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37 lines
975 B
37 lines
975 B
5 years ago
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from contextlib import contextmanager
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from pip._vendor.contextlib2 import ExitStack
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from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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if MYPY_CHECK_RUNNING:
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from typing import Iterator, ContextManager, TypeVar
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_T = TypeVar('_T', covariant=True)
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class CommandContextMixIn(object):
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def __init__(self):
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# type: () -> None
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super(CommandContextMixIn, self).__init__()
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self._in_main_context = False
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self._main_context = ExitStack()
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@contextmanager
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def main_context(self):
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# type: () -> Iterator[None]
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assert not self._in_main_context
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self._in_main_context = True
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try:
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with self._main_context:
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yield
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finally:
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self._in_main_context = False
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def enter_context(self, context_provider):
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# type: (ContextManager[_T]) -> _T
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assert self._in_main_context
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return self._main_context.enter_context(context_provider)
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