Merge branch 'master' into master

.github/workflows/freebsd.yml

@@ -4,12 +4,16 @@ on: [ push, pull_request ]
 
 jobs:
   clang:
-    runs-on: macos-latest # until https://github.com/actions/runner/issues/385
+    # Run actions in a FreeBSD vm on the macos-10.15 runner
+    # https://github.com/actions/runner/issues/385 - for FreeBSD runner support
+    # https://github.com/actions/virtual-environments/issues/4060 - for lack of VirtualBox on MacOS 11 runners
+    runs-on: macos-10.15
     steps:
     - uses: actions/checkout@v2
     - name: Test in FreeBSD VM
-      uses: vmactions/freebsd-vm@v0.1.4 # aka FreeBSD 12.2
+      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

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;
-  bool                  exclusive = true;
+  struct wl_surface    *surface;
   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::unique_ptr<waybar::AModule>> modules_center_;
-  std::vector<std::unique_ptr<waybar::AModule>> modules_right_;
+  std::vector<std::shared_ptr<waybar::AModule>> modules_left_;
+  std::vector<std::shared_ptr<waybar::AModule>> modules_center_;
+  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

@@ -14,6 +14,7 @@
 #endif
 #ifdef HAVE_WLR
 #include "modules/wlr/taskbar.hpp"
+#include "modules/wlr/workspace_manager.hpp"
 #endif
 #ifdef HAVE_RIVER
 #include "modules/river/tags.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_;
-  bool fixed_time_zone_;
-  int time_zone_idx_;
+  std::vector<const date::time_zone*> time_zones_;
+  int current_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/network.hpp

@@ -43,6 +43,7 @@ class Network : public ALabel {
   const std::string getNetworkState() const;
   void              clearIface();
   bool              wildcardMatch(const std::string& pattern, const std::string& text) const;
+  std::optional<std::pair<unsigned long long, unsigned long long>> readBandwidthUsage();
 
   int                ifid_;
   sa_family_t        family_;

include/modules/river/tags.hpp

@@ -6,6 +6,7 @@
 #include "AModule.hpp"
 #include "bar.hpp"
 #include "river-status-unstable-v1-client-protocol.h"
+#include "river-control-unstable-v1-client-protocol.h"
 #include "xdg-output-unstable-v1-client-protocol.h"
 
 namespace waybar::modules::river {
@@ -20,7 +21,12 @@ class Tags : public waybar::AModule {
   void handle_view_tags(struct wl_array *tags);
   void handle_urgent_tags(uint32_t tags);
 
+  void handle_primary_clicked(uint32_t tag);
+  bool handle_button_press(GdkEventButton *event_button, uint32_t tag);
+
   struct zriver_status_manager_v1 *status_manager_;
+  struct zriver_control_v1 *control_;
+  struct wl_seat *seat_;
 
  private:
   const waybar::Bar &      bar_;

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 {
@@ -54,7 +55,7 @@ class Language : public ALabel, public sigc::trackable {
 
   const static std::string XKB_LAYOUT_NAMES_KEY;
   const static std::string XKB_ACTIVE_LAYOUT_NAME_KEY;
-  
+
   Layout                        layout_;
   std::string tooltip_format_ = "";
   std::map<std::string, Layout> layouts_map_;

include/modules/wlr/taskbar.hpp

@@ -61,8 +61,8 @@ class Task
     Gtk::Image icon_;
     Gtk::Label text_before_;
     Gtk::Label text_after_;
-    bool button_visible_;
-    bool ignored_;
+    bool button_visible_ = false;
+    bool ignored_ = false;
 
     bool with_icon_;
     std::string format_before_;
@@ -77,6 +77,7 @@ class Task
    private:
     std::string repr() const;
     std::string state_string(bool = false) const;
+    void hide_if_ignored();
 
    public:
     /* Getter functions */

include/modules/wlr/workspace_manager.hpp

@@ -0,0 +1,160 @@
+#pragma once
+
+#include <fmt/format.h>
+#include <gtkmm/button.h>
+#include <gtkmm/image.h>
+#include <gtkmm/label.h>
+
+#include <functional>
+#include <map>
+#include <memory>
+#include <vector>
+
+#include "AModule.hpp"
+#include "bar.hpp"
+#include "ext-workspace-unstable-v1-client-protocol.h"
+
+namespace waybar::modules::wlr {
+
+class WorkspaceManager;
+class WorkspaceGroup;
+
+class Workspace {
+ public:
+  Workspace(const waybar::Bar &bar, const Json::Value &config, WorkspaceGroup &workspace_group,
+            zext_workspace_handle_v1 *workspace, uint32_t id);
+  ~Workspace();
+  auto update() -> void;
+
+  auto id() const -> uint32_t { return id_; }
+  auto is_active() const -> bool { return state_ & static_cast<uint32_t>(State::ACTIVE); }
+  auto is_urgent() const -> bool { return state_ & static_cast<uint32_t>(State::URGENT); }
+  auto is_hidden() const -> bool { return state_ & static_cast<uint32_t>(State::HIDDEN); }
+  // wlr stuff
+  auto handle_name(const std::string &name) -> void;
+  auto handle_coordinates(const std::vector<uint32_t> &coordinates) -> void;
+  auto handle_state(const std::vector<uint32_t> &state) -> void;
+  auto handle_remove() -> void;
+
+  auto handle_done() -> void;
+  auto handle_clicked(GdkEventButton *bt) -> bool;
+  auto show() -> void;
+  auto hide() -> void;
+  auto get_button_ref() -> Gtk::Button & { return button_; }
+  auto get_name() -> std::string & { return name_; }
+  auto get_coords() -> std::vector<uint32_t> & { return coordinates_; }
+
+  enum class State {
+    ACTIVE = (1 << 0),
+    URGENT = (1 << 1),
+    HIDDEN = (1 << 2),
+  };
+
+ private:
+  auto get_icon() -> std::string;
+
+  const Bar         &bar_;
+  const Json::Value &config_;
+  WorkspaceGroup    &workspace_group_;
+
+  // wlr stuff
+  zext_workspace_handle_v1 *workspace_handle_;
+  uint32_t                  state_ = 0;
+
+  uint32_t                                  id_;
+  std::string                               name_;
+  std::vector<uint32_t>                     coordinates_;
+  static std::map<std::string, std::string> icons_map_;
+  std::string                               format_;
+  bool                                      with_icon_ = false;
+
+  Gtk::Button button_;
+  Gtk::Box    content_;
+  Gtk::Label  label_;
+};
+
+class WorkspaceGroup {
+ public:
+  WorkspaceGroup(const waybar::Bar &bar, Gtk::Box &box, const Json::Value &config,
+                 WorkspaceManager &manager, zext_workspace_group_handle_v1 *workspace_group_handle,
+                 uint32_t id);
+  ~WorkspaceGroup();
+  auto update() -> void;
+
+  auto id() const -> uint32_t { return id_; }
+  auto is_visible() const -> bool;
+  auto remove_workspace(uint32_t id_) -> void;
+  auto active_only() const -> bool;
+  auto creation_delayed() const -> bool;
+  auto workspaces() -> std::vector<std::unique_ptr<Workspace>> & { return workspaces_; }
+
+  auto sort_workspaces() -> void;
+  auto set_need_to_sort() -> void { need_to_sort = true; }
+  auto add_button(Gtk::Button &button) -> void;
+  auto remove_button(Gtk::Button &button) -> void;
+
+  // wlr stuff
+  auto handle_workspace_create(zext_workspace_handle_v1 *workspace_handle) -> void;
+  auto handle_remove() -> void;
+  auto handle_output_enter(wl_output *output) -> void;
+  auto handle_output_leave() -> void;
+  auto handle_done() -> void;
+  auto commit() -> void;
+
+ private:
+  static uint32_t    workspace_global_id;
+  const waybar::Bar &bar_;
+  Gtk::Box          &box_;
+  const Json::Value &config_;
+  WorkspaceManager  &workspace_manager_;
+
+  // wlr stuff
+  zext_workspace_group_handle_v1 *workspace_group_handle_;
+  wl_output                      *output_ = nullptr;
+
+  uint32_t                                id_;
+  std::vector<std::unique_ptr<Workspace>> workspaces_;
+  bool                                    need_to_sort = false;
+};
+
+class WorkspaceManager : public AModule {
+ public:
+  WorkspaceManager(const std::string &id, const waybar::Bar &bar, const Json::Value &config);
+  ~WorkspaceManager() override;
+  auto update() -> void override;
+
+  auto all_outputs() const -> bool { return all_outputs_; }
+  auto active_only() const -> bool { return active_only_; }
+  auto workspace_comparator() const
+      -> std::function<bool(std::unique_ptr<Workspace> &, std::unique_ptr<Workspace> &)>;
+  auto creation_delayed() const -> bool { return creation_delayed_; }
+
+  auto sort_workspaces() -> void;
+  auto remove_workspace_group(uint32_t id_) -> void;
+
+  // wlr stuff
+  auto register_manager(wl_registry *registry, uint32_t name, uint32_t version) -> void;
+  auto handle_workspace_group_create(zext_workspace_group_handle_v1 *workspace_group_handle)
+      -> void;
+  auto handle_done() -> void;
+  auto handle_finished() -> void;
+  auto commit() -> void;
+
+ private:
+  const waybar::Bar                           &bar_;
+  Gtk::Box                                     box_;
+  std::vector<std::unique_ptr<WorkspaceGroup>> groups_;
+
+  // wlr stuff
+  zext_workspace_manager_v1 *workspace_manager_ = nullptr;
+
+  static uint32_t group_global_id;
+
+  bool sort_by_name_ = true;
+  bool sort_by_coordinates_ = true;
+  bool all_outputs_ = false;
+  bool active_only_ = false;
+  bool creation_delayed_ = false;
+};
+
+}  // namespace waybar::modules::wlr

include/modules/wlr/workspace_manager_binding.hpp

@@ -0,0 +1,8 @@
+#include "ext-workspace-unstable-v1-client-protocol.h"
+
+namespace waybar::modules::wlr {
+  void add_registry_listener(void *data);
+  void add_workspace_listener(zext_workspace_handle_v1 *workspace_handle, void *data);
+  void add_workspace_group_listener(zext_workspace_group_handle_v1 *workspace_group_handle, void *data);
+  zext_workspace_manager_v1* workspace_manager_bind(wl_registry *registry, uint32_t name, uint32_t version, void *data);
+}

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-battery.5.scd

@@ -120,7 +120,7 @@ The two arguments are:
 
 # CUSTOM FORMATS
 
-The *battery* module allows to define custom formats based on up to two factors. The best fitting format will be selected.
+The *battery* module allows one to define custom formats based on up to two factors. The best fitting format will be selected.
 
