369 lines
9.2 KiB
Bash
369 lines
9.2 KiB
Bash
|
#!/bin/bash
|
||
|
|
|
||
|
|
<<LICENSE
|
||
|
|
MIT License
|
||
|
|
|
||
|
|
Copyright (c) 2016 Chad Braun-Duin
|
||
|
|
|
||
|
|
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.
|
||
|
|
LICENSE
|
||
|
|
|
||
|
|
# uncomment the following two lines if you have both BSD sed and GNU sed installed
|
||
|
|
# this script is only tested to work with GNU sed which may have the command gsed
|
||
|
|
# shopt -s expand_aliases
|
||
|
|
# alias sed=gsed
|
||
|
|
|
||
|
|
# move the original text to a temp file that can be progressively modified
|
||
|
|
temp_file="/tmp/markdown.$$"
|
||
|
|
cat "$@" > "$temp_file"
|
||
|
|
|
||
|
|
# All of this below business is for reference-style links and images
|
||
|
|
# We need to loop across newlines and not spaces
|
||
|
|
IFS='
|
||
|
|
'
|
||
|
|
refs=$(sed -nr "/^\[.+\]: +/p" "$@")
|
||
|
|
for ref in $refs
|
||
|
|
do
|
||
|
|
ref_id=$(echo -n "$ref" | sed -nr "s/^\[(.+)\]: .*/\1/p" | tr -d '\n')
|
||
|
|
ref_url=$(echo -n "$ref" | sed -nr "s/^\[.+\]: (.+)/\1/p" | cut -d' ' -f1 | tr -d '\n')
|
||
|
|
ref_title=$(echo -n "$ref" | sed -nr "s/^\[.+\]: (.+) \"(.+)\"/\2/p" | sed 's@|@!@g' | tr -d '\n')
|
||
|
|
|
||
|
|
# reference-style image using the label
|
||
|
|
sed -ri "s|!\[([^]]+)\]\[($ref_id)\]|<img src=\"$ref_url\" title=\"$ref_title\" alt=\"\1\" />|gI" "$temp_file"
|
||
|
|
# reference-style link using the label
|
||
|
|
sed -ri "s|\[([^]]+)\]\[($ref_id)\]|<a href=\"$ref_url\" title=\"$ref_title\">\1</a>|gI" "$temp_file"
|
||
|
|
|
||
|
|
# implicit reference-style
|
||
|
|
sed -ri "s|!\[($ref_id)\]\[\]|<img src=\"$ref_url\" title=\"$ref_title\" alt=\"\1\" />|gI" "$temp_file"
|
||
|
|
# implicit reference-style
|
||
|
|
sed -ri "s|\[($ref_id)\]\[\]|<a href=\"$ref_url\" title=\"$ref_title\">\1</a>|gI" "$temp_file"
|
||
|
|
done
|
||
|
|
|
||
|
|
# delete the reference lines
|
||
|
|
sed -ri "/^\[.+\]: +/d" "$temp_file"
|
||
|
|
|
||
|
|
# blockquotes
|
||
|
|
# use grep to find all the nested blockquotes
|
||
|
|
while grep '^> ' "$temp_file" >/dev/null
|
||
|
|
do
|
||
|
|
sed -nri '
|
||
|
|
/^$/b blockquote
|
||
|
|
|
||
|
|
H
|
||
|
|
$ b blockquote
|
||
|
|
b
|
||
|
|
|
||
|
|
:blockquote
|
||
|
|
x
|
||
|
|
s/(\n+)(> .*)/\1<blockquote>\n\2\n<\/blockquote>/ # wrap the tags in a blockquote
|
||
|
|
p
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
sed -i '1 d' "$temp_file" # cleanup superfluous first line
|
||
|
|
|
||
|
|
# cleanup blank lines and remove subsequent blockquote characters
|
||
|
|
sed -ri '
|
||
|
|
/^> /s/^> (.*)/\1/
|
||
|
|
' "$temp_file"
|
||
|
|
done
|
||
|
|
|
||
|
|
# Setext-style headers
|
||
|
|
sed -nri '
|
||
|
|
# Setext-style headers need to be wrapped around newlines
|
||
|
|
/^$/ b print
|
||
|
|
|
||
|
|
# else, append to holding area
|
||
|
|
H
|
||
|
|
$ b print
|
||
|
|
b
|
||
|
|
|
||
|
|
:print
|
||
|
|
x
|
||
|
|
/=+$/{
|
