core/mpd/local: Add title to get_distinct field types

docs/changelog.rst

@@ -5,6 +5,14 @@ Changelog
 This changelog is used to track all major changes to Mopidy.
 
 
+v1.0.6 (unreleased)
+===================
+
+Bug fix release.
+
+- Core/MPD/Local: Add support for ``title`` in
+  :meth:`mopidy.core.LibraryController.get_distinct`. (Fixes: :issue:`1181`)
+
 v1.0.5 (2015-05-19)
 ===================
 

mopidy/backend.py

@@ -97,6 +97,9 @@ class LibraryProvider(object):
         *MAY be implemented by subclass.*
 
         Default implementation will simply return an empty set.
+
+        Note that backends should always return an empty set for unexpected
+        field types.
         """
         return set()
 

mopidy/core/library.py

@@ -85,8 +85,8 @@ class LibraryController(object):
         protocol supports in a more sane fashion. Other frontends are not
         recommended to use this method.
 
-        :param string field: One of ``artist``, ``albumartist``, ``album``,
+        :param string field: One of ``title``, ``artist``, ``albumartist``,
-            ``composer``, ``performer``, ``date``or ``genre``.
+            ``album``, ``composer``, ``performer``, ``date``or ``genre``.
         :param dict query: Query to use for limiting results, see
             :meth:`search` for details about the query format.
         :rtype: set of values corresponding to the requested field type.

mopidy/local/json.py

@@ -141,7 +141,10 @@ class JsonLibrary(local.Library):
             return []
 
     def get_distinct(self, field, query=None):
-        if field == 'artist':
+        if field == 'title':
+            def distinct(track):
+                return {track.name}
+        elif field == 'artist':
             def distinct(track):
                 return {a.name for a in track.artists}
         elif field == 'albumartist':

mopidy/mpd/protocol/music_db.py

@@ -22,6 +22,7 @@ _SEARCH_MAPPING = {
     'track': 'track_no'}
 
 _LIST_MAPPING = {
+    'title': 'title',
     'album': 'album',
     'albumartist': 'albumartist',
     'artist': 'artist',
@@ -31,6 +32,7 @@ _LIST_MAPPING = {
     'performer': 'performer'}
 
 _LIST_NAME_MAPPING = {
+    'title': 'Title',
     'album': 'Album',
     'albumartist': 'AlbumArtist',
     'artist': 'Artist',