Inline Plugin

The inline plugin lets you use Python to customize your path formats. Using it, you can define template fields in your beets configuration file and refer to them from your template strings in the paths: section (see Configuration).

To use the inline plugin, enable it in your configuration (see Using Plugins). Then, make a item_fields: block in your config file. Under this key, every line defines a new template field; the key is the name of the field (you’ll use the name to refer to the field in your templates) and the value is a Python expression or function body. The Python code has all of a track’s fields in scope, so you can refer to any normal attributes (such as artist or title) as Python variables.

Here are a couple of examples of expressions:

    initial: albumartist[0].upper() + u'.'
    disc_and_track: u'%02i.%02i' % (disc, track) if
                    disctotal > 1 else u'%02i' % (track)

Note that YAML syntax allows newlines in values if the subsequent lines are indented.

These examples define $initial and $disc_and_track fields that can be referenced in path templates like so:

    default: $initial/$artist/$album%aunique{}/$disc_and_track $title

Block Definitions

If you need to use statements like import, you can write a Python function body instead of a single expression. In this case, you’ll need to return a result for the value of the path field, like so:

    filename: |
        import os
        from beets.util import bytestring_path
        return bytestring_path(os.path.basename(path))

You might want to use the YAML syntax for “block literals,” in which a leading | character indicates a multi-line block of text.

Album Fields

The above examples define fields for item templates, but you can also define fields for album templates. Use the album_fields configuration section. In this context, all existing album fields are available as variables along with items, which is a list of items in the album.

This example defines a $bitrate field for albums as the average of the tracks’ fields:

    bitrate: |
        total = 0
        for item in items:
            total += item.bitrate
        return total / len(items)