From 6e942a92b3a74d845f55b30e3e6a1b452d6a5b00 Mon Sep 17 00:00:00 2001
From: Thomas Adamcik <thomas@adamcik.no>
Date: Thu, 4 Jul 2013 17:49:10 +0200
Subject: [PATCH] audio: Post an error if an urilist expands to another urilist

---
 mopidy/audio/playlists.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/mopidy/audio/playlists.py b/mopidy/audio/playlists.py
index 17b94b97..011326ee 100644
--- a/mopidy/audio/playlists.py
+++ b/mopidy/audio/playlists.py
@@ -306,8 +306,21 @@ class UriListElement(BasePlaylistElement):
 
     def pad_added(self, src, pad):
         self.srcpad.set_target(pad)
+        pad.add_event_probe(self.pad_event)
+
+    def pad_event(self, pad, event):
+        if event.has_name('urilist-played'):
+            error = gst.GError(gst.RESOURCE_ERROR, gst.RESOURCE_ERROR_FAILED,
+                               b'Nested playlists not supported.')
+            message = gst.message_new_error(self, error, b'Playlists pointing to other playlists is not supported')
+            self.post_message(message)
+        return True
 
     def handle(self, uris):
+        struct = gst.Structure('urilist-played')
+        event = gst.event_new_custom(gst.EVENT_CUSTOM_UPSTREAM, struct)
+        self.sinkpad.push_event(event)
+
         # TODO: hookup about to finish and errors to rest of URIs so we
         # round robin, only giving up once all have been tried.
         # TODO: uris could be empty.