view hgext3rd/topic/destination.py @ 2653:13313d0cab71

topicmap: massive rework

Massively rework the way we build and use topicmap. This bring massive performance
benefit.

Topic map use to be a fully independant thing that we would switch on and off
globaly. The caching on disk was broken so the performance were atrocious.

Intead, now the topic are inherited from the 'immutable' map. We gave up on
storing them on disk for now since the mutable set is usually small enough.

The activation is done by hacking new "filter" on the repository and detection
when they are one. This is hacky but core is hard to wrap here.

Overall this whole wrapping is really scary and we should massage core API to
help it.

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial import (
    bookmarks,
    destutil,
    error,
    extensions,
    util,
)
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)
    if len(getattr(orig, 'func_defaults', ())) == 3: # version hg-3.7
        return orig(repo, action, sourceset, onheadcheck)
    if 3 < len(getattr(orig, 'func_defaults', ())): # version hg-3.8 and above
        return orig(repo, action, sourceset, onheadcheck, destspace=destspace)
    else:
        return orig(repo)

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"""
    if util.safehasattr(destutil, '_destmergebranch'):
        extensions.wrapfunction(destutil, '_destmergebranch', _destmergebranch)
    try:
        rebase = extensions.find('rebase')
    except KeyError:
        rebase = None
    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)