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767 lines
25 KiB
Python
767 lines
25 KiB
Python
# -*- coding: utf-8 -*-
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# This file is part of beets.
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# Copyright 2016, Adrian Sampson.
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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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"""Support for beets plugins."""
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from __future__ import division, absolute_import, print_function
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import traceback
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import re
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import inspect
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import abc
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from collections import defaultdict
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from functools import wraps
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import beets
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from beets import logging
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import mediafile
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import six
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PLUGIN_NAMESPACE = 'beetsplug'
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# Plugins using the Last.fm API can share the same API key.
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LASTFM_KEY = '2dc3914abf35f0d9c92d97d8f8e42b43'
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# Global logger.
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log = logging.getLogger('beets')
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class PluginConflictException(Exception):
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"""Indicates that the services provided by one plugin conflict with
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those of another.
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For example two plugins may define different types for flexible fields.
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"""
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class PluginLogFilter(logging.Filter):
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"""A logging filter that identifies the plugin that emitted a log
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message.
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"""
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def __init__(self, plugin):
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self.prefix = u'{0}: '.format(plugin.name)
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def filter(self, record):
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if hasattr(record.msg, 'msg') and isinstance(record.msg.msg,
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six.string_types):
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# A _LogMessage from our hacked-up Logging replacement.
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record.msg.msg = self.prefix + record.msg.msg
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elif isinstance(record.msg, six.string_types):
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record.msg = self.prefix + record.msg
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return True
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# Managing the plugins themselves.
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class BeetsPlugin(object):
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"""The base class for all beets plugins. Plugins provide
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functionality by defining a subclass of BeetsPlugin and overriding
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the abstract methods defined here.
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"""
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def __init__(self, name=None):
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"""Perform one-time plugin setup.
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"""
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self.name = name or self.__module__.split('.')[-1]
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self.config = beets.config[self.name]
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if not self.template_funcs:
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self.template_funcs = {}
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if not self.template_fields:
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self.template_fields = {}
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if not self.album_template_fields:
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self.album_template_fields = {}
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self.early_import_stages = []
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self.import_stages = []
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self._log = log.getChild(self.name)
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self._log.setLevel(logging.NOTSET) # Use `beets` logger level.
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if not any(isinstance(f, PluginLogFilter) for f in self._log.filters):
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self._log.addFilter(PluginLogFilter(self))
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def commands(self):
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"""Should return a list of beets.ui.Subcommand objects for
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commands that should be added to beets' CLI.
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"""
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return ()
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def _set_stage_log_level(self, stages):
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"""Adjust all the stages in `stages` to WARNING logging level.
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"""
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return [self._set_log_level_and_params(logging.WARNING, stage)
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for stage in stages]
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def get_early_import_stages(self):
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"""Return a list of functions that should be called as importer
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pipelines stages early in the pipeline.
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The callables are wrapped versions of the functions in
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`self.early_import_stages`. Wrapping provides some bookkeeping for the
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plugin: specifically, the logging level is adjusted to WARNING.
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"""
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return self._set_stage_log_level(self.early_import_stages)
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def get_import_stages(self):
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"""Return a list of functions that should be called as importer
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pipelines stages.
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The callables are wrapped versions of the functions in
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`self.import_stages`. Wrapping provides some bookkeeping for the
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plugin: specifically, the logging level is adjusted to WARNING.
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"""
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return self._set_stage_log_level(self.import_stages)
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def _set_log_level_and_params(self, base_log_level, func):
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"""Wrap `func` to temporarily set this plugin's logger level to
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`base_log_level` + config options (and restore it to its previous
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value after the function returns). Also determines which params may not
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be sent for backwards-compatibility.
