hgext/extdiff.py

37254:e9ee540af434

    if revs and change:
        msg = _('cannot specify --rev and --change at the same time')
        raise error.Abort(msg)
    elif change:
        node2 = scmutil.revsingle(repo, change, None).node()
        node1a, node1b = repo.changelog.parents(node2)
    else:
        node1a, node2 = scmutil.revpairnodes(repo, revs)
        if not revs:
            node1b = repo.dirstate.p2()
        else:
            node1b = nullid

    # Disable 3-way merge if there is only one parent
    if do3way:
        if node1b == nullid:
            do3way = False

37255:6089ef933ab5

    if revs and change:
        msg = _('cannot specify --rev and --change at the same time')
        raise error.Abort(msg)
    elif change:
        ctx2 = scmutil.revsingle(repo, change, None)
        ctx1a, ctx1b = ctx2.p1(), ctx2.p2()
    else:
        ctx1a, ctx2 = scmutil.revpair(repo, revs)
        if not revs:
            ctx1b = repo[None].p2()
        else:
            ctx1b = repo[nullid]

    node1a = ctx1a.node()
    node1b = ctx1b.node()
    node2 = ctx2.node()

    # Disable 3-way merge if there is only one parent
    if do3way:
        if node1b == nullid:
            do3way = False