 *format-<state>*: With *states*, a custom format can be set depending on the capacity of your battery.
 

man/waybar-river-tags.5.scd

@@ -21,6 +21,11 @@ Addressed by *river/tags*
     typeof: array ++
     The label to display for each tag.
 
+*disable-click*: ++
+   typeof: bool ++
+   default: false ++
+   If set to false, you can left click to set focused tag. Right click to toggle tag focus. If set to true this behaviour is disabled.
+
 # EXAMPLE
 
 ```

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-wlr-taskbar.5.scd

@@ -70,7 +70,7 @@ Addressed by *wlr/taskbar*
 
 *ignore-list*: ++
 	typeof: array ++
-	List of app_id to be invisible.
+	List of app_id/titles to be invisible.
 
 # FORMAT REPLACEMENTS
 

man/waybar-wlr-workspaces.5.scd

@@ -0,0 +1,87 @@
+waybar-wlr-workspaces(5)
+
+# NAME
+
+waybar - wlr workspaces module
+
+# DESCRIPTION
+
+The *workspaces* module displays the currently used workspaces in wayland compositor.
+
+# CONFIGURATION
+
+Addressed by *wlr/workspaces*
+
+*format*: ++
+	typeof: string ++
+	default: {name} ++
+	The format, how information should be displayed.
+
+*format-icons*: ++
+	typeof: array ++
+	Based on the workspace name and state, the corresponding icon gets selected. See *icons*.
+
+*sort-by-name*: ++
+	typeof: bool ++
+	default: true ++
+	Should workspaces be sorted by name.
+
+*sort-by-coordinates*: ++
+	typeof: bool ++
+	default: true ++
+	Should workspaces be sorted by coordinates.
+	Note that if both  *sort-by-name* and *sort-by-coordinates* are true sort by name will be first.
+	If both are false - sort by id will be performed.
+
+*all-outputs*: ++
+	typeof: bool ++
+	default: false ++
+	If set to false workspaces group will be shown only in assigned output. Otherwise all workspace groups are shown.
+
+*active-only*: ++
+	typeof: bool ++
+	default: false ++
+	If set to true only active or urgent workspaces will be shown.
+
+# FORMAT REPLACEMENTS
+
+*{name}*: Name of workspace assigned by compositor
+
+*{icon}*: Icon, as defined in *format-icons*.
+
+# CLICK ACTIONS
+
+*activate*: Switch to workspace.
+*close*: Close the workspace.
+
+# ICONS
+
+Additional to workspace name matching, the following *format-icons* can be set.
+
+- *default*: Will be shown, when no string match is found.
+- *focused*: Will be shown, when workspace is focused
+
+# EXAMPLES
+
+```
+"wlr/workspaces": {
+	"format": "{name}: {icon}",
+	"format-icons": {
+		"1": "",
+		"2": "",
+		"3": "",
+		"4": "",
+		"5": "",
+		"focused": "",
+		"default": ""
+	}
+}
+```
+
+# Style
+
+- *#workspaces*
+- *#workspaces button*
+- *#workspaces button.active*
+- *#workspaces button.urgent*
+- *#workspaces button.hidden*

man/waybar.5.scd.in

@@ -64,18 +64,27 @@ Also a minimal example configuration can be found on the at the bottom of this m
 	typeof: integer ++
 	Margins value without units.
 
+*spacing* ++
+	typeof: integer ++
+	Size of gaps in between of the different modules.
+
 *name* ++
 	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.
 
@@ -85,6 +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.
@@ -199,6 +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)*
@@ -220,5 +261,6 @@ Valid options for the "rotate" property are: 0, 90, 180 and 270.
 - *waybar-sway-window(5)*
 - *waybar-sway-workspaces(5)*
 - *waybar-wlr-taskbar(5)*
+- *waybar-wlr-workspaces(5)*
 - *waybar-temperature(5)*
 - *waybar-tray(5)*

meson.build

@@ -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',
@@ -186,6 +188,8 @@ src_files += [
 if true
     add_project_arguments('-DHAVE_WLR', language: 'cpp')
     src_files += 'src/modules/wlr/taskbar.cpp'
+    src_files += 'src/modules/wlr/workspace_manager.cpp'
+    src_files += 'src/modules/wlr/workspace_manager_binding.cpp'
 endif
 
 if true
@@ -255,6 +259,10 @@ else
     src_files += 'src/modules/simpleclock.cpp'
 endif
 
+if get_option('experimental')
+    add_project_arguments('-DUSE_EXPERIMENTAL', language: 'cpp')
+endif
+
 subdir('protocol')
 
 executable(
@@ -334,6 +342,7 @@ if scdoc.found()
         'waybar-tray.5.scd',
         'waybar-states.5.scd',
         'waybar-wlr-taskbar.5.scd',
+        'waybar-wlr-workspaces.5.scd',
         'waybar-bluetooth.5.scd',
         'waybar-sndio.5.scd',
     ]
@@ -380,3 +389,4 @@ if clangtidy.found()
             '-p', meson.build_root()
         ] + src_files)
 endif
+

meson_options.txt

@@ -11,3 +11,4 @@ option('gtk-layer-shell', type: 'feature', value: 'auto', description: 'Use gtk-
 option('rfkill', type: 'feature', value: 'auto', description: 'Enable support for RFKILL')
 option('sndio', type: 'feature', value: 'auto', description: 'Enable support for sndio')
 option('tests', type: 'feature', value: 'auto', description: 'Enable tests')
+option('experimental', type : 'boolean', value : false, description: 'Enable experimental features')

protocol/ext-workspace-unstable-v1.xml

@@ -0,0 +1,306 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="ext_workspace_unstable_v1">
+  <copyright>
+    Copyright © 2019 Christopher Billington
+    Copyright © 2020 Ilia Bozhinov
+
+    Permission to use, copy, modify, distribute, and sell this
+    software and its documentation for any purpose is hereby granted
+    without fee, provided that the above copyright notice appear in
+    all copies and that both that copyright notice and this permission
+    notice appear in supporting documentation, and that the name of
+    the copyright holders not be used in advertising or publicity
+    pertaining to distribution of the software without specific,
+    written prior permission.  The copyright holders make no
+    representations about the suitability of this software for any
+    purpose.  It is provided "as is" without express or implied
+    warranty.
+
+    THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+    SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+    FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+    ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+    THIS SOFTWARE.
+  </copyright>
+
+  <interface name="zext_workspace_manager_v1" version="1">
+    <description summary="list and control workspaces">
+      Workspaces, also called virtual desktops, are groups of surfaces. A
+      compositor with a concept of workspaces may only show some such groups of
+      surfaces (those of 'active' workspaces) at a time. 'Activating' a
+      workspace is a request for the compositor to display that workspace's
+      surfaces as normal, whereas the compositor may hide or otherwise
+      de-emphasise surfaces that are associated only with 'inactive' workspaces.
+      Workspaces are grouped by which sets of outputs they correspond to, and
+      may contain surfaces only from those outputs. In this way, it is possible
+      for each output to have its own set of workspaces, or for all outputs (or
+      any other arbitrary grouping) to share workspaces. Compositors may
+      optionally conceptually arrange each group of workspaces in an
+      N-dimensional grid.
+
+      The purpose of this protocol is to enable the creation of taskbars and
+      docks by providing them with a list of workspaces and their properties,
+      and allowing them to activate and deactivate workspaces.
+
+      After a client binds the zext_workspace_manager_v1, each workspace will be
+      sent via the workspace event.
+    </description>
+
+    <event name="workspace_group">
+      <description summary="a workspace group has been created">
+        This event is emitted whenever a new workspace group has been created.
+
+        All initial details of the workspace group (workspaces, outputs) will be
+        sent immediately after this event via the corresponding events in
+        zext_workspace_group_handle_v1.
+      </description>
+      <arg name="workspace_group" type="new_id" interface="zext_workspace_group_handle_v1"/>
+    </event>
+
+    <request name="commit">
+      <description summary="all requests about the workspaces have been sent">
+        The client must send this request after it has finished sending other
+        requests. The compositor must process a series of requests preceding a
+        commit request atomically.
+
+        This allows changes to the workspace properties to be seen as atomic,
+        even if they happen via multiple events, and even if they involve
+        multiple zext_workspace_handle_v1 objects, for example, deactivating one
+        workspace and activating another.
+      </description>
+    </request>
+
+    <event name="done">
+      <description summary="all information about the workspace groups has been sent">
+        This event is sent after all changes in all workspace groups have been
+        sent.
+
+        This allows changes to one or more zext_workspace_group_handle_v1
+        properties to be seen as atomic, even if they happen via multiple
+        events. In particular, an output moving from one workspace group to
+        another sends an output_enter event and an output_leave event to the two
+        zext_workspace_group_handle_v1 objects in question. The compositor sends
+        the done event only after updating the output information in both
+        workspace groups.
+      </description>
+    </event>
+
+    <event name="finished">
+      <description summary="the compositor has finished with the workspace_manager">
+        This event indicates that the compositor is done sending events to the
+        zext_workspace_manager_v1. The server will destroy the object