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"""
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if six.PY2:
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func_args = inspect.getargspec(func).args
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else:
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func_args = inspect.getfullargspec(func).args
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@wraps(func)
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def wrapper(*args, **kwargs):
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assert self._log.level == logging.NOTSET
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verbosity = beets.config['verbose'].get(int)
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log_level = max(logging.DEBUG, base_log_level - 10 * verbosity)
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self._log.setLevel(log_level)
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try:
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try:
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return func(*args, **kwargs)
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except TypeError as exc:
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if exc.args[0].startswith(func.__name__):
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# caused by 'func' and not stuff internal to 'func'
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kwargs = dict((arg, val) for arg, val in kwargs.items()
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if arg in func_args)
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return func(*args, **kwargs)
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else:
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raise
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finally:
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self._log.setLevel(logging.NOTSET)
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return wrapper
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def queries(self):
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"""Should return a dict mapping prefixes to Query subclasses.
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"""
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return {}
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def track_distance(self, item, info):
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"""Should return a Distance object to be added to the
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distance for every track comparison.
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"""
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return beets.autotag.hooks.Distance()
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def album_distance(self, items, album_info, mapping):
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"""Should return a Distance object to be added to the
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distance for every album-level comparison.
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"""
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return beets.autotag.hooks.Distance()
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def candidates(self, items, artist, album, va_likely, extra_tags=None):
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"""Should return a sequence of AlbumInfo objects that match the
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album whose items are provided.
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"""
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return ()
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def item_candidates(self, item, artist, title):
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"""Should return a sequence of TrackInfo objects that match the
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item provided.
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"""
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return ()
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def album_for_id(self, album_id):
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"""Return an AlbumInfo object or None if no matching release was
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found.
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"""
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return None
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def track_for_id(self, track_id):
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"""Return a TrackInfo object or None if no matching release was
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found.
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"""
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return None
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def add_media_field(self, name, descriptor):
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"""Add a field that is synchronized between media files and items.
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When a media field is added ``item.write()`` will set the name
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property of the item's MediaFile to ``item[name]`` and save the
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changes. Similarly ``item.read()`` will set ``item[name]`` to
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the value of the name property of the media file.
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``descriptor`` must be an instance of ``mediafile.MediaField``.
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"""
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# Defer import to prevent circular dependency
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from beets import library
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mediafile.MediaFile.add_field(name, descriptor)
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library.Item._media_fields.add(name)
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_raw_listeners = None
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listeners = None
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def register_listener(self, event, func):
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"""Add a function as a listener for the specified event.
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"""
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wrapped_func = self._set_log_level_and_params(logging.WARNING, func)
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cls = self.__class__
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if cls.listeners is None or cls._raw_listeners is None:
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cls._raw_listeners = defaultdict(list)
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cls.listeners = defaultdict(list)
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if func not in cls._raw_listeners[event]:
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cls._raw_listeners[event].append(func)
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cls.listeners[event].append(wrapped_func)
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template_funcs = None
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template_fields = None
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album_template_fields = None
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@classmethod
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def template_func(cls, name):
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"""Decorator that registers a path template function. The
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function will be invoked as ``%name{}`` from path format
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strings.
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"""
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def helper(func):
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if cls.template_funcs is None:
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cls.template_funcs = {}
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cls.template_funcs[name] = func
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return func
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return helper
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@classmethod
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def template_field(cls, name):
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"""Decorator that registers a path template field computation.
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The value will be referenced as ``$name`` from path format
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strings. The function must accept a single parameter, the Item
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being formatted.
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"""
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def helper(func):
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if cls.template_fields is None:
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cls.template_fields = {}
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cls.template_fields[name] = func
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return func
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return helper
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_classes = set()
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def load_plugins(names=()):
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"""Imports the modules for a sequence of plugin names. Each name
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must be the name of a Python module under the "beetsplug" namespace
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package in sys.path; the module indicated should contain the
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BeetsPlugin subclasses desired.
