merge

.github/workflows/freebsd.yml

@@ -13,6 +13,7 @@ jobs:
     - name: Test in FreeBSD VM
       uses: vmactions/freebsd-vm@v0.1.5 # aka FreeBSD 13.0
       with:
+        mem: 2048
         usesh: true
         prepare: |
           export CPPFLAGS=-isystem/usr/local/include LDFLAGS=-L/usr/local/lib # sndio

README.md

@@ -2,7 +2,7 @@
 
 > Highly customizable Wayland bar for Sway and Wlroots based compositors.<br>
 > Available in Arch [community](https://www.archlinux.org/packages/community/x86_64/waybar/) or
-[AUR](https://aur.archlinux.org/packages/waybar-git/), [openSUSE](https://build.opensuse.org/package/show/X11:Wayland/waybar), and [Alpine Linux](https://pkgs.alpinelinux.org/packages?name=waybar)<br>
+[AUR](https://aur.archlinux.org/packages/waybar-git/), [Gentoo](https://packages.gentoo.org/packages/gui-apps/waybar), [openSUSE](https://build.opensuse.org/package/show/X11:Wayland/waybar), and [Alpine Linux](https://pkgs.alpinelinux.org/packages?name=waybar)<br>
 > *Waybar [examples](https://github.com/Alexays/Waybar/wiki/Examples)*
 
 #### Current features

include/bar.hpp

@@ -8,6 +8,9 @@
 #include <gtkmm/window.h>
 #include <json/json.h>
 
+#include <memory>
+#include <vector>
+
 #include "AModule.hpp"
 #include "xdg-output-unstable-v1-client-protocol.h"
 
@@ -36,6 +39,19 @@ struct bar_margins {
   int left = 0;
 };
 
+struct bar_mode {
+  bar_layer layer;
+  bool      exclusive;
+  bool      passthrough;
+  bool      visible;
+};
+
+#ifdef HAVE_SWAY
+namespace modules::sway {
+class BarIpcClient;
+}
+#endif  // HAVE_SWAY
+
 class BarSurface {
  protected:
   BarSurface() = default;
@@ -54,38 +70,56 @@ class BarSurface {
 
 class Bar {
  public:
+  using bar_mode_map = std::map<std::string_view, struct bar_mode>;
+  static const bar_mode_map     PRESET_MODES;
+  static const std::string_view MODE_DEFAULT;
+  static const std::string_view MODE_INVISIBLE;
+
   Bar(struct waybar_output *w_output, const Json::Value &);
   Bar(const Bar &) = delete;
-  ~Bar() = default;
+  ~Bar();
 
+  void setMode(const std::string_view &);
   void setVisible(bool visible);
   void toggle();
   void handleSignal(int);
 
   struct waybar_output *output;
   Json::Value           config;
-  struct wl_surface *   surface;
+  struct wl_surface    *surface;
-  bool                  exclusive = true;
   bool                  visible = true;
   bool                  vertical = false;
   Gtk::Window           window;
 
+#ifdef HAVE_SWAY
+  std::string bar_id;
+#endif
+
  private:
   void onMap(GdkEventAny *);
   auto setupWidgets() -> void;
-  void getModules(const Factory &, const std::string &);
+  void getModules(const Factory &, const std::string &, Gtk::Box*);
   void setupAltFormatKeyForModule(const std::string &module_name);
   void setupAltFormatKeyForModuleList(const char *module_list_name);
+  void setMode(const bar_mode &);
+
+  /* Copy initial set of modes to allow customization */
+  bar_mode_map configured_modes = PRESET_MODES;
+  std::string  last_mode_{MODE_DEFAULT};
 
   std::unique_ptr<BarSurface>                   surface_impl_;
-  bar_layer                                     layer_;
   Gtk::Box                                      left_;
   Gtk::Box                                      center_;
   Gtk::Box                                      right_;
   Gtk::Box                                      box_;
-  std::vector<std::unique_ptr<waybar::AModule>> modules_left_;
+  std::vector<std::shared_ptr<waybar::AModule>> modules_left_;
-  std::vector<std::unique_ptr<waybar::AModule>> modules_center_;
+  std::vector<std::shared_ptr<waybar::AModule>> modules_center_;
-  std::vector<std::unique_ptr<waybar::AModule>> modules_right_;
+  std::vector<std::shared_ptr<waybar::AModule>> modules_right_;
+#ifdef HAVE_SWAY
+  using BarIpcClient = modules::sway::BarIpcClient;
+  std::unique_ptr<BarIpcClient> _ipc_client;
+#endif
+  std::vector<std::shared_ptr<waybar::AModule>> modules_all_;
 };
 
 }  // namespace waybar

include/client.hpp

@@ -29,6 +29,7 @@ class Client {
   struct zwp_idle_inhibit_manager_v1 *idle_inhibit_manager = nullptr;
   std::vector<std::unique_ptr<Bar>>   bars;
   Config                              config;
+  std::string                         bar_id;
 
  private:
   Client() = default;

include/factory.hpp

@@ -51,6 +51,9 @@
 #ifdef HAVE_LIBSNDIO
 #include "modules/sndio.hpp"
 #endif
+#ifdef HAVE_GIO_UNIX
+#include "modules/inhibitor.hpp"
+#endif
 #include "bar.hpp"
 #include "modules/custom.hpp"
 #include "modules/temperature.hpp"

include/group.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <gtkmm/widget.h>
+#include <gtkmm/box.h>
+#include <json/json.h>
+#include "AModule.hpp"
+#include "bar.hpp"
+#include "factory.hpp"
+
+namespace waybar {
+
+class Group : public AModule {
+ public:
+  Group(const std::string&, const Bar&, const Json::Value&);
+  ~Group() = default;
+  auto update() -> void;
+  operator Gtk::Widget &();
+  Gtk::Box box;
+};
+
+}  // namespace waybar

include/modules/clock.hpp

@@ -17,6 +17,8 @@ struct waybar_time {
   date::zoned_seconds ztime;
 };
 
+const std::string kCalendarPlaceholder = "calendar";
+
 class Clock : public ALabel {
  public:
   Clock(const std::string&, const Json::Value&);
@@ -26,18 +28,19 @@ class Clock : public ALabel {
  private:
   util::SleeperThread thread_;
   std::locale locale_;
-  const date::time_zone* time_zone_;
+  std::vector<const date::time_zone*> time_zones_;
-  bool fixed_time_zone_;
+  int current_time_zone_idx_;
-  int time_zone_idx_;
   date::year_month_day cached_calendar_ymd_ = date::January/1/0;
   std::string cached_calendar_text_;
+  bool is_calendar_in_tooltip_;
 
   bool handleScroll(GdkEventScroll* e);
 
   auto calendar_text(const waybar_time& wtime) -> std::string;
   auto weekdays_header(const date::weekday& first_dow, std::ostream& os) -> void;
   auto first_day_of_week() -> date::weekday;
-  bool setTimeZone(Json::Value zone_name);
+  const date::time_zone* current_timezone();
+  bool is_timezone_fixed();
 };
 