+        immediately after sending this request, so it will become invalid and
+        the client should free any resources associated with it.
+      </description>
+    </event>
+
+    <request name="stop">
+      <description summary="stop sending events">
+        Indicates the client no longer wishes to receive events for new
+        workspace groups. However the compositor may emit further workspace
+        events, until the finished event is emitted.
+
+        The client must not send any more requests after this one.
+      </description>
+    </request>
+  </interface>
+
+  <interface name="zext_workspace_group_handle_v1" version="1">
+    <description summary="a workspace group assigned to a set of outputs">
+      A zext_workspace_group_handle_v1 object represents a a workspace group
+      that is assigned a set of outputs and contains a number of workspaces.
+
+      The set of outputs assigned to the workspace group is conveyed to the client via
+      output_enter and output_leave events, and its workspaces are conveyed with
+      workspace events.
+
+      For example, a compositor which has a set of workspaces for each output may
+      advertise a workspace group (and its workspaces) per output, whereas a compositor
+      where a workspace spans all outputs may advertise a single workspace group for all
+      outputs.
+    </description>
+
+    <event name="output_enter">
+      <description summary="output assigned to workspace group">
+        This event is emitted whenever an output is assigned to the workspace
+        group.
+      </description>
+      <arg name="output" type="object" interface="wl_output"/>
+    </event>
+
+    <event name="output_leave">
+      <description summary="output removed from workspace group">
+        This event is emitted whenever an output is removed from the workspace
+        group.
+      </description>
+      <arg name="output" type="object" interface="wl_output"/>
+    </event>
+
+    <event name="workspace">
+      <description summary="workspace added to workspace group">
+        This event is emitted whenever a new workspace has been created.
+
+        All initial details of the workspace (name, coordinates, state) will
+        be sent immediately after this event via the corresponding events in
+        zext_workspace_handle_v1.
+      </description>
+      <arg name="workspace" type="new_id" interface="zext_workspace_handle_v1"/>
+    </event>
+
+    <event name="remove">
+      <description summary="this workspace group has been destroyed">
+        This event means the zext_workspace_group_handle_v1 has been destroyed.
+        It is guaranteed there won't be any more events for this
+        zext_workspace_group_handle_v1. The zext_workspace_group_handle_v1 becomes
+        inert so any requests will be ignored except the destroy request.
+
+        The compositor must remove all workspaces belonging to a workspace group
+        before removing the workspace group.
+      </description>
+    </event>
+
+    <request name="create_workspace">
+      <description summary="create a new workspace">
+        Request that the compositor create a new workspace with the given name.
+
+        There is no guarantee that the compositor will create a new workspace,
+        or that the created workspace will have the provided name.
+      </description>
+      <arg name="workspace" type="string"/>
+    </request>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the zext_workspace_handle_v1 object">
+        Destroys the zext_workspace_handle_v1 object.
+
+        This request should be called either when the client does not want to
+        use the workspace object any more or after the remove event to finalize
+        the destruction of the object.
+      </description>
+    </request>
+  </interface>
+
+  <interface name="zext_workspace_handle_v1" version="1">
+    <description summary="a workspace handing a group of surfaces">
+      A zext_workspace_handle_v1 object represents a a workspace that handles a
+      group of surfaces.
+
+      Each workspace has a name, conveyed to the client with the name event; a
+      list of states, conveyed to the client with the state event; and
+      optionally a set of coordinates, conveyed to the client with the
+      coordinates event. The client may request that the compositor activate or
+      deactivate the workspace.
+
+      Each workspace can belong to only a single workspace group.
+      Depepending on the compositor policy, there might be workspaces with
+      the same name in different workspace groups, but these workspaces are still
+      separate (e.g. one of them might be active while the other is not).
+    </description>
+
+    <event name="name">
+      <description summary="workspace name changed">
+        This event is emitted immediately after the zext_workspace_handle_v1 is
+        created and whenever the name of the workspace changes.
+      </description>
+      <arg name="name" type="string"/>
+    </event>
+
+    <event name="coordinates">
+      <description summary="workspace coordinates changed">
+        This event is used to organize workspaces into an N-dimensional grid
+        within a workspace group, and if supported, is emitted immediately after
+        the zext_workspace_handle_v1 is created and whenever the coordinates of
+        the workspace change. Compositors may not send this event if they do not
+        conceptually arrange workspaces in this way. If compositors simply
+        number workspaces, without any geometric interpretation, they may send
+        1D coordinates, which clients should not interpret as implying any
+        geometry. Sending an empty array means that the compositor no longer
+        orders the workspace geometrically.
+
+        Coordinates have an arbitrary number of dimensions N with an uint32
+        position along each dimension. By convention if N > 1, the first
+        dimension is X, the second Y, the third Z, and so on. The compositor may
+        chose to utilize these events for a more novel workspace layout
+        convention, however. No guarantee is made about the grid being filled or
+        bounded; there may be a workspace at coordinate 1 and another at
+        coordinate 1000 and none in between. Within a workspace group, however,
+        workspaces must have unique coordinates of equal dimensionality.
+      </description>
+      <arg name="coordinates" type="array"/>
+    </event>
+
+    <event name="state">
+      <description summary="the state of the workspace changed">
+        This event is emitted immediately after the zext_workspace_handle_v1 is
+        created and each time the workspace state changes, either because of a
+        compositor action or because of a request in this protocol.
+      </description>
+      <arg name="state" type="array"/>
+    </event>
+
+    <enum name="state">
+      <description summary="types of states on the workspace">
+        The different states that a workspace can have.
+      </description>
+
+      <entry name="active" value="0" summary="the workspace is active"/>
+      <entry name="urgent" value="1" summary="the workspace requests attention"/>
+      <entry name="hidden" value="2">
+        <description summary="the workspace is not visible">
+          The workspace is not visible in its workspace group, and clients
+          attempting to visualize the compositor workspace state should not
+          display such workspaces.
+        </description>
+      </entry>
+    </enum>
+
+    <event name="remove">
+      <description summary="this workspace has been destroyed">
+        This event means the zext_workspace_handle_v1 has been destroyed. It is
+        guaranteed there won't be any more events for this
+        zext_workspace_handle_v1. The zext_workspace_handle_v1 becomes inert so
+        any requests will be ignored except the destroy request.
+      </description>
+    </event>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the zext_workspace_handle_v1 object">
+        Destroys the zext_workspace_handle_v1 object.
+
+        This request should be called either when the client does not want to
+        use the workspace object any more or after the remove event to finalize
+        the destruction of the object.
+      </description>
+    </request>
+
+    <request name="activate">
+      <description summary="activate the workspace">
+        Request that this workspace be activated.
+
+        There is no guarantee the workspace will be actually activated, and
+        behaviour may be compositor-dependent. For example, activating a
+        workspace may or may not deactivate all other workspaces in the same
+        group.
+      </description>
+    </request>
+
+    <request name="deactivate">
+      <description summary="activate the workspace">
+        Request that this workspace be deactivated.
+
+        There is no guarantee the workspace will be actually deactivated.
+      </description>
+    </request>
+
+    <request name="remove">
+      <description summary="remove the workspace">
+        Request that this workspace be removed.
+
+        There is no guarantee the workspace will be actually removed.
+      </description>
+    </request>
+  </interface>
+</protocol>

protocol/meson.build

@@ -27,7 +27,9 @@ client_protocols = [
 	[wl_protocol_dir, 'unstable/idle-inhibit/idle-inhibit-unstable-v1.xml'],
 	['wlr-layer-shell-unstable-v1.xml'],
 	['wlr-foreign-toplevel-management-unstable-v1.xml'],
