mercurial/diffutil.py

rewriteutil: check for divergence

This code is adapted from the code in the evolve extension. It seems
to be equivalent as far as the evolve extension's test suite can tell
(the only impact when making their `precheck()` delegate to our
version is that error messages are less detailed).

I had to change the error message to work with "change branch of"
being inserted as the action.

Differential Revision: https://phab.mercurial-scm.org/D10518

# diffutil.py - utility functions related to diff and patch
#
# Copyright 2006 Brendan Cully <[e-mail]>
# Copyright 2007 Chris Mason <[e-mail]>
# Copyright 2018 Octobus <[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 .i18n import _

from . import (
    mdiff,
    pycompat,
)


def diffallopts(
    ui, opts=None, untrusted=False, section=b'diff', configprefix=b''
):
    '''return diffopts with all features supported and parsed'''
    return difffeatureopts(
        ui,
        opts=opts,
        untrusted=untrusted,
        section=section,
        git=True,
        whitespace=True,
        formatchanging=True,
        configprefix=configprefix,
    )


def difffeatureopts(
    ui,
    opts=None,
    untrusted=False,
    section=b'diff',
    git=False,
    whitespace=False,
    formatchanging=False,
    configprefix=b'',
):
    """return diffopts with only opted-in features parsed

    Features:
    - git: git-style diffs
    - whitespace: whitespace options like ignoreblanklines and ignorews
    - formatchanging: options that will likely break or cause correctness issues
      with most diff parsers
    """

    def get(key, name=None, getter=ui.configbool, forceplain=None):
        if opts:
            v = opts.get(key)
            # diffopts flags are either None-default (which is passed
            # through unchanged, so we can identify unset values), or
            # some other falsey default (eg --unified, which defaults
            # to an empty string). We only want to override the config
            # entries from hgrc with command line values if they
            # appear to have been set, which is any truthy value,
            # True, or False.
            if v or isinstance(v, bool):
                return v
        if forceplain is not None and ui.plain():
            return forceplain
        return getter(
            section, configprefix + (name or key), untrusted=untrusted
        )

    # core options, expected to be understood by every diff parser
    buildopts = {
        b'nodates': get(b'nodates'),
        b'showfunc': get(b'show_function', b'showfunc'),
        b'context': get(b'unified', getter=ui.config),
    }
    buildopts[b'xdiff'] = ui.configbool(b'experimental', b'xdiff')

    if git:
        buildopts[b'git'] = get(b'git')

        # since this is in the experimental section, we need to call
        # ui.configbool directory
        buildopts[b'showsimilarity'] = ui.configbool(
            b'experimental', b'extendedheader.similarity'
        )

        # need to inspect the ui object instead of using get() since we want to
        # test for an int
        hconf = ui.config(b'experimental', b'extendedheader.index')
        if hconf is not None:
            hlen = None
            try:
                # the hash config could be an integer (for length of hash) or a
                # word (e.g. short, full, none)
                hlen = int(hconf)
                if hlen < 0 or hlen > 40:
                    msg = _(b"invalid length for extendedheader.index: '%d'\n")
                    ui.warn(msg % hlen)
            except ValueError:
                # default value
                if hconf == b'short' or hconf == b'':
                    hlen = 12
                elif hconf == b'full':
                    hlen = 40
                elif hconf != b'none':
                    msg = _(b"invalid value for extendedheader.index: '%s'\n")
                    ui.warn(msg % hconf)
            finally:
                buildopts[b'index'] = hlen

    if whitespace:
        buildopts[b'ignorews'] = get(b'ignore_all_space', b'ignorews')
        buildopts[b'ignorewsamount'] = get(
            b'ignore_space_change', b'ignorewsamount'
        )
        buildopts[b'ignoreblanklines'] = get(
            b'ignore_blank_lines', b'ignoreblanklines'
        )
        buildopts[b'ignorewseol'] = get(b'ignore_space_at_eol', b'ignorewseol')
    if formatchanging:
        buildopts[b'text'] = opts and opts.get(b'text')
        binary = None if opts is None else opts.get(b'binary')
        buildopts[b'nobinary'] = (
            not binary
            if binary is not None
            else get(b'nobinary', forceplain=False)
        )
        buildopts[b'noprefix'] = get(b'noprefix', forceplain=False)
        buildopts[b'worddiff'] = get(
            b'word_diff', b'word-diff', forceplain=False
        )

    return mdiff.diffopts(**pycompat.strkwargs(buildopts))