local: Add default config and config schema

mopidy/backends/local/__init__.py

@@ -2,8 +2,25 @@ from __future__ import unicode_literals
 
 import mopidy
 from mopidy import ext
+from mopidy.utils import config, formatting
 
 
+default_config = """
+[ext.local]
+
+# If the local extension should be enabled or not
+enabled = true
+
+# Path to folder with local music
+music_path = $XDG_MUSIC_DIR
+
+# Path to playlist folder with m3u files for local music
+playlist_path = $XDG_DATA_DIR/mopidy/playlists
+
+# Path to tag cache for local music
+tag_cache_file = $XDG_DATA_DIR/mopidy/tag_cache
+"""
+
 __doc__ = """A backend for playing music from a local music archive.
 
 This backend handles URIs starting with ``file:``.
@@ -19,12 +36,12 @@ https://github.com/mopidy/mopidy/issues?labels=Local+backend
 
 - None
 
-**Settings:**
+**Default config:**
 
-- :attr:`mopidy.settings.LOCAL_MUSIC_PATH`
-- :attr:`mopidy.settings.LOCAL_PLAYLIST_PATH`
-- :attr:`mopidy.settings.LOCAL_TAG_CACHE_FILE`
-"""
+.. code-block:: ini
+
+%(config)s
+""" % {'config': formatting.indent(default_config)}
 
 
 class Extension(ext.Extension):
@@ -33,10 +50,13 @@ class Extension(ext.Extension):
     version = mopidy.__version__
 
     def get_default_config(self):
-        return '[ext.local]'
+        return default_config
 
-    def validate_config(self, config):
-        pass
+    def get_config_schema(self):
+        schema = config.ExtensionConfigSchema()
+        schema['music_path'] = config.String()
+        schema['playlist_path'] = config.String()
+        schema['tag_cache_file'] = config.String()
 
     def validate_environment(self):
         pass