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"""
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for name in names:
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modname = '{0}.{1}'.format(PLUGIN_NAMESPACE, name)
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try:
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try:
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namespace = __import__(modname, None, None)
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except ImportError as exc:
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# Again, this is hacky:
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if exc.args[0].endswith(' ' + name):
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log.warning(u'** plugin {0} not found', name)
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else:
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raise
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else:
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for obj in getattr(namespace, name).__dict__.values():
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if isinstance(obj, type) and issubclass(obj, BeetsPlugin) \
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and obj != BeetsPlugin and obj not in _classes:
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_classes.add(obj)
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except Exception:
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log.warning(
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u'** error loading plugin {}:\n{}',
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name,
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traceback.format_exc(),
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)
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_instances = {}
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def find_plugins():
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"""Returns a list of BeetsPlugin subclass instances from all
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currently loaded beets plugins. Loads the default plugin set
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first.
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"""
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load_plugins()
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plugins = []
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for cls in _classes:
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# Only instantiate each plugin class once.
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if cls not in _instances:
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_instances[cls] = cls()
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plugins.append(_instances[cls])
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return plugins
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# Communication with plugins.
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def commands():
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"""Returns a list of Subcommand objects from all loaded plugins.
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"""
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out = []
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for plugin in find_plugins():
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out += plugin.commands()
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return out
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def queries():
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"""Returns a dict mapping prefix strings to Query subclasses all loaded
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plugins.
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"""
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out = {}
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for plugin in find_plugins():
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out.update(plugin.queries())
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return out
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def types(model_cls):
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# Gives us `item_types` and `album_types`
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attr_name = '{0}_types'.format(model_cls.__name__.lower())
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types = {}
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for plugin in find_plugins():
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plugin_types = getattr(plugin, attr_name, {})
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for field in plugin_types:
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if field in types and plugin_types[field] != types[field]:
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raise PluginConflictException(
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u'Plugin {0} defines flexible field {1} '
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u'which has already been defined with '
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u'another type.'.format(plugin.name, field)
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)
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types.update(plugin_types)
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return types
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def named_queries(model_cls):
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# Gather `item_queries` and `album_queries` from the plugins.
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attr_name = '{0}_queries'.format(model_cls.__name__.lower())
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queries = {}
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for plugin in find_plugins():
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plugin_queries = getattr(plugin, attr_name, {})
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queries.update(plugin_queries)
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return queries
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def track_distance(item, info):
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"""Gets the track distance calculated by all loaded plugins.
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Returns a Distance object.
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"""
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from beets.autotag.hooks import Distance
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dist = Distance()
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for plugin in find_plugins():
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dist.update(plugin.track_distance(item, info))
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return dist
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def album_distance(items, album_info, mapping):
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"""Returns the album distance calculated by plugins."""
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from beets.autotag.hooks import Distance
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dist = Distance()
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for plugin in find_plugins():
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dist.update(plugin.album_distance(items, album_info, mapping))
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return dist
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def candidates(items, artist, album, va_likely, extra_tags=None):
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"""Gets MusicBrainz candidates for an album from each plugin.
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"""
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for plugin in find_plugins():
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for candidate in plugin.candidates(items, artist, album, va_likely,
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extra_tags):
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yield candidate
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def item_candidates(item, artist, title):
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"""Gets MusicBrainz candidates for an item from the plugins.
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"""
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for plugin in find_plugins():
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for item_candidate in plugin.item_candidates(item, artist, title):
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yield item_candidate
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def album_for_id(album_id):
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"""Get AlbumInfo objects for a given ID string.
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"""
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for plugin in find_plugins():
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album = plugin.album_for_id(album_id)
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if album:
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yield album
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def track_for_id(track_id):
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"""Get TrackInfo objects for a given ID string.
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"""
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for plugin in find_plugins():
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track = plugin.track_for_id(track_id)
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if track:
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yield track
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def template_funcs():
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"""Get all the template functions declared by plugins as a
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dictionary.
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"""
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funcs = {}
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for plugin in find_plugins():
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if plugin.template_funcs:
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funcs.update(plugin.template_funcs)
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return funcs
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def early_import_stages():
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"""Get a list of early import stage functions defined by plugins."""
