntFlag is a flag with type int
-type IntFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       int
-	DefaultText string
-
-	Destination *int
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *IntFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *IntFlag) Names() []string {
-	return flagNames(f)
-}
-
-// Int looks up the value of a local IntFlag, returns
-// 0 if not found
-func (c *Context) Int(name string) int {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupInt(name, fs)
-	}
-	return 0
-}
-
-func lookupInt(name string, set *flag.FlagSet) int {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := strconv.ParseInt(f.Value.String(), 0, 64)
-		if err != nil {
-			return 0
-		}
-		return int(parsed)
-	}
-	return 0
-}
-
-// IntSliceFlag is a flag with type *IntSlice
-type IntSliceFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       *IntSlice
-	DefaultText string
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *IntSliceFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *IntSliceFlag) Names() []string {
-	return flagNames(f)
-}
-
-// IntSlice looks up the value of a local IntSliceFlag, returns
-// nil if not found
-func (c *Context) IntSlice(name string) []int {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupIntSlice(name, fs)
-	}
-	return nil
-}
-
-func lookupIntSlice(name string, set *flag.FlagSet) []int {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := (f.Value.(*IntSlice)).Value(), error(nil)
-		if err != nil {
-			return nil
-		}
-		return parsed
-	}
-	return nil
-}
-
-// Int64SliceFlag is a flag with type *Int64Slice
-type Int64SliceFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       *Int64Slice
-	DefaultText string
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *Int64SliceFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *Int64SliceFlag) Names() []string {
-	return flagNames(f)
-}
-
-// Int64Slice looks up the value of a local Int64SliceFlag, returns
-// nil if not found
-func (c *Context) Int64Slice(name string) []int64 {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupInt64Slice(name, fs)
-	}
-	return nil
-}
-
-func lookupInt64Slice(name string, set *flag.FlagSet) []int64 {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := (f.Value.(*Int64Slice)).Value(), error(nil)
-		if err != nil {
-			return nil
-		}
-		return parsed
-	}
-	return nil
-}
-
-// Float64SliceFlag is a flag with type *Float64Slice
-type Float64SliceFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       *Float64Slice
-	DefaultText string
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *Float64SliceFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *Float64SliceFlag) Names() []string {
-	return flagNames(f)
-}
-
-// Float64Slice looks up the value of a local Float64SliceFlag, returns
-// nil if not found
-func (c *Context) Float64Slice(name string) []float64 {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupFloat64Slice(name, fs)
-	}
-	return nil
-}
-
-func lookupFloat64Slice(name string, set *flag.FlagSet) []float64 {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := (f.Value.(*Float64Slice)).Value(), error(nil)
-		if err != nil {
-			return nil
-		}
-		return parsed
-	}
-	return nil
-}
-
-// StringFlag is a flag with type string
-type StringFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       string
-	DefaultText string
-
-	Destination *string
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *StringFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *StringFlag) Names() []string {
-	return flagNames(f)
-}
-
-// String looks up the value of a local StringFlag, returns
-// "" if not found
-func (c *Context) String(name string) string {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupString(name, fs)
-	}
-	return ""
-}
-
-func lookupString(name string, set *flag.FlagSet) string {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := f.Value.String(), error(nil)
-		if err != nil {
-			return ""
-		}
-		return parsed
-	}
-	return ""
-}
-
-// PathFlag is a flag with type string
-type PathFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       string
-	DefaultText string
-
-	Destination *string
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *PathFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *PathFlag) Names() []string {
-	return flagNames(f)
-}
-
-// Path looks up the value of a local PathFlag, returns
-// "" if not found
-func (c *Context) Path(name string) string {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupPath(name, fs)
-	}
-	return ""
-}
-
-func lookupPath(name string, set *flag.FlagSet) string {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := f.Value.String(), error(nil)
-		if err != nil {
-			return ""
-		}
-		return parsed
-	}
