mpdstats: use MPD_PORT env variable

beetsplug/mpdstats.py

@@ -326,7 +326,7 @@ class MPDStatsPlugin(plugins.BeetsPlugin):
             'rating':          True,
             'rating_mix':      0.75,
             'host':            os.environ.get('MPD_HOST', u'localhost'),
-            'port':            6600,
+            'port':            int(os.environ.get('MPD_PORT', 6600)),
             'password':        u'',
         })
         mpd_config['password'].redact = True

docs/plugins/mpdstats.rst

@@ -42,7 +42,8 @@ configuration file. The available options are:
   Default: The ``$MPD_HOST`` environment variable if set,
   falling back to ``localhost`` otherwise.
 - **port**: The MPD server port.
-  Default: 6600.
+  Default: The ``$MPD_PORT`` environment variable if set,
+  falling back to 6600 otherwise.
 - **password**: The MPD server password.
   Default: None.
 - **music_directory**: If your MPD library is at a different location from the