 }  // namespace waybar::modules

include/modules/inhibitor.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <memory>
+
+#include <gio/gio.h>
+
+#include "ALabel.hpp"
+#include "bar.hpp"
+
+namespace waybar::modules {
+
+class Inhibitor : public ALabel {
+ public:
+  Inhibitor(const std::string&, const waybar::Bar&, const Json::Value&);
+  ~Inhibitor() override;
+  auto update() -> void;
+  auto activated() -> bool;
+
+ private:
+  auto handleToggle(::GdkEventButton* const& e) -> bool;
+
+  const std::unique_ptr<::GDBusConnection, void(*)(::GDBusConnection*)> dbus_;
+  const std::string inhibitors_;
+  int handle_ = -1;
+};
+
+} // namespace waybar::modules

include/modules/sway/bar.hpp

@@ -0,0 +1,49 @@
+#pragma once
+#include <string>
+
+#include "modules/sway/ipc/client.hpp"
+#include "util/SafeSignal.hpp"
+#include "util/json.hpp"
+
+namespace waybar {
+
+class Bar;
+
+namespace modules::sway {
+
+/*
+ * Supported subset of i3/sway IPC barconfig object
+ */
+struct swaybar_config {
+  std::string id;
+  std::string mode;
+  std::string hidden_state;
+};
+
+/**
+ * swaybar IPC client
+ */
+class BarIpcClient {
+ public:
+  BarIpcClient(waybar::Bar& bar);
+
+ private:
+  void onInitialConfig(const struct Ipc::ipc_response& res);
+  void onIpcEvent(const struct Ipc::ipc_response&);
+  void onConfigUpdate(const swaybar_config& config);
+  void onVisibilityUpdate(bool visible_by_modifier);
+  void update();
+
+  Bar&             bar_;
+  util::JsonParser parser_;
+  Ipc              ipc_;
+
+  swaybar_config bar_config_;
+  bool           visible_by_modifier_ = false;
+
+  SafeSignal<bool>           signal_visible_;
+  SafeSignal<swaybar_config> signal_config_;
+};
+
+}  // namespace modules::sway
+}  // namespace waybar

include/modules/sway/language.hpp

@@ -32,6 +32,7 @@ class Language : public ALabel, public sigc::trackable {
     std::string short_name;
     std::string variant;
     std::string short_description;
+    std::string country_flag() const;
   };
 
   class XKBContext {

include/util/SafeSignal.hpp

@@ -0,0 +1,75 @@
+#pragma once
+
+#include <glibmm/dispatcher.h>
+#include <sigc++/signal.h>
+
+#include <functional>
+#include <mutex>
+#include <queue>
+#include <thread>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+namespace waybar {
+
+/**
+ * Thread-safe signal wrapper.
+ * Uses Glib::Dispatcher to pass events to another thread and locked queue to pass the arguments.
+ */
+template <typename... Args>
+struct SafeSignal : sigc::signal<void(std::decay_t<Args>...)> {
+ public:
+  SafeSignal() { dp_.connect(sigc::mem_fun(*this, &SafeSignal::handle_event)); }
+
+  template <typename... EmitArgs>
+  void emit(EmitArgs&&... args) {
+    if (main_tid_ == std::this_thread::get_id()) {
+      /*
+       * Bypass the queue if the method is called the main thread.
+       * Ensures that events emitted from the main thread are processed synchronously and saves a
+       * few CPU cycles on locking/queuing.
+       * As a downside, this makes main thread events prioritized over the other threads and
+       * disrupts chronological order.
+       */
+      signal_t::emit(std::forward<EmitArgs>(args)...);
+    } else {
+      {
+        std::unique_lock lock(mutex_);
+        queue_.emplace(std::forward<EmitArgs>(args)...);
+      }
+      dp_.emit();
+    }
+  }
+
+  template <typename... EmitArgs>
+  inline void operator()(EmitArgs&&... args) {
+    emit(std::forward<EmitArgs>(args)...);
+  }
+
+ protected:
+  using signal_t = sigc::signal<void(std::decay_t<Args>...)>;
+  using slot_t = decltype(std::declval<signal_t>().make_slot());
+  using arg_tuple_t = std::tuple<std::decay_t<Args>...>;
+  // ensure that unwrapped methods are not accessible
+  using signal_t::emit_reverse;
+  using signal_t::make_slot;
+
+  void handle_event() {
+    for (std::unique_lock lock(mutex_); !queue_.empty(); lock.lock()) {
+      auto args = queue_.front();
+      queue_.pop();
+      lock.unlock();
+      std::apply(cached_fn_, args);
+    }
+  }
+
+  Glib::Dispatcher        dp_;
+  std::mutex              mutex_;
+  std::queue<arg_tuple_t> queue_;
+  const std::thread::id   main_tid_ = std::this_thread::get_id();
+  // cache functor for signal emission to avoid recreating it on each event
+  const slot_t cached_fn_ = make_slot();
+};
+
+}  // namespace waybar

man/waybar-inhibitor.5.scd

@@ -0,0 +1,92 @@
+waybar-inhibitor(5)
+
+# NAME
+
+waybar - inhibitor module
+
+# DESCRIPTION
+
+The *inhibitor* module allows to take an inhibitor lock that logind provides.
+See *systemd-inhibit*(1) for more information.
+
+# CONFIGURATION
+
+*what*: ++
+	typeof: string or array ++
+	The inhibitor lock or locks that should be taken when active. The available inhibitor locks are *idle*, *shutdown*, *sleep*, *handle-power-key*, *handle-suspend-key*, *handle-hibernate-key* and *handle-lid-switch*.
+
+*format*: ++
+	typeof: string ++
+	The format, how the state should be displayed.
+
+*format-icons*: ++
+	typeof: array ++
+	Based on the current state, the corresponding icon gets selected.
+
+*rotate*: ++
+	typeof: integer ++
+	Positive value to rotate the text label.
+
+*max-length*: ++
+	typeof: integer ++
+	The maximum length in character the module should display.
+
+*min-length*: ++
+	typeof: integer ++
+	The minimum length in characters the module should take up.
+
+*align*: ++
+	typeof: float ++
+	The alignment of the text, where 0 is left-aligned and 1 is right-aligned. If the module is rotated, it will follow the flow of the text.
+
+*on-click*: ++
+	typeof: string ++
+	Command to execute when clicked on the module. A click also toggles the state
+
+*on-click-middle*: ++
+	typeof: string ++
+	Command to execute when middle-clicked on the module using mousewheel.
+
+*on-click-right*: ++
+	typeof: string ++
+	Command to execute when you right clicked on the module.
+
+*on-update*: ++
+	typeof: string ++
+	Command to execute when the module is updated.
+
+*on-scroll-up*: ++
+	typeof: string ++
+	Command to execute when scrolling up on the module.
+
+*on-scroll-down*: ++
+	typeof: string ++
+	Command to execute when scrolling down on the module.
+
+*smooth-scrolling-threshold*: ++
+	typeof: double ++
+	Threshold to be used when scrolling.
+
+*tooltip*: ++
+	typeof: bool ++
+	default: true ++
+	Option to disable tooltip on hover.
+
+# FORMAT REPLACEMENTS
+
+*{status}*: status (*activated* or *deactivated*)
+
+*{icon}*: Icon, as defined in *format-icons*
+
+# EXAMPLES
+
+```
+"inhibitor": {
+	"what": "handle-lid-switch",
+	"format": "{icon}",
+	"format-icons": {
+	    "activated": "",
+	    "deactivated": ""
+	}
+}
+```

man/waybar-sway-language.5.scd

@@ -37,6 +37,8 @@ Addressed by *sway/language*
 
 *{variant}*: Variant of layout (e.g. "dvorak").
 
