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59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
5 years ago
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from __future__ import absolute_import, unicode_literals
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import sys
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from collections import OrderedDict
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if sys.version_info >= (3, 8):
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from importlib.metadata import entry_points
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else:
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from importlib_metadata import entry_points
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class PluginLoader(object):
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_OPTIONS = None
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_ENTRY_POINTS = None
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@classmethod
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def entry_points_for(cls, key):
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return OrderedDict((e.name, e.load()) for e in cls.entry_points().get(key, {}))
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@staticmethod
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def entry_points():
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if PluginLoader._ENTRY_POINTS is None:
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PluginLoader._ENTRY_POINTS = entry_points()
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return PluginLoader._ENTRY_POINTS
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class ComponentBuilder(PluginLoader):
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def __init__(self, interpreter, parser, name, possible):
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self.interpreter = interpreter
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self.name = name
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self._impl_class = None
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self.possible = possible
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self.parser = parser.add_argument_group(title=name)
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self.add_selector_arg_parse(name, list(self.possible))
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@classmethod
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def options(cls, key):
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if cls._OPTIONS is None:
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cls._OPTIONS = cls.entry_points_for(key)
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return cls._OPTIONS
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def add_selector_arg_parse(self, name, choices):
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raise NotImplementedError
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def handle_selected_arg_parse(self, options):
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selected = getattr(options, self.name)
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if selected not in self.possible:
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raise RuntimeError("No implementation for {}".format(self.interpreter))
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self._impl_class = self.possible[selected]
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self.populate_selected_argparse(selected, options.app_data)
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return selected
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def populate_selected_argparse(self, selected, app_data):
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self.parser.description = "options for {} {}".format(self.name, selected)
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self._impl_class.add_parser_arguments(self.parser, self.interpreter, app_data)
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def create(self, options):
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return self._impl_class(options, self.interpreter)
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