Add mpc status %updateid%

Author: kuremu

doc/index.rst

@@ -470,6 +470,7 @@ Other Commands
    %samplerate%       The sample rate in Hz extracted from the current MPD audio format.
    %bits%             The number of significant bits per sample size extracted from the current MPD audio format.
    %channels%         The number of channels extracted from the current MPD audio format.
+   %updateid%         The current MPD update ID. 0 if there is no update in progress.
 
    ================== ======================================================
 

src/status_format.c

@@ -142,6 +142,9 @@ status_value(const struct mpd_status *status, const char *name)
 		} else {
 			return NULL;
 		}
+	} else if (strcmp(name, "updateid") == 0) {
+		unsigned update_id = mpd_status_get_update_id(status);
+		snprintf(buffer, sizeof(buffer), "%i", update_id);
 	}
 	else { return NULL; }
 	return buffer;