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stages = []
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for plugin in find_plugins():
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stages += plugin.get_early_import_stages()
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return stages
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def import_stages():
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"""Get a list of import stage functions defined by plugins."""
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stages = []
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for plugin in find_plugins():
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stages += plugin.get_import_stages()
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return stages
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# New-style (lazy) plugin-provided fields.
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def item_field_getters():
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"""Get a dictionary mapping field names to unary functions that
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compute the field's value.
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"""
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funcs = {}
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for plugin in find_plugins():
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if plugin.template_fields:
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funcs.update(plugin.template_fields)
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return funcs
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def album_field_getters():
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"""As above, for album fields.
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"""
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funcs = {}
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for plugin in find_plugins():
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if plugin.album_template_fields:
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funcs.update(plugin.album_template_fields)
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return funcs
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# Event dispatch.
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def event_handlers():
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"""Find all event handlers from plugins as a dictionary mapping
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event names to sequences of callables.
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"""
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all_handlers = defaultdict(list)
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for plugin in find_plugins():
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if plugin.listeners:
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for event, handlers in plugin.listeners.items():
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all_handlers[event] += handlers
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return all_handlers
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def send(event, **arguments):
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"""Send an event to all assigned event listeners.
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`event` is the name of the event to send, all other named arguments
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are passed along to the handlers.
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Return a list of non-None values returned from the handlers.
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"""
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log.debug(u'Sending event: {0}', event)
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results = []
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for handler in event_handlers()[event]:
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result = handler(**arguments)
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if result is not None:
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results.append(result)
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return results
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def feat_tokens(for_artist=True):
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"""Return a regular expression that matches phrases like "featuring"
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that separate a main artist or a song title from secondary artists.
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The `for_artist` option determines whether the regex should be
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suitable for matching artist fields (the default) or title fields.
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"""
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feat_words = ['ft', 'featuring', 'feat', 'feat.', 'ft.']
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if for_artist:
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feat_words += ['with', 'vs', 'and', 'con', '&']
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return r'(?<=\s)(?:{0})(?=\s)'.format(
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'|'.join(re.escape(x) for x in feat_words)
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)
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def sanitize_choices(choices, choices_all):
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"""Clean up a stringlist configuration attribute: keep only choices
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elements present in choices_all, remove duplicate elements, expand '*'
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wildcard while keeping original stringlist order.
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"""
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seen = set()
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others = [x for x in choices_all if x not in choices]
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res = []
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for s in choices:
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if s not in seen:
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if s in list(choices_all):
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res.append(s)
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elif s == '*':
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res.extend(others)
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seen.add(s)
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return res
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def sanitize_pairs(pairs, pairs_all):
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"""Clean up a single-element mapping configuration attribute as returned
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by Confuse's `Pairs` template: keep only two-element tuples present in
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pairs_all, remove duplicate elements, expand ('str', '*') and ('*', '*')
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wildcards while keeping the original order. Note that ('*', '*') and
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('*', 'whatever') have the same effect.
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For example,
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>>> sanitize_pairs(
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... [('foo', 'baz bar'), ('key', '*'), ('*', '*')],
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... [('foo', 'bar'), ('foo', 'baz'), ('foo', 'foobar'),
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... ('key', 'value')]
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... )
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[('foo', 'baz'), ('foo', 'bar'), ('key', 'value'), ('foo', 'foobar')]
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"""
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pairs_all = list(pairs_all)
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seen = set()
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others = [x for x in pairs_all if x not in pairs]
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res = []
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for k, values in pairs:
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for v in values.split():
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x = (k, v)
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if x in pairs_all:
|
|
if x not in seen:
|
|
seen.add(x)
|
|
res.append(x)
|
|
elif k == '*':
|
|
new = [o for o in others if o not in seen]
|
|
seen.update(new)
|
|
res.extend(new)
|
|
elif v == '*':
|
|
new = [o for o in others if o not in seen and o[0] == k]
|
|
seen.update(new)
|
|
res.extend(new)
|
|
return res
|
|
|
|
|
|
def notify_info_yielded(event):
|
|
"""Makes a generator send the event 'event' every time it yields.