+*{flag}*: Country flag of layout.
+
 # EXAMPLES
 
 ```

man/waybar.5.scd.in

@@ -72,14 +72,19 @@ Also a minimal example configuration can be found on the at the bottom of this m
 	typeof: string ++
 	Optional name added as a CSS class, for styling multiple waybars.
 
+*mode* ++
+	typeof: string ++
+	Selects one of the preconfigured display modes. This is an equivalent of the sway-bar(5) *mode* command and supports the same values: *dock*, *hide*, *invisible*, *overlay*. ++
+	Note: *hide* and *invisible* modes may be not as useful without Sway IPC.
+
 *exclusive* ++
 	typeof: bool ++
-	default: *true* unless the layer is set to *overlay* ++
+	default: *true* ++
 	Option to request an exclusive zone from the compositor. Disable this to allow drawing application windows underneath or on top of the bar.
 
 *passthrough* ++
 	typeof: bool ++
-	default: *false* unless the layer is set to *overlay* ++
+	default: *false* ++
 	Option to pass any pointer events to the window under the bar.
 	Intended to be used with either *top* or *overlay* layers and without exclusive zone.
 
@@ -89,6 +94,16 @@ Also a minimal example configuration can be found on the at the bottom of this m
 	Option to disable the use of gtk-layer-shell for popups.
 	Only functional if compiled with gtk-layer-shell support.
 
+*ipc* ++
+	typeof: bool ++
+	default: false ++
+	Option to subscribe to the Sway IPC bar configuration and visibility events and control waybar with *swaymsg bar* commands. ++
+	Requires *bar_id* value from sway configuration to be either passed with the *-b* commandline argument or specified with the *id* option.
+
+*id* ++
+	typeof: string ++
+	*bar_id* for the Sway IPC. Use this if you need to override the value passed with the *-b bar_id* commandline argument for the specific bar instance.
+
 *include* ++
 	typeof: string|array ++
 	Paths to additional configuration files.
@@ -203,6 +218,28 @@ When positioning Waybar on the left or right side of the screen, sometimes it's
 
 Valid options for the "rotate" property are: 0, 90, 180 and 270.
 
+## Grouping modules
+
+Module groups allow stacking modules in the direction orthogonal to the bar direction. When the bar is positioned on the top or bottom of the screen, modules in a group are stacked vertically. Likewise, when positioned on the left or right, modules in a group are stacked horizontally.
+
+A module group is defined by specifying a module named "group/some-group-name". The group must also be configured with a list of contained modules. Example:
+
+```
+{
+	"modules-right": ["group/hardware", "clock"],
+
+	"group/hardware": {
+		"modules": [
+			"cpu",
+			"memory",
+			"battery"
+		]
+	},
+
+	...
+}
+```
+
 # SUPPORTED MODULES
 
 - *waybar-backlight(5)*

meson.build

@@ -86,7 +86,7 @@ wayland_cursor = dependency('wayland-cursor')
 wayland_protos = dependency('wayland-protocols')
 gtkmm = dependency('gtkmm-3.0', version : ['>=3.22.0'])
 dbusmenu_gtk = dependency('dbusmenu-gtk3-0.4', required: get_option('dbusmenu-gtk'))
-giounix = dependency('gio-unix-2.0', required: get_option('dbusmenu-gtk'))
+giounix = dependency('gio-unix-2.0', required: (get_option('dbusmenu-gtk').enabled() or get_option('logind').enabled()))
 jsoncpp = dependency('jsoncpp')
 sigcpp = dependency('sigc++-2.0')
 libepoll = dependency('epoll-shim', required: false)
@@ -150,6 +150,7 @@ src_files = files(
     'src/bar.cpp',
     'src/client.cpp',
     'src/config.cpp',
+    'src/group.cpp',
     'src/util/ustring_clen.cpp'
 )
 
@@ -177,6 +178,7 @@ endif
 add_project_arguments('-DHAVE_SWAY', language: 'cpp')
 src_files += [
     'src/modules/sway/ipc/client.cpp',
+    'src/modules/sway/bar.cpp',
     'src/modules/sway/mode.cpp',
     'src/modules/sway/language.cpp',
     'src/modules/sway/window.cpp',
@@ -240,6 +242,11 @@ if libsndio.found()
     src_files += 'src/modules/sndio.cpp'
 endif
 
+if (giounix.found() and not get_option('logind').disabled())
+    add_project_arguments('-DHAVE_GIO_UNIX', language: 'cpp')
+    src_files += 'src/modules/inhibitor.cpp'
+endif
+
 if get_option('rfkill').enabled()
     if is_linux
         add_project_arguments('-DWANT_RFKILL', language: 'cpp')
@@ -257,6 +264,10 @@ else
     src_files += 'src/modules/simpleclock.cpp'
 endif
 
+if get_option('experimental')
+    add_project_arguments('-DUSE_EXPERIMENTAL', language: 'cpp')
+endif
+
 subdir('protocol')
 
 executable(
@@ -341,6 +352,10 @@ if scdoc.found()
         'waybar-sndio.5.scd',
     ]
 
+    if (giounix.found() and not get_option('logind').disabled())
+        man_files += 'waybar-inhibitor.5.scd'
+    endif
+
     foreach file : man_files
         path = '@0@'.format(file)
         basename = path.split('/')[-1]
@@ -383,3 +398,4 @@ if clangtidy.found()
             '-p', meson.build_root()
         ] + src_files)
 endif
+

meson_options.txt

@@ -10,4 +10,6 @@ option('mpd', type: 'feature', value: 'auto', description: 'Enable support for t
 option('gtk-layer-shell', type: 'feature', value: 'auto', description: 'Use gtk-layer-shell library for popups support')
 option('rfkill', type: 'feature', value: 'auto', description: 'Enable support for RFKILL')
 option('sndio', type: 'feature', value: 'auto', description: 'Enable support for sndio')
+option('logind', type: 'feature', value: 'auto', description: 'Enable support for logind')
 option('tests', type: 'feature', value: 'auto', description: 'Enable tests')
+option('experimental', type : 'boolean', value : false, description: 'Enable experimental features')

resources/custom_modules/mediaplayer.py

@@ -110,6 +110,7 @@ def main():
 
     signal.signal(signal.SIGINT, signal_handler)
     signal.signal(signal.SIGTERM, signal_handler)
+    signal.signal(signal.SIGPIPE, signal.SIG_DFL)
 
     for player in manager.props.player_names:
         if arguments.player is not None and arguments.player != player.name:

src/bar.cpp

@@ -9,8 +9,13 @@
 #include "bar.hpp"
 #include "client.hpp"
 #include "factory.hpp"
+#include "group.hpp"
 #include "wlr-layer-shell-unstable-v1-client-protocol.h"
 
+#ifdef HAVE_SWAY
+#include "modules/sway/bar.hpp"
+#endif
+
 namespace waybar {
 static constexpr const char* MIN_HEIGHT_MSG =
     "Requested height: {} is less than the minimum height: {} required by the modules";
@@ -23,6 +28,84 @@ static constexpr const char* BAR_SIZE_MSG = "Bar configured (width: {}, height:
 static constexpr const char* SIZE_DEFINED =
     "{} size is defined in the config file so it will stay like that";
 
+const Bar::bar_mode_map Bar::PRESET_MODES = {  //
+    {"default",
+     {// Special mode to hold the global bar configuration
+      .layer = bar_layer::BOTTOM,
+      .exclusive = true,
+      .passthrough = false,
+      .visible = true}},
+    {"dock",