||
|
|
s/\n(.*)\n=+$/\n<h1>\1<\/h1>/
|
||
|
|
p
|
||
|
|
b
|
||
|
|
}
|
||
|
|
/\-+$/{
|
||
|
|
s/\n(.*)\n\-+$/\n<h2>\1<\/h2>/
|
||
|
|
p
|
||
|
|
b
|
||
|
|
}
|
||
|
|
p
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
sed -i '1 d' "$temp_file" # cleanup superfluous first line
|
||
|
|
|
||
|
|
# atx-style headers and other block styles
|
||
|
|
sed -ri '
|
||
|
|
/^#+ /s/ #+$// # kill all ending header characters
|
||
|
|
/^# /s/# ([A-Za-z0-9 ]*)(.*)/<h1 id="\1">\1\2<\/h1>/g # H1
|
||
|
|
/^#{2} /s/#{2} ([A-Za-z0-9 ]*)(.*)/<h2 id="\1">\1\2<\/h2>/g # H2
|
||
|
|
/^#{3} /s/#{3} ([A-Za-z0-9 ]*)(.*)/<h3 id="\1">\1\2<\/h3>/g # H3
|
||
|
|
/^#{4} /s/#{4} ([A-Za-z0-9 ]*)(.*)/<h4 id="\1">\1\2<\/h4>/g # H4
|
||
|
|
/^#{5} /s/#{5} ([A-Za-z0-9 ]*)(.*)/<h5 id="\1">\1\2<\/h5>/g # H5
|
||
|
|
/^#{6} /s/#{6} ([A-Za-z0-9 ]*)(.*)/<h6 id="\1">\1\2<\/h6>/g # H6
|
||
|
|
|
||
|
|
/^\*\*\*+$/s/\*\*\*+/<hr \/>/ # hr with *
|
||
|
|
/^---+$/s/---+/<hr \/>/ # hr with -
|
||
|
|
/^___+$/s/___+/<hr \/>/ # hr with _
|
||
|
|
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
# unordered lists
|
||
|
|
# use grep to find all the nested lists
|
||
|
|
while grep '^[\*\+\-] ' "$temp_file" >/dev/null
|
||
|
|
do
|
||
|
|
sed -nri '
|
||
|
|
# wrap the list
|
||
|
|
/^$/b list
|
||
|
|
|
||
|
|
# wrap the li tags then add to the hold buffer
|
||
|
|
# use uli instead of li to avoid collisions when processing nested lists
|
||
|
|
/^[\*\+\-] /s/[\*\+\-] (.*)/<\/uli>\n<uli>\n\1/
|
||
|
|
|
||
|
|
H
|
||
|
|
$ b list # if at end of file, check for the end of a list
|
||
|
|
b # else, branch to the end of the script
|
||
|
|
|
||
|
|
# this is where a list is checked for the pattern
|
||
|
|
:list
|
||
|
|
# exchange the hold space into the pattern space
|
||
|
|
x
|
||
|
|
# look for the list items, if there wrap the ul tags
|
||
|
|
/<uli>/{
|
||
|
|
s/(.*)/\n<ul>\1\n<\/uli>\n<\/ul>/ # close the ul tags
|
||
|
|
s/\n<\/uli>// # kill the first superfluous closing tag
|
||
|
|
p
|
||
|
|
b
|
||
|
|
}
|
||
|
|
p
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
sed -i '1 d' "$temp_file" # cleanup superfluous first line
|
||
|
|
|
||
|
|
# convert to the proper li to avoid collisions with nested lists
|
||
|
|
sed -i 's/uli>/li>/g' "$temp_file"
|
||
|
|
|
||
|
|
# prepare any nested lists
|
||
|
|
sed -ri '/^[\*\+\-] /s/(.*)/\n\1\n/' "$temp_file"
|
||
|
|
done
|
||
|
|
|
||
|
|
# ordered lists
|
||
|
|
# use grep to find all the nested lists
|
||
|
|
while grep -E '^[1-9]+\. ' "$temp_file" >/dev/null
|
||
|
|
do
|
||
|
|
sed -nri '
|
||
|
|
# wrap the list
|
||
|
|
/^$/b list
|
||
|
|
|
||
|
|
# wrap the li tags then add to the hold buffer
|
||
|
|
# use oli instead of li to avoid collisions when processing nested lists
|
||
|
|
/^[1-9]+\. /s/[1-9]+\. (.*)/<\/oli>\n<oli>\n\1/
|
||
|
|
|
||
|
|
H
|
||
|
|
$ b list # if at end of file, check for the end of a list
|
||
|
|
b # else, branch to the end of the script
