Add support for artist aliases

Use MusicBrainz artist aliases to import files with artist names in an
appriorate locale

beets/autotag/mb.py

@@ -48,6 +48,11 @@ RELEASE_INCLUDES = ['artists', 'media', 'recordings', 'release-groups',
                     'labels', 'artist-credits']
 TRACK_INCLUDES = ['artists']
 
+# only versions >= 0.3 support artist aliases
+if musicbrainzngs.musicbrainz._version >= '0.3':
+    RELEASE_INCLUDES.append('aliases')
+    TRACK_INCLUDES.append('aliases')
+
 def configure():
     """Set up the python-musicbrainz-ngs module according to settings
     from the beets configuration. This should be called at startup.
@@ -74,12 +79,42 @@ def _flatten_artist_credit(credit):
             artist_sort_parts.append(el)
 
         else:
+            prefered_locales = config['import']['artist_aliases'].as_str_seq()
+            chosen_alias = None
+            if 'alias-list' in el['artist']:
+                alias_list = el['artist']['alias-list']
+                # Get a list of the aliases that have set locales
+                set_locales = [a for a in alias_list if 'locale' in a]
+                # Search locales in order
+                for locale in prefered_locales:
+                    # Does anything match 
+                    matches = [a for a in set_locales if a['locale'] == locale]
+                    # Skip to next locale if no matches
+                    if len(matches) == 0: 
+                        continue
+                    # Find the aliases that have the primary flag set
+                    primaries = [a for a in matches if 'primary' in a]
+                    # Take the primary if we have it, otherwise take the first
+                    # match with the correct locale
+                    if len(primaries) > 0:
+                        chosen_alias = primaries[0]
+                    else:
+                        chosen_alias = matches[0]
+                    # If we get here we must have found an acceptable alias
+                    # so stop looking
+                    break
+                    
             # An artist.
-            cur_artist_name = el['artist']['name']
+            if chosen_alias is not None:
+                cur_artist_name = chosen_alias['alias']
+            else:
+                cur_artist_name = el['artist']['name']
             artist_parts.append(cur_artist_name)
 
             # Artist sort name.
-            if 'sort-name' in el['artist']:
+            if chosen_alias is not None:
+                artist_sort_parts.append(chosen_alias['sort-name'])
+            elif 'sort-name' in el['artist']:
                 artist_sort_parts.append(el['artist']['sort-name'])
             else:
                 artist_sort_parts.append(cur_artist_name)

beets/config_default.yaml

@@ -16,6 +16,7 @@ import:
     quiet: no
     singletons: no
     default_action: apply
+    artist_aliases: []
 
 clutter: ["Thumbs.DB", ".DS_Store"]
 ignore: [".*", "*~"]