Add 'urlhandler' command

mopidy/backends/dummy.py

@@ -1,4 +1,5 @@
 from mopidy.backends.base import BaseBackend
 
 class DummyBackend(BaseBackend):
-    pass
+    def url_handlers(self):
+        return [u'dummy:']

mopidy/backends/spotify.py

@@ -28,4 +28,5 @@ class SpotifyBackend(BaseBackend):
             playlists.append(u'playlist: %s' % playlist.name.decode('utf-8'))
         return playlists
 
-
+    def url_handlers(self):
+        return [u'spotify:', u'http://open.spotify.com/']

mopidy/handler.py

@@ -340,3 +340,7 @@ class MpdHandler(object):
     @register(r'^update( "(?P<uri>[^"]+)")*$')
     def _update(self, uri=None, rescan_unmodified_files=False):
         return u'updating_db: 0' # TODO
+
+    @register(r'^urlhandlers$')
+    def _urlhandlers(self):
+        return self.backend.url_handlers()

tests/handlertest.py

@@ -557,4 +557,8 @@ class ReflectionHandlerTest(unittest.TestCase):
     def setUp(self):
         self.h = handler.MpdHandler(backend=DummyBackend)
 
+    def test_urlhandlers(self):
+        result = self.h.handle_request(u'urlhandlers')
+        self.assert_('dummy:' in result)
+
     pass # TODO