view hgext3rd/topic/destination.py @ 3623:71fbb679e311

evolve: use the new rebased changeset to resolve phase-divergence

When there is a parent change in phase-divergence, `hg evolve` first rebases the
diveregent changeset on parent of public changeset and then continue the
resolution of phase-divergence *but* we used to continue with the old divergent
changeset rather than the new rebased one.

This patch makes sure we use the new rebased changeset to proceed with the
resolution. Tests changes shows that it fixes things which were broken earlier.

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial import (
    bookmarks,
    destutil,
    error,
    extensions,
)
from . import 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 = 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"""
    movemark = node = None
    topic = repo.currenttopic
    revs = repo.revs('.::topic("%s")' % topic)
    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 (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)