Allow scanner to stop nicely when it runs out of files

mopidy/scanner.py

@@ -15,6 +15,7 @@ class Scanner(object):
     def __init__(self, files, callback):
         self.uris = [path_to_uri(abspath(f)) for f in files]
         self.callback = callback
+        self.loop = gobject.MainLoop()
 
         self.pipe = gst.element_factory_make('playbin2')
 
@@ -24,8 +25,6 @@ class Scanner(object):
 
         self.next_uri()
 
-        gobject.MainLoop().run()
-
     def process_message(self, bus, message):
         data = message.parse_tag()
         self.callback(dict([(k, data[k]) for k in data.keys()]))
@@ -33,17 +32,14 @@ class Scanner(object):
 
     def next_uri(self):
         if not self.uris:
-            sys.exit(0)
+            return self.stop()
 
         self.pipe.set_state(gst.STATE_NULL)
         self.pipe.set_property('uri', self.uris.pop())
         self.pipe.set_state(gst.STATE_PAUSED)
 
-def debug(data):
-    print data
+    def start(self):
+        self.loop.run()
 
-if __name__ == '__main__':
-    if len(sys.argv) == 1:
-        sys.exit(1)
-
-    Scanner(sys.argv[1:], debug)
+    def stop(self):
+        self.loop.quit()