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authorBarry Warsaw2008-02-27 01:26:18 -0500
committerBarry Warsaw2008-02-27 01:26:18 -0500
commita1c73f6c305c7f74987d99855ba59d8fa823c253 (patch)
tree65696889450862357c9e05c8e9a589f1bdc074ac /Mailman/app/plugins.py
parent3f31f8cce369529d177cfb5a7c66346ec1e12130 (diff)
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diff --git a/Mailman/app/plugins.py b/Mailman/app/plugins.py
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-# Copyright (C) 2007-2008 by the Free Software Foundation, Inc.
-#
-# This program 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 2
-# of the License, or (at your option) any later version.
-#
-# This program 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 this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
-# USA.
-
-"""Get a requested plugin."""
-
-import pkg_resources
-
-
-
-def get_plugin(group):
- """Get the named plugin.
-
- In general, this returns exactly one plugin. If no plugins have been
- added to the named group, the 'stock' plugin will be used. If more than
- one plugin -- other than the stock one -- exists, an exception will be
- raised.
-
- :param group: The plugin group name.
- :return: The loaded plugin.
- :raises RuntimeError: If more than one plugin overrides the stock plugin
- for the named group.
- """
- entry_points = list(pkg_resources.iter_entry_points(group))
- if len(entry_points) == 0:
- raise RuntimeError('No entry points found for group: %s' % group)
- elif len(entry_points) == 1:
- # Okay, this is the one to use.
- return entry_points[0].load()
- elif len(entry_points) == 2:
- # Find the one /not/ named 'stock'.
- entry_points = [ep for ep in entry_points if ep.name <> 'stock']
- if len(entry_points) == 0:
- raise RuntimeError('No stock plugin found for group: %s' % group)
- elif len(entry_points) == 2:
- raise RuntimeError('Too many stock plugins defined')
- else:
- raise AssertionError('Insanity')
- return entry_points[0].load()
- else:
- raise RuntimeError('Too many plugins for group: %s' % group)
-
-
-
-def get_plugins(group):
- """Get and return all plugins in the named group.
-
- :param group: Plugin group name.
- :return: The loaded plugin.
- """
- for entry_point in pkg_resources.iter_entry_points(group):
- yield entry_point.load()