implements the smartstop feature

The smartstop feature is a way to tell mpd to stop playing after
current song.
This patche provides:
- 'state' command returns 'smartstop' state (1 or 0)
- 'smartstop' can activate or not the smartstop state
- when song is terminated, mpd stops playing and smartstop is set to 0

src/command.c

@@ -59,6 +59,7 @@
 #define COMMAND_STATUS_VOLUME           "volume"
 #define COMMAND_STATUS_STATE            "state"
 #define COMMAND_STATUS_REPEAT           "repeat"
+#define COMMAND_STATUS_SMARTSTOP	"smartstop"
 #define COMMAND_STATUS_RANDOM           "random"
 #define COMMAND_STATUS_PLAYLIST         "playlist"
 #define COMMAND_STATUS_PLAYLIST_LENGTH  "playlistlength"
@@ -469,6 +470,7 @@ handle_status(struct client *client,
 		      COMMAND_STATUS_VOLUME ": %i\n"
 		      COMMAND_STATUS_REPEAT ": %i\n"
 		      COMMAND_STATUS_RANDOM ": %i\n"
+		      COMMAND_STATUS_SMARTSTOP ": %i\n"
 		      COMMAND_STATUS_PLAYLIST ": %li\n"
 		      COMMAND_STATUS_PLAYLIST_LENGTH ": %i\n"
 		      COMMAND_STATUS_CROSSFADE ": %i\n"
@@ -476,6 +478,7 @@ handle_status(struct client *client,
 		      volume_level_get(),
 		      getPlaylistRepeatStatus(&g_playlist),
 		      getPlaylistRandomStatus(&g_playlist),
+		      getPlaylistSmartstopStatus(&g_playlist),
 		      getPlaylistVersion(&g_playlist),
 		      getPlaylistLength(&g_playlist),
 		      (int)(getPlayerCrossFade() + 0.5),
@@ -1092,6 +1095,24 @@ handle_repeat(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 	return COMMAND_RETURN_OK;
 }
 
+static enum command_return
+handle_smartstop(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
+{
+	int status;
+
+	if (!check_int(client, &status, argv[1], need_integer))
+		return COMMAND_RETURN_ERROR;
+
+	if (status != 0 && status != 1) {
+		command_error(client, ACK_ERROR_ARG,
+			      "\"%i\" is not 0 or 1", status);
+		return COMMAND_RETURN_ERROR;
+	}
+
+	setPlaylistSmartstopStatus(&g_playlist, status);
+	return COMMAND_RETURN_OK;
+}
+
 static enum command_return
 handle_random(struct client *client, G_GNUC_UNUSED int argc, char *argv[])
 {
@@ -1602,6 +1623,7 @@ static const struct command commands[] = {
 	{ "seekid", PERMISSION_CONTROL, 2, 2, handle_seekid },
 	{ "setvol", PERMISSION_CONTROL, 1, 1, handle_setvol },
 	{ "shuffle", PERMISSION_CONTROL, 0, 1, handle_shuffle },
+	{ "smartstop", PERMISSION_CONTROL, 1, 1, handle_smartstop },
 	{ "stats", PERMISSION_READ, 0, 0, handle_stats },
 	{ "status", PERMISSION_READ, 0, 0, handle_status },
 #ifdef ENABLE_SQLITE