hgext3rd/topic/destination.py
author Anton Shestakov <av6@dwimlabs.net>
Tue, 09 Jul 2019 17:08:34 +0800
changeset 4710 0e0731406efd
parent 4539 91628e5c0f6d
child 4814 48b30ff742cb
permissions -rw-r--r--
rewriteutil: allow rewriting merge commits (issue4561) This patch simply allows rewriteutil.rewrite() to work with commits with multiple parents (i.e. merges). That function is used in such commands as fold, metaedit, touch, rewind. The issue 4561 is marked as easy, the limitation is called unnecessary, no tests fail after this change. What can go wrong.

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial import (
    bookmarks,
    destutil,
    error,
    extensions,
)
from . import (
    common,
    topicmap,
)
from .evolvebits import builddependencies

def _destmergebranch(orig, repo, action='merge', sourceset=None,
                     onheadcheck=True, destspace=None):
    # XXX: take destspace into account
    if sourceset is None:
        p1 = repo['.']
    else:
        # XXX: using only the max here is flacky. That code should eventually
        # be updated to take care of the whole sourceset.
        p1 = repo[max(sourceset)]
    top = None
    if common.hastopicext(repo):
        top = p1.topic()
    if top:
        revs = repo.revs('topic(%s) - obsolete()', top)
        deps, rdeps = builddependencies(repo, revs)
        heads = [r for r in revs if not rdeps[r]]
        if onheadcheck and p1.rev() not in heads:
            raise error.Abort(_("not at topic head, update or explicit"))

        # prune heads above the source
        otherheads = set(heads)
        pool = set([p1.rev()])
        while pool:
            current = pool.pop()
            otherheads.discard(current)
            pool.update(rdeps[current])
        if not otherheads:
            # nothing to do at the topic level
            bhead = ngtip(repo, p1.branch(), all=True)
            if not bhead:
                raise error.NoMergeDestAbort(_("nothing to merge"))
            elif 1 == len(bhead):
                return bhead[0]
            else:
                msg = _("branch '%s' has %d heads "
                        "- please merge with an explicit rev")
                hint = _("run 'hg heads .' to see heads")
                raise error.ManyMergeDestAbort(msg % (p1.branch(), len(bhead)),
                                               hint=hint)
        elif len(otherheads) == 1:
            return otherheads.pop()
        else:
            msg = _("topic '%s' has %d heads "
                    "- please merge with an explicit rev") % (top, len(heads))
            raise error.ManyMergeDestAbort(msg)
    return orig(repo, action, sourceset, onheadcheck, destspace=destspace)

def _destupdatetopic(repo, clean, check=None):
    """decide on an update destination from current topic"""
    if not common.hastopicext(repo):
        return None, None, None
    movemark = node = None
    topic = repo.currenttopic
    if topic:
        revs = repo.revs('.::topic(%s)', topic)
    else:
        revs = []
    if not revs:
        return None, None, None
    node = revs.last()
    if bookmarks.isactivewdirparent(repo):
        movemark = repo['.'].node()
    return node, movemark, None

def desthistedit(orig, ui, repo):
    if not common.hastopicext(repo):
        return None
    if not (ui.config('histedit', 'defaultrev', None) is None
            and repo.currenttopic):
        return orig(ui, repo)
    revs = repo.revs('::. and stack()')
    if revs:
        return revs.min()
    return None

def ngtip(repo, branch, all=False):
    """tip new generation"""
    ## search for untopiced heads of branch
    # could be heads((::branch(x) - topic()))
    # but that is expensive
    #
    # we should write plain code instead

    tmap = topicmap.gettopicrepo(repo).branchmap()
    if branch not in tmap:
        return []
    elif all:
        return tmap.branchheads(branch)
    else:
        return [tmap.branchtip(branch)]

def modsetup(ui):
    """run a uisetup time to install all destinations wrapping"""
    extensions.wrapfunction(destutil, '_destmergebranch', _destmergebranch)
    bridx = destutil.destupdatesteps.index('branch')
    destutil.destupdatesteps.insert(bridx, 'topic')
    destutil.destupdatestepmap['topic'] = _destupdatetopic
    extensions.wrapfunction(destutil, 'desthistedit', desthistedit)