mirror of https://github.com/pypa/pip
37 lines
975 B
Python
37 lines
975 B
Python
from contextlib import contextmanager
|
|
|
|
from pip._vendor.contextlib2 import ExitStack
|
|
|
|
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
|
|
|
|
if MYPY_CHECK_RUNNING:
|
|
from typing import ContextManager, Iterator, TypeVar
|
|
|
|
_T = TypeVar('_T', covariant=True)
|
|
|
|
|
|
class CommandContextMixIn(object):
|
|
def __init__(self):
|
|
# type: () -> None
|
|
super(CommandContextMixIn, self).__init__()
|
|
self._in_main_context = False
|
|
self._main_context = ExitStack()
|
|
|
|
@contextmanager
|
|
def main_context(self):
|
|
# type: () -> Iterator[None]
|
|
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):
|
|
# type: (ContextManager[_T]) -> _T
|
|
assert self._in_main_context
|
|
|
|
return self._main_context.enter_context(context_provider)
|