+	['ext-workspace-unstable-v1.xml'],
 	['river-status-unstable-v1.xml'],
+	['river-control-unstable-v1.xml'],
 ]
 
 client_protos_src = []

protocol/river-control-unstable-v1.xml

@@ -0,0 +1,85 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="river_control_unstable_v1">
+  <copyright>
+    Copyright 2020 The River Developers
+
+    Permission to use, copy, modify, and/or distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+  </copyright>
+
+  <interface name="zriver_control_v1" version="1">
+    <description summary="run compositor commands">
+      This interface allows clients to run compositor commands and receive a
+      success/failure response with output or a failure message respectively.
+
+      Each command is built up in a series of add_argument requests and
+      executed with a run_command request. The first argument is the command
+      to be run.
+
+      A complete list of commands should be made available in the man page of
+      the compositor.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy the river_control object">
+        This request indicates that the client will not use the
+        river_control object any more. Objects that have been created
+        through this instance are not affected.
+      </description>
+    </request>
+
+    <request name="add_argument">
+      <description summary="add an argument to the current command">
+        Arguments are stored by the server in the order they were sent until
+        the run_command request is made.
+      </description>
+      <arg name="argument" type="string" summary="the argument to add"/>
+    </request>
+
+    <request name="run_command">
+      <description summary="run the current command">
+        Execute the command built up using the add_argument request for the
+        given seat.
+      </description>
+      <arg name="seat" type="object" interface="wl_seat"/>
+      <arg name="callback" type="new_id" interface="zriver_command_callback_v1"
+        summary="callback object"/>
+    </request>
+  </interface>
+
+  <interface name="zriver_command_callback_v1" version="1">
+    <description summary="callback object">
+      This object is created by the run_command request. Exactly one of the
+      success or failure events will be sent. This object will be destroyed
+      by the compositor after one of the events is sent.
+    </description>
+
+    <event name="success">
+      <description summary="command successful">
+        Sent when the command has been successfully received and executed by
+        the compositor. Some commands may produce output, in which case the
+        output argument will be a non-empty string.
+      </description>
+      <arg name="output" type="string" summary="the output of the command"/>
+    </event>
+
+    <event name="failure">
+      <description summary="command failed">
+        Sent when the command could not be carried out. This could be due to
+        sending a non-existent command, no command, not enough arguments, too
+        many arguments, invalid arguments, etc.
+      </description>
+      <arg name="failure_message" type="string"
+        summary="a message explaining why failure occurred"/>
+    </event>
+  </interface>
+</protocol>

resources/config

@@ -3,6 +3,7 @@
     // "position": "bottom", // Waybar position (top|bottom|left|right)
     "height": 30, // Waybar height (to be removed for auto height)
     // "width": 1280, // Waybar width
+    "spacing": 4, // Gaps between modules (4px)
     // Choose the order of the modules
     "modules-left": ["sway/workspaces", "sway/mode", "custom/media"],
     "modules-center": ["sway/window"],

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:

resources/style.css

@@ -80,7 +80,6 @@ window#waybar.chromium {
 #idle_inhibitor,
 #mpd {
     padding: 0 10px;
-    margin: 0 4px;
     color: #ffffff;
 }
 

src/ALabel.cpp

@@ -67,8 +67,10 @@ std::string ALabel::getIcon(uint16_t percentage, const std::string& alt, uint16_
   }
   if (format_icons.isArray()) {
     auto size = format_icons.size();
-    auto idx = std::clamp(percentage / ((max == 0 ? 100 : max) / size), 0U, size - 1);
-    format_icons = format_icons[idx];
+    if (size) {
+      auto idx = std::clamp(percentage / ((max == 0 ? 100 : max) / size), 0U, size - 1);
+      format_icons = format_icons[idx];
+    }
   }
   if (format_icons.isString()) {
     return format_icons.asString();
@@ -90,8 +92,10 @@ std::string ALabel::getIcon(uint16_t percentage, const std::vector<std::string>&
   }
   if (format_icons.isArray()) {
     auto size = format_icons.size();
-    auto idx = std::clamp(percentage / ((max == 0 ? 100 : max) / size), 0U, size - 1);
-    format_icons = format_icons[idx];
+    if (size) {
+      auto idx = std::clamp(percentage / ((max == 0 ? 100 : max) / size), 0U, size - 1);
+      format_icons = format_icons[idx];
+    }
   }
   if (format_icons.isString()) {
     return format_icons.asString();

src/bar.cpp

@@ -9,20 +9,103 @@
 #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: {} exceeds the minimum height: {} required by the modules";
+    "Requested height: {} is less than the minimum height: {} required by the modules";
 
 static constexpr const char* MIN_WIDTH_MSG =
-    "Requested width: {} exceeds the minimum width: {} required by the modules";
+    "Requested width: {} is less than the minimum width: {} required by the modules";
 
 static constexpr const char* BAR_SIZE_MSG = "Bar configured (width: {}, height: {}) for output: {}";
 
 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") {
@@ -438,6 +499,13 @@ waybar::Bar::Bar(struct waybar_output* w_output, const Json::Value& w_config)
   center_.get_style_context()->add_class("modules-center");
   right_.get_style_context()->add_class("modules-right");
 
+  if (config["spacing"].isInt()) {
+    int spacing = config["spacing"].asInt();
+    left_.set_spacing(spacing);
+    center_.set_spacing(spacing);
+    right_.set_spacing(spacing);
+  }
+
   uint32_t height = config["height"].isUInt() ? config["height"].asUInt() : 0;
   uint32_t width = config["width"].isUInt() ? config["width"].asUInt() : 0;
 
@@ -498,15 +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();
 
@@ -521,6 +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).
@@ -531,17 +665,7 @@ void waybar::Bar::onMap(GdkEventAny*) {
 
 void waybar::Bar::setVisible(bool value) {
   visible = value;
-  if (!visible) {
-    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();
+  setMode(visible ? MODE_DEFAULT : MODE_INVISIBLE);
 }
 
 void waybar::Bar::toggle() { setVisible(!visible); }
@@ -587,19 +711,7 @@ void waybar::Bar::setupAltFormatKeyForModuleList(const char* module_list_name) {
 }
 
 void waybar::Bar::handleSignal(int signal) {
-  for (auto& module : modules_left_) {
-    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_) {
+  for (auto& module : modules_all_) {
     auto* custom = dynamic_cast<waybar::modules::Custom*>(module.get());
     if (custom != nullptr) {
       custom->refresh(signal);
@@ -607,19 +719,36 @@ void waybar::Bar::handleSignal(int signal) {
   }
 }
 
-void waybar::Bar::getModules(const Factory& factory, const std::string& pos) {
-  if (config[pos].isArray()) {
-    for (const auto& name : config[pos]) {
+void waybar::Bar::getModules(const Factory& factory, const std::string& pos, Gtk::Box* group = nullptr) {
+  auto module_list = group ? config[pos]["modules"] : config[pos];
+  if (module_list.isArray()) {
+    for (const auto& name : module_list) {
       try {
-        auto module = factory.makeModule(name.asString());
-        if (pos == "modules-left") {
-          modules_left_.emplace_back(module);
+        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);
         }
-        if (pos == "modules-center") {
-          modules_center_.emplace_back(module);
-        }
-        if (pos == "modules-right") {
-          modules_right_.emplace_back(module);
+
+        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_sp);
+          }
+          if (pos == "modules-center") {
+            modules_center_.emplace_back(module_sp);
+          }
+          if (pos == "modules-right") {
+            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

@@ -30,6 +30,11 @@ 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") {

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;
-    setTimeZone(config_["timezones"][time_zone_idx_]);
-  } else {
-    setTimeZone(config_["timezone"]);
+    for (const auto& zone_name: config_["timezones"]) {
+      if (!zone_name.isString() || zone_name.asString().empty()) {
+        time_zones_.push_back(nullptr);
+        continue;
+      }
+      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 (fixed_time_zone_) {
+
+  // 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)
   };
 }
 
+const date::time_zone* waybar::modules::Clock::current_timezone() {
+  return time_zones_[current_time_zone_idx_] ? time_zones_[current_time_zone_idx_] : date::current_zone();
+}
+
+bool waybar::modules::Clock::is_timezone_fixed() {
+  return time_zones_[current_time_zone_idx_] != nullptr;
+}
+
 auto waybar::modules::Clock::update() -> void {
-  if (!fixed_time_zone_) {
-    // Time zone can change. Be sure to pick that.
-    time_zone_ = date::current_zone();
-  }
-
-  auto        now = std::chrono::system_clock::now();
+  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))};
-
-  std::string text;
-  if (!fixed_time_zone_) {
