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- # The following comment should be removed at some point in the future.
- # mypy: disallow-untyped-defs=False
- from contextlib import contextmanager
- from pip._vendor.contextlib2 import ExitStack
- class CommandContextMixIn(object):
- def __init__(self):
- super(CommandContextMixIn, self).__init__()
- self._in_main_context = False
- self._main_context = ExitStack()
- @contextmanager
- def main_context(self):
- assert not self._in_main_context
- self._in_main_context = True
- try:
- with self._main_context:
- yield
- finally:
- self._in_main_context = False
- def enter_context(self, context_provider):
- assert self._in_main_context
- return self._main_context.enter_context(context_provider)
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