view hgext3rd/topic/destination.py @ 1911:442a7cb8404e

histedit: restrict default edited set to current topic when possible

If we have an active topic, we restrict the edit within that topic.

from mercurial import error
from mercurial import util
from mercurial import destutil
from mercurial import extensions
from mercurial import bookmarks
from mercurial.i18n import _

def _destmergebranch(orig, repo, action='merge', sourceset=None, onheadcheck=True):
    p1 = repo['.']
    top = p1.topic()
    if top:
        heads = repo.revs('heads(topic(.)::topic(.))')
        if p1.rev() not in heads:
            raise error.Abort(_("not at topic head, update or explicit"))
        elif 1 == len(heads):
            # should look at all branch involved but... later
            bhead = ngtip(repo, p1.branch(), all=True)
            if not bhead:
                raise error.Abort(_("nothing to merge"))
            elif 1 == len(bhead):
                return bhead.first()
            else:
                raise error.Abort(_("branch '%s' has %d heads - "
                                   "please merge with an explicit rev")
                                 % (p1.branch(), len(bhead)),
                                 hint=_("run 'hg heads .' to see heads"))
        elif 2 == len(heads):
            heads = [r for r in heads if r != p1.rev()]
            # XXX: bla bla bla bla bla
            if 1 < len(heads):
                raise error.Abort(_('working directory not at a head revision'),
                                 hint=_("use 'hg update' or merge with an "
                                        "explicit revision"))
            return heads[0]
        elif 2 < len(heads):
            raise error.Abort(_("topic '%s' has %d heads - "
                                "please merge with an explicit rev")
                              % (top, len(heads)))
        else:
            assert False # that's impossible
    if getattr(orig, 'func_default', ()): # version above hg-3.7
        return orig(repo, action, sourceset, onheadcheck)
    else:
        return orig(repo)

def _destupdatetopic(repo, clean, check):
    """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 setupdest():
    if util.safehasattr(destutil, '_destmergebranch'):
        extensions.wrapfunction(destutil, '_destmergebranch', _destmergebranch)
    rebase = extensions.find('rebase')
    if (util.safehasattr(rebase, '_destrebase')
            # logic not shared with merge yet < hg-3.8
            and not util.safehasattr(rebase, '_definesets')):
        extensions.wrapfunction(rebase, '_destrebase', _destmergebranch)
    if util.safehasattr(destutil, 'destupdatesteps'):
        bridx = destutil.destupdatesteps.index('branch')
        destutil.destupdatesteps.insert(bridx, 'topic')
        destutil.destupdatestepmap['topic'] = _destupdatetopic
    if util.safehasattr(destutil, 'desthistedit'):
        extensions.wrapfunction(destutil, 'desthistedit', desthistedit)

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
    subquery = '''heads(
                    parents(
                       ancestor(
                         (head() and branch(%s)
                         or (topic() and branch(%s)))))
                   ::(head() and branch(%s))
                   - topic())'''
    if not all:
        subquery = 'max(%s)' % subquery
    return repo.revs(subquery, branch, branch, branch)