+     {// Modes supported by the sway config; see man sway-bar(5)
+      .layer = bar_layer::BOTTOM,
+      .exclusive = true,
+      .passthrough = false,
+      .visible = true}},
+    {"hide",
+     {//
+      .layer = bar_layer::TOP,
+      .exclusive = false,
+      .passthrough = false,
+      .visible = true}},
+    {"invisible",
+     {//
+      .layer = bar_layer::BOTTOM,
+      .exclusive = false,
+      .passthrough = true,
+      .visible = false}},
+    {"overlay",
+     {//
+      .layer = bar_layer::TOP,
+      .exclusive = false,
+      .passthrough = true,
+      .visible = true}}};
+
+const std::string_view Bar::MODE_DEFAULT = "default";
+const std::string_view Bar::MODE_INVISIBLE = "invisible";
+const std::string_view DEFAULT_BAR_ID = "bar-0";
+
+/* Deserializer for enum bar_layer */
+void from_json(const Json::Value& j, bar_layer& l) {
+  if (j == "bottom") {
+    l = bar_layer::BOTTOM;
+  } else if (j == "top") {
+    l = bar_layer::TOP;
+  } else if (j == "overlay") {
+    l = bar_layer::OVERLAY;
+  }
+}
+
+/* Deserializer for struct bar_mode */
+void from_json(const Json::Value& j, bar_mode& m) {
+  if (j.isObject()) {
+    if (auto v = j["layer"]; v.isString()) {
+      from_json(v, m.layer);
+    }
+    if (auto v = j["exclusive"]; v.isBool()) {
+      m.exclusive = v.asBool();
+    }
+    if (auto v = j["passthrough"]; v.isBool()) {
+      m.passthrough = v.asBool();
+    }
+    if (auto v = j["visible"]; v.isBool()) {
+      m.visible = v.asBool();
+    }
+  }
+}
+
+/* Deserializer for JSON Object -> map<string compatible type, Value>
+ * Assumes that all the values in the object are deserializable to the same type.
+ */
+template <typename Key, typename Value,
+          typename = std::enable_if_t<std::is_convertible<std::string_view, Key>::value>>
+void from_json(const Json::Value& j, std::map<Key, Value>& m) {
+  if (j.isObject()) {
+    for (auto it = j.begin(); it != j.end(); ++it) {
+      from_json(*it, m[it.key().asString()]);
+    }
+  }
+}
+
 #ifdef HAVE_GTK_LAYER_SHELL
 struct GLSSurfaceImpl : public BarSurface, public sigc::trackable {
   GLSSurfaceImpl(Gtk::Window& window, struct waybar_output& output) : window_{window} {
@@ -391,7 +474,6 @@ waybar::Bar::Bar(struct waybar_output* w_output, const Json::Value& w_config)
     : output(w_output),
       config(w_config),
       window{Gtk::WindowType::WINDOW_TOPLEVEL},
-      layer_{bar_layer::BOTTOM},
       left_(Gtk::ORIENTATION_HORIZONTAL, 0),
       center_(Gtk::ORIENTATION_HORIZONTAL, 0),
       right_(Gtk::ORIENTATION_HORIZONTAL, 0),
@@ -403,27 +485,6 @@ waybar::Bar::Bar(struct waybar_output* w_output, const Json::Value& w_config)
   window.get_style_context()->add_class(config["name"].asString());
   window.get_style_context()->add_class(config["position"].asString());
 
-  if (config["layer"] == "top") {
-    layer_ = bar_layer::TOP;
-  } else if (config["layer"] == "overlay") {
-    layer_ = bar_layer::OVERLAY;
-  }
-
-  if (config["exclusive"].isBool()) {
-    exclusive = config["exclusive"].asBool();
-  } else if (layer_ == bar_layer::OVERLAY) {
-    // swaybar defaults: overlay mode does not reserve an exclusive zone
-    exclusive = false;
-  }
-
-  bool passthrough = false;
-  if (config["passthrough"].isBool()) {
-    passthrough = config["passthrough"].asBool();
-  } else if (layer_ == bar_layer::OVERLAY) {
-    // swaybar defaults: overlay mode does not accept pointer events.
-    passthrough = true;
-  }
-
   auto position = config["position"].asString();
 
   if (position == "right" || position == "left") {
@@ -505,15 +566,43 @@ waybar::Bar::Bar(struct waybar_output* w_output, const Json::Value& w_config)
     surface_impl_ = std::make_unique<RawSurfaceImpl>(window, *output);
   }
 
-  surface_impl_->setLayer(layer_);
-  surface_impl_->setExclusiveZone(exclusive);
   surface_impl_->setMargins(margins_);
-  surface_impl_->setPassThrough(passthrough);
   surface_impl_->setPosition(position);
   surface_impl_->setSize(width, height);
 
+  /* Read custom modes if available */
+  if (auto modes = config.get("modes", {}); modes.isObject()) {
+    from_json(modes, configured_modes);
+  }
+
+  /* Update "default" mode with the global bar options */
+  from_json(config, configured_modes[MODE_DEFAULT]);
+
+  if (auto mode = config.get("mode", {}); mode.isString()) {
+    setMode(config["mode"].asString());
+  } else {
+    setMode(MODE_DEFAULT);
+  }
+
   window.signal_map_event().connect_notify(sigc::mem_fun(*this, &Bar::onMap));
 
+#if HAVE_SWAY
+  if (auto ipc = config["ipc"]; ipc.isBool() && ipc.asBool()) {
+    bar_id = Client::inst()->bar_id;
+    if (auto id = config["id"]; id.isString()) {
+      bar_id = id.asString();
+    }
+    if (bar_id.empty()) {
+      bar_id = DEFAULT_BAR_ID;
+    }
+    try {
+      _ipc_client = std::make_unique<BarIpcClient>(*this);
+    } catch (const std::exception& exc) {
+      spdlog::warn("Failed to open bar ipc connection: {}", exc.what());
+    }
+  }
+#endif
+
   setupWidgets();
   window.show_all();
 
@@ -528,6 +617,44 @@ waybar::Bar::Bar(struct waybar_output* w_output, const Json::Value& w_config)
   }
 }
 
+/* Need to define it here because of forward declared members */
+waybar::Bar::~Bar() = default;
+
+void waybar::Bar::setMode(const std::string_view& mode) {
+  using namespace std::literals::string_literals;
+
+  auto style = window.get_style_context();
+  /* remove styles added by previous setMode calls */
+  style->remove_class("mode-"s + last_mode_);
+
+  auto it = configured_modes.find(mode);
+  if (it != configured_modes.end()) {
+    last_mode_ = mode;
+    style->add_class("mode-"s + last_mode_);
+    setMode(it->second);
+  } else {
+    spdlog::warn("Unknown mode \"{}\" requested", mode);
+    last_mode_ = MODE_DEFAULT;
+    style->add_class("mode-"s + last_mode_);
+    setMode(configured_modes.at(MODE_DEFAULT));
+  }
+}
+
+void waybar::Bar::setMode(const struct bar_mode& mode) {
+  surface_impl_->setLayer(mode.layer);
+  surface_impl_->setExclusiveZone(mode.exclusive);
+  surface_impl_->setPassThrough(mode.passthrough);
+
+  if (mode.visible) {
+    window.get_style_context()->remove_class("hidden");
+    window.set_opacity(1);
+  } else {
+    window.get_style_context()->add_class("hidden");
+    window.set_opacity(0);
+  }
+  surface_impl_->commit();
+}
+
 void waybar::Bar::onMap(GdkEventAny*) {
   /*
    * Obtain a pointer to the custom layer surface for modules that require it (idle_inhibitor).
@@ -538,17 +665,7 @@ void waybar::Bar::onMap(GdkEventAny*) {
 
 void waybar::Bar::setVisible(bool value) {
   visible = value;
-  if (!visible) {
+  setMode(visible ? MODE_DEFAULT : MODE_INVISIBLE);
-    window.get_style_context()->add_class("hidden");
-    window.set_opacity(0);
-    surface_impl_->setLayer(bar_layer::BOTTOM);
