mirror of
https://github.com/beetbox/beets.git
synced 2025-12-06 08:39:17 +01:00
70 lines
2.3 KiB
Python
70 lines
2.3 KiB
Python
# This file is part of beets.
|
|
# Copyright 2011, Adrian Sampson.
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining
|
|
# a copy of this software and associated documentation files (the
|
|
# "Software"), to deal in the Software without restriction, including
|
|
# without limitation the rights to use, copy, modify, merge, publish,
|
|
# distribute, sublicense, and/or sell copies of the Software, and to
|
|
# permit persons to whom the Software is furnished to do so, subject to
|
|
# the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be
|
|
# included in all copies or substantial portions of the Software.
|
|
|
|
"""Allows inline path template customization code in the config file.
|
|
"""
|
|
import logging
|
|
import traceback
|
|
|
|
from beets.plugins import BeetsPlugin
|
|
from beets import config
|
|
|
|
log = logging.getLogger('beets')
|
|
|
|
class InlineError(Exception):
|
|
"""Raised when a runtime error occurs in an inline expression.
|
|
"""
|
|
def __init__(self, expr, exc):
|
|
super(InlineError, self).__init__(
|
|
(u"error in inline path field expression:\n" \
|
|
u"%s\n%s: %s") % (expr, type(exc).__name__, unicode(exc))
|
|
)
|
|
|
|
def compile_expr(expr):
|
|
"""Given a Python expression, compile it as a path field function.
|
|
The returned function takes a single argument, an Item, and returns
|
|
a Unicode string. If the expression cannot be compiled, then an
|
|
error is logged and this function returns None.
|
|
"""
|
|
try:
|
|
code = compile(u'(%s)' % expr, 'inline', 'eval')
|
|
except SyntaxError:
|
|
log.error(u'syntax error in field expression:\n%s' %
|
|
traceback.format_exc())
|
|
return None
|
|
|
|
def field_func(item):
|
|
values = dict(item.record)
|
|
try:
|
|
return eval(code, values)
|
|
except Exception as exc:
|
|
raise InlineError(expr, exc)
|
|
return field_func
|
|
|
|
class InlinePlugin(BeetsPlugin):
|
|
template_fields = {}
|
|
|
|
def __init__(self):
|
|
super(InlinePlugin, self).__init__()
|
|
|
|
config.add({
|
|
'pathfields': {},
|
|
})
|
|
|
|
# Add field expressions.
|
|
for key, view in config['pathfields'].items():
|
|
log.debug(u'adding template field %s' % key)
|
|
func = compile_expr(view.get(unicode))
|
|
if func is not None:
|
|
InlinePlugin.template_fields[key] = func
|