mercurial/revlogutils/flagutil.py

flagutil: create a `mercurial.revlogutils.flagutil` module

The flagprocessings logic is duplicated in 2 extra places, and usually in a less
robust flavor. This is a maintenance nightmare that I would like to see cleaned
up. To do so I am creating a `flagutil` module to move flag processings related
code and make it easily reusable by other code.

# flagutils.py - code to deal with revlog flags and their processors
#
# Copyright 2016 Remi Chaintron <[e-mail]>
# Copyright 2016-2019 Pierre-Yves David <[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.

from __future__ import absolute_import

from .constants import (
    REVIDX_DEFAULT_FLAGS,
    REVIDX_ELLIPSIS,
    REVIDX_EXTSTORED,
    REVIDX_FLAGS_ORDER,
    REVIDX_ISCENSORED,
    REVIDX_KNOWN_FLAGS,
    REVIDX_RAWTEXT_CHANGING_FLAGS,
)

# blanked usage of all the name to prevent pyflakes constraints
# We need these name available in the module for extensions.
REVIDX_ISCENSORED
REVIDX_ELLIPSIS
REVIDX_EXTSTORED
REVIDX_DEFAULT_FLAGS
REVIDX_FLAGS_ORDER
REVIDX_KNOWN_FLAGS
REVIDX_RAWTEXT_CHANGING_FLAGS