-  } else {
-    window.get_style_context()->remove_class("hidden");
-    window.set_opacity(1);
-    surface_impl_->setLayer(layer_);
-  }
-  surface_impl_->setExclusiveZone(exclusive && visible);
-  surface_impl_->commit();
 }
 
 void waybar::Bar::toggle() { setVisible(!visible); }
@@ -594,19 +711,7 @@ void waybar::Bar::setupAltFormatKeyForModuleList(const char* module_list_name) {
 }
 
 void waybar::Bar::handleSignal(int signal) {
-  for (auto& module : modules_left_) {
+  for (auto& module : modules_all_) {
-    auto* custom = dynamic_cast<waybar::modules::Custom*>(module.get());
-    if (custom != nullptr) {
-      custom->refresh(signal);
-    }
-  }
-  for (auto& module : modules_center_) {
-    auto* custom = dynamic_cast<waybar::modules::Custom*>(module.get());
-    if (custom != nullptr) {
-      custom->refresh(signal);
-    }
-  }
-  for (auto& module : modules_right_) {
     auto* custom = dynamic_cast<waybar::modules::Custom*>(module.get());
     if (custom != nullptr) {
       custom->refresh(signal);
@@ -614,19 +719,36 @@ void waybar::Bar::handleSignal(int signal) {
   }
 }
 
-void waybar::Bar::getModules(const Factory& factory, const std::string& pos) {
+void waybar::Bar::getModules(const Factory& factory, const std::string& pos, Gtk::Box* group = nullptr) {
-  if (config[pos].isArray()) {
+  auto module_list = group ? config[pos]["modules"] : config[pos];
-    for (const auto& name : config[pos]) {
+  if (module_list.isArray()) {
+    for (const auto& name : module_list) {
       try {
-        auto module = factory.makeModule(name.asString());
+        auto ref = name.asString();
+        AModule* module;
+
+        if (ref.compare(0, 6, "group/") == 0 && ref.size() > 6) {
+          auto group_module = new waybar::Group(ref, *this, config[ref]);
+          getModules(factory, ref, &group_module->box);
+          module = group_module;
+        } else {
+          module = factory.makeModule(ref);
+        }
+
+        std::shared_ptr<AModule> module_sp(module);
+        modules_all_.emplace_back(module_sp);
+        if (group) {
+          group->pack_start(*module, false, false);
+        } else {
           if (pos == "modules-left") {
-          modules_left_.emplace_back(module);
+            modules_left_.emplace_back(module_sp);
           }
           if (pos == "modules-center") {
-          modules_center_.emplace_back(module);
+            modules_center_.emplace_back(module_sp);
           }
           if (pos == "modules-right") {
-          modules_right_.emplace_back(module);
+            modules_right_.emplace_back(module_sp);
+          }
         }
         module->dp.connect([module, &name] {
           try {

src/client.cpp

@@ -199,7 +199,6 @@ int waybar::Client::main(int argc, char *argv[]) {
   bool        show_version = false;
   std::string config_opt;
   std::string style_opt;
-  std::string bar_id;
   std::string log_level;
   auto        cli = clara::detail::Help(show_help) |
              clara::detail::Opt(show_version)["-v"]["--version"]("Show version") |

src/factory.cpp

@@ -30,10 +30,12 @@ waybar::AModule* waybar::Factory::makeModule(const std::string& name) const {
     if (ref == "wlr/taskbar") {
       return new waybar::modules::wlr::Taskbar(id, bar_, config_[name]);
     }
+#ifdef USE_EXPERIMENTAL
     if (ref == "wlr/workspaces") {
       return new waybar::modules::wlr::WorkspaceManager(id, bar_, config_[name]);
     }
 #endif
+#endif
 #ifdef HAVE_RIVER
     if (ref == "river/tags") {
       return new waybar::modules::river::Tags(id, bar_, config_[name]);
@@ -92,6 +94,11 @@ waybar::AModule* waybar::Factory::makeModule(const std::string& name) const {
     if (ref == "sndio") {
       return new waybar::modules::Sndio(id, config_[name]);
     }
+#endif
+#ifdef HAVE_GIO_UNIX
+    if (ref == "inhibitor") {
+      return new waybar::modules::Inhibitor(id, bar_, config_[name]);
+    }
 #endif
     if (ref == "temperature") {
       return new waybar::modules::Temperature(id, config_[name]);

src/group.cpp

@@ -0,0 +1,19 @@
+#include "group.hpp"
+#include <fmt/format.h>
+#include <util/command.hpp>
+
+namespace waybar {
+
+Group::Group(const std::string& name, const Bar& bar, const Json::Value& config)
+    : AModule(config, name, "", false, false),
+      box{bar.vertical ? Gtk::ORIENTATION_HORIZONTAL : Gtk::ORIENTATION_VERTICAL, 0}
+    {
+}
+
+auto Group::update() -> void {
+  // noop
+}
+
+Group::operator Gtk::Widget&() { return box; }
+
+}  // namespace waybar

src/modules/clock.cpp

@@ -14,17 +14,51 @@
 using waybar::modules::waybar_time;
 
 waybar::modules::Clock::Clock(const std::string& id, const Json::Value& config)
-    : ALabel(config, "clock", id, "{:%H:%M}", 60, false, false, true), fixed_time_zone_(false) {
+    : ALabel(config, "clock", id, "{:%H:%M}", 60, false, false, true),
+      current_time_zone_idx_(0),
+      is_calendar_in_tooltip_(false)
+{
   if (config_["timezones"].isArray() && !config_["timezones"].empty()) {
-    time_zone_idx_ = 0;
+    for (const auto& zone_name: config_["timezones"]) {
-    setTimeZone(config_["timezones"][time_zone_idx_]);
+      if (!zone_name.isString() || zone_name.asString().empty()) {
-  } else {
+        time_zones_.push_back(nullptr);
-    setTimeZone(config_["timezone"]);
+        continue;
       }
-  if (fixed_time_zone_) {
+      time_zones_.push_back(
+        date::locate_zone(
+          zone_name.asString()
+        )
+      );
+    }
+  } else if (config_["timezone"].isString() && !config_["timezone"].asString().empty()) {
+    time_zones_.push_back(
+        date::locate_zone(
+          config_["timezone"].asString()
+        )
+      );
+  }
+
+  // If all timezones are parsed and no one is good, add nullptr to the timezones vector, to mark that local time should be shown.
+  if (!time_zones_.size()) {
+    time_zones_.push_back(nullptr);
+  }
+
+  if (!is_timezone_fixed()) {
     spdlog::warn("As using a timezone, some format args may be missing as the date library haven't got a release since 2018.");
   }
 
+  // Check if a particular placeholder is present in the tooltip format, to know what to calculate on update.
+  if (config_["tooltip-format"].isString()) {
+    std::string trimmed_format = config_["tooltip-format"].asString();
+    trimmed_format.erase(std::remove_if(trimmed_format.begin(),
+                              trimmed_format.end(),
+                              [](unsigned char x){return std::isspace(x);}),
+               trimmed_format.end());
+    if (trimmed_format.find("{" + kCalendarPlaceholder + "}") != std::string::npos) {
+      is_calendar_in_tooltip_ = true;
+    }
+  }
+
   if (config_["locale"].isString()) {
     locale_ = std::locale(config_["locale"].asString());
   } else {