-	return ""
-}
-
-// StringSliceFlag is a flag with type *StringSlice
-type StringSliceFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       *StringSlice
-	DefaultText string
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *StringSliceFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *StringSliceFlag) Names() []string {
-	return flagNames(f)
-}
-
-// StringSlice looks up the value of a local StringSliceFlag, returns
-// nil if not found
-func (c *Context) StringSlice(name string) []string {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupStringSlice(name, fs)
-	}
-	return nil
-}
-
-func lookupStringSlice(name string, set *flag.FlagSet) []string {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := (f.Value.(*StringSlice)).Value(), error(nil)
-		if err != nil {
-			return nil
-		}
-		return parsed
-	}
-	return nil
-}
-
-// Uint64Flag is a flag with type uint64
-type Uint64Flag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       uint64
-	DefaultText string
-
-	Destination *uint64
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *Uint64Flag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *Uint64Flag) Names() []string {
-	return flagNames(f)
-}
-
-// Uint64 looks up the value of a local Uint64Flag, returns
-// 0 if not found
-func (c *Context) Uint64(name string) uint64 {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupUint64(name, fs)
-	}
-	return 0
-}
-
-func lookupUint64(name string, set *flag.FlagSet) uint64 {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := strconv.ParseUint(f.Value.String(), 0, 64)
-		if err != nil {
-			return 0
-		}
-		return parsed
-	}
-	return 0
-}
-
-// UintFlag is a flag with type uint
-type UintFlag struct {
-	Name        string
-	Aliases     []string
-	Usage       string
-	EnvVars     []string
-	Hidden      bool
-	Value       uint
-	DefaultText string
-
-	Destination *uint
-}
-
-// String returns a readable representation of this value
-// (for usage defaults)
-func (f *UintFlag) String() string {
-	return FlagStringer(f)
-}
-
-// Names returns the names of the flag
-func (f *UintFlag) Names() []string {
-	return flagNames(f)
-}
-
-// Uint looks up the value of a local UintFlag, returns
-// 0 if not found
-func (c *Context) Uint(name string) uint {
-	if fs := lookupFlagSet(name, c); fs != nil {
-		return lookupUint(name, fs)
-	}
-	return 0
-}
-
-func lookupUint(name string, set *flag.FlagSet) uint {
-	f := set.Lookup(name)
-	if f != nil {
-		parsed, err := strconv.ParseUint(f.Value.String(), 0, 64)
-		if err != nil {
-			return 0
-		}
-		return uint(parsed)
-	}
-	return 0
-}
diff --git a/vendor/gopkg.in/urfave/cli.v2/generate-flag-types b/vendor/gopkg.in/urfave/cli.v2/generate-flag-types
deleted file mode 100644
index d77d4709..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/generate-flag-types
+++ /dev/null
@@ -1,255 +0,0 @@
-#!/usr/bin/env python
-"""
-The flag types that ship with the cli library have many things in common, and
-so we can take advantage of the `go generate` command to create much of the
-source code from a list of definitions.  These definitions attempt to cover
-the parts that vary between flag types, and should evolve as needed.
-
-An example of the minimum definition needed is:
-
-    {
-      "name": "SomeType",
-      "type": "sometype",
-      "context_default": "nil"
-    }
-
-In this example, the code generated for the `cli` package will include a type
-named `SomeTypeFlag` that is expected to wrap a value of type `sometype`.
-Fetching values by name via `*cli.Context` will default to a value of `nil`.
-
-A more complete, albeit somewhat redundant, example showing all available
-definition keys is:
-
-    {
-      "name": "VeryMuchType",
-      "type": "*VeryMuchType",
-      "value": true,
-      "dest": false,
-      "doctail": " which really only wraps a []float64, oh well!",
-      "context_type": "[]float64",
-      "context_default": "nil",
-      "parser": "parseVeryMuchType(f.Value.String())",
-      "parser_cast": "[]float64(parsed)"
-    }
-
-The meaning of each field is as follows:
-
-               name (string) - The type "name", which will be suffixed with
-                               `Flag` when generating the type definition
-                               for `cli` and the wrapper type for `altsrc`
-               type (string) - The type that the generated `Flag` type for
-                               `cli` is expected to "contain" as its `.Value`
-                               member
-                value (bool) - Should the generated `cli` type have a `Value`
-                               member?
-                 dest (bool) - Should the generated `cli` type support a
-                               destination pointer?