+                       date::make_zoned(time_zone, date::floor<std::chrono::seconds>(now))};
+  std::string text = "";
+  if (!is_timezone_fixed()) {
     // 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);
-      auto       tooltip_format = config_["tooltip-format"].asString();
-      auto       tooltip_text = fmt::format(tooltip_format, wtime, fmt::arg("calendar", calendar));
-      label_.set_tooltip_markup(tooltip_text);
-    } else {
-      label_.set_tooltip_markup(text);
+      std::string calendar_lines = "";
+      if (is_calendar_in_tooltip_) {
+        calendar_lines = calendar_text(wtime);
+      }
+      auto tooltip_format = config_["tooltip-format"].asString();
+      text = fmt::format(tooltip_format, wtime, fmt::arg(kCalendarPlaceholder.c_str(), calendar_lines));
     }
   }
+
+  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;
-    time_zone_idx_ = new_idx == nr_zones ? 0 : new_idx;
+    size_t new_idx = current_time_zone_idx_ + 1;
+    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/disk.cpp

@@ -45,9 +45,9 @@ auto waybar::modules::Disk::update() -> void {
   }
 
   auto free = pow_format(stats.f_bavail * stats.f_frsize, "B", true);
-  auto used = pow_format((stats.f_blocks - stats.f_bavail) * stats.f_frsize, "B", true);
+  auto used = pow_format((stats.f_blocks - stats.f_bfree) * stats.f_frsize, "B", true);
   auto total = pow_format(stats.f_blocks * stats.f_frsize, "B", true);
-  auto percentage_used = (stats.f_blocks - stats.f_bavail) * 100 / stats.f_blocks;
+  auto percentage_used = (stats.f_blocks - stats.f_bfree) * 100 / stats.f_blocks;
 
   auto format = format_;
   auto state = getState(percentage_used);

src/modules/memory/common.cpp

@@ -15,11 +15,11 @@ auto waybar::modules::Memory::update() -> void {
   unsigned long memfree;
   if (meminfo_.count("MemAvailable")) {
     // New kernels (3.4+) have an accurate available memory field.
-    memfree = meminfo_["MemAvailable"];
+    memfree = meminfo_["MemAvailable"] + meminfo_["zfs_size"];
   } else {
     // Old kernel; give a best-effort approximation of available memory.
     memfree = meminfo_["MemFree"] + meminfo_["Buffers"] + meminfo_["Cached"] +
-              meminfo_["SReclaimable"] - meminfo_["Shmem"];
+              meminfo_["SReclaimable"] - meminfo_["Shmem"] + meminfo_["zfs_size"];
   }
 
   if (memtotal > 0 && memfree >= 0) {

src/modules/memory/linux.cpp

@@ -1,8 +1,29 @@
 #include "modules/memory.hpp"
 
+static unsigned zfsArcSize() {
+  std::ifstream zfs_arc_stats{"/proc/spl/kstat/zfs/arcstats"};
+
+  if (zfs_arc_stats.is_open()) {
+    std::string   name;
+    std::string   type;
+    unsigned long data{0};
+
+    std::string line;
+    while (std::getline(zfs_arc_stats, line)) {
+      std::stringstream(line) >> name >> type >> data;
+
+      if (name == "size") {
+        return data / 1024;  // convert to kB
+      }
+    }
+  }
+
+  return 0;
+}
+
 void waybar::modules::Memory::parseMeminfo() {
   const std::string data_dir_ = "/proc/meminfo";
-  std::ifstream info(data_dir_);
+  std::ifstream     info(data_dir_);
   if (!info.is_open()) {
     throw std::runtime_error("Can't open " + data_dir_);
   }
@@ -17,4 +38,6 @@ void waybar::modules::Memory::parseMeminfo() {
     int64_t     value = std::stol(line.substr(posDelim + 1));
     meminfo_[name] = value;
   }
+
+  meminfo_["zfs_size"] = zfsArcSize();
 }

src/modules/mpd/mpd.cpp

@@ -131,6 +131,9 @@ void waybar::modules::MPD::setLabel() {
     date = getTag(MPD_TAG_DATE);
     song_pos = mpd_status_get_song_pos(status_.get());
     volume = mpd_status_get_volume(status_.get());
+    if (volume < 0) {
+      volume = 0;
+    }
     queue_length = mpd_status_get_queue_length(status_.get());
     elapsedTime = std::chrono::seconds(mpd_status_get_elapsed_time(status_.get()));
     totalTime = std::chrono::seconds(mpd_status_get_total_time(status_.get()));

src/modules/network.cpp

@@ -1,87 +1,77 @@
-#include "modules/network.hpp"
+#include <linux/if.h>
 #include <spdlog/spdlog.h>
 #include <sys/eventfd.h>
-#include <linux/if.h>
-#include <fstream>
+
 #include <cassert>
+#include <fstream>
+#include <sstream>
 #include <optional>
+
+#include "modules/network.hpp"
 #include "util/format.hpp"
 #ifdef WANT_RFKILL
 #include "util/rfkill.hpp"
 #endif
 
 namespace {
-
 using namespace waybar::util;
-
-constexpr const char *NETSTAT_FILE =
-    "/proc/net/netstat";  // std::ifstream does not take std::string_view as param
-constexpr std::string_view BANDWIDTH_CATEGORY = "IpExt";
-constexpr std::string_view BANDWIDTH_DOWN_TOTAL_KEY = "InOctets";
-constexpr std::string_view BANDWIDTH_UP_TOTAL_KEY = "OutOctets";
 constexpr const char *DEFAULT_FORMAT = "{ifname}";
-
-std::ifstream                     netstat(NETSTAT_FILE);
-std::optional<unsigned long long> read_netstat(std::string_view category, std::string_view key) {
-  if (!netstat) {
-    spdlog::warn("Failed to open netstat file {}", NETSTAT_FILE);
-    return {};
-  }
-  netstat.seekg(std::ios_base::beg);
-
-  // finding corresponding line (category)
-  // looks into the file for the first line starting by the 'category' string
-  auto starts_with = [](const std::string &str, std::string_view start) {
-    return start == std::string_view{str.data(), std::min(str.size(), start.size())};
-  };
-
-  std::string read;
-  while (std::getline(netstat, read) && !starts_with(read, category))
-    ;
-  if (!starts_with(read, category)) {
-    spdlog::warn("Category '{}' not found in netstat file {}", category, NETSTAT_FILE);
-    return {};
-  }
-
-  // finding corresponding column (key)
-  // looks into the fetched line for the first word (space separated) equal to 'key'
-  int  index = 0;
-  auto r_it = read.begin();
-  auto k_it = key.begin();
-  while (k_it != key.end() && r_it != read.end()) {
-    if (*r_it != *k_it) {
-      r_it = std::find(r_it, read.end(), ' ');
-      if (r_it != read.end()) {
-        ++r_it;
-      }
-      k_it = key.begin();
-      ++index;
-    } else {
-      ++r_it;
-      ++k_it;
-    }
-  }
-
-  if (r_it == read.end() && k_it != key.end()) {
-    spdlog::warn(
-        "Key '{}' not found in category '{}' of netstat file {}", key, category, NETSTAT_FILE);
-    return {};
-  }
-
-  // finally accessing value
-  // accesses the line right under the fetched one
-  std::getline(netstat, read);
-  assert(starts_with(read, category));
-  std::istringstream iss(read);
-  while (index--) {
-    std::getline(iss, read, ' ');
-  }
-  unsigned long long value;
-  iss >> value;
-  return value;
-}
 }  // namespace
 
+constexpr const char *NETDEV_FILE =
+    "/proc/net/dev";  // std::ifstream does not take std::string_view as param
+std::optional<std::pair<unsigned long long, unsigned long long>>
+waybar::modules::Network::readBandwidthUsage() {
+  std::ifstream netdev(NETDEV_FILE);
+  if (!netdev) {
+    spdlog::warn("Failed to open netdev file {}", NETDEV_FILE);
+    return {};
+  }
+
+  std::string line;
+  // skip the headers (first two lines)
+  std::getline(netdev, line);
+  std::getline(netdev, line);
+
+  unsigned long long receivedBytes = 0ull;
+  unsigned long long transmittedBytes = 0ull;
+  while (std::getline(netdev, line)) {
+    std::istringstream iss(line);
+
+    std::string ifacename;
+    iss >> ifacename;  // ifacename contains "eth0:"
+    ifacename.pop_back();  // remove trailing ':'
+    if (!checkInterface(ifacename)) {
+      continue;
+    }
+
+    // The rest of the line consists of whitespace separated counts divided
+    // into two groups (receive and transmit). Each group has the following
+    // columns: bytes, packets, errs, drop, fifo, frame, compressed, multicast
+    //
+    // We only care about the bytes count, so we'll just ignore the 7 other
+    // columns.
+    unsigned long long r = 0ull;
+    unsigned long long t = 0ull;
+    // Read received bytes
+    iss >> r;
+    // Skip all the other columns in the received group
+    for (int colsToSkip = 7; colsToSkip > 0; colsToSkip--) {
+      // skip whitespace between columns
+      while (iss.peek() == ' ') { iss.ignore(); }
+      // skip the irrelevant column
+      while (iss.peek() != ' ') { iss.ignore(); }
+    }
+    // Read transmit bytes
+    iss >> t;
+
+    receivedBytes += r;
+    transmittedBytes += t;
+  }
+
+  return {{receivedBytes, transmittedBytes}};
+}
+
 waybar::modules::Network::Network(const std::string &id, const Json::Value &config)
     : ALabel(config, "network", id, DEFAULT_FORMAT, 60),
       ifid_(-1),
@@ -106,17 +96,12 @@ waybar::modules::Network::Network(const std::string &id, const Json::Value &conf
   // the module start with no text, but the the event_box_ is shown.
   label_.set_markup("<s></s>");
 
-  auto down_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_DOWN_TOTAL_KEY);
-  auto up_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_UP_TOTAL_KEY);
-  if (down_octets) {
-    bandwidth_down_total_ = *down_octets;
+  auto bandwidth = readBandwidthUsage();
+  if (bandwidth.has_value()) {
+    bandwidth_down_total_ = (*bandwidth).first;
+    bandwidth_up_total_ = (*bandwidth).second;
   } else {
     bandwidth_down_total_ = 0;
-  }
-
-  if (up_octets) {
-    bandwidth_up_total_ = *up_octets;
-  } else {
     bandwidth_up_total_ = 0;
   }
 
@@ -303,20 +288,21 @@ const std::string waybar::modules::Network::getNetworkState() const {
 auto waybar::modules::Network::update() -> void {
   std::lock_guard<std::mutex> lock(mutex_);
   std::string                 tooltip_format;
-  auto down_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_DOWN_TOTAL_KEY);
