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

from mercurial import (

    error,

    logcmdutil,

    patch,

    pycompat,

    registrar,

    scmutil,

)

cmdtable = {}

command = registrar.command(cmdtable)

@command(

    b'autodiff',

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

    b'[OPTION]... [FILE]...',

)

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

    opts = pycompat.byteskwargs(opts)

    diffopts = patch.difffeatureopts(ui, opts)

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

    brokenfiles = set()

    losedatafn = None

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

        diffopts.git = git == b'yes'

        diffopts.upgrade = False

    elif git == b'auto':

        diffopts.git = False

        diffopts.upgrade = True

    elif git == b'warn':

        diffopts.git = False

        diffopts.upgrade = True

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

            brokenfiles.add(fn)

            return True

    elif git == b'abort':

        diffopts.git = False

        diffopts.upgrade = True

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

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

    else:

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

    ctx1, ctx2 = logcmdutil.revpair(repo, [])

    m = scmutil.match(ctx2, pats, opts)

    it = patch.diff(

        repo,

        ctx1.node(),

        ctx2.node(),

        match=m,

        opts=diffopts,

        losedatafn=losedatafn,

    )

    for chunk in it:

        ui.write(chunk)

    for fn in sorted(brokenfiles):

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