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revlog: add a C implementation of `headrevsdiff`...

revlog: add a C implementation of `headrevsdiff` Python implementation of `headrevsdiff` can be very slow in the worst case compared with the `heads` computation it replaces, since the latter is done in C. Even the average case of this Python implementation is still noticeable in the profiles. This patch makes the computation much much faster by doing it in C.

Matt Harbison - - Load All Authors

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      # typelib.py - type hint aliases and support

      #

      # Copyright 2022 Matt Harbison <matt_harbison@yahoo.com>

      #

      # 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

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				# typelib.py - type hint aliases and support
				#
				# Copyright 2022 Matt Harbison <matt_harbison@yahoo.com>
				#
				# 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