-            doctail (string) - Additional docs for the `cli` flag type comment
-       context_type (string) - The literal type used in the `*cli.Context`
-                               reader func signature
-    context_default (string) - The literal value used as the default by the
-                               `*cli.Context` reader funcs when no value is
-                               present
-             parser (string) - Literal code used to parse the flag `f`,
-                               expected to have a return signature of
-                               (value, error)
-        parser_cast (string) - Literal code used to cast the `parsed` value
-                               returned from the `parser` code
-"""
-
-from __future__ import print_function, unicode_literals
-
-import argparse
-import json
-import os
-import subprocess
-import sys
-import tempfile
-import textwrap
-
-
-_PY3 = sys.version_info.major == 3
-
-
-class _FancyFormatter(argparse.ArgumentDefaultsHelpFormatter,
-                      argparse.RawDescriptionHelpFormatter):
-    pass
-
-
-def main(sysargs=sys.argv[:]):
-    parser = argparse.ArgumentParser(
-        description='Generate flag type code!',
-        formatter_class=_FancyFormatter)
-    parser.add_argument(
-        'package',
-        type=str, default='cli', choices=_WRITEFUNCS.keys(),
-        help='Package for which flag types will be generated'
-    )
-    parser.add_argument(
-        '-i', '--in-json',
-        type=argparse.FileType('r'),
-        default=sys.stdin,
-        help='Input JSON file which defines each type to be generated'
-    )
-    parser.add_argument(
-        '-o', '--out-go',
-        type=argparse.FileType('w'),
-        default=sys.stdout,
-        help='Output file/stream to which generated source will be written'
-    )
-    parser.epilog = __doc__
-
-    args = parser.parse_args(sysargs[1:])
-    _generate_flag_types(_WRITEFUNCS[args.package], args.out_go, args.in_json)
-    return 0
-
-
-def _generate_flag_types(writefunc, output_go, input_json):
-    types = json.load(input_json)
-
-    tmp = _get_named_tmp_go()
-    writefunc(tmp, types)
-    tmp.close()
-
-    new_content = subprocess.check_output(
-        ['goimports', tmp.name]
-    ).decode('utf-8')
-
-    print(new_content, file=output_go, end='')
-    output_go.flush()
-    os.remove(tmp.name)
-
-
-def _get_named_tmp_go():
-    tmp_args = dict(suffix='.go', mode='w', delete=False)
-    if _PY3:
-        tmp_args['encoding'] = 'utf-8'
-    return tempfile.NamedTemporaryFile(**tmp_args)
-
-
-def _set_typedef_defaults(typedef):
-    typedef.setdefault('doctail', '')
-    typedef.setdefault('context_type', typedef['type'])
-    typedef.setdefault('dest', True)
-    typedef.setdefault('parser', 'f.Value, error(nil)')
-    typedef.setdefault('parser_cast', 'parsed')
-
-
-def _write_cli_flag_types(outfile, types):
-    _fwrite(outfile, """\
-        package cli
-
-        // WARNING: This file is generated!
-
-        """)
-
-    for typedef in types:
-        _set_typedef_defaults(typedef)
-
-        _fwrite(outfile, """\
-        // {name}Flag is a flag with type {type}{doctail}
-        type {name}Flag struct {{
-            Name string
-            Aliases []string
-            Usage string
-            EnvVars []string
-            Hidden bool
-            Value {type}
-            DefaultText string
-        """.format(**typedef))
-
-        if typedef['dest']:
-            _fwrite(outfile, """\
-            Destination *{type}
-            """.format(**typedef))
-
-        _fwrite(outfile, "\n}\n\n")
-
-        _fwrite(outfile, """\
-            // String returns a readable representation of this value
-            // (for usage defaults)
-            func (f *{name}Flag) String() string {{
-                return FlagStringer(f)
-            }}
-
-            // Names returns the names of the flag
-            func (f *{name}Flag) Names() []string {{
-                return flagNames(f)
-            }}
-
-            // {name} looks up the value of a local {name}Flag, returns
-            // {context_default} if not found
-            func (c *Context) {name}(name string) {context_type} {{
-                if fs := lookupFlagSet(name, c); fs != nil {{
-                    return lookup{name}(name, fs)
-                }}
-                return {context_default}
-            }}
-
-            func lookup{name}(name string, set *flag.FlagSet) {context_type} {{
-                f := set.Lookup(name)
-                if f != nil {{
-                    parsed, err := {parser}
-                    if err != nil {{
-                        return {context_default}
-                    }}
-                    return {parser_cast}
-                }}
-                return {context_default}
-            }}
-            """.format(**typedef))
-
-
-def _write_altsrc_flag_types(outfile, types):
-    _fwrite(outfile, """\
-        package altsrc
-
-        import "gopkg.in/urfave/cli.v2"
-
-        // WARNING: This file is generated!
