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#!/usr/bin/python2.5
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# -*- coding: utf-8 -*-
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# Mitter, a simple client for Twitter
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# Copyright (C) 2007, 2008 The Mitter Contributors
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import logging
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import os.path
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from mitterlib import module_search
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_log = logging.getLogger('mitterlib.ui.Interfaces')
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# List of files that are not networks
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SKIPPABLES = ('__init__.py')
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#--------------------------------------------------------------------
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# Helper functions
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#--------------------------------------------------------------------
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def _import_name(module):
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"""Based on the name of the module, return the proper "import"
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statement."""
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(name, _) = os.path.splitext(module)
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return 'mitterlib.ui.%s' % (name)
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class Interfaces(object):
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"""Interface transparency layer: Check which interfaces are available and
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tries to load the interface requested by the user."""
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def __init__(self, options):
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self._interfaces = []
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self._options = options
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self.options()
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return
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def options(self):
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"""Request all networks to add their options."""
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for module_name in module_search(__file__, SKIPPABLES):
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import_name = _import_name(module_name)
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try:
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_log.debug('Importing module %s', import_name)
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module = __import__(import_name, fromlist=[import_name])
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interface_name = module.Interface.NAMESPACE
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module.Interface.options(self._options)
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self._interfaces.append(interface_name)
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except ImportError, exc:
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_log.debug('Cannot import module %s', import_name)
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_log.debug(str(exc))
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return
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def load(self, connection, prefer=None):
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"""Start the interface, using the prefered one."""
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if not self._interfaces:
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return None
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if prefer and prefer in self._interfaces:
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import_name = prefer
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else:
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# So we pick the one in the top of the list ('cause we know it's
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# importable and the user didn't chose anything.)
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# [we could be mean and use random.choice(self._interfaces)]
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import_name = self._interfaces[0]
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module_name = _import_name(import_name)
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module = __import__(module_name, fromlist[module_name])
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return module.Interface(connection, self._options)
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