109 lines
3.4 KiB
Python
Executable File
109 lines
3.4 KiB
Python
Executable File
#!/usr/bin/python
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# Terminator by Chris Jones <cmsj@tenshu.net>
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# GPL v2 only
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"""plugin.py - Base plugin system
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Inspired by Armin Ronacher's post at
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http://lucumr.pocoo.org/2006/7/3/python-plugin-system
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Used with permission (the code in that post is to be
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considered BSD licenced, per the authors wishes)
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>>> registry = PluginRegistry()
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>>> registry.instances
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{}
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>>> registry.load_plugins()
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>>> plugins = registry.get_plugins_by_capability('test')
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>>> len(plugins)
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1
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>>> plugins[0] #doctest: +ELLIPSIS
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<testplugin.TestPlugin object at 0x...>
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>>> registry.get_plugins_by_capability('this_should_not_ever_exist')
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[]
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>>> plugins[0].do_test()
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'TestPluginWin'
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"""
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import sys
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import os
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import borg
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from util import dbg, err
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class Plugin(object):
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"""Definition of our base plugin class"""
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capabilities = None
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def __init__(self):
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"""Class initialiser."""
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pass
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class PluginRegistry(borg.Borg):
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"""Definition of a class to store plugin instances"""
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instances = None
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path = None
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done = None
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def __init__(self):
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"""Class initialiser"""
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borg.Borg.__init__(self)
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self.prepare_attributes()
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def prepare_attributes(self):
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"""Prepare our attributes"""
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if not self.instances:
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self.instances = {}
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if not self.path:
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(head, tail) = os.path.split(borg.__file__)
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# FIXME: self.path should really be a list so we can have something
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# in the users home directory
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self.path = os.path.join(head, 'plugins')
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dbg('PluginRegistry::prepare_attributes: Plugin path: %s' %
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self.path)
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if not self.done:
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self.done = False
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def load_plugins(self):
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"""Load all plugins present in the plugins/ directory in our module"""
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if self.done:
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dbg('PluginRegistry::load_plugins: Already loaded')
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return
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sys.path.insert(0, self.path)
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files = os.listdir(self.path)
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for plugin in files:
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pluginpath = os.path.join(self.path, plugin)
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if os.path.isfile(pluginpath) and plugin[-3:] == '.py':
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dbg('PluginRegistry::load_plugins: Importing plugin %s' %
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plugin)
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try:
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module = __import__(plugin[:-3], None, None, [''])
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for item in getattr(module, 'available'):
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if item not in self.instances:
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func = getattr(module, item)
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self.instances[item] = func()
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except Exception as e:
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err('PluginRegistry::load_plugins: Importing plugin %s \
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failed: %s' % (plugin, e))
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self.done = True
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def get_plugins_by_capability(self, capability):
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"""Return a list of plugins with a particular capability"""
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result = []
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dbg('PluginRegistry::get_plugins_by_capability: searching %d plugins \
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for %s' % (len(self.instances), capability))
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for plugin in self.instances:
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if capability in self.instances[plugin].capabilities:
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result.append(self.instances[plugin])
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return result
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def get_all_plugins(self):
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"""Return all plugins"""
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return(self.instances)
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if __name__ == '__main__':
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import doctest
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sys.path.insert(0, 'plugins')
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(failed, attempted) = doctest.testmod()
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print "%d/%d tests failed" % (failed, attempted)
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