@@ -40,53 +74,46 @@ waybar::modules::Clock::Clock(const std::string& id, const Json::Value& config)
   };
 }
 
-auto waybar::modules::Clock::update() -> void {
+const date::time_zone* waybar::modules::Clock::current_timezone() {
-  if (!fixed_time_zone_) {
+  return time_zones_[current_time_zone_idx_] ? time_zones_[current_time_zone_idx_] : date::current_zone();
-    // Time zone can change. Be sure to pick that.
+}
-    time_zone_ = date::current_zone();
-  }
 
+bool waybar::modules::Clock::is_timezone_fixed() {
+  return time_zones_[current_time_zone_idx_] != nullptr;
+}
+
+auto waybar::modules::Clock::update() -> void {
+  auto time_zone = current_timezone();
   auto now = std::chrono::system_clock::now();
   waybar_time wtime = {locale_,
-                       date::make_zoned(time_zone_, date::floor<std::chrono::seconds>(now))};
+                       date::make_zoned(time_zone, date::floor<std::chrono::seconds>(now))};
-
+  std::string text = "";
-  std::string text;
+  if (!is_timezone_fixed()) {
-  if (!fixed_time_zone_) {
     // As date dep is not fully compatible, prefer fmt
     tzset();
     auto localtime = fmt::localtime(std::chrono::system_clock::to_time_t(now));
     text = fmt::format(format_, localtime);
-    label_.set_markup(text);
   } else {
     text = fmt::format(format_, wtime);
-    label_.set_markup(text);
   }
+  label_.set_markup(text);
 
   if (tooltipEnabled()) {
     if (config_["tooltip-format"].isString()) {
-      const auto calendar = calendar_text(wtime);
+      std::string calendar_lines = "";
+      if (is_calendar_in_tooltip_) {
+        calendar_lines = calendar_text(wtime);
+      }
       auto tooltip_format = config_["tooltip-format"].asString();
-      auto       tooltip_text = fmt::format(tooltip_format, wtime, fmt::arg("calendar", calendar));
+      text = fmt::format(tooltip_format, wtime, fmt::arg(kCalendarPlaceholder.c_str(), calendar_lines));
-      label_.set_tooltip_markup(tooltip_text);
+    }
-    } else {
+  }
+
   label_.set_tooltip_markup(text);
-    }
-  }
   // Call parent update
   ALabel::update();
 }
 
-bool waybar::modules::Clock::setTimeZone(Json::Value zone_name) {
-  if (!zone_name.isString() || zone_name.asString().empty()) {
-      fixed_time_zone_ = false;
-      return false;
-  }
-
-  time_zone_ = date::locate_zone(zone_name.asString());
-  fixed_time_zone_ = true;
-  return true;
-}
-
 bool waybar::modules::Clock::handleScroll(GdkEventScroll *e) {
   // defer to user commands if set
   if (config_["on-scroll-up"].isString() || config_["on-scroll-down"].isString()) {
@@ -97,17 +124,18 @@ bool waybar::modules::Clock::handleScroll(GdkEventScroll *e) {
   if (dir != SCROLL_DIR::UP && dir != SCROLL_DIR::DOWN) {
     return true;
   }
-  if (!config_["timezones"].isArray() || config_["timezones"].empty()) {
+  if (time_zones_.size() == 1) {
     return true;
   }
-  auto nr_zones = config_["timezones"].size();
+
+  auto nr_zones = time_zones_.size();
   if (dir == SCROLL_DIR::UP) {
-    size_t new_idx = time_zone_idx_ + 1;
+    size_t new_idx = current_time_zone_idx_ + 1;
-    time_zone_idx_ = new_idx == nr_zones ? 0 : new_idx;
+    current_time_zone_idx_ = new_idx == nr_zones ? 0 : new_idx;
   } else {
-    time_zone_idx_ = time_zone_idx_ == 0 ? nr_zones - 1 : time_zone_idx_ - 1;
+    current_time_zone_idx_ = current_time_zone_idx_ == 0 ? nr_zones - 1 : current_time_zone_idx_ - 1;
   }
-  setTimeZone(config_["timezones"][time_zone_idx_]);
+
   update();
   return true;
 }

src/modules/inhibitor.cpp

@@ -0,0 +1,175 @@
+#include "modules/inhibitor.hpp"
+
+#include <gio/gio.h>
+#include <gio/gunixfdlist.h>
+#include <spdlog/spdlog.h>
+
+namespace {
+
+using DBus = std::unique_ptr<GDBusConnection, void(*)(GDBusConnection*)>;
+
+auto dbus() -> DBus {
+  GError *error = nullptr;
+  GDBusConnection* connection =
+      g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error);
+
+  if (error) {
+    spdlog::error("g_bus_get_sync() failed: {}", error->message);
+    g_error_free(error);
+    connection = nullptr;
+  }
+
+  auto destructor = [](GDBusConnection* connection) {
+      GError *error = nullptr;
+      g_dbus_connection_close_sync(connection, nullptr, &error);
+      if (error) {
+        spdlog::error(
+            "g_bus_connection_close_sync failed(): {}",
+            error->message);
+        g_error_free(error);
+      }
+  };
+
+  return DBus{connection, destructor};
+}
+
+auto getLocks(const DBus& bus, const std::string& inhibitors) -> int {
+  GError *error = nullptr;
+  GUnixFDList* fd_list;
+  int handle;
+
+  auto reply = g_dbus_connection_call_with_unix_fd_list_sync(bus.get(),
+      "org.freedesktop.login1",
+      "/org/freedesktop/login1",
+      "org.freedesktop.login1.Manager",
+      "Inhibit",
+      g_variant_new(
+          "(ssss)",
+          inhibitors.c_str(),
+          "waybar",
+          "Asked by user",
+          "block"),
+      G_VARIANT_TYPE("(h)"),
+      G_DBUS_CALL_FLAGS_NONE,
+      -1,
+      nullptr,
+      &fd_list,
+      nullptr,
+      &error);
+  if (error) {
+    spdlog::error(
+        "g_dbus_connection_call_with_unix_fd_list_sync() failed: {}",
+        error->message);
+    g_error_free(error);
+    handle = -1;
+  } else {
+    gint index;
+    g_variant_get(reply, "(h)", &index);
+    g_variant_unref(reply);
+    handle = g_unix_fd_list_get(fd_list, index, nullptr);
+    g_object_unref(fd_list);
+  }
+
+  return handle;
+}
+
+auto checkInhibitor(const std::string& inhibitor) -> const std::string& {
+  static const auto inhibitors = std::array{
+      "idle",
+      "shutdown",
+      "sleep",
+      "handle-power-key",
+      "handle-suspend-key",
+      "handle-hibernate-key",
+      "handle-lid-switch"
+  };
+
+  if (std::find(inhibitors.begin(), inhibitors.end(), inhibitor)
+          == inhibitors.end()) {
+    throw std::runtime_error("invalid logind inhibitor " + inhibitor);
+  }
+
+  return inhibitor;
+}
+
+auto getInhibitors(const Json::Value& config) -> std::string {
+  std::string inhibitors = "idle";
+
+  if (config["what"].empty()) {
+    return inhibitors;
+  }
+
+  if (config["what"].isString()) {
+    return checkInhibitor(config["what"].asString());
+  }
+
+  if (config["what"].isArray()) {
+    inhibitors = checkInhibitor(config["what"][0].asString());
+    for (decltype(config["what"].size()) i = 1; i < config["what"].size(); ++i) {
+      inhibitors += ":" + checkInhibitor(config["what"][i].asString());
+    }
+    return inhibitors;
+  }
+
+  return inhibitors;
+}
+
+}
+
+namespace waybar::modules {
+
+Inhibitor::Inhibitor(const std::string& id, const Bar& bar,
+                     const Json::Value& config)
+    : ALabel(config, "inhibitor", id, "{status}", true),
+      dbus_(::dbus()),
