view mercurial/typelib.py @ 50394:7a017cd07a1e

strip: explicitly compute the boundary of the backup bundle

We want to make change to the set of backed up revision in a future changeset,
we start with a change of the computation without any changes in the semantic
to clarify later changeset.

The could of costly assert are here to testify that the result is still
correct. They will be removed in the next changesets, but I wanted them in this
changeset to help in case someone bisect a regression to this changeset in the
future.

# typelib.py - type hint aliases and support
#
# Copyright 2022 Matt Harbison <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

import typing

# Note: this is slightly different from pycompat.TYPE_CHECKING, as using
# pycompat causes the BinaryIO_Proxy type to be resolved to ``object`` when
# used as the base class during a pytype run.
TYPE_CHECKING = typing.TYPE_CHECKING


# The BinaryIO class provides empty methods, which at runtime means that
# ``__getattr__`` on the proxy classes won't get called for the methods that
# should delegate to the internal object.  So to avoid runtime changes because
# of the required typing inheritance, just use BinaryIO when typechecking, and
# ``object`` otherwise.
if TYPE_CHECKING:
    from typing import (
        BinaryIO,
    )

    BinaryIO_Proxy = BinaryIO
else:
    BinaryIO_Proxy = object