-
-        """)
-
-    for typedef in types:
-        _set_typedef_defaults(typedef)
-
-        _fwrite(outfile, """\
-        // {name}Flag is the flag type that wraps cli.{name}Flag to allow
-        // for other values to be specified
-        type {name}Flag struct {{
-            *cli.{name}Flag
-            set *flag.FlagSet
-        }}
-
-        // New{name}Flag creates a new {name}Flag
-        func New{name}Flag(fl *cli.{name}Flag) *{name}Flag {{
-            return &{name}Flag{{{name}Flag: fl, set: nil}}
-        }}
-
-        // Apply saves the flagSet for later usage calls, then calls the
-        // wrapped {name}Flag.Apply
-        func (f *{name}Flag) Apply(set *flag.FlagSet) {{
-            f.set = set
-            f.{name}Flag.Apply(set)
-        }}
-
-        // ApplyWithError saves the flagSet for later usage calls, then calls the
-        // wrapped {name}Flag.ApplyWithError
-        func (f *{name}Flag) ApplyWithError(set *flag.FlagSet) error {{
-            f.set = set
-            return f.{name}Flag.ApplyWithError(set)
-        }}
-        """.format(**typedef))
-
-
-def _fwrite(outfile, text):
-    print(textwrap.dedent(text), end=None, file=outfile)
-
-
-_WRITEFUNCS = {
-    'cli': _write_cli_flag_types,
-    'altsrc': _write_altsrc_flag_types
-}
-
-if __name__ == '__main__':
-    sys.exit(main())
diff --git a/vendor/gopkg.in/urfave/cli.v2/help.go b/vendor/gopkg.in/urfave/cli.v2/help.go
deleted file mode 100644
index 02fcf330..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/help.go
+++ /dev/null
@@ -1,382 +0,0 @@
-package cli
-
-import (
-	"fmt"
-	"io"
-	"os"
-	"strings"
-	"text/tabwriter"
-	"text/template"
-)
-
-// AppHelpTemplate is the text template for the Default help topic.
-// cli.go uses text/template to render templates. You can
-// render custom help text by setting this variable.
-var AppHelpTemplate = `NAME:
-   {{.Name}}{{if .Usage}} - {{.Usage}}{{end}}
-
-USAGE:
-   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Version}}{{if not .HideVersion}}
-
-VERSION:
-   {{.Version}}{{end}}{{end}}{{if .Description}}
-
-DESCRIPTION:
-   {{.Description}}{{end}}{{if len .Authors}}
-
-AUTHOR{{with $length := len .Authors}}{{if ne 1 $length}}S{{end}}{{end}}:
-   {{range $index, $author := .Authors}}{{if $index}}
-   {{end}}{{$author}}{{end}}{{end}}{{if .VisibleCommands}}
-
-COMMANDS:{{range .VisibleCategories}}{{if .Name}}
-   {{.Name}}:{{end}}{{range .VisibleCommands}}
-     {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
-
-GLOBAL OPTIONS:
-   {{range $index, $option := .VisibleFlags}}{{if $index}}
-   {{end}}{{$option}}{{end}}{{end}}{{if .Copyright}}
-
-COPYRIGHT:
-   {{.Copyright}}{{end}}
-`
-
-// CommandHelpTemplate is the text template for the command help topic.
-// cli.go uses text/template to render templates. You can
-// render custom help text by setting this variable.
-var CommandHelpTemplate = `NAME:
-   {{.HelpName}} - {{.Usage}}
-
-USAGE:
-   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}}{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Category}}
-
-CATEGORY:
-   {{.Category}}{{end}}{{if .Description}}
-
-DESCRIPTION:
-   {{.Description}}{{end}}{{if .VisibleFlags}}
-
-OPTIONS:
-   {{range .VisibleFlags}}{{.}}
-   {{end}}{{end}}
-`
-
-// SubcommandHelpTemplate is the text template for the subcommand help topic.
-// cli.go uses text/template to render templates. You can
-// render custom help text by setting this variable.
