hgext3rd/topic/topicmap.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Sun, 23 Jul 2017 19:52:06 +0200
changeset 2782 2bd0b0996cfb
parent 2655 417490bdf28a
child 3397 f7129e3d5a38
permissions -rw-r--r--
evolve: document the various instability/troubles We need something to point people at.
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import contextlib
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import hashlib
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from mercurial.node import nullid
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from mercurial import (
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    branchmap,
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    changegroup,
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    cmdutil,
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    extensions,
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    repoview,
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)
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basefilter = set(['base', 'immutable'])
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def topicfilter(name):
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    """return a "topic" version of a filter level"""
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    if name in basefilter:
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        return name
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    elif name is None:
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        return None
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    elif name.endswith('-topic'):
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        return name
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    else:
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        return name + '-topic'
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def istopicfilter(filtername):
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    if filtername is None:
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        return False
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    return filtername.endswith('-topic')
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def gettopicrepo(repo):
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    filtername = topicfilter(repo.filtername)
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    if filtername == repo.filtername:
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        return repo
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    return repo.filtered(filtername)
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def _setuptopicfilter(ui):
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    """extend the filter related mapping with topic related one"""
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    funcmap = repoview.filtertable
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    partialmap = branchmap.subsettable
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    # filter level not affected by topic that we should not override
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    for plainname in list(funcmap):
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        newfilter = topicfilter(plainname)
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        if newfilter == plainname:
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            continue
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        def revsfunc(repo, name=plainname):
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            return repoview.filterrevs(repo, name)
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        base = topicfilter(partialmap[plainname])
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        if newfilter not in funcmap:
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            funcmap[newfilter] = revsfunc
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            partialmap[newfilter] = base
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    funcmap['unfiltered-topic'] = lambda repo: frozenset()
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    partialmap['unfiltered-topic'] = 'visible-topic'
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def _phaseshash(repo, maxrev):
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    """uniq ID for a phase matching a set of rev"""
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    revs = set()
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    cl = repo.changelog
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    fr = cl.filteredrevs
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    nm = cl.nodemap
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    for roots in repo._phasecache.phaseroots[1:]:
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        for n in roots:
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            r = nm.get(n)
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            if r not in fr and r < maxrev:
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                revs.add(r)
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    key = nullid
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    revs = sorted(revs)
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    if revs:
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        s = hashlib.sha1()
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        for rev in revs:
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            s.update('%s;' % rev)
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        key = s.digest()
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    return key
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def modsetup(ui):
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    """call at uisetup time to install various wrappings"""
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    _setuptopicfilter(ui)
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    _wrapbmcache(ui)
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    extensions.wrapfunction(changegroup.cg1unpacker, 'apply', cgapply)
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    extensions.wrapfunction(cmdutil, 'commitstatus', commitstatus)
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def cgapply(orig, self, repo, *args, **kwargs):
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    """make sure a topicmap is used when applying a changegroup"""
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    other = repo.filtered(topicfilter(repo.filtername))
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    return orig(self, other, *args, **kwargs)
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def commitstatus(orig, repo, node, branch, bheads=None, opts=None):
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    # wrap commit status use the topic branch heads
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    ctx = repo[node]
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    if ctx.topic() and ctx.branch() == branch:
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        subbranch = "%s:%s" % (branch, ctx.topic())
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        bheads = repo.branchheads("%s:%s" % (subbranch, ctx.topic()))
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    return orig(repo, node, branch, bheads=bheads, opts=opts)
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def _wrapbmcache(ui):
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    class topiccache(_topiccache, branchmap.branchcache):
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        pass
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    branchmap.branchcache = topiccache
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    extensions.wrapfunction(branchmap, 'updatecache', _wrapupdatebmcache)
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def _wrapupdatebmcache(orig, repo):
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    previous = getattr(repo, '_autobranchmaptopic', False)
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    try:
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        repo._autobranchmaptopic = False
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        return orig(repo)
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    finally:
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        repo._autobranchmaptopic = previous
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# needed to prevent reference used for 'super()' call using in branchmap.py to
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# no go into cycle. (yes, URG)
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_oldbranchmap = branchmap.branchcache
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@contextlib.contextmanager
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def oldbranchmap():
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    previous = branchmap.branchcache
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    try:
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        branchmap.branchcache = _oldbranchmap
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        yield
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    finally:
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        branchmap.branchcache = previous
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class _topiccache(object): # combine me with branchmap.branchcache
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    def __init__(self, *args, **kwargs):
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        # super() call may fail otherwise
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        with oldbranchmap():
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            super(_topiccache, self).__init__(*args, **kwargs)
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        self.phaseshash = None
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    def copy(self):
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        """return an deep copy of the branchcache object"""
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        new = self.__class__(self, self.tipnode, self.tiprev, self.filteredhash,
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                             self._closednodes)
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        new.phaseshash = self.phaseshash
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        return new
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    def branchtip(self, branch, topic=''):
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        '''Return the tipmost open head on branch head, otherwise return the
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        tipmost closed head on branch.
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        Raise KeyError for unknown branch.'''
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        if topic:
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            branch = '%s:%s' % (branch, topic)
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        return super(_topiccache, self).branchtip(branch)
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    def branchheads(self, branch, closed=False, topic=''):
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        if topic:
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            branch = '%s:%s' % (branch, topic)
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        return super(_topiccache, self).branchheads(branch, closed=closed)
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    def validfor(self, repo):
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        """Is the cache content valid regarding a repo
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        - False when cached tipnode is unknown or if we detect a strip.
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        - True when cache is up to date or a subset of current repo."""
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        valid = super(_topiccache, self).validfor(repo)
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        if not valid:
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            return False
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        elif not istopicfilter(repo.filtername) or self.phaseshash is None:
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            # phasehash at None means this is a branchmap
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            # come from non topic thing
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            return True
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        else:
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            try:
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                valid = self.phaseshash == _phaseshash(repo, self.tiprev)
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                return valid
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            except IndexError:
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                return False
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    def write(self, repo):
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        # we expect mutable set to be small enough to be that computing it all
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        # the time will be fast enough
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        if not istopicfilter(repo.filtername):
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            super(_topiccache, self).write(repo)
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    def update(self, repo, revgen):
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        """Given a branchhead cache, self, that may have extra nodes or be
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        missing heads, and a generator of nodes that are strictly a superset of
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        heads missing, this function updates self to be correct.
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        """
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        if not istopicfilter(repo.filtername):
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            return super(_topiccache, self).update(repo, revgen)
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        unfi = repo.unfiltered()
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        oldgetbranchinfo = unfi.revbranchcache().branchinfo
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        def branchinfo(r):
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            info = oldgetbranchinfo(r)
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            topic = ''
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            ctx = unfi[r]
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            if ctx.mutable():
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                topic = ctx.topic()
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            branch = info[0]
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            if topic:
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                branch = '%s:%s' % (branch, topic)
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            return (branch, info[1])
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        try:
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            unfi.revbranchcache().branchinfo = branchinfo
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            super(_topiccache, self).update(repo, revgen)
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            self.phaseshash = _phaseshash(repo, self.tiprev)
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        finally:
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            unfi.revbranchcache().branchinfo = oldgetbranchinfo