feat: Add basic support for MPD

include/factory.hpp

@@ -23,6 +23,9 @@
 #ifdef HAVE_LIBPULSE
 #include "modules/pulseaudio.hpp"
 #endif
+#ifdef HAVE_LIBMPDCLIENT
+#include "modules/mpd.hpp"
+#endif
 #include "modules/temperature.hpp"
 #include "modules/custom.hpp"
 

include/modules/mpd.hpp

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <thread>
+#include <fmt/format.h>
+#include <mpd/client.h>
+#include "ALabel.hpp"
+
+namespace waybar::modules {
+
+class MPD : public ALabel {
+  public:
+    MPD(const std::string&, const Json::Value&);
+    auto update() -> void;
+  private:
+    std::thread worker();
+    void setLabel();
+    void tryConnect();
+    void checkErrors();
+    void fetchState();
+    void waitForEvent();
+
+    std::thread worker_;
+
+    using unique_connection = std::unique_ptr<mpd_connection, decltype(&mpd_connection_free)>;
+    using unique_status     = std::unique_ptr<mpd_status, decltype(&mpd_status_free)>;
+    using unique_song      = std::unique_ptr<mpd_song, decltype(&mpd_song_free)>;
+
+    // Not using unique_ptr since we don't manage the pointer
+    // (It's either nullptr, or from the config)
+    const char* server;
+
+    unique_connection connection_;
+    unique_status     status_;
+    unique_song       song_;
+
+    bool stopped_;
+};
+
+}  // namespace waybar::modules