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57 lines
1.7 KiB
57 lines
1.7 KiB
import importlib
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PLUGIN_NAMESPACE = 'plugs'
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_classes = []
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_instances = {}
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class PapersPlugin(object):
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"""The base class for all plugins. Plugins provide
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functionality by defining a subclass of PapersPlugin and overriding
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the abstract methods defined here.
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"""
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name = None
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def get_commands(self, subparsers):
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"""Populates the parser with plugins specific command.
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Returns iterable of pairs (command name, command function to call).
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"""
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return []
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@classmethod
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def get_instance(cls):
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if cls in _instances:
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return _instances[cls]
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else:
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raise RuntimeError("{} instance not created".format(cls.__name__))
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def load_plugins(ui, names):
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"""Imports the modules for a sequence of plugin names. Each name
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must be the name of a Python module under the "PLUGIN_NAMESPACE" namespace
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package in sys.path; the module indicated should contain the
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PapersPlugin subclasses desired.
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"""
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for name in names:
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modname = '%s.%s.%s.%s' % ('papers', PLUGIN_NAMESPACE, name, name)
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try:
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namespace = importlib.import_module(modname)
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except ImportError as exc:
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# Again, this is hacky:
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if exc.args[0].endswith(' ' + name):
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ui.warning('plugin {} not found'.format(name))
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else:
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raise
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else:
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for obj in namespace.__dict__.values():
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if isinstance(obj, type) and issubclass(obj, PapersPlugin) \
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and obj != PapersPlugin:
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_classes.append(obj)
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_instances[obj] = obj()
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def get_plugins():
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return _instances
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