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# Copyright (C) 2007-2017 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Style manager."""
from mailman.interfaces.configuration import ConfigurationUpdatedEvent
from mailman.interfaces.styles import (
DuplicateStyleError, IStyle, IStyleManager)
from mailman.utilities.modules import find_components
from public import public
from zope.component import getUtility
from zope.interface import implementer
from zope.interface.verify import verifyObject
@public
@implementer(IStyleManager)
class StyleManager:
"""The built-in style manager."""
def __init__(self):
"""Install all styles from the configuration files."""
self._styles = {}
def populate(self):
self._styles.clear()
# Avoid circular imports.
from mailman.config import config
# Calculate the Python import paths to search.
paths = filter(None, (path.strip()
for path in config.styles.paths.splitlines()))
for path in paths:
for style_class in find_components(path, IStyle):
style = style_class()
verifyObject(IStyle, style)
assert style.name not in self._styles, (
'Duplicate style "{}" found in {}'.format(
style.name, style_class))
self._styles[style.name] = style
def get(self, name):
"""See `IStyleManager`."""
return self._styles.get(name)
@property
def styles(self):
"""See `IStyleManager`."""
for style_name in sorted(self._styles):
yield self._styles[style_name]
def register(self, style):
"""See `IStyleManager`."""
verifyObject(IStyle, style)
if style.name in self._styles:
raise DuplicateStyleError(style.name)
self._styles[style.name] = style
def unregister(self, style):
"""See `IStyleManager`."""
# Let KeyErrors percolate up.
del self._styles[style.name]
@public
def handle_ConfigurationUpdatedEvent(event):
if isinstance(event, ConfigurationUpdatedEvent):
getUtility(IStyleManager).populate()
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