|
||
|
|
|
||
|
|
:list
|
||
|
|
# exchange the hold space into the pattern space
|
||
|
|
x
|
||
|
|
# look for the list items, if there wrap the ol tags
|
||
|
|
/<oli>/{
|
||
|
|
s/(.*)/\n<ol>\1\n<\/oli>\n<\/ol>/ # close the ol tags
|
||
|
|
s/\n<\/oli>// # kill the first superfluous closing tag
|
||
|
|
p
|
||
|
|
b
|
||
|
|
}
|
||
|
|
p
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
sed -i '1 d' "$temp_file" # cleanup superfluous first line
|
||
|
|
|
||
|
|
# convert list items into proper list items to avoid collisions with nested lists
|
||
|
|
sed -i 's/oli>/li>/g' "$temp_file"
|
||
|
|
|
||
|
|
# prepare any nested lists
|
||
|
|
sed -ri '/^[1-9]+\. /s/(.*)/\n\1\n/' "$temp_file"
|
||
|
|
done
|
||
|
|
|
||
|
|
# make escaped periods literal
|
||
|
|
sed -ri '/^[1-9]+\\. /s/([1-9]+)\\. /\1\. /' "$temp_file"
|
||
|
|
|
||
|
|
|
||
|
|
# code blocks
|
||
|
|
sed -nri '
|
||
|
|
# if at end of file, append the current line to the hold buffer and print it
|
||
|
|
${
|
||
|
|
H
|
||
|
|
b code
|
||
|
|
}
|
||
|
|
|
||
|
|
# wrap the code block on any non code block lines
|
||
|
|
/^\t| {4}/!b code
|
||
|
|
|
||
|
|
# else, append to the holding buffer and do nothing
|
||
|
|
H
|
||
|
|
b # else, branch to the end of the script
|
||
|
|
|
||
|
|
:code
|
||
|
|
# exchange the hold space with the pattern space
|
||
|
|
x
|
||
|
|
# look for the code items, if there wrap the pre-code tags
|
||
|
|
/\t| {4}/{
|
||
|
|
s/(\t| {4})(.*)/<pre><code>\n\1\2\n<\/code><\/pre>/ # wrap the ending tags
|
||
|
|
p
|
||
|
|
b
|
||
|
|
}
|
||
|
|
p
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
sed -i '1 d' "$temp_file" # cleanup superfluous first line
|
||
|
|
|
||
|
|
# convert html characters inside pre-code tags into printable representations
|
||
|
|
sed -ri '
|
||
|
|
# get inside pre-code tags
|
||
|
|
/^<pre><code>/{
|
||
|
|
:inside
|
||
|
|
n
|
||
|
|
# if you found the end tags, branch out
|
||
|
|
/^<\/code><\/pre>/!{
|
||
|
|
s/&/\&/g # ampersand
|
||
|
|
s/</\</g # less than
|
||
|
|
s/>/\>/g # greater than
|
||
|
|
b inside
|
||
|
|
}
|
||
|
|
}
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
# remove the first tab (or 4 spaces) from the code lines
|
||
|
|
sed -ri 's/^\t| {4}(.*)/\1/' "$temp_file"
|
||
|
|
|
||
|
|
# br tags
|
||
|
|
sed -ri '
|
||
|
|
# if an empty line, append it to the next line, then check on whether there is two in a row
|
||
|
|
/^$/ {
|
||
|
|
N
|
||
|
|
N
|
||
|
|
/^\n{2}/s/(.*)/\n<br \/>\1/
|
||
|
|
}
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
# emphasis and strong emphasis and strikethrough
|
||
|
|
sed -nri '
|
||
|
|
# batch up the entire stream of text until a line break in the action
|
||
|
|
/^$/b emphasis
|
||
|
|
|
||
|
|
H
|
||
|
|
$ b emphasis
|
||
|
|
b
|
||
|
|
|
||
|
|
:emphasis
|
||
|
|
x
|
||
|
|
s/\*\*(.+)\*\*/<strong>\1<\/strong>/g
|
||
|
|
s/__([^_]+)__/<strong>\1<\/strong>/g
