feat(taskbar): `order-list` option

include/modules/wlr/taskbar.hpp

@@ -46,6 +46,8 @@ class Task
         INVALID = (1 << 4)
     };
 
+    Gtk::Button button_;
+
    private:
     static uint32_t global_id;
 
@@ -58,7 +60,7 @@ class Task
 
     uint32_t id_;
 
-    Gtk::Button button_;
+
     Gtk::Box content_;
     Gtk::Image icon_;
     Gtk::Label text_before_;
@@ -143,6 +145,7 @@ class Taskbar : public waybar::AModule
 
     std::vector<Glib::RefPtr<Gtk::IconTheme>> icon_themes_;
     std::unordered_set<std::string> ignore_list_;
+    std::vector<std::string> order_list_;
     std::map<std::string, std::string> app_ids_replace_map_;
 
     struct zwlr_foreign_toplevel_manager_v1 *manager_;

man/waybar-wlr-taskbar.5.scd

@@ -72,6 +72,10 @@ Addressed by *wlr/taskbar*
 	typeof: array ++
 	List of app_id/titles to be invisible.
 
+*ignore-list*: ++
+	typeof: array ++
+	List of app_ids in the order they should appear.
+
 *app_ids-mapping*: ++
 	typeof: object ++
 	Dictionary of app_id to be replaced with

src/modules/wlr/taskbar.cpp

@@ -764,6 +764,13 @@ Taskbar::Taskbar(const std::string &id, const waybar::Bar &bar, const Json::Valu
         }
     }
 
+    // Load order-list
+    if (config_["order-list"].isArray()) {
+      for (auto& app_name : config_["order-list"]) {
+        order_list_.push_back(app_name.asString());
+      }
+    }
+
     // Load app_id remappings
     if (config_["app_ids-mapping"].isObject()) {
 		const Json::Value& mapping = config_["app_ids-mapping"];
@@ -798,6 +805,18 @@ Taskbar::~Taskbar()
 
 void Taskbar::update()
 {
+  if (!order_list_.empty()) {
+    for (auto& task : tasks_) {
+      auto begin = order_list_.begin();
+      auto itr = std::find(begin, order_list_.end(), task->app_id());
+
+      if (itr != std::end(order_list_)) {
+        auto index = std::distance(begin, itr);
+        move_button(task->button_, index);
+      }
+    }
+  }
+
   for (auto& t : tasks_) {
         t->update();
     }