+
−# rewriteutil.py - utility functions for rewriting changesets
+
−#
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−# Copyright 2017 Octobus <contact@octobus.net>
+
−#
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−# This software may be used and distributed according to the terms of the
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−# GNU General Public License version 2 or any later version.
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−
+
−from __future__ import absolute_import
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−
+
−from .i18n import _
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−
+
−from . import (
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−    error,
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−    node,
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−    obsolete,
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−    revset,
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−)
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−
+
−def precheck(repo, revs, action='rewrite'):
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−    """check if revs can be rewritten
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−    action is used to control the error message.
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−
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−    Make sure this function is called after taking the lock.
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−    """
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−    if node.nullrev in revs:
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−        msg = _("cannot %s null changeset") % (action)
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−        hint = _("no changeset checked out")
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−        raise error.Abort(msg, hint=hint)
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−
+
−    if len(repo[None].parents()) > 1:
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−        raise error.Abort(_("cannot %s while merging") % action)
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−
+
−    publicrevs = repo.revs('%ld and public()', revs)
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−    if publicrevs:
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−        msg = _("cannot %s public changesets") % (action)
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−        hint = _("see 'hg help phases' for details")
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−        raise error.Abort(msg, hint=hint)
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−
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−    newunstable = disallowednewunstable(repo, revs)
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−    if newunstable:
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−        raise error.Abort(_("cannot %s changeset with children") % action)
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−
+
−def disallowednewunstable(repo, revs):
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−    """Checks whether editing the revs will create new unstable changesets and
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−    are we allowed to create them.
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−
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−    To allow new unstable changesets, set the config:
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−        `experimental.evolution.allowunstable=True`
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−    """
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−    allowunstable = obsolete.isenabled(repo, obsolete.allowunstableopt)
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−    if allowunstable:
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−        return revset.baseset()
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−    return repo.revs("(%ld::) - %ld", revs, revs)