waybar/include/modules/mpd.hpp
2020-01-07 09:15:54 -08:00

75 lines
2.2 KiB
C++

#pragma once
#include <fmt/format.h>
#include <mpd/client.h>
#include <condition_variable>
#include <thread>
#include "ALabel.hpp"
namespace waybar::modules {
class MPD : public ALabel {
public:
MPD(const std::string&, const Json::Value&);
auto update() -> void;
private:
std::thread periodic_updater();
std::string getTag(mpd_tag_type type, unsigned idx = 0);
void setLabel();
std::string getStateIcon();
std::string getOptionIcon(std::string optionName, bool activated);
std::thread event_listener();
// Assumes `connection_lock_` is locked
void tryConnect();
// If checking errors on the main connection, make sure to lock it using
// `connection_lock_` before calling checkErrors
void checkErrors(mpd_connection* conn);
// Assumes `connection_lock_` is locked
void fetchState();
void waitForEvent();
bool handlePlayPause(GdkEventButton* const&);
bool stopped();
bool playing();
bool paused();
const std::string module_name_;
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_;
const unsigned port_;
unsigned timeout_;
// We need a mutex here because we can trigger updates from multiple thread:
// the event based updates, the periodic updates needed for the elapsed time,
// and the click play/pause feature
std::mutex connection_lock_;
unique_connection connection_;
// The alternate connection will be used to wait for events: since it will
// be blocking (idle) we can't send commands via this connection
//
// No lock since only used in the event listener thread
unique_connection alternate_connection_;
// Protect them using the `connection_lock_`
unique_status status_;
mpd_state state_;
unique_song song_;
// To make sure the previous periodic_updater stops before creating a new one
std::mutex periodic_lock_;
};
} // namespace waybar::modules