Metadata option (beetbox#6041)

My usecase needs the `convert` to not write tags so I can write my own
APEv2 tags. This PR adds a write_metadata option to disable the
`convert` plugin writing metadata to the converted files.

Author: snejus

beetsplug/convert.py

@@ -122,6 +122,7 @@ def __init__(self):
                 "threads": os.cpu_count(),
                 "format": "mp3",
                 "id3v23": "inherit",
+                "write_metadata": True,
                 "formats": {
                     "aac": {
                         "command": (
@@ -446,8 +447,9 @@ def convert_item(
             if id3v23 == "inherit":
                 id3v23 = None
 
-            # Write tags from the database to the converted file.
-            item.try_write(path=converted, id3v23=id3v23)
+            # Write tags from the database to the file if requested
+            if self.config["write_metadata"].get(bool):
+                item.try_write(path=converted, id3v23=id3v23)
 
             if keep_new:
                 # If we're keeping the transcoded file, read it again (after

docs/changelog.rst

@@ -11,6 +11,8 @@ New features:
 
 - :doc:`plugins/lastgenre`: Add a ``--pretend`` option to preview genre changes
   without storing or writing them.
+- :doc:`plugins/convert`: Add a config option to disable writing metadata to
+  converted files.
 - :doc:`plugins/discogs`: New config option `strip_disambiguation` to toggle
   stripping discogs numeric disambiguation on artist and label fields.
 

docs/plugins/convert.rst

@@ -97,6 +97,8 @@ The available options are:
 - **embed**: Embed album art in converted items. Default: ``yes``.
 - **id3v23**: Can be used to override the global ``id3v23`` option. Default:
   ``inherit``.
+- **write_metadata**: Can be used to disable writing metadata to converted
+  files. Default: ``true``.
 - **max_bitrate**: By default, the plugin does not transcode files that are
   already in the destination format. This option instead also transcodes files
   with high bitrates, even if they are already in the same format as the output.