ADD replace command

Allow to replace an existing playlist, calling mpd_send_save_queue with
the MPD_QUEUE_SAVE_MODE_REPLACE flag.

Author: oelmekki

doc/index.rst

@@ -252,6 +252,8 @@ Playlist Commands
 
 :command:`save <file>` - Saves playlist as <file>.
 
+:command:`replace <file>` - Replaces playlist in <file>.
+
 :command:`addplaylist <playlist> <file>` - Adds a song from the music database to the
    playlist. The playlist will be created if it does not exist.
    Can also read input from pipes.

src/command.c

@@ -1376,3 +1376,12 @@ cmd_partitiondelete(int argc, char **argv, struct mpd_connection *conn) {
 	}
 	return 0;
 }
+
+int
+cmd_replace(gcc_unused int argc, char **argv, struct mpd_connection *conn)
+{
+	if (!mpd_send_save_queue(conn, charset_to_utf8(argv[0]), MPD_QUEUE_SAVE_MODE_REPLACE)) {
+		printErrorAndExit(conn);
+	}
+	return 0;
+}

src/command.h

@@ -69,4 +69,7 @@ cmd_subscribe(int argc, char **argv, struct mpd_connection *conn);
 int
 cmd_tags(int argc, char **argv, struct mpd_connection *conn);
 
+int
+cmd_replace(int argc, char **argv, struct mpd_connection *conn);
+
 #endif /* COMMAND_H */

src/main.c

@@ -102,6 +102,7 @@ static const struct command {
 	{"readpicture",      1, 1, 0,  cmd_readpicture,      "<uri>", "Download a picture from the given song and write to stdout." },
 	{"renplaylist",      2,  2, 0, cmd_renplaylist,      "<file> <newfile>", "Rename a playlist"},
 	{"repeat",           0,  1, 0, cmd_repeat,           "<on|off>", "Toggle repeat mode, or specify state"},
+	{"replace",          1,  1, 0, cmd_replace,          "<file>", "Save a queue as <file>, replacing the existing one"},
 	{"replaygain",       0, -1, 0, cmd_replaygain,       "[off|track|album]", "Set or display the replay gain mode" },
 	{"rescan",           0, -1, 2, cmd_rescan,           "[<path>]", "Rescan music directory (including unchanged files)"},
 	{"rm",               1,  1, 0, cmd_rm,               "<file>", "Remove a playlist"},