-  auto up_octets = read_netstat(BANDWIDTH_CATEGORY, BANDWIDTH_UP_TOTAL_KEY);
 
-  unsigned long long bandwidth_down = 0;
-  if (down_octets) {
-    bandwidth_down = *down_octets - bandwidth_down_total_;
-    bandwidth_down_total_ = *down_octets;
+  auto bandwidth = readBandwidthUsage();
+  auto bandwidth_down = 0ull;
+  auto bandwidth_up = 0ull;
+  if (bandwidth.has_value()) {
+    auto down_octets = (*bandwidth).first;
+    auto up_octets = (*bandwidth).second;
+
+    bandwidth_down = down_octets - bandwidth_down_total_;
+    bandwidth_down_total_ = down_octets;
+
+    bandwidth_up = up_octets - bandwidth_up_total_;
+    bandwidth_up_total_ = up_octets;
   }
 
-  unsigned long long bandwidth_up = 0;
-  if (up_octets) {
-    bandwidth_up = *up_octets - bandwidth_up_total_;
-    bandwidth_up_total_ = *up_octets;
-  }
   if (!alt_) {
     auto state = getNetworkState();
     if (!state_.empty() && label_.get_style_context()->has_class(state_)) {

src/modules/pulseaudio.cpp

@@ -218,7 +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/river/tags.cpp

@@ -7,7 +7,6 @@
 
 #include "client.hpp"
 #include "modules/river/tags.hpp"
-#include "river-status-unstable-v1-client-protocol.h"
 #include "xdg-output-unstable-v1-client-protocol.h"
 
 namespace waybar::modules::river {
@@ -33,6 +32,23 @@ static const zriver_output_status_v1_listener output_status_listener_impl{
     .urgent_tags = listen_urgent_tags,
 };
 
+static void listen_command_success(void *data,
+                                   struct zriver_command_callback_v1 *zriver_command_callback_v1,
+                                   const char *output) {
+  // Do nothing but keep listener to avoid crashing when command was successful
+}
+
+static void listen_command_failure(void *data,
+                                   struct zriver_command_callback_v1 *zriver_command_callback_v1,
+                                   const char *output) {
+  spdlog::error("failure when selecting/toggling tags {}", output);
+}
+
+static const zriver_command_callback_v1_listener command_callback_listener_impl {
+    .success = listen_command_success,
+    .failure = listen_command_failure,
+};
+
 static void handle_global(void *data, struct wl_registry *registry, uint32_t name,
                           const char *interface, uint32_t version) {
   if (std::strcmp(interface, zriver_status_manager_v1_interface.name) == 0) {
@@ -43,18 +59,33 @@ static void handle_global(void *data, struct wl_registry *registry, uint32_t nam
     static_cast<Tags *>(data)->status_manager_ = static_cast<struct zriver_status_manager_v1 *>(
         wl_registry_bind(registry, name, &zriver_status_manager_v1_interface, version));
   }
+
+  if (std::strcmp(interface, zriver_control_v1_interface.name) == 0) {
+    version = std::min<uint32_t>(version, 1);
+    static_cast<Tags *>(data)->control_ = static_cast<struct zriver_control_v1 *>(
+        wl_registry_bind(registry, name, &zriver_control_v1_interface, version));
+  }
+
+  if (std::strcmp(interface, wl_seat_interface.name) == 0) {
+    version = std::min<uint32_t>(version, 1);
+    static_cast<Tags *>(data)->seat_ = static_cast<struct wl_seat *>(
+        wl_registry_bind(registry, name, &wl_seat_interface, version));
+  }
 }
 
 static void handle_global_remove(void *data, struct wl_registry *registry, uint32_t name) {
   /* Ignore event */
 }
 
+
 static const wl_registry_listener registry_listener_impl = {.global = handle_global,
                                                             .global_remove = handle_global_remove};
 
 Tags::Tags(const std::string &id, const waybar::Bar &bar, const Json::Value &config)
     : waybar::AModule(config, "tags", id, false, false),
       status_manager_{nullptr},
+      control_{nullptr},
+      seat_{nullptr},
       bar_(bar),
       box_{bar.vertical ? Gtk::ORIENTATION_VERTICAL : Gtk::ORIENTATION_HORIZONTAL, 0},
       output_status_{nullptr} {
@@ -68,6 +99,14 @@ Tags::Tags(const std::string &id, const waybar::Bar &bar, const Json::Value &con
     return;
   }
 
+  if (!control_) {
+    spdlog::error("river_control_v1 not advertised");
+  }
+
+  if (!seat_) {
+    spdlog::error("wl_seat not advertised");
+  }
+
   box_.set_name("tags");
   if (!id.empty()) {
     box_.get_style_context()->add_class(id);
@@ -89,11 +128,17 @@ Tags::Tags(const std::string &id, const waybar::Bar &bar, const Json::Value &con
     }
   }
 
+  uint32_t i = 1;
   for (const auto &tag_label : tag_labels) {
     Gtk::Button &button = buttons_.emplace_back(tag_label);
     button.set_relief(Gtk::RELIEF_NONE);
     box_.pack_start(button, false, false, 0);
+    if (!config_["disable-click"].asBool()) {
+      button.signal_clicked().connect(sigc::bind(sigc::mem_fun(*this, &Tags::handle_primary_clicked), i));
+      button.signal_button_press_event().connect(sigc::bind(sigc::mem_fun(*this, &Tags::handle_button_press), i));
+    }
     button.show();
+    i <<= 1;
   }
 
   struct wl_output *output = gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj());
@@ -107,6 +152,31 @@ Tags::~Tags() {
   if (output_status_) {
     zriver_output_status_v1_destroy(output_status_);
   }
+
+  if (control_) {
+    zriver_control_v1_destroy(control_);
+  }
+}
+
+void Tags::handle_primary_clicked(uint32_t tag) {
+  // Send river command to select tag on left mouse click
+  zriver_command_callback_v1 *callback;
+  zriver_control_v1_add_argument(control_, "set-focused-tags");
+  zriver_control_v1_add_argument(control_, std::to_string(tag).c_str());
+  callback = zriver_control_v1_run_command(control_, seat_);
+  zriver_command_callback_v1_add_listener(callback, &command_callback_listener_impl, nullptr);
+}
+
+bool Tags::handle_button_press(GdkEventButton *event_button, uint32_t tag) {
+  if (event_button->type == GDK_BUTTON_PRESS && event_button->button == 3) {
+    // Send river command to toggle tag on right mouse click
+    zriver_command_callback_v1 *callback;
+    zriver_control_v1_add_argument(control_, "toggle-focused-tags");
+    zriver_control_v1_add_argument(control_, std::to_string(tag).c_str());
+    callback = zriver_control_v1_run_command(control_, seat_);
+    zriver_command_callback_v1_add_listener(callback, &command_callback_listener_impl, nullptr);
+  }
+  return true;
 }
 
 void Tags::handle_focused_tags(uint32_t tags) {

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

src/modules/wlr/taskbar.cpp

@@ -276,8 +276,7 @@ Task::Task(const waybar::Bar &bar, const Json::Value &config, Taskbar *tbar,
         struct zwlr_foreign_toplevel_handle_v1 *tl_handle, struct wl_seat *seat) :
     bar_{bar}, config_{config}, tbar_{tbar}, handle_{tl_handle}, seat_{seat},
     id_{global_id++},
-    content_{bar.vertical ? Gtk::ORIENTATION_VERTICAL : Gtk::ORIENTATION_HORIZONTAL, 0},
-    button_visible_{false}, ignored_{false}
+    content_{bar.vertical ? Gtk::ORIENTATION_VERTICAL : Gtk::ORIENTATION_HORIZONTAL, 0}
 {
     zwlr_foreign_toplevel_handle_v1_add_listener(handle_, &toplevel_handle_impl, this);
 
@@ -377,13 +376,12 @@ std::string Task::state_string(bool shortened) const
 void Task::handle_title(const char *title)
 {
     title_ = title;
+    hide_if_ignored();
 }
 
-void Task::handle_app_id(const char *app_id)
+void Task::hide_if_ignored()
 {
-    app_id_ = app_id;
-
-    if (tbar_->ignore_list().count(app_id)) {
+    if (tbar_->ignore_list().count(app_id_) || tbar_->ignore_list().count(title_)) {
         ignored_ = true;
         if (button_visible_) {
           auto output = gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj());
@@ -397,6 +395,12 @@ void Task::handle_app_id(const char *app_id)
           handle_output_enter(output);
         }
     }
+}
+
+void Task::handle_app_id(const char *app_id)
+{
+    app_id_ = app_id;
+    hide_if_ignored();
 
     if (!with_icon_)
         return;
@@ -418,13 +422,13 @@ void Task::handle_app_id(const char *app_id)
 
 void Task::handle_output_enter(struct wl_output *output)
 {
-    spdlog::debug("{} entered output {}", repr(), (void*)output);
-
     if (ignored_) {
       spdlog::debug("{} is ignored", repr());
       return;
     }
 
+    spdlog::debug("{} entered output {}", repr(), (void*)output);
+
     if (!button_visible_ && (tbar_->all_outputs() || tbar_->show_output(output))) {
         /* The task entered the output of the current bar make the button visible */
         tbar_->add_button(button_);

src/modules/wlr/workspace_manager.cpp

@@ -0,0 +1,472 @@
+#include "modules/wlr/workspace_manager.hpp"
+
+#include <gdk/gdkwayland.h>
+#include <gtkmm.h>
+#include <spdlog/spdlog.h>
+
+#include <algorithm>
+#include <iterator>
+#include <vector>
+
+#include "gtkmm/widget.h"
+#include "modules/wlr/workspace_manager_binding.hpp"
+
+namespace waybar::modules::wlr {
+
+uint32_t                           WorkspaceGroup::workspace_global_id = 0;
+uint32_t                           WorkspaceManager::group_global_id = 0;
+std::map<std::string, std::string> Workspace::icons_map_;
+
+WorkspaceManager::WorkspaceManager(const std::string &id, const waybar::Bar &bar,
+                                   const Json::Value &config)
+    : waybar::AModule(config, "workspaces", id, false, false),
+      bar_(bar),
+      box_(bar.vertical ? Gtk::ORIENTATION_VERTICAL : Gtk::ORIENTATION_HORIZONTAL, 0) {
+  auto config_sort_by_name = config_["sort-by-name"];
+  if (config_sort_by_name.isBool()) {
+    sort_by_name_ = config_sort_by_name.asBool();
+  }
+
+  auto config_sort_by_coordinates = config_["sort-by-coordinates"];