|
||
|
|
s/\*([^\*]+)\*/<em>\1<\/em>/g
|
||
|
|
s/([^\\])_([^_]+)_/\1<em>\2<\/em>/g
|
||
|
|
s/\~\~(.+)\~\~/<strike>\1<\/strike>/g
|
||
|
|
p
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
sed -i '1 d' "$temp_file" # cleanup superfluous first line
|
||
|
|
|
||
|
|
# paragraphs
|
||
|
|
sed -nri '
|
||
|
|
# if an empty line, check the paragraph
|
||
|
|
/^$/ b para
|
||
|
|
# else append it to the hold buffer
|
||
|
|
H
|
||
|
|
# at end of file, check paragraph
|
||
|
|
$ b para
|
||
|
|
# now branch to end of script
|
||
|
|
b
|
||
|
|
# this is where a paragraph is checked for the pattern
|
||
|
|
:para
|
||
|
|
# return the entire paragraph into the pattern space
|
||
|
|
x
|
||
|
|
# look for non block-level elements, if there - print the p tags
|
||
|
|
/\n<(div|table|pre|p|[ou]l|h[1-6]|[bh]r|blockquote|li)/!{
|
||
|
|
s/(\n+)(.*)/\1<p>\n\2\n<\/p>/
|
||
|
|
p
|
||
|
|
b
|
||
|
|
}
|
||
|
|
p
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
sed -i '1 d' "$temp_file" # cleanup superfluous first line
|
||
|
|
|
||
|
|
# cleanup area where P tags have broken nesting
|
||
|
|
sed -nri '
|
||
|
|
# if the line looks like like an end tag
|
||
|
|
/^<\/(div|table|pre|p|[ou]l|h[1-6]|[bh]r|blockquote)>/{
|
||
|
|
h
|
||
|
|
# if EOF, print the line
|
||
|
|
$ {
|
||
|
|
x
|
||
|
|
b done
|
||
|
|
}
|
||
|
|
# fetch the next line and check on whether or not it is a P tag
|
||
|
|
n
|
||
|
|
/^<\/p>/{
|
||
|
|
G
|
||
|
|
b done
|
||
|
|
}
|
||
|
|
# else, append the line to the previous line and print them both
|
||
|
|
H
|
||
|
|
x
|
||
|
|
}
|
||
|
|
:done
|
||
|
|
p
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
# inline styles and special characters
|
||
|
|
sed -ri '
|
||
|
|
s/<(http[s]?:\/\/.*)>/<a href=\"\1\">\1<\/a>/g # automatic links
|
||
|
|
s/<(.*@.*\..*)>/<a href=\"mailto:\1\">\1<\/a>/g # automatic email address links
|
||
|
|
|
||
|
|
# inline code
|
||
|
|
s/([^\\])``+ *([^ ]*) *``+/\1<code>\2<\/code>/g
|
||
|
|
s/([^\\])`([^`]*)`/\1<code>\2<\/code>/g
|
||
|
|
|
||
|
|
s/!\[(.*)\]\((.*) \"(.*)\"\)/<img alt=\"\1\" src=\"\2\" title=\"\3\" \/>/g # inline image with title
|
||
|
|
s/!\[(.*)\]\((.*)\)/<img alt=\"\1\" src=\"\2\" \/>/g # inline image without title
|
||
|
|
|
||
|
|
s/\[(.*)]\((.*) "(.*)"\)/<a href=\"\2\" title=\"\3\">\1<\/a>/g # inline link with title
|
||
|
|
s/\[(.*)]\((.*)\)/<a href=\"\2\">\1<\/a>/g # inline link
|
||
|
|
|
||
|
|
# special characters
|
||
|
|
/&.+;/!s/&/\&/g # ampersand
|
||
|
|
/<[\/a-zA-Z]/!s/</\</g# less than bracket
|
||
|
|
|
||
|
|
# backslash escapes for literal characters
|
||
|
|
s/\\\*/\*/g # asterisk
|
||
|
|
s/\\_/_/g # underscore
|
||
|
|
s/\\`/`/g # underscore
|
||
|
|
s/\\#/#/g # pound or hash
|
||
|
|
s/\\\+/\+/g # plus
|
||
|
|
s/\\\-/\-/g # minus
|
||
|
|
s/\\\\/\\/g # backslash
|
||
|
|
' "$temp_file"
|
||
|
|
|
||
|
|
# display and cleanup
|
||
|
|
cat "$temp_file" && rm "$temp_file"
|