MPD: Support 'plchanges' without quotes to work with BitMPC

docs/changes.rst

@@ -25,6 +25,7 @@ Another great release.
   - Fixed ``play "-1"`` and ``playid "-1"`` behaviour when playlist is empty.
   - Support ``plchanges "-1"`` to work better with MPDroid.
   - Support ``pause`` without arguments to work better with MPDroid.
+  - Support ``plchanges`` without quotes to work better with BitMPC.
 
 - Backend API:
 

mopidy/frontends/mpd/protocol/current_playlist.py

@@ -257,6 +257,7 @@ def playlistsearch(frontend, tag, needle):
     """
     raise MpdNotImplemented # TODO
 
+@handle_pattern(r'^plchanges (?P<version>-?\d+)$')
 @handle_pattern(r'^plchanges "(?P<version>-?\d+)"$')
 def plchanges(frontend, version):
     """

tests/frontends/mpd/current_playlist_test.py

@@ -330,6 +330,15 @@ class CurrentPlaylistHandlerTest(unittest.TestCase):
         self.assert_(u'Title: c' in result)
         self.assert_(u'OK' in result)
 
+    def test_plchanges_without_quotes_works(self):
+        self.b.current_playlist.load(
+            [Track(name='a'), Track(name='b'), Track(name='c')])
+        result = self.h.handle_request(u'plchanges 0')
+        self.assert_(u'Title: a' in result)
+        self.assert_(u'Title: b' in result)
+        self.assert_(u'Title: c' in result)
+        self.assert_(u'OK' in result)
+
     def test_plchangesposid(self):
         self.b.current_playlist.load([Track(), Track(), Track()])
         result = self.h.handle_request(u'plchangesposid "0"')