+  if (config_sort_by_coordinates.isBool()) {
+    sort_by_coordinates_ = config_sort_by_coordinates.asBool();
+  }
+
+  auto config_all_outputs = config_["all-outputs"];
+  if (config_all_outputs.isBool()) {
+    all_outputs_ = config_all_outputs.asBool();
+  }
+
+  auto config_active_only = config_["active-only"];
+  if (config_active_only.isBool()) {
+    active_only_ = config_active_only.asBool();
+    creation_delayed_ = active_only_;
+  }
+
+  box_.set_name("workspaces");
+  if (!id.empty()) {
+    box_.get_style_context()->add_class(id);
+  }
+  event_box_.add(box_);
+
+  add_registry_listener(this);
+  if (!workspace_manager_) {
+    return;
+  }
+}
+
+auto WorkspaceManager::workspace_comparator() const
+    -> std::function<bool(std::unique_ptr<Workspace> &, std::unique_ptr<Workspace> &)> {
+  return [=](std::unique_ptr<Workspace> &lhs, std::unique_ptr<Workspace> &rhs) {
+    auto is_name_less = lhs->get_name() < rhs->get_name();
+    auto is_name_eq = lhs->get_name() == rhs->get_name();
+    auto is_coords_less = lhs->get_coords() < rhs->get_coords();
+    if (sort_by_name_) {
+      if (sort_by_coordinates_) {
+        return is_name_eq ? is_coords_less : is_name_less;
+      } else {
+        return is_name_less;
+      }
+    }
+
+    if (sort_by_coordinates_) {
+      return is_coords_less;
+    }
+
+    return lhs->id() < rhs->id();
+  };
+}
+
+auto WorkspaceManager::sort_workspaces() -> void {
+  std::vector<std::reference_wrapper<std::unique_ptr<Workspace>>> all_workspaces;
+  for (auto &group : groups_) {
+    auto &group_workspaces = group->workspaces();
+    all_workspaces.reserve(all_workspaces.size() +
+                           std::distance(group_workspaces.begin(), group_workspaces.end()));
+    if (!active_only()) {
+      all_workspaces.insert(all_workspaces.end(), group_workspaces.begin(), group_workspaces.end());
+      continue;
+    }
+
+    for (auto &workspace : group_workspaces) {
+      if (!workspace->is_active()) {
+        continue;
+      }
+
+      all_workspaces.push_back(workspace);
+    }
+  }
+
+  std::sort(all_workspaces.begin(), all_workspaces.end(), workspace_comparator());
+  for (size_t i = 0; i < all_workspaces.size(); ++i) {
+    box_.reorder_child(all_workspaces[i].get()->get_button_ref(), i);
+  }
+}
+
+auto WorkspaceManager::register_manager(wl_registry *registry, uint32_t name, uint32_t version)
+    -> void {
+  if (workspace_manager_) {
+    spdlog::warn("Register workspace manager again although already registered!");
+    return;
+  }
+  if (version != 1) {
+    spdlog::warn("Using different workspace manager protocol version: {}", version);
+  }
+  workspace_manager_ = workspace_manager_bind(registry, name, version, this);
+}
+
+auto WorkspaceManager::handle_workspace_group_create(
+    zext_workspace_group_handle_v1 *workspace_group_handle) -> void {
+  auto new_id = ++group_global_id;
+  groups_.push_back(
+      std::make_unique<WorkspaceGroup>(bar_, box_, config_, *this, workspace_group_handle, new_id));
+  spdlog::debug("Workspace group {} created", new_id);
+}
+
+auto WorkspaceManager::handle_finished() -> void {
+  zext_workspace_manager_v1_destroy(workspace_manager_);
+  workspace_manager_ = nullptr;
+}
+
+auto WorkspaceManager::handle_done() -> void {
+  for (auto &group : groups_) {
+    group->handle_done();
+  }
+  dp.emit();
+}
+
+auto WorkspaceManager::update() -> void {
+  for (auto &group : groups_) {
+    group->update();
+  }
+  if (creation_delayed()) {
+    creation_delayed_ = false;
+    sort_workspaces();
+  }
+  AModule::update();
+}
+
+WorkspaceManager::~WorkspaceManager() {
+  if (!workspace_manager_) {
+    return;
+  }
+
+  zext_workspace_manager_v1_destroy(workspace_manager_);
+  workspace_manager_ = nullptr;
+}
+
+auto WorkspaceManager::remove_workspace_group(uint32_t id) -> void {
+  auto it = std::find_if(groups_.begin(),
+                         groups_.end(),
+                         [id](const std::unique_ptr<WorkspaceGroup> &g) { return g->id() == id; });
+
+  if (it == groups_.end()) {
+    spdlog::warn("Can't find group with id {}", id);
+    return;
+  }
+
+  groups_.erase(it);
+}
+auto WorkspaceManager::commit() -> void { zext_workspace_manager_v1_commit(workspace_manager_); }
+
+WorkspaceGroup::WorkspaceGroup(const Bar &bar, Gtk::Box &box, const Json::Value &config,
+                               WorkspaceManager               &manager,
+                               zext_workspace_group_handle_v1 *workspace_group_handle, uint32_t id)
+    : bar_(bar),
+      box_(box),
+      config_(config),
+      workspace_manager_(manager),
+      workspace_group_handle_(workspace_group_handle),
+      id_(id) {
+  add_workspace_group_listener(workspace_group_handle, this);
+}
+
+auto WorkspaceGroup::active_only() const -> bool { return workspace_manager_.active_only(); }
+auto WorkspaceGroup::creation_delayed() const -> bool {
+  return workspace_manager_.creation_delayed();
+}
+
+auto WorkspaceGroup::add_button(Gtk::Button &button) -> void {
+  box_.pack_start(button, false, false);
+}
+
+WorkspaceGroup::~WorkspaceGroup() {
+  if (!workspace_group_handle_) {
+    return;
+  }
+
+  zext_workspace_group_handle_v1_destroy(workspace_group_handle_);
+  workspace_group_handle_ = nullptr;
+}
+
+auto WorkspaceGroup::handle_workspace_create(zext_workspace_handle_v1 *workspace) -> void {
+  auto new_id = ++workspace_global_id;
+  workspaces_.push_back(std::make_unique<Workspace>(bar_, config_, *this, workspace, new_id));
+  spdlog::debug("Workspace {} created", new_id);
+}
+
+auto WorkspaceGroup::handle_remove() -> void {
+  zext_workspace_group_handle_v1_destroy(workspace_group_handle_);
+  workspace_group_handle_ = nullptr;
+  workspace_manager_.remove_workspace_group(id_);
+}
+
+auto WorkspaceGroup::handle_output_enter(wl_output *output) -> void {
+  spdlog::debug("Output {} assigned to {} group", (void *)output, id_);
+  output_ = output;
+
+  if (!is_visible() || workspace_manager_.creation_delayed()) {
+    return;
+  }
+
+  for (auto &workspace : workspaces_) {
+    add_button(workspace->get_button_ref());
+  }
+}
+
+auto WorkspaceGroup::is_visible() const -> bool {
+  return output_ != nullptr &&
+         (workspace_manager_.all_outputs() ||
+          output_ == gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj()));
+}
+
+auto WorkspaceGroup::handle_output_leave() -> void {
+  spdlog::debug("Output {} remove from {} group", (void *)output_, id_);
+  output_ = nullptr;
+
+  if (output_ != gdk_wayland_monitor_get_wl_output(bar_.output->monitor->gobj())) {
+    return;
+  }
+
+  for (auto &workspace : workspaces_) {
+    remove_button(workspace->get_button_ref());
+  }
+}
+
+auto WorkspaceGroup::update() -> void {
+  for (auto &workspace : workspaces_) {
+    if (workspace_manager_.creation_delayed()) {
+      add_button(workspace->get_button_ref());
+      if (is_visible() && (workspace->is_active() || workspace->is_urgent())) {
+        workspace->show();
+      }
+    }
+
+    workspace->update();
+  }
+}
+
+auto WorkspaceGroup::remove_workspace(uint32_t id) -> void {
+  auto it = std::find_if(workspaces_.begin(),
+                         workspaces_.end(),
+                         [id](const std::unique_ptr<Workspace> &w) { return w->id() == id; });
+
+  if (it == workspaces_.end()) {
+    spdlog::warn("Can't find workspace with id {}", id);
+    return;
+  }
+
+  workspaces_.erase(it);
+}
+
+auto WorkspaceGroup::handle_done() -> void {
+  need_to_sort = false;
+  if (!is_visible()) {
+    return;
+  }
+
+  for (auto &workspace : workspaces_) {
+    workspace->handle_done();
+  }
+
+  if (creation_delayed()) {
+    return;
+  }
+
+  if (!workspace_manager_.all_outputs()) {
+    sort_workspaces();
+  } else {
+    workspace_manager_.sort_workspaces();
+  }
+}
+
+auto WorkspaceGroup::commit() -> void { workspace_manager_.commit(); }
+
+auto WorkspaceGroup::sort_workspaces() -> void {
+  std::sort(workspaces_.begin(), workspaces_.end(), workspace_manager_.workspace_comparator());
+  for (size_t i = 0; i < workspaces_.size(); ++i) {
+    box_.reorder_child(workspaces_[i]->get_button_ref(), i);
+  }
+}
+
+auto WorkspaceGroup::remove_button(Gtk::Button &button) -> void { box_.remove(button); }
+
+Workspace::Workspace(const Bar &bar, const Json::Value &config, WorkspaceGroup &workspace_group,
+                     zext_workspace_handle_v1 *workspace, uint32_t id)
+    : bar_(bar),
+      config_(config),
+      workspace_group_(workspace_group),
+      workspace_handle_(workspace),
+      id_(id) {
+  add_workspace_listener(workspace, this);
+
+  auto config_format = config["format"];
+
+  format_ = config_format.isString() ? config_format.asString() : "{name}";
+  with_icon_ = format_.find("{icon}") != std::string::npos;
+
+  if (with_icon_ && icons_map_.empty()) {
+    auto format_icons = config["format-icons"];
+    for (auto &name : format_icons.getMemberNames()) {
+      icons_map_.emplace(name, format_icons[name].asString());
+    }
+  }
+
+  /* Handle click events if configured */
+  if (config_["on-click"].isString() || config_["on-click-middle"].isString() ||
+      config_["on-click-right"].isString()) {
+    button_.add_events(Gdk::BUTTON_PRESS_MASK);
+    button_.signal_button_press_event().connect(sigc::mem_fun(*this, &Workspace::handle_clicked),
+                                                false);
+  }
+
+  button_.set_relief(Gtk::RELIEF_NONE);
+  content_.set_center_widget(label_);
+  button_.add(content_);
+
+  if (!workspace_group.is_visible()) {
+    return;
+  }
