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82 lines
3 KiB
Python
82 lines
3 KiB
Python
# This file is part of beets.
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# Copyright 2023, Max Rumpf.
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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"""Plugin to rewrite fields based on a given query."""
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from collections import defaultdict
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import shlex
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import confuse
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from beets import ui
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from beets.dbcore import AndQuery, query_from_strings
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from beets.library import Item, Album
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from beets.plugins import BeetsPlugin
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def rewriter(field, rules):
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"""Template field function factory.
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Create a template field function that rewrites the given field
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with the given rewriting rules.
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``rules`` must be a list of (query, replacement) pairs.
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"""
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def fieldfunc(item):
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value = item._values_fixed[field]
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for query, replacement in rules:
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if query.match(item):
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# Rewrite activated.
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return replacement
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# Not activated; return original value.
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return value
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return fieldfunc
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class AdvancedRewritePlugin(BeetsPlugin):
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"""Plugin to rewrite fields based on a given query."""
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def __init__(self):
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"""Parse configuration and register template fields for rewriting."""
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super().__init__()
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template = confuse.Sequence({
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'match': str,
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'field': str,
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'replacement': str,
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})
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# Gather all the rewrite rules for each field.
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rules = defaultdict(list)
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for rule in self.config.get(template):
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query = query_from_strings(AndQuery, Item, prefixes={},
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query_parts=shlex.split(rule['match']))
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fieldname = rule['field']
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replacement = rule['replacement']
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if fieldname not in Item._fields:
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raise ui.UserError(
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"invalid field name (%s) in rewriter" % fieldname)
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self._log.debug('adding template field {0} → {1}',
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fieldname, replacement)
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rules[fieldname].append((query, replacement))
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if fieldname == 'artist':
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# Special case for the artist field: apply the same
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# rewrite for "albumartist" as well.
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rules['albumartist'].append((query, replacement))
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# Replace each template field with the new rewriter function.
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for fieldname, fieldrules in rules.items():
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getter = rewriter(fieldname, fieldrules)
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self.template_fields[fieldname] = getter
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if fieldname in Album._fields:
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self.album_template_fields[fieldname] = getter
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