mirror of
https://github.com/beetbox/beets.git
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87 lines
2.6 KiB
Python
87 lines
2.6 KiB
Python
"""Uses user-specified rewriting rules to canonicalize names for path
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formats.
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"""
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import re
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from collections import defaultdict
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from functools import singledispatch
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from typing import Any, TypeVar
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from beets import library
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from beets.exceptions import UserError
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from beets.plugins import BeetsPlugin
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T = TypeVar("T")
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@singledispatch
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def rewrite_value(value: Any, pat: re.Pattern[str], repl: str) -> Any:
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"""Rewrite a value if it matches the given pattern."""
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return value
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@rewrite_value.register
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def _(value: str, pat: re.Pattern[str], repl: str) -> str:
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if pat.match(value.lower()):
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return repl
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return value
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@rewrite_value.register(list)
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def _(value: list[str], pat: re.Pattern[str], repl: str) -> list[str]:
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return [rewrite_value(v, pat, repl) for v in value]
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def apply_rewrite_rules(
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value: T, rules: list[tuple[re.Pattern[str], str]]
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) -> T:
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"""Apply all matching rewrite rules to the given value."""
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for pattern, replacement in rules:
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value = rewrite_value(value, pattern, replacement)
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return value
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def rewriter(field, rules):
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"""Create a template field function that rewrites the given field
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with the given rewriting rules. ``rules`` must be a list of
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(pattern, replacement) pairs.
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"""
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def fieldfunc(item):
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return apply_rewrite_rules(item._values_fixed[field], rules)
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return fieldfunc
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class RewritePlugin(BeetsPlugin):
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def __init__(self):
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super().__init__()
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self.config.add({})
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# Gather all the rewrite rules for each field.
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rules = defaultdict(list)
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for key, view in self.config.items():
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value = view.as_str()
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try:
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fieldname, pattern = key.split(None, 1)
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except ValueError:
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raise UserError("invalid rewrite specification")
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if fieldname not in library.Item._fields:
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raise UserError(f"invalid field name ({fieldname}) in rewriter")
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self._log.debug("adding template field {}", key)
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pattern = re.compile(pattern.lower())
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rules[fieldname].append((pattern, value))
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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((pattern, value))
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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 library.Album._fields:
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self.album_template_fields[fieldname] = getter
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