+      inhibitors_(::getInhibitors(config)) {
+  event_box_.add_events(Gdk::BUTTON_PRESS_MASK);
+  event_box_.signal_button_press_event().connect(
+      sigc::mem_fun(*this, &Inhibitor::handleToggle));
+  dp.emit();
+}
+
+Inhibitor::~Inhibitor() {
+  if (handle_ != -1) {
+    ::close(handle_);
+  }
+}
+
+auto Inhibitor::activated() -> bool {
+  return handle_ != -1;
+}
+
+auto Inhibitor::update() -> void {
+  std::string status_text = activated() ? "activated" : "deactivated";
+
+  label_.get_style_context()->remove_class(
+      activated() ? "deactivated" : "activated");
+  label_.set_markup(
+      fmt::format(format_, fmt::arg("status", status_text),
+      fmt::arg("icon", getIcon(0, status_text))));
+  label_.get_style_context()->add_class(status_text);
+
+  if (tooltipEnabled()) {
+    label_.set_tooltip_text(status_text);
+  }
+
+  return ALabel::update();
+}
+
+auto Inhibitor::handleToggle(GdkEventButton* const& e) -> bool {
+  if (e->button == 1) {
+    if (activated()) {
+      ::close(handle_);
+      handle_ = -1;
+    } else {
+      handle_ = ::getLocks(dbus_, inhibitors_);
+      if (handle_ == -1) {
+        spdlog::error("cannot get inhibitor locks");
+      }
+    }
+  }
+
+  return ALabel::handleToggle(e);
+}
+
+} // waybar::modules

src/modules/network.cpp

@@ -789,8 +789,8 @@ void waybar::modules::Network::parseSignal(struct nlattr **bss) {
     // signalstrength in dBm from mBm
     signal_strength_dbm_ = nla_get_s32(bss[NL80211_BSS_SIGNAL_MBM]) / 100;
 
-    // WiFi-hardware usually operates in the range -90 to -20dBm.
+    // WiFi-hardware usually operates in the range -90 to -30dBm.
-    const int hardwareMax = -20;
+    const int hardwareMax = -30;
     const int hardwareMin = -90;
     const int strength =
       ((signal_strength_dbm_ - hardwareMin) / double{hardwareMax - hardwareMin}) * 100;

src/modules/pulseaudio.cpp

@@ -79,6 +79,13 @@ bool waybar::modules::Pulseaudio::handleScroll(GdkEventScroll *e) {
   if (dir == SCROLL_DIR::NONE) {
     return true;
   }
+  if (config_["reverse-scrolling"].asInt() == 1){
+    if (dir == SCROLL_DIR::UP) {
+      dir = SCROLL_DIR::DOWN;
+    } else if (dir == SCROLL_DIR::DOWN) {
+      dir = SCROLL_DIR::UP;
+    }
+  }
   double      volume_tick = static_cast<double>(PA_VOLUME_NORM) / 100;
   pa_volume_t change = volume_tick;
   pa_cvolume  pa_volume = pa_volume_;
@@ -211,7 +218,7 @@ static const std::array<std::string, 9> ports = {
 };
 
 const std::vector<std::string> waybar::modules::Pulseaudio::getPulseIcon() const {
-  std::vector<std::string> res = {default_source_name_};
+  std::vector<std::string> res = {current_sink_name_, default_source_name_};
   std::string nameLC = port_name_ + form_factor_;
   std::transform(nameLC.begin(), nameLC.end(), nameLC.begin(), ::tolower);
   for (auto const &port : ports) {

src/modules/sway/bar.cpp

@@ -0,0 +1,107 @@
+#include "modules/sway/bar.hpp"
+
+#include <fmt/ostream.h>
+#include <spdlog/spdlog.h>
+
+#include <stdexcept>
+
+#include "bar.hpp"
+#include "modules/sway/ipc/ipc.hpp"
+
+namespace waybar::modules::sway {
+
+BarIpcClient::BarIpcClient(waybar::Bar& bar) : bar_{bar} {
+  {
+    sigc::connection handle =
+        ipc_.signal_cmd.connect(sigc::mem_fun(*this, &BarIpcClient::onInitialConfig));
+    ipc_.sendCmd(IPC_GET_BAR_CONFIG, bar_.bar_id);
+
+    handle.disconnect();
+  }
+
+  signal_config_.connect(sigc::mem_fun(*this, &BarIpcClient::onConfigUpdate));
+  signal_visible_.connect(sigc::mem_fun(*this, &BarIpcClient::onVisibilityUpdate));
+
+  ipc_.subscribe(R"(["bar_state_update", "barconfig_update"])");
+  ipc_.signal_event.connect(sigc::mem_fun(*this, &BarIpcClient::onIpcEvent));
+  // Launch worker
+  ipc_.setWorker([this] {
+    try {
+      ipc_.handleEvent();
+    } catch (const std::exception& e) {
+      spdlog::error("BarIpcClient::handleEvent {}", e.what());
+    }
+  });
+}
+
+struct swaybar_config parseConfig(const Json::Value& payload) {
+  swaybar_config conf;
+  if (auto id = payload["id"]; id.isString()) {
+    conf.id = id.asString();
+  }
+  if (auto mode = payload["mode"]; mode.isString()) {
+    conf.mode = mode.asString();
+  }
+  if (auto hs = payload["hidden_state"]; hs.isString()) {
+    conf.hidden_state = hs.asString();
+  }
+  return conf;
+}
+
+void BarIpcClient::onInitialConfig(const struct Ipc::ipc_response& res) {
+  auto payload = parser_.parse(res.payload);
+  if (auto success = payload.get("success", true); !success.asBool()) {
+    auto err = payload.get("error", "Unknown error");
+    throw std::runtime_error(err.asString());
+  }
+  auto config = parseConfig(payload);
+  onConfigUpdate(config);
+}
+
+void BarIpcClient::onIpcEvent(const struct Ipc::ipc_response& res) {
+  try {
+    auto payload = parser_.parse(res.payload);
+    if (auto id = payload["id"]; id.isString() && id.asString() != bar_.bar_id) {
+      spdlog::trace("swaybar ipc: ignore event for {}", id.asString());
+      return;
+    }
+    if (payload.isMember("visible_by_modifier")) {
+      // visibility change for hidden bar
+      signal_visible_(payload["visible_by_modifier"].asBool());
+    } else {
+      // configuration update
+      auto config = parseConfig(payload);
+      signal_config_(std::move(config));
+    }
+  } catch (const std::exception& e) {
+    spdlog::error("BarIpcClient::onEvent {}", e.what());
+  }
+}
+
+void BarIpcClient::onConfigUpdate(const swaybar_config& config) {
+  spdlog::info("config update for {}: id {}, mode {}, hidden_state {}",
+               bar_.bar_id,
+               config.id,
+               config.mode,
+               config.hidden_state);
+  bar_config_ = config;
+  update();
+}
+
+void BarIpcClient::onVisibilityUpdate(bool visible_by_modifier) {
+  spdlog::debug("visiblity update for {}: {}", bar_.bar_id, visible_by_modifier);
+  visible_by_modifier_ = visible_by_modifier;
+  update();
+}
+
+void BarIpcClient::update() {
+  bool visible = visible_by_modifier_;
+  if (bar_config_.mode == "invisible") {
+    visible = false;
+  } else if (bar_config_.mode != "hide" || bar_config_.hidden_state != "hide") {
+    visible = true;
+  }
+  bar_.setMode(visible ? bar_config_.mode : Bar::MODE_INVISIBLE);
+}
+
+}  // namespace waybar::modules::sway

src/modules/sway/language.cpp

@@ -99,7 +99,8 @@ auto Language::update() -> void {
                                          fmt::arg("short", layout_.short_name),
                                          fmt::arg("shortDescription", layout_.short_description),
                                          fmt::arg("long", layout_.full_name),
-                                         fmt::arg("variant", layout_.variant)));
+                                         fmt::arg("variant", layout_.variant),
+                                         fmt::arg("flag", layout_.country_flag())));
