mirror of
https://github.com/beetbox/beets.git
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f871ef9e21
This restores the -v flag affecting plugins. By default, plugin loggers use the NOTSET level, which just reuses the base `beets` logger level. The level is only auto-adjusted for the importer when not in verbose mode.
469 lines
14 KiB
Python
Executable file
469 lines
14 KiB
Python
Executable file
# This file is part of beets.
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# Copyright 2015, 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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import traceback
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import inspect
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import re
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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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from beets import mediafile
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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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# 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.import_stages = []
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logger_name = '{0}.{1}'.format('beets', self.name)
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self._log = logging.getLogger(logger_name)
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self._log.setLevel(logging.NOTSET) # Use `beets` logger level.
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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 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_log_level(logging.WARNING, import_stage)
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for import_stage in self.import_stages]
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def _set_log_level(self, log_level, func):
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"""Wrap `func` to temporarily set this plugin's logger level to
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`log_level` (and restore it after the function returns).
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The level is *not* adjusted when beets is in verbose
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mode---i.e., the plugin logger continues to delegate to the base
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beets logger.
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"""
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@wraps(func)
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def wrapper(*args, **kwargs):
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if not beets.config['verbose']:
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old_log_level = self._log.level
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self._log.setLevel(log_level)
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result = func(*args, **kwargs)
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if not beets.config['verbose']:
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self._log.setLevel(old_log_level)
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return result
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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):
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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 impor 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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listeners = None
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@classmethod
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def register_listener(cls, event, func):
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"""Add a function as a listener for the specified event. (An
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imperative alternative to the @listen decorator.)
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"""
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if cls.listeners is None:
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cls.listeners = defaultdict(list)
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cls.listeners[event].append(func)
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@classmethod
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def listen(cls, event):
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"""Decorator that adds a function as an event handler for the
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specified event (as a string). The parameters passed to function
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will vary depending on what event occurred.
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The function should respond to named parameters.
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function(**kwargs) will trap all arguments in a dictionary.
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Example:
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>>> @MyPlugin.listen("imported")
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>>> def importListener(**kwargs):
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... pass
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"""
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def helper(func):
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if cls.listeners is None:
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cls.listeners = defaultdict(list)
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cls.listeners[event].append(func)
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return func
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return helper
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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 = '%s.%s' % (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.warn(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:
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log.warn(u'** error loading plugin {0}', name)
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log.warn(traceback.format_exc())
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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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'which has already been defined with '
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'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 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):
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"""Gets MusicBrainz candidates for an album from each plugin.
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"""
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out = []
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for plugin in find_plugins():
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out.extend(plugin.candidates(items, artist, album, va_likely))
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return out
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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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out = []
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for plugin in find_plugins():
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out.extend(plugin.item_candidates(item, artist, title))
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return out
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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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out = []
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for plugin in find_plugins():
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res = plugin.album_for_id(album_id)
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if res:
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out.append(res)
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return out
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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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out = []
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for plugin in find_plugins():
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res = plugin.track_for_id(track_id)
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if res:
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out.append(res)
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return out
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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 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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"""Sends an event to all assigned event listeners. Event is the
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name of the event to send, all other named arguments go to the
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event handler(s).
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Returns a list of return values from the handlers.
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"""
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log.debug(u'Sending event: {0}', event)
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for handler in event_handlers()[event]:
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# Don't break legacy plugins if we want to pass more arguments
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argspec = inspect.getargspec(handler).args
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args = dict((k, v) for k, v in arguments.items() if k in argspec)
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handler(**args)
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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 '(?<=\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 in list(choices_all) + ['*']:
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if not (s in seen or seen.add(s)):
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res.extend(list(others) if s == '*' else [s])
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return res
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