# Extension dedicated to test patch.diff() upgrade modes

from __future__ import absolute_import

from mercurial import (

    error,

    patch,

    scmutil,

)

cmdtable = {}

@command('autodiff',

    [('', 'git', '', 'git upgrade mode (yes/no/auto/warn/abort)')],

    '[OPTION]... [FILE]...')

def autodiff(ui, repo, *pats, **opts):

    diffopts = patch.difffeatureopts(ui, opts)

    git = opts.get('git', 'no')

    brokenfiles = set()

    losedatafn = None

    if git in ('yes', 'no'):

        diffopts.git = git == 'yes'

        diffopts.upgrade = False

    elif git == 'auto':

        diffopts.git = False

        diffopts.upgrade = True

    elif git == 'warn':

        diffopts.git = False

        diffopts.upgrade = True

        def losedatafn(fn=None, **kwargs):

            brokenfiles.add(fn)

            return True

    elif git == 'abort':

        diffopts.git = False

        diffopts.upgrade = True

        def losedatafn(fn=None, **kwargs):

            raise error.Abort('losing data for %s' % fn)

    else:

        raise error.Abort('--git must be yes, no or auto')

    node1, node2 = scmutil.revpair(repo, [])

    m = scmutil.match(repo[node2], pats, opts)

    it = patch.diff(repo, node1, node2, match=m, opts=diffopts,

                    losedatafn=losedatafn)

    for chunk in it:

        ui.write(chunk)

    for fn in sorted(brokenfiles):

        ui.write(('data lost for: %s\n' % fn))