Adds a zero_disc_number_if_single_disc to the zero plugin

beetsplug/zero.py

@@ -41,6 +41,7 @@ def __init__(self):
                 "fields": [],
                 "keep_fields": [],
                 "update_database": False,
+                "zero_disc_number_if_single_disc": False
             }
         )
 
@@ -123,8 +124,13 @@ def set_fields(self, item, tags):
         """
         fields_set = False
 
+        if 'disc' in tags and self.config["zero_disc_number_if_single_disc"].get(bool):
+            if getattr(item, 'disctotal', None) == 1:
+                self._log.debug("{0}: {1} -> None", 'disc', item['disc'])
+                tags['disc'] = None
+
         if not self.fields_to_progs:
-            self._log.warning("no fields, nothing to do")
+            self._log.warning("no fields list to remove")
             return False
 
         for field, progs in self.fields_to_progs.items():

docs/changelog.rst

@@ -33,6 +33,9 @@ New features:
 * :doc:`plugins/mpdstats`: Add new configuration option,
   ``played_ratio_threshold``, to allow configuring the percentage the song must
   be played for it to be counted as played instead of skipped.
+* :doc:`plugins/zero`: Add new configuration option,
+  ``zero_disc_number_if_single_disc``, to allow zeroing the disc number on
+  write for single-disc albums. Defaults to False.
 
 Bug fixes:
 

docs/plugins/zero.rst

@@ -30,6 +30,8 @@ fields to nullify and the conditions for nullifying them:
   ``fields`` or ``keep_fields``---not both!
 * To conditionally filter a field, use ``field: [regexp, regexp]`` to specify
   regular expressions.
+* Set ``zero_disc_number_if_single_disc`` to True to zero the disc number
+  field only if the album contains a disctotal count and is a single disc
 * By default this plugin only affects files' tags; the beets database is left
   unchanged. To update the tags in the database, set the ``update_database`` option to true.