-var SubcommandHelpTemplate = `NAME:
-   {{.HelpName}} - {{if .Description}}{{.Description}}{{else}}{{.Usage}}{{end}}
-
-USAGE:
-   {{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} command{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}
-
-COMMANDS:{{range .VisibleCategories}}{{if .Name}}
-   {{.Name}}:{{end}}{{range .VisibleCommands}}
-     {{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}
-{{end}}{{if .VisibleFlags}}
-OPTIONS:
-   {{range .VisibleFlags}}{{.}}
-   {{end}}{{end}}
-`
-
-var helpCommand = &Command{
-	Name:      "help",
-	Aliases:   []string{"h"},
-	Usage:     "Shows a list of commands or help for one command",
-	ArgsUsage: "[command]",
-	Action: func(c *Context) error {
-		args := c.Args()
-		if args.Present() {
-			return ShowCommandHelp(c, args.First())
-		}
-
-		ShowAppHelp(c)
-		return nil
-	},
-}
-
-var helpSubcommand = &Command{
-	Name:      "help",
-	Aliases:   []string{"h"},
-	Usage:     "Shows a list of commands or help for one command",
-	ArgsUsage: "[command]",
-	Action: func(c *Context) error {
-		args := c.Args()
-		if args.Present() {
-			return ShowCommandHelp(c, args.First())
-		}
-
-		return ShowSubcommandHelp(c)
-	},
-}
-
-// Prints help for the App or Command
-type helpPrinter func(w io.Writer, templ string, data interface{})
-
-// Prints help for the App or Command with custom template function.
-type helpPrinterCustom func(w io.Writer, templ string, data interface{}, customFunc map[string]interface{})
-
-// HelpPrinter is a function that writes the help output. If not set a default
-// is used. The function signature is:
-// func(w io.Writer, templ string, data interface{})
-var HelpPrinter helpPrinter = printHelp
-
-// HelpPrinterCustom is same as HelpPrinter but
-// takes a custom function for template function map.
-var HelpPrinterCustom helpPrinterCustom = printHelpCustom
-
-// VersionPrinter prints the version for the App
-var VersionPrinter = printVersion
-
-// ShowAppHelpAndExit - Prints the list of subcommands for the app and exits with exit code.
-func ShowAppHelpAndExit(c *Context, exitCode int) {
-	ShowAppHelp(c)
-	os.Exit(exitCode)
-}
-
-// ShowAppHelp is an action that displays the help.
-func ShowAppHelp(c *Context) (err error) {
-	if c.App.CustomAppHelpTemplate == "" {
-		HelpPrinter(c.App.Writer, AppHelpTemplate, c.App)
-		return
-	}
-	customAppData := func() map[string]interface{} {
-		if c.App.ExtraInfo == nil {
-			return nil
-		}
-		return map[string]interface{}{
-			"ExtraInfo": c.App.ExtraInfo,
-		}
-	}
-	HelpPrinterCustom(c.App.Writer, c.App.CustomAppHelpTemplate, c.App, customAppData())
-	return nil
-}
-
-// DefaultAppComplete prints the list of subcommands as the default app completion method
-func DefaultAppComplete(c *Context) {
-	for _, command := range c.App.Commands {
-		if command.Hidden {
-			continue
-		}
-		for _, name := range command.Names() {
-			fmt.Fprintln(c.App.Writer, name)
-		}
-	}
-}
-
-// ShowCommandHelpAndExit - exits with code after showing help
-func ShowCommandHelpAndExit(c *Context, command string, code int) {
-	ShowCommandHelp(c, command)
-	os.Exit(code)
-}
-
-// ShowCommandHelp prints help for the given command
-func ShowCommandHelp(ctx *Context, command string) error {
-	// show the subcommand help for a command with subcommands
-	if command == "" {