|
|
This decorator is supposed to decorate a generator, but any function
|
|
returning an iterable should work.
|
|
Each yielded value is passed to plugins using the 'info' parameter of
|
|
'send'.
|
|
"""
|
|
def decorator(generator):
|
|
def decorated(*args, **kwargs):
|
|
for v in generator(*args, **kwargs):
|
|
send(event, info=v)
|
|
yield v
|
|
return decorated
|
|
return decorator
|
|
|
|
|
|
def get_distance(config, data_source, info):
|
|
"""Returns the ``data_source`` weight and the maximum source weight
|
|
for albums or individual tracks.
|
|
"""
|
|
dist = beets.autotag.Distance()
|
|
if info.data_source == data_source:
|
|
dist.add('source', config['source_weight'].as_number())
|
|
return dist
|
|
|
|
|
|
def apply_item_changes(lib, item, move, pretend, write):
|
|
"""Store, move, and write the item according to the arguments.
|
|
|
|
:param lib: beets library.
|
|
:type lib: beets.library.Library
|
|
:param item: Item whose changes to apply.
|
|
:type item: beets.library.Item
|
|
:param move: Move the item if it's in the library.
|
|
:type move: bool
|
|
:param pretend: Return without moving, writing, or storing the item's
|
|
metadata.
|
|
:type pretend: bool
|
|
:param write: Write the item's metadata to its media file.
|
|
:type write: bool
|
|
"""
|
|
if pretend:
|
|
return
|
|
|
|
from beets import util
|
|
|
|
# Move the item if it's in the library.
|
|
if move and lib.directory in util.ancestry(item.path):
|
|
item.move(with_album=False)
|
|
|
|
if write:
|
|
item.try_write()
|
|
|
|
item.store()
|
|
|
|
|
|
@six.add_metaclass(abc.ABCMeta)
|
|
class MetadataSourcePlugin(object):
|
|
def __init__(self):
|
|
super(MetadataSourcePlugin, self).__init__()
|
|
self.config.add({'source_weight': 0.5})
|
|
|
|
@abc.abstractproperty
|
|
def id_regex(self):
|
|
raise NotImplementedError
|
|
|
|
@abc.abstractproperty
|
|
def data_source(self):
|
|
raise NotImplementedError
|
|
|
|
@abc.abstractproperty
|
|
def search_url(self):
|
|
raise NotImplementedError
|
|
|
|
@abc.abstractproperty
|
|
def album_url(self):
|
|
raise NotImplementedError
|
|
|
|
@abc.abstractproperty
|
|
def track_url(self):
|
|
raise NotImplementedError
|
|
|
|
@abc.abstractmethod
|
|
def _search_api(self, query_type, filters, keywords=''):
|
|
raise NotImplementedError
|
|
|
|
@abc.abstractmethod
|
|
def album_for_id(self, album_id):
|
|
raise NotImplementedError
|
|
|
|
@abc.abstractmethod
|
|
def track_for_id(self, track_id=None, track_data=None):
|
|
raise NotImplementedError
|
|
|
|
@staticmethod
|
|
def get_artist(artists, id_key='id', name_key='name'):
|
|
"""Returns an artist string (all artists) and an artist_id (the main
|
|
artist) for a list of artist object dicts.
|
|
|
|
For each artist, this function moves articles (such as 'a', 'an',
|
|
and 'the') to the front and strips trailing disambiguation numbers. It
|
|
returns a tuple containing the comma-separated string of all
|
|
normalized artists and the ``id`` of the main/first artist.
|
|
|
|
:param artists: Iterable of artist dicts or lists returned by API.
