feat(sway): add focused window name

include/modules/sway/window.hpp

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <fmt/format.h>
+#include "bar.hpp"
+#include "client.hpp"
+#include "util/chrono.hpp"
+#include "util/json.hpp"
+#include "IModule.hpp"
+
+namespace waybar::modules::sway {
+
+  class Window : public IModule {
+    public:
+      Window(waybar::Bar &bar, Json::Value config);
+      auto update() -> void;
+      operator Gtk::Widget &();
+    private:
+      std::string _getFocusedNode(Json::Value nodes);
+      void _getFocusedWindow();
+      Bar &_bar;
+      Json::Value _config;
+      waybar::util::SleeperThread _thread;
+      Gtk::Label _label;
+      util::JsonParser _parser;
+      int _ipcfd;
+      int _ipcEventfd;
+      std::string _window;
+  };
+
+}