-		HelpPrinter(ctx.App.Writer, SubcommandHelpTemplate, ctx.App)
-		return nil
-	}
-
-	for _, c := range ctx.App.Commands {
-		if c.HasName(command) {
-			if c.CustomHelpTemplate != "" {
-				HelpPrinterCustom(ctx.App.Writer, c.CustomHelpTemplate, c, nil)
-			} else {
-				HelpPrinter(ctx.App.Writer, CommandHelpTemplate, c)
-			}
-			return nil
-		}
-	}
-
-	if ctx.App.CommandNotFound == nil {
-		return Exit(fmt.Sprintf("No help topic for '%v'", command), 3)
-	}
-
-	ctx.App.CommandNotFound(ctx, command)
-	return nil
-}
-
-// ShowSubcommandHelp prints help for the given subcommand
-func ShowSubcommandHelp(c *Context) error {
-	if c == nil {
-		return nil
-	}
-
-	if c.Command != nil {
-		return ShowCommandHelp(c, c.Command.Name)
-	}
-
-	return ShowCommandHelp(c, "")
-}
-
-// ShowVersion prints the version number of the App
-func ShowVersion(c *Context) {
-	VersionPrinter(c)
-}
-
-func printVersion(c *Context) {
-	fmt.Fprintf(c.App.Writer, "%v version %v\n", c.App.Name, c.App.Version)
-}
-
-// ShowCompletions prints the lists of commands within a given context
-func ShowCompletions(c *Context) {
-	a := c.App
-	if a != nil && a.ShellComplete != nil {
-		a.ShellComplete(c)
-	}
-}
-
-// ShowCommandCompletions prints the custom completions for a given command
-func ShowCommandCompletions(ctx *Context, command string) {
-	c := ctx.App.Command(command)
-	if c != nil && c.ShellComplete != nil {
-		c.ShellComplete(ctx)
-	}
-}
-
-func printHelpCustom(out io.Writer, templ string, data interface{}, customFunc map[string]interface{}) {
-	funcMap := template.FuncMap{
-		"join": strings.Join,
-	}
-	if customFunc != nil {
-		for key, value := range customFunc {
-			funcMap[key] = value
-		}
-	}
-
-	w := tabwriter.NewWriter(out, 1, 8, 2, ' ', 0)
-	t := template.Must(template.New("help").Funcs(funcMap).Parse(templ))
-
-	errDebug := os.Getenv("CLI_TEMPLATE_ERROR_DEBUG") != ""
-
-	err := t.Execute(w, data)
-	if err != nil {
-		if errDebug {
-			fmt.Fprintf(ErrWriter, "CLI TEMPLATE ERROR: %#v\n", err)
-		}
-		return
-	}
-
-	w.Flush()
-}
-
-func printHelp(out io.Writer, templ string, data interface{}) {
-	printHelpCustom(out, templ, data, nil)
-}
-
-func checkVersion(c *Context) bool {
-	found := false
-	for _, name := range VersionFlag.Names() {
-		if c.Bool(name) {
-			found = true
-		}
-	}
-	return found
-}
-
-func checkHelp(c *Context) bool {
-	found := false
-	for _, name := range HelpFlag.Names() {
-		if c.Bool(name) {
-			found = true
-		}
-	}
-	return found
-}
-
-func checkCommandHelp(c *Context, name string) bool {
-	if c.Bool("h") || c.Bool("help") {
-		ShowCommandHelp(c, name)
-		return true
-	}
-
-	return false
-}
-
-func checkSubcommandHelp(c *Context) bool {
-	if c.Bool("h") || c.Bool("help") {
-		ShowSubcommandHelp(c)
-		return true
-	}
-
-	return false
-}
-
-func checkShellCompleteFlag(a *App, arguments []string) (bool, []string) {
-	if !a.EnableShellCompletion {
-		return false, arguments
-	}
-
-	pos := len(arguments) - 1
-	lastArg := arguments[pos]
-
-	if lastArg != "--"+genCompName() {
-		return false, arguments
-	}
-
-	return true, arguments[:pos]
-}
-
-func checkCompletions(c *Context) bool {
-	if !c.shellComplete {
-		return false
-	}
-
-	if args := c.Args(); args.Present() {
-		name := args.First()
-		if cmd := c.App.Command(name); cmd != nil {
-			// let the command handle the completion
