idle: added "update" event

Some clients have visual feedback for "database update is running".
Using the "database" idle event is unreliable, because it is only
emitted when the database was actually modified.  This patch adds the
"update" event, which is emitted when the update is started, and again
when the update is finished, disregarding whether it has been
modified.

3 files changed, 9 insertions, 0 deletions

diff --git a/src/idle.c b/src/idle.c
index 11b57376d..c0bb7a908 100644
--- a/src/idle.c
+++ b/src/idle.c
@@ -40,6 +40,7 @@ static const char *const idle_names[] = {
 	"output",
 	"options",
 	"sticker",
+	"update",
         NULL
 };
 
diff --git a/src/idle.h b/src/idle.h
index a69acabb0..c8ed57f74 100644
--- a/src/idle.h
+++ b/src/idle.h
@@ -50,6 +50,9 @@ enum {
 
 	/** a sticker has been modified. */
 	IDLE_STICKER = 0x80,
+
+	/** a database update has started or finished. */
+	IDLE_UPDATE = 0x100,
 };
 
 /**
diff --git a/src/update.c b/src/update.c
index 1088f5338..d3e3b7650 100644
--- a/src/update.c
+++ b/src/update.c
@@ -822,6 +822,9 @@ directory_update_init(char *path)
 		return next_task_id > update_task_id_max ?  1 : next_task_id;
 	}
 	spawn_update_task(path);
+
+	idle_add(IDLE_UPDATE);
+
 	return update_task_id;
 }
 
@@ -861,6 +864,8 @@ static void update_finished_event(void)
 
 	g_thread_join(update_thr);
 
+	idle_add(IDLE_UPDATE);
+
 	if (modified) {
 		/* send "idle" events */
 		playlistVersionChange(&g_playlist);