Support list album artist "someartist"

mopidy/mpd/frontend.py

@@ -642,8 +642,8 @@ class MpdFrontend(object):
 
     @handle_pattern(r'^list (?P<field>[Aa]rtist)$')
     @handle_pattern(r'^list "(?P<field>[Aa]rtist)"$')
-    @handle_pattern(r'^list (?P<field>album)( "(?P<artist>[^"]+)")*$')
-    @handle_pattern(r'^list "(?P<field>album)"( "(?P<artist>[^"]+)")*$')
+    @handle_pattern(r'^list (?P<field>album( artist)?)( "(?P<artist>[^"]+)")*$')
+    @handle_pattern(r'^list "(?P<field>album(" "artist)?)"( "(?P<artist>[^"]+)")*$')
     def _music_db_list(self, field, artist=None):
         """
         *musicpd.org, music database section:*
@@ -669,7 +669,7 @@ class MpdFrontend(object):
         - capitalizes the field argument.
         """
         field = field.lower()
-        # TODO
+        pass # TODO
 
     @handle_pattern(r'^listall "(?P<uri>[^"]+)"')
     def _music_db_listall(self, uri):

tests/mpd/frontend_test.py

@@ -1017,6 +1017,10 @@ class MusicDatabaseHandlerTest(unittest.TestCase):
     def test_list_album_with_artist(self):
         result = self.h.handle_request(u'list "album" "anartist"')
         self.assert_(u'OK' in result)
+    
+    def test_list_album_artist_with_artist_without_quotes(self):
+        result = self.h.handle_request(u'list album artist "anartist"')
+        self.assert_(u'OK' in result)
 
     def test_listall(self):
         result = self.h.handle_request(u'listall "file:///dev/urandom"')