-			return false
-		}
-	}
-
-	ShowCompletions(c)
-	return true
-}
-
-func checkCommandCompletions(c *Context, name string) bool {
-	if !c.shellComplete {
-		return false
-	}
-
-	ShowCommandCompletions(c, name)
-	return true
-}
-
-func checkInitCompletion(c *Context) (bool, error) {
-	if c.IsSet(InitCompletionFlag.Name) {
-		shell := c.String(InitCompletionFlag.Name)
-		progName := os.Args[0]
-		switch shell {
-		case "bash":
-			fmt.Print(bashCompletionCode(progName))
-			return true, nil
-		case "zsh":
-			fmt.Print(zshCompletionCode(progName))
-			return true, nil
-		default:
-			return false, fmt.Errorf("--init-completion value cannot be '%s'", shell)
-		}
-	}
-	return false, nil
-}
-
-func bashCompletionCode(progName string) string {
-	var template = `_cli_bash_autocomplete() {
-     local cur opts base;
-     COMPREPLY=();
-     cur="${COMP_WORDS[COMP_CWORD]}";
-     opts=$( ${COMP_WORDS[@]:0:$COMP_CWORD} --%s );
-     COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) );
-     return 0;
-};
-complete -F _cli_bash_autocomplete %s`
-	return fmt.Sprintf(template, genCompName(), progName)
-}
-
-func zshCompletionCode(progName string) string {
-	var template = `autoload -U compinit && compinit;
-autoload -U bashcompinit && bashcompinit;`
-
-	return template + "\n" + bashCompletionCode(progName)
-}
diff --git a/vendor/gopkg.in/urfave/cli.v2/runtests b/vendor/gopkg.in/urfave/cli.v2/runtests
deleted file mode 100644
index d2c5ea6b..00000000
--- a/vendor/gopkg.in/urfave/cli.v2/runtests
+++ /dev/null
@@ -1,172 +0,0 @@
-#!/usr/bin/env python
-from __future__ import print_function, unicode_literals
-
-import argparse
-import codecs
-import glob
-import os
-import platform
-import shutil
-import sys
-import tempfile
-
-from subprocess import check_call, check_output
-
-
-_PY3 = sys.version_info.major == 3
-_WINDOWS = platform.system().lower() == 'windows'
-_PACKAGE_NAME = os.environ.get(
-    'CLI_PACKAGE_NAME', 'github.com/urfave/cli'
-)
-_TARGETS = {}
-
-
-def main(sysargs=sys.argv[:]):
-    parser = argparse.ArgumentParser()
-    parser.add_argument(
-        'target', nargs='?', choices=tuple(_TARGETS.keys()), default='test'
-    )
-    args = parser.parse_args(sysargs[1:])
-
-    _TARGETS[args.target]()
-    return 0
-
-
-def _target(func):
-    _TARGETS[func.__name__.strip('_')] = func
-    return func
-
-
-@_target
-def _test():
-    if _go_version() < 'go1.2':
-        _run('go test -v .')
-        return
-
-    coverprofiles = []
-    for subpackage in ['', 'altsrc']:
-        coverprofile = 'cli.coverprofile'
-        if subpackage != '':
-            coverprofile = '{}.coverprofile'.format(subpackage)
-
-        coverprofiles.append(coverprofile)
-
-        _run('go test -v'.split() + [
-            '-coverprofile={}'.format(coverprofile),
-            ('{}/{}'.format(_PACKAGE_NAME, subpackage)).rstrip('/')
-        ])
-
-    combined_name = _combine_coverprofiles(coverprofiles)
-    _run('go tool cover -func={}'.format(combined_name))
-    os.remove(combined_name)
-
-
-@_target
-def _gfmrun():
-    go_version = _go_version()
-    if go_version < 'go1.3':
-        print('runtests: skip on {}'.format(go_version), file=sys.stderr)
-        return
-    _run(['gfmrun', '-c', str(_gfmrun_count()), '-s', 'README.md'])
-
-
-@_target
-def _vet():
-    _run('go vet ./...')