   label_.set_markup(display_layout);
   if (tooltipEnabled()) {
     if (tooltip_format_ != "") {
@@ -107,7 +108,8 @@ auto Language::update() -> void {
                                                      fmt::arg("short", layout_.short_name),
                                                      fmt::arg("shortDescription", layout_.short_description),
                                                      fmt::arg("long", layout_.full_name),
-                                                     fmt::arg("variant", layout_.variant)));
+                                                     fmt::arg("variant", layout_.variant),
+                                                     fmt::arg("flag", layout_.country_flag())));
       label_.set_tooltip_markup(tooltip_display_layout);
     } else {
       label_.set_tooltip_markup(display_layout);
@@ -212,4 +214,15 @@ Language::XKBContext::~XKBContext() {
   rxkb_context_unref(context_);
   delete layout_;
 }
+
+std::string Language::Layout::country_flag() const {
+  if (short_name.size() != 2) return "";
+  unsigned char result[] = "\xf0\x9f\x87\x00\xf0\x9f\x87\x00";
+  result[3] = short_name[0] + 0x45;
+  result[7] = short_name[1] + 0x45;
+  // Check if both emojis are in A-Z symbol bounds
+  if (result[3] < 0xa6 || result[3] > 0xbf) return "";
+  if (result[7] < 0xa6 || result[7] > 0xbf) return "";
+  return std::string{reinterpret_cast<char*>(result)};
+}
 }  // namespace waybar::modules::sway

test/GlibTestsFixture.hpp

@@ -0,0 +1,24 @@
+#pragma once
+#include <glibmm/main.h>
+/**
+ * Minimal Glib application to be used for tests that require Glib main loop
+ */
+class GlibTestsFixture : public sigc::trackable {
+ public:
+  GlibTestsFixture() : main_loop_{Glib::MainLoop::create()} {}
+
+  void setTimeout(int timeout) {
+    Glib::signal_timeout().connect_once([]() { throw std::runtime_error("Test timed out"); },
+                                        timeout);
+  }
+
+  void run(std::function<void()> fn) {
+    Glib::signal_idle().connect_once(fn);
+    main_loop_->run();
+  }
+
+  void quit() { main_loop_->quit(); }
+
+ protected:
+  Glib::RefPtr<Glib::MainLoop> main_loop_;
+};

test/SafeSignal.cpp

@@ -0,0 +1,145 @@
+#define CATCH_CONFIG_RUNNER
+#include "util/SafeSignal.hpp"
+
+#include <glibmm.h>
+
+#include <catch2/catch.hpp>
+#include <thread>
+#include <type_traits>
+
+#include "GlibTestsFixture.hpp"
+
+using namespace waybar;
+
+template <typename T>
+using remove_cvref_t = typename std::remove_cv<typename std::remove_reference<T>::type>::type;
+
+/**
+ * Basic sanity test for SafeSignal:
+ * check that type deduction works, events are delivered and the order is right
+ * Running this with -fsanitize=thread should not fail
+ */
+TEST_CASE_METHOD(GlibTestsFixture, "SafeSignal basic functionality", "[signal][thread][util]") {
+  const int NUM_EVENTS = 100;
+  int       count = 0;
+  int       last_value = 0;
+
+  SafeSignal<int, std::string> test_signal;
+
+  const auto  main_tid = std::this_thread::get_id();
+  std::thread producer;
+
+  // timeout the test in 500ms
+  setTimeout(500);
+
+  test_signal.connect([&](auto val, auto str) {
+    static_assert(std::is_same<int, decltype(val)>::value);
+    static_assert(std::is_same<std::string, decltype(str)>::value);
+    // check that we're in the same thread as the main loop
+    REQUIRE(std::this_thread::get_id() == main_tid);
+    // check event order
+    REQUIRE(val == last_value + 1);
+
+    last_value = val;
+    if (++count >= NUM_EVENTS) {
+      this->quit();
+    };
+  });
+
+  run([&]() {
+    // check that events from the same thread are delivered and processed synchronously
+    test_signal.emit(1, "test");
+    REQUIRE(count == 1);
+
+    // start another thread and generate events
+    producer = std::thread([&]() {
+      for (auto i = 2; i <= NUM_EVENTS; ++i) {
+        test_signal.emit(i, "test");
+      }
+    });
+  });
+  producer.join();
+  REQUIRE(count == NUM_EVENTS);
+}
+
+template <typename T>
+struct TestObject {
+  T        value;
+  unsigned copied = 0;
+  unsigned moved = 0;
+
+  TestObject(const T& v) : value(v){};
+  ~TestObject() = default;
+
+  TestObject(const TestObject& other)
+      : value(other.value), copied(other.copied + 1), moved(other.moved) {}
+
+  TestObject(TestObject&& other) noexcept
+      : value(std::move(other.value)),
+        copied(std::exchange(other.copied, 0)),
+        moved(std::exchange(other.moved, 0) + 1) {}
+
+  TestObject& operator=(const TestObject& other) {
+    value = other.value;
+    copied = other.copied + 1;
+    moved = other.moved;
+    return *this;
+  }
+
+  TestObject& operator=(TestObject&& other) noexcept {
+    value = std::move(other.value);
+    copied = std::exchange(other.copied, 0);
+    moved = std::exchange(other.moved, 0) + 1;
+    return *this;
+  }
+
+  bool operator==(T other) const { return value == other; }
+       operator T() const { return value; }
+};
+
+/*
+ * Check the number of copies/moves performed on the object passed through SafeSignal
+ */
+TEST_CASE_METHOD(GlibTestsFixture, "SafeSignal copy/move counter", "[signal][thread][util]") {
+  const int NUM_EVENTS = 3;
+  int       count = 0;
+
+  SafeSignal<TestObject<int>> test_signal;
+
+  std::thread producer;
+
+  // timeout the test in 500ms
+  setTimeout(500);
+
+  test_signal.connect([&](auto& val) {
+    static_assert(std::is_same<TestObject<int>, remove_cvref_t<decltype(val)>>::value);
+
+    /* explicit move in the producer thread */
+    REQUIRE(val.moved <= 1);
+    /* copy within the SafeSignal queuing code */
+    REQUIRE(val.copied <= 1);
+
+    if (++count >= NUM_EVENTS) {
+      this->quit();
+    };
+  });
+
+  run([&]() {
+    test_signal.emit(1);
+    REQUIRE(count == 1);
+    producer = std::thread([&]() {
+      for (auto i = 2; i <= NUM_EVENTS; ++i) {
+        TestObject<int> t{i};
+        // check that signal.emit accepts moved objects
+        test_signal.emit(std::move(t));
+      }
+    });
+  });
+  producer.join();
+  REQUIRE(count == NUM_EVENTS);
+}
+
+int main(int argc, char* argv[]) {
+  Glib::init();
+  return Catch::Session().run(argc, argv);
+}

test/meson.build

@@ -2,6 +2,7 @@ test_inc = include_directories('../include')
 test_dep = [
     catch2,
     fmt,
+    gtkmm,
     jsoncpp,
     spdlog,
 ]
@@ -14,8 +15,21 @@ config_test = executable(
     include_directories: test_inc,
 )
 
+safesignal_test = executable(
+    'safesignal_test',
+    'SafeSignal.cpp',
+    dependencies: test_dep,
+    include_directories: test_inc,
+)
+
 test(
     'Configuration test',
     config_test,
     workdir: meson.source_root(),
 )
+
+test(
+    'SafeSignal test',
+    safesignal_test,
+    workdir: meson.source_root(),
+)