feat(sway): add focused window name

src/modules/sway/window.cpp

@@ -0,0 +1,66 @@
+#include "modules/sway/window.hpp"
+#include "modules/sway/ipc/client.hpp"
+
+waybar::modules::sway::Window::Window(Bar &bar, Json::Value config)
+  : _bar(bar), _config(config)
+{
+  _label.set_name("window");
+  std::string socketPath = get_socketpath();
+  _ipcfd = ipc_open_socket(socketPath);
+  _ipcEventfd = ipc_open_socket(socketPath);
+  const char *subscribe = "[ \"window\" ]";
+  uint32_t len = strlen(subscribe);
+  ipc_single_command(_ipcEventfd, IPC_SUBSCRIBE, subscribe, &len);
+  _getFocusedWindow();
+  _thread = [this] {
+    try {
+      if (_bar.outputName.empty()) {
+        // Wait for the name of the output
+        while (_bar.outputName.empty())
+          _thread.sleep_for(chrono::milliseconds(150));
+      }
+      auto res = ipc_recv_response(_ipcEventfd);
+      auto parsed = _parser.parse(res.payload);
+      if (parsed["change"] != "focus")
+        return;
+      _window = parsed["container"]["name"].asString();
+      Glib::signal_idle().connect_once(sigc::mem_fun(*this, &Window::update));
+    } catch (const std::exception& e) {
+      std::cerr << e.what() << std::endl;
+    }
+  };
+}
+
+auto waybar::modules::sway::Window::update() -> void
+{
+  _label.set_text(_window);
+}
+
+std::string waybar::modules::sway::Window::_getFocusedNode(Json::Value nodes)
+{
+  for (auto &node : nodes) {
+    if (node["focused"].asBool())
+      return node["name"].asString();
+    auto res = _getFocusedNode(node["nodes"]);
+    if (!res.empty())
+      return res;
+  }
+  return std::string();
+}
+
+void waybar::modules::sway::Window::_getFocusedWindow()
+{
+  try {
+    uint32_t len = 0;
+    auto res = ipc_single_command(_ipcfd, IPC_GET_TREE, nullptr, &len);
+    auto parsed = _parser.parse(res);
+    _window = _getFocusedNode(parsed["nodes"]);
+    Glib::signal_idle().connect_once(sigc::mem_fun(*this, &Window::update));
+  } catch (const std::exception &e) {
+    std::cerr << e.what() << std::endl;
+  }
+}
+
+waybar::modules::sway::Window::operator Gtk::Widget &() {
+  return _label;
+}