Implement support for reloading of config files.

Fixes #759.

include/client.hpp

@@ -14,6 +14,7 @@ class Client {
  public:
   static Client *inst();
   int            main(int argc, char *argv[]);
+  void           reset();
 
   Glib::RefPtr<Gtk::Application>      gtk_app;
   Glib::RefPtr<Gdk::Display>          gdk_display;

src/client.cpp

@@ -269,10 +269,9 @@ int waybar::Client::main(int argc, char *argv[]) {
   gtk_app->hold();
   gtk_app->run();
   bars.clear();
-  zxdg_output_manager_v1_destroy(xdg_output_manager);
-  zwlr_layer_shell_v1_destroy(layer_shell);
-  zwp_idle_inhibit_manager_v1_destroy(idle_inhibit_manager);
-  wl_registry_destroy(registry);
-  wl_display_disconnect(wl_display);
   return 0;
 }
+
+void waybar::Client::reset() {
+  gtk_app->quit();
+}

src/main.cpp

@@ -8,6 +8,7 @@
 
 std::mutex reap_mtx;
 std::list<pid_t> reap;
+volatile bool reload;
 
 void* signalThread(void* args) {
   int err, signum;
@@ -70,12 +71,19 @@ void startSignalThread(void) {
 int main(int argc, char* argv[]) {
   try {
     auto client = waybar::Client::inst();
+
     std::signal(SIGUSR1, [](int /*signal*/) {
       for (auto& bar : waybar::Client::inst()->bars) {
         bar->toggle();
       }
     });
 
+    std::signal(SIGUSR2, [](int /*signal*/) {
+        spdlog::info("Reloading...");
+        reload = true;
+        waybar::Client::inst()->reset();
+    });
+
     for (int sig = SIGRTMIN + 1; sig <= SIGRTMAX; ++sig) {
       std::signal(sig, [](int sig) {
         for (auto& bar : waybar::Client::inst()->bars) {
@@ -85,7 +93,12 @@ int main(int argc, char* argv[]) {
     }
     startSignalThread();
 
-    auto ret = client->main(argc, argv);
+    auto ret = 0;
+    do {
+      reload = false;
+      ret = client->main(argc, argv);
+    } while (reload);
+
     delete client;
     return ret;
   } catch (const std::exception& e) {