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comparison lib/python3.8/site-packages/pip/_internal/cli/command_context.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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-1:000000000000 0:9e54283cc701
1 from contextlib import contextmanager
2
3 from pip._vendor.contextlib2 import ExitStack
4
5 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
6
7 if MYPY_CHECK_RUNNING:
8 from typing import Iterator, ContextManager, TypeVar
9
10 _T = TypeVar('_T', covariant=True)
11
12
13 class CommandContextMixIn(object):
14 def __init__(self):
15 # type: () -> None
16 super(CommandContextMixIn, self).__init__()
17 self._in_main_context = False
18 self._main_context = ExitStack()
19
20 @contextmanager
21 def main_context(self):
22 # type: () -> Iterator[None]
23 assert not self._in_main_context
24
25 self._in_main_context = True
26 try:
27 with self._main_context:
28 yield
29 finally:
30 self._in_main_context = False
31
32 def enter_context(self, context_provider):
33 # type: (ContextManager[_T]) -> _T
34 assert self._in_main_context
35
36 return self._main_context.enter_context(context_provider)