|
|
:type artists: list[dict] or list[list]
|
|
:param id_key: Key or index corresponding to the value of ``id`` for
|
|
the main/first artist. Defaults to 'id'.
|
|
:type id_key: str or int
|
|
:param name_key: Key or index corresponding to values of names
|
|
to concatenate for the artist string (containing all artists).
|
|
Defaults to 'name'.
|
|
:type name_key: str or int
|
|
:return: Normalized artist string.
|
|
:rtype: str
|
|
"""
|
|
artist_id = None
|
|
artist_names = []
|
|
for artist in artists:
|
|
if not artist_id:
|
|
artist_id = artist[id_key]
|
|
name = artist[name_key]
|
|
# Strip disambiguation number.
|
|
name = re.sub(r' \(\d+\)$', '', name)
|
|
# Move articles to the front.
|
|
name = re.sub(r'^(.*?), (a|an|the)$', r'\2 \1', name, flags=re.I)
|
|
artist_names.append(name)
|
|
artist = ', '.join(artist_names).replace(' ,', ',') or None
|
|
return artist, artist_id
|
|
|
|
def _get_id(self, url_type, id_):
|
|
"""Parse an ID from its URL if necessary.
|
|
|
|
:param url_type: Type of URL. Either 'album' or 'track'.
|
|
:type url_type: str
|
|
:param id_: Album/track ID or URL.
|
|
:type id_: str
|
|
:return: Album/track ID.
|
|
:rtype: str
|
|
"""
|
|
self._log.debug(
|
|
u"Searching {} for {} '{}'", self.data_source, url_type, id_
|
|
)
|
|
match = re.search(self.id_regex['pattern'].format(url_type), str(id_))
|
|
if match:
|
|
id_ = match.group(self.id_regex['match_group'])
|
|
if id_:
|
|
return id_
|
|
return None
|
|
|
|
def candidates(self, items, artist, album, va_likely):
|
|
"""Returns a list of AlbumInfo objects for Search API results
|
|
matching an ``album`` and ``artist`` (if not various).
|
|
|
|
:param items: List of items comprised by an album to be matched.
|
|
:type items: list[beets.library.Item]
|
|
:param artist: The artist of the album to be matched.
|
|
:type artist: str
|
|
:param album: The name of the album to be matched.
|
|
:type album: str
|
|
:param va_likely: True if the album to be matched likely has
|
|
Various Artists.
|
|
:type va_likely: bool
|
|
:return: Candidate AlbumInfo objects.
|
|
:rtype: list[beets.autotag.hooks.AlbumInfo]
|
|
"""
|
|
query_filters = {'album': album}
|
|
if not va_likely:
|
|
query_filters['artist'] = artist
|
|
results = self._search_api(query_type='album', filters=query_filters)
|
|
albums = [self.album_for_id(album_id=r['id']) for r in results]
|
|
return [a for a in albums if a is not None]
|
|
|
|
def item_candidates(self, item, artist, title):
|
|
"""Returns a list of TrackInfo objects for Search API results
|
|
matching ``title`` and ``artist``.
|
|
|
|
:param item: Singleton item to be matched.
|
|
:type item: beets.library.Item
|
|
:param artist: The artist of the track to be matched.
|
|
:type artist: str
|
|
:param title: The title of the track to be matched.
|
|
:type title: str
|
|
:return: Candidate TrackInfo objects.
|
|
:rtype: list[beets.autotag.hooks.TrackInfo]
|
|
"""
|
|
tracks = self._search_api(
|
|
query_type='track', keywords=title, filters={'artist': artist}
|
|
)
|
|
return [self.track_for_id(track_data=track) for track in tracks]
|
|
|
|
def album_distance(self, items, album_info, mapping):
|
|
return get_distance(
|
|
data_source=self.data_source, info=album_info, config=self.config
|
|
)
|
|
|
|
def track_distance(self, item, track_info):
|
|
return get_distance(
|
|
data_source=self.data_source, info=track_info, config=self.config
|
|
)
|