hgext3rd/serverminitopic.py
author Anton Shestakov <av6@dwimlabs.net>
Wed, 08 Apr 2020 01:16:59 +0800
branchmercurial-4.7
changeset 5283 02cc51ca6795
parent 5042 51d0f2355215
child 5180 515d425c0a05
permissions -rw-r--r--
test-compat: merge mercurial-4.8 into mercurial-4.7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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"""enable a minimal verison of topic for server
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! This extensions is not actively maintained
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! We recommand using the main topic extension instead
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Non publishing repository will see topic as "branch:topic" in the branch field.
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In addition to adding the extensions, the feature must be manually enabled in the config:
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    [experimental]
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    server-mini-topic = yes
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"""
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import hashlib
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import contextlib
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from mercurial import (
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    branchmap,
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    context,
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    encoding,
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    extensions,
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    node,
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    registrar,
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    util,
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)
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# hg <= 4.5 (b4d85bc122bd)
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try:
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    from mercurial import wireproto  # pytype: disable=import-error
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    wireproto.branchmap
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except ImportError:
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    from mercurial import wireprotov1server as wireproto
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if util.safehasattr(registrar, 'configitem'):
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    configtable = {}
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    configitem = registrar.configitem(configtable)
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    configitem(b'experimental', b'server-mini-topic',
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               default=False,
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    )
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def hasminitopic(repo):
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    """true if minitopic is enabled on the repository
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    (The value is cached on the repository)
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    """
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    enabled = getattr(repo, '_hasminitopic', None)
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    if enabled is None:
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        enabled = (repo.ui.configbool(b'experimental', b'server-mini-topic')
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                   and not repo.publishing())
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        repo._hasminitopic = enabled
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    return enabled
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### make topic visible though "ctx.branch()"
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def topicbranch(orig, self):
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    branch = orig(self)
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    if hasminitopic(self._repo) and self.phase():
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        topic = self._changeset.extra.get(b'topic')
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        if topic is not None:
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            topic = encoding.tolocal(topic)
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            branch = b'%s:%s' % (branch, topic)
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    return branch
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### avoid caching topic data in rev-branch-cache
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class revbranchcacheoverlay(object):
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    """revbranch mixin that don't use the cache for non public changeset"""
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    def _init__(self, *args, **kwargs):
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        super(revbranchcacheoverlay, self).__init__(*args, **kwargs)
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        if r'branchinfo' in vars(self):
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            del self.branchinfo
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    def branchinfo(self, rev, changelog=None):
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        """return branch name and close flag for rev, using and updating
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        persistent cache."""
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        phase = self._repo._phasecache.phase(self._repo, rev)
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        if phase:
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            ctx = self._repo[rev]
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            return ctx.branch(), ctx.closesbranch()
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        return super(revbranchcacheoverlay, self).branchinfo(rev)
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def reposetup(ui, repo):
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    """install a repo class with a special revbranchcache"""
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    if hasminitopic(repo):
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        repo = repo.unfiltered()
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        class minitopicrepo(repo.__class__):
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            """repository subclass that install the modified cache"""
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            def revbranchcache(self):
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                if self._revbranchcache is None:
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                    cache = super(minitopicrepo, self).revbranchcache()
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                    class topicawarerbc(revbranchcacheoverlay, cache.__class__):
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                        pass
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                    cache.__class__ = topicawarerbc
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                    if r'branchinfo' in vars(cache):
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                        del cache.branchinfo
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                    self._revbranchcache = cache
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                return self._revbranchcache
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        repo.__class__ = minitopicrepo
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### topic aware branch head cache
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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 = node.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(b'%d;' % rev)
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        key = s.digest()
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    return key
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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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_publiconly = set([
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    b'base',
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    b'immutable',
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])
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def mighttopic(repo):
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    return hasminitopic(repo) and repo.filtername not in _publiconly
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class _topiccache(branchmap.branchcache): # combine me with branchmap.branchcache
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    @classmethod
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    def fromfile(cls, repo):
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        orig = super(_topiccache, cls).fromfile
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        return wrapread(orig, repo)
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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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        if util.safehasattr(self, '_entries'):
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            _entries = self._entries
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        else:
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            # hg <= 4.9 (624d6683c705, b137a6793c51)
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            _entries = self
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        new = self.__class__(_entries, self.tipnode, self.tiprev,
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                             self.filteredhash, self._closednodes)
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        new.phaseshash = self.phaseshash
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        return new
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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 self.phaseshash is None:
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            # phasehash at None means this is a branchmap
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            # coming from a public only set
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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 (hope) mutable set to be small enough to be that computing
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        # it all the time will be fast enough
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        if not mighttopic(repo):
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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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        super(_topiccache, self).update(repo, revgen)
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        if mighttopic(repo):
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            self.phaseshash = _phaseshash(repo, self.tiprev)
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def wrapread(orig, repo):
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    # Avoiding to write cache for filter where topic applies is a good step,
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    # but we need to also avoid reading it. Existing branchmap cache might
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    # exists before the turned the feature on.
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    if mighttopic(repo):
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        return None
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    return orig(repo)
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# advertise topic capabilities
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def wireprotocaps(orig, repo, proto):
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    caps = orig(repo, proto)
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    if hasminitopic(repo):
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        caps.append(b'topics')
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    return caps
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# wrap the necessary bit
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def wrapclass(container, oldname, new):
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    old = getattr(container, oldname)
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    if not issubclass(old, new):
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        targetclass = new
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        # check if someone else already wrapped the class and handle that
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        if not issubclass(new, old):
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            class targetclass(new, old):
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                pass
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        setattr(container, oldname, targetclass)
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    current = getattr(container, oldname)
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    assert issubclass(current, new), (current, new, targetclass)
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def uisetup(ui):
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Pierre-Yves David <pierre-yves.david@octobus.net>
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    wrapclass(branchmap, 'branchcache', _topiccache)
4394
c6d1b0a6babe topic: make topics compatible with branchmap refactor
Martijn Pieters <mj@octobus.net>
parents: 4364
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    try:
c6d1b0a6babe topic: make topics compatible with branchmap refactor
Martijn Pieters <mj@octobus.net>
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        # Mercurial 4.8 and older
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        extensions.wrapfunction(branchmap, 'read', wrapread)
c6d1b0a6babe topic: make topics compatible with branchmap refactor
Martijn Pieters <mj@octobus.net>
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    except AttributeError:
c6d1b0a6babe topic: make topics compatible with branchmap refactor
Martijn Pieters <mj@octobus.net>
parents: 4364
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        # Mercurial 4.9; branchcache.fromfile now takes care of this
c6d1b0a6babe topic: make topics compatible with branchmap refactor
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        # which is alredy defined on _topiccache
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        pass
3206
3ccde4699cf0 topic: introduce a minimal extensions to enable topic on the server
Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
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    extensions.wrapfunction(wireproto, '_capabilities', wireprotocaps)
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fa15068a9945 serverminitopic: wrap context.changectx.branch instead of context.changectx
Pulkit Goyal <7895pulkit@gmail.com>
parents: 3518
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    extensions.wrapfunction(context.changectx, 'branch', topicbranch)