Automatically strip beet root from files

This assumes that your mpd and beet roots are the same directory

mv3u.py

@@ -1,7 +1,9 @@
 from beets.plugins import BeetsPlugin
+from beets import config
 import os
 
-rename_cache = os.path.expanduser('~/.cache/beets_mv3u_renames')
+rename_cache = os.path.expanduser('~/beets_mv3u_renames')
+music_root = config['directory'].get()
 
 class MV3U(BeetsPlugin):
     def __init__(self):
@@ -38,8 +40,8 @@ class MV3U(BeetsPlugin):
 
 
     def add_rename(self, item):
-        src = item.path.decode()
-        dst = item.destination().decode()
+        src = item.path.decode().replace(music_root, '')
+        dst = item.destination().decode().replace(music_root, '')
         with open(rename_cache, 'a') as cache:
             cache.write(f'{src}\t\t{dst}\n')