-
-
-@_target
-def _migrations():
-    go_version = _go_version()
-    if go_version < 'go1.3':
-        print('runtests: skip on {}'.format(go_version), file=sys.stderr)
-        return
-
-    migration_script = os.path.abspath(
-        os.environ.get('V1TOV2', './cli-v1-to-v2')
-    )
-    v1_readme_url = os.environ.get(
-        'V1README',
-        'https://raw.githubusercontent.com/urfave/cli/v1/README.md'
-    )
-
-    tmpdir = tempfile.mkdtemp()
-    try:
-        os.chdir(tmpdir)
-        _run('curl -sSL -o README.md {}'.format(v1_readme_url).split())
-        _run('gfmrun extract -o .'.split())
-
-        for gofile in glob.glob('*.go'):
-            for i in (0, 1):
-                _run(['python', migration_script, '-w', gofile])
-                _run('go build -o tmp.out {}'.format(gofile).split())
-    finally:
-        if os.environ.get('NOCLEAN', '') == '':
-            shutil.rmtree(tmpdir, ignore_errors=True)
-
-
-@_target
-def _toc():
-    exe = ['bash'] if _WINDOWS else []
-    _run(exe + [
-        os.path.join('node_modules', '.bin', 'markdown-toc'),
-        '-i', 'README.md'
-    ])
-    _run('git diff --exit-code')
-
-
-@_target
-def _gen():
-    go_version = _go_version()
-    if go_version < 'go1.5':
-        print('runtests: skip on {}'.format(go_version), file=sys.stderr)
-        return
-
-    _run('go generate ./...')
-    _run('git diff --exit-code')
-
-
-def _run(command):
-    if hasattr(command, 'split'):
-        command = command.split()
-    print('runtests: {}'.format(' '.join(command)), file=sys.stderr)
-    sys.stderr.flush()
-    check_call(command)
-
-
-def _gfmrun_count():
-    with codecs.open('README.md', 'r', 'utf-8') as infile:
-        lines = infile.read().splitlines()
-        return len(list(filter(_is_go_runnable, lines)))
-
-
-def _is_go_runnable(line):
-    return line.startswith('package main')
-
-
-def _go_version():
-    return check_output('go version'.split()).decode('utf-8').split()[2]
-
-
-def _combine_coverprofiles(coverprofiles):
-    tmp_args = dict(suffix='.coverprofile', mode='w', delete=False)
-    if _PY3:
-        tmp_args['encoding'] = 'utf-8'
-
-    combined = tempfile.NamedTemporaryFile(**tmp_args)
-    combined.write('mode: set\n')
-
-    for coverprofile in coverprofiles:
-        with codecs.open(coverprofile, 'r', 'utf-8') as infile:
-            for line in infile.readlines():
-                if not line.startswith('mode: '):
-                    combined.write(line)
-
-    combined.flush()
-    name = combined.name
-    combined.close()
-    return name
-
-
-if __name__ == '__main__':
-    sys.exit(main())
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 8233dea8..978e335f 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -89,6 +89,8 @@ github.com/coredns/coredns/request
 github.com/coreos/go-oidc/jose
 # github.com/coreos/go-systemd v0.0.0-20190620071333-e64a0ec8b42a
 github.com/coreos/go-systemd/daemon
+# github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d
+github.com/cpuguy83/go-md2man/v2/md2man
 # github.com/davecgh/go-spew v1.1.1
 github.com/davecgh/go-spew/spew
 # github.com/denisenkom/go-mssqldb v0.0.0-20191001013358-cfbb681360f0
@@ -189,9 +191,16 @@ github.com/prometheus/common/model
 github.com/prometheus/procfs
 github.com/prometheus/procfs/internal/fs
 github.com/prometheus/procfs/internal/util
+# github.com/russross/blackfriday/v2 v2.0.1
+github.com/russross/blackfriday/v2
+# github.com/shurcooL/sanitized_anchor_name v1.0.0
+github.com/shurcooL/sanitized_anchor_name
 # github.com/stretchr/testify v1.3.0
 github.com/stretchr/testify/assert
 github.com/stretchr/testify/require
+# github.com/urfave/cli/v2 v2.2.0
+github.com/urfave/cli/v2
+github.com/urfave/cli/v2/altsrc
 # github.com/xo/dburl v0.0.0-20191005012637-293c3298d6c0
 github.com/xo/dburl
 # golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
@@ -298,9 +307,6 @@ gopkg.in/coreos/go-oidc.v2
 gopkg.in/square/go-jose.v2
 gopkg.in/square/go-jose.v2/cipher
 gopkg.in/square/go-jose.v2/json
-# gopkg.in/urfave/cli.v2 v2.0.0-20180128181224-d604b6ffeee8
-gopkg.in/urfave/cli.v2
-gopkg.in/urfave/cli.v2/altsrc
 # gopkg.in/yaml.v2 v2.2.4
 gopkg.in/yaml.v2
 # zombiezen.com/go/capnproto2 v2.18.0+incompatible