+
+  workspace_group.add_button(button_);
+  button_.show_all();
+}
+
+Workspace::~Workspace() {
+  workspace_group_.remove_button(button_);
+  if (!workspace_handle_) {
+    return;
+  }
+
+  zext_workspace_handle_v1_destroy(workspace_handle_);
+  workspace_handle_ = nullptr;
+}
+
+auto Workspace::update() -> void {
+  label_.set_markup(fmt::format(
+      format_, fmt::arg("name", name_), fmt::arg("icon", with_icon_ ? get_icon() : "")));
+}
+
+auto Workspace::handle_state(const std::vector<uint32_t> &state) -> void {
+  state_ = 0;
+  for (auto state_entry : state) {
+    switch (state_entry) {
+      case ZEXT_WORKSPACE_HANDLE_V1_STATE_ACTIVE:
+        state_ |= (uint32_t)State::ACTIVE;
+        break;
+      case ZEXT_WORKSPACE_HANDLE_V1_STATE_URGENT:
+        state_ |= (uint32_t)State::URGENT;
+        break;
+      case ZEXT_WORKSPACE_HANDLE_V1_STATE_HIDDEN:
+        state_ |= (uint32_t)State::HIDDEN;
+        break;
+    }
+  }
+}
+
+auto Workspace::handle_remove() -> void {
+  zext_workspace_handle_v1_destroy(workspace_handle_);
+  workspace_handle_ = nullptr;
+  workspace_group_.remove_workspace(id_);
+}
+
+auto add_or_remove_class(Glib::RefPtr<Gtk::StyleContext> context, bool condition,
+                         const std::string &class_name) {
+  if (condition) {
+    context->add_class(class_name);
+  } else {
+    context->remove_class(class_name);
+  }
+}
+
+auto Workspace::handle_done() -> void {
+  spdlog::debug("Workspace {} changed to state {}", id_, state_);
+  auto style_context = button_.get_style_context();
+  add_or_remove_class(style_context, is_active(), "active");
+  add_or_remove_class(style_context, is_urgent(), "urgent");
+  add_or_remove_class(style_context, is_hidden(), "hidden");
+
+  if (workspace_group_.creation_delayed()) {
+    return;
+  }
+
+  if (workspace_group_.active_only() && (is_active() || is_urgent())) {
+    button_.show_all();
+  } else if (workspace_group_.active_only() && !(is_active() || is_urgent())) {
+    button_.hide();
+  }
+}
+
+auto Workspace::get_icon() -> std::string {
+  if (is_active()) {
+    auto active_icon_it = icons_map_.find("active");
+    if (active_icon_it != icons_map_.end()) {
+      return active_icon_it->second;
+    }
+  }
+
+  auto named_icon_it = icons_map_.find(name_);
+  if (named_icon_it != icons_map_.end()) {
+    return named_icon_it->second;
+  }
+
+  auto default_icon_it = icons_map_.find("default");
+  if (default_icon_it != icons_map_.end()) {
+    return default_icon_it->second;
+  }
+
+  return name_;
+}
+
+auto Workspace::handle_clicked(GdkEventButton *bt) -> bool {
+  std::string action;
+  if (config_["on-click"].isString() && bt->button == 1) {
+    action = config_["on-click"].asString();
+  } else if (config_["on-click-middle"].isString() && bt->button == 2) {
+    action = config_["on-click-middle"].asString();
+  } else if (config_["on-click-right"].isString() && bt->button == 3) {
+    action = config_["on-click-right"].asString();
+  }
+
+  if (action.empty())
+    return true;
+  else if (action == "activate") {
+    zext_workspace_handle_v1_activate(workspace_handle_);
+  } else if (action == "close") {
+    zext_workspace_handle_v1_remove(workspace_handle_);
+  } else {
+    spdlog::warn("Unknown action {}", action);
+  }
+
+  workspace_group_.commit();
+
+  return true;
+}
+
+auto Workspace::show() -> void { button_.show_all(); }
+auto Workspace::hide() -> void { button_.hide(); }
+
+auto Workspace::handle_name(const std::string &name) -> void {
+  if (name_ != name) {
+    workspace_group_.set_need_to_sort();
+  }
+  name_ = name;
+}
+
+auto Workspace::handle_coordinates(const std::vector<uint32_t> &coordinates) -> void {
+  if (coordinates_ != coordinates) {
+    workspace_group_.set_need_to_sort();
+  }
+  coordinates_ = coordinates;
+}
+}  // namespace waybar::modules::wlr

src/modules/wlr/workspace_manager_binding.cpp

@@ -0,0 +1,135 @@
+#include "modules/wlr/workspace_manager_binding.hpp"
+
+#include <spdlog/spdlog.h>
+#include <cstdint>
+
+#include "client.hpp"
+#include "modules/wlr/workspace_manager.hpp"
+
+namespace waybar::modules::wlr {
+
+static void handle_global(void *data, wl_registry *registry, uint32_t name, const char *interface,
+                          uint32_t version) {
+  if (std::strcmp(interface, zext_workspace_manager_v1_interface.name) == 0) {
+    static_cast<WorkspaceManager *>(data)->register_manager(registry, name, version);
+  }
+}
+
+static void handle_global_remove(void *data, wl_registry *registry, uint32_t name) {
+  /* Nothing to do here */
+}
+
+static const wl_registry_listener registry_listener_impl = {.global = handle_global,
+                                                            .global_remove = handle_global_remove};
+
+void add_registry_listener(void *data) {
+  wl_display * display = Client::inst()->wl_display;
+  wl_registry *registry = wl_display_get_registry(display);
+
+  wl_registry_add_listener(registry, &registry_listener_impl, data);
+  wl_display_roundtrip(display);
+  wl_display_roundtrip(display);
+}
+
+static void workspace_manager_handle_workspace_group(
+    void *data, zext_workspace_manager_v1 *_, zext_workspace_group_handle_v1 *workspace_group) {
+  static_cast<WorkspaceManager *>(data)->handle_workspace_group_create(workspace_group);
+}
+
+static void workspace_manager_handle_done(void *data, zext_workspace_manager_v1 *_) {
+  static_cast<WorkspaceManager *>(data)->handle_done();
+}
+
+static void workspace_manager_handle_finished(void *data, zext_workspace_manager_v1 *_) {
+  static_cast<WorkspaceManager *>(data)->handle_finished();
+}
+
+static const zext_workspace_manager_v1_listener workspace_manager_impl = {
+    .workspace_group = workspace_manager_handle_workspace_group,
+    .done = workspace_manager_handle_done,
+    .finished = workspace_manager_handle_finished,
+};
+
+zext_workspace_manager_v1 *workspace_manager_bind(wl_registry *registry, uint32_t name,
+                                                  uint32_t version, void *data) {
+  auto *workspace_manager = static_cast<zext_workspace_manager_v1 *>(
+      wl_registry_bind(registry, name, &zext_workspace_manager_v1_interface, version));
+
+  if (workspace_manager)
+    zext_workspace_manager_v1_add_listener(workspace_manager, &workspace_manager_impl, data);
+  else
+    spdlog::error("Failed to register manager");
+
+  return workspace_manager;
+}
+
+static void workspace_group_handle_output_enter(void *data, zext_workspace_group_handle_v1 *_,
+                                                wl_output *output) {
+  static_cast<WorkspaceGroup *>(data)->handle_output_enter(output);
+}
+
+static void workspace_group_handle_output_leave(void *data, zext_workspace_group_handle_v1 *_,
+                                                wl_output *output) {
+  static_cast<WorkspaceGroup *>(data)->handle_output_leave();
+}
+
+static void workspace_group_handle_workspace(void *data, zext_workspace_group_handle_v1 *_,
+                                             zext_workspace_handle_v1 *workspace) {
+  static_cast<WorkspaceGroup *>(data)->handle_workspace_create(workspace);
+}
+
+static void workspace_group_handle_remove(void *data, zext_workspace_group_handle_v1 *_) {
+  static_cast<WorkspaceGroup *>(data)->handle_remove();
+}
+
+static const zext_workspace_group_handle_v1_listener workspace_group_impl = {
+    .output_enter = workspace_group_handle_output_enter,
+    .output_leave = workspace_group_handle_output_leave,
+    .workspace = workspace_group_handle_workspace,
+    .remove = workspace_group_handle_remove};
+
+void add_workspace_group_listener(zext_workspace_group_handle_v1 *workspace_group_handle,
+                                  void *                          data) {
+  zext_workspace_group_handle_v1_add_listener(workspace_group_handle, &workspace_group_impl, data);
+}
+
+void workspace_handle_name(void *data, struct zext_workspace_handle_v1 *_, const char *name) {
+  static_cast<Workspace *>(data)->handle_name(name);
+}
+
+void workspace_handle_coordinates(void *data, struct zext_workspace_handle_v1 *_,
+                                  struct wl_array *coordinates) {
+  std::vector<uint32_t> coords_vec;
+  auto                  coords = static_cast<uint32_t *>(coordinates->data);
+  for (size_t i = 0; i < coordinates->size / sizeof(uint32_t); ++i) {
+    coords_vec.push_back(coords[i]);
+  }
+
+  static_cast<Workspace *>(data)->handle_coordinates(coords_vec);
+}
+
+void workspace_handle_state(void *data, struct zext_workspace_handle_v1 *workspace_handle,
+                            struct wl_array *state) {
+  std::vector<uint32_t> state_vec;
+  auto                  states = static_cast<uint32_t *>(state->data);
+  for (size_t i = 0; i < state->size / sizeof(uint32_t); ++i) {
+    state_vec.push_back(states[i]);
+  }
+
+  static_cast<Workspace *>(data)->handle_state(state_vec);
+}
+
+void workspace_handle_remove(void *data, struct zext_workspace_handle_v1 *_) {
+  static_cast<Workspace *>(data)->handle_remove();
+}
+
+static const zext_workspace_handle_v1_listener workspace_impl = {
+    .name = workspace_handle_name,
+    .coordinates = workspace_handle_coordinates,
+    .state = workspace_handle_state,
+    .remove = workspace_handle_remove};
+
+void add_workspace_listener(zext_workspace_handle_v1 *workspace_handle, void *data) {
+  zext_workspace_handle_v1_add_listener(workspace_handle, &workspace_impl, data);
+}
+}  // namespace waybar::modules::wlr

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(),
+)