mercurial/discovery.py

43075:57875cf423c9

    setdiscovery,
    treediscovery,
    util,
)

def findcommonincoming(repo, remote, heads=None, force=False, ancestorsof=None):
    """Return a tuple (common, anyincoming, heads) used to identify the common
    subset of nodes between repo and remote.

    "common" is a list of (at least) the heads of the common subset.

    if not remote.capable('getbundle'):
        return treediscovery.findcommonincoming(repo, remote, heads, force)

    if heads:
        knownnode = repo.changelog.hasnode # no nodemap until it is filtered
        if all(knownnode(h) for h in heads):
            return (heads, False, heads)

    res = setdiscovery.findcommonheads(repo.ui, repo, remote,
                                       abortwhenunrelated=not force,
                                       ancestorsof=ancestorsof)
    common, anyinc, srvheads = res
    return (list(common), anyinc, heads or list(srvheads))

class outgoing(object):
    '''Represents the set of nodes present in a local repo but not in a
    (possibly) remote one.

      commonheads is the list of heads of common.

    The sets are computed on demand from the heads, unless provided upfront
    by discovery.'''

    def __init__(self, repo, commonheads=None, missingheads=None,
                 missingroots=None):
        # at least one of them must not be set
        assert None in (commonheads, missingroots)
        cl = repo.changelog
        if missingheads is None:
            missingheads = cl.heads()

        self._common = None
        self._missing = None
        self.excluded = []

    def _computecommonmissing(self):
        sets = self._revlog.findcommonmissing(self.commonheads,
                                              self.missingheads)
        self._common, self._missing = sets

    @util.propertycache
    def common(self):
        if self._common is None:

    def missing(self):
        if self._missing is None:
            self._computecommonmissing()
        return self._missing

def findcommonoutgoing(repo, other, onlyheads=None, force=False,
                       commoninc=None, portable=False):
    '''Return an outgoing instance to identify the nodes present in repo but
    not in other.

    If onlyheads is given, only nodes ancestral to nodes in onlyheads
    (inclusive) are included. If you already know the local repo's heads,

    # declare an empty outgoing object to be filled later
    og = outgoing(repo, None, None)

    # get common set if not provided
    if commoninc is None:
        commoninc = findcommonincoming(repo, other, force=force,
                                       ancestorsof=onlyheads)
    og.commonheads, _any, _hds = commoninc

    # compute outgoing
    mayexclude = (repo._phasecache.phaseroots[phases.secret] or repo.obsstore)
    if not mayexclude:
        og.missingheads = onlyheads or repo.heads()
    elif onlyheads is None:
        # use visible heads as it should be cached
        og.missingheads = repo.filtered("served").heads()

                excluded.append(node)
            else:
                missing.append(node)
        if len(missing) == len(allmissing):
            missingheads = onlyheads
        else: # update missing heads
            missingheads = phases.newheads(repo, onlyheads, excluded)
        og.missingheads = missingheads
    if portable:
        # recompute common and missingheads as if -r<rev> had been given for
        # each head of missing, and --base <rev> for each head of the proper

        og._common = set(cl.ancestors(missingrevs)) - missingrevs
        commonheads = set(og.commonheads)
        og.missingheads = [h for h in og.missingheads if h not in commonheads]

    return og

def _headssummary(pushop):
    """compute a summary of branch and heads status before and after push

    return {'branch': ([remoteheads], [newheads],

        branches.add(ctx.branch())

    with remote.commandexecutor() as e:
        remotemap = e.callcommand('branchmap', {}).result()

    knownnode = cl.hasnode # do not use nodemap until it is filtered
    # A. register remote heads of branches which are in outgoing set
    for branch, heads in remotemap.iteritems():
        # don't add head info about branches which we don't have locally
        if branch not in branches:
            continue

        if branch not in headssum:
            headssum[branch] = (None, [], [])

    # C. Update newmap with outgoing changes.
    # This will possibly add new heads and remove existing ones.
    newmap = branchmap.remotebranchcache((branch, heads[1])
                                 for branch, heads in headssum.iteritems()
                                 if heads[0] is not None)
    newmap.update(repo, (ctx.rev() for ctx in missingctx))
    for branch, newheads in newmap.iteritems():
        headssum[branch][1][:] = newheads
    for branch, items in headssum.iteritems():
        for l in items:

        futureheads |= set(torev(h) for h in outgoing.commonheads)
        allfuturecommon = repo.changelog.ancestors(futureheads, inclusive=True)
        for branch, heads in sorted(headssum.iteritems()):
            remoteheads, newheads, unsyncedheads, placeholder = heads
            result = _postprocessobsolete(pushop, allfuturecommon, newheads)
            headssum[branch] = (remoteheads, sorted(result[0]), unsyncedheads,
                                sorted(result[1]))
    return headssum

def _oldheadssummary(repo, remoteheads, outgoing, inc=False):
    """Compute branchmapsummary for repo without branchmap support"""

    # 1-4b. old servers: Check for new topological heads.
    # Construct {old,new}map with branch = None (topological branch).
    # (code based on update)
    knownnode = repo.changelog.hasnode # no nodemap until it is filtered
    oldheads = sorted(h for h in remoteheads if knownnode(h))
    # all nodes in outgoing.missing are children of either:
    # - an element of oldheads
    # - another element of outgoing.missing
    # - nullrev

        unsynced = [None]
    else:
        unsynced = []
    return {None: (oldheads, newheads, unsynced, [])}

def _nowarnheads(pushop):
    # Compute newly pushed bookmarks. We don't warn about bookmarked heads.
    repo = pushop.repo.unfiltered()
    remote = pushop.remote
    localbookmarks = repo._bookmarks

    with remote.commandexecutor() as e:
        remotebookmarks = e.callcommand('listkeys', {
            'namespace': 'bookmarks',
        }).result()

    bookmarkedheads = set()

    # internal config: bookmarks.pushing
    newbookmarks = [localbookmarks.expandname(b)
                    for b in pushop.ui.configlist('bookmarks', 'pushing')]

    for bm in localbookmarks:
        rnode = remotebookmarks.get(bm)
        if rnode and rnode in repo:
            lctx, rctx = repo[localbookmarks[bm]], repo[rnode]

            if bm in newbookmarks and bm not in remotebookmarks:
                bookmarkedheads.add(localbookmarks[bm])

    return bookmarkedheads

def checkheads(pushop):
    """Check that a push won't add any outgoing head

    raise Abort error and display ui message as needed.
    """

    if remote.capable('branchmap'):
        headssum = _headssummary(pushop)
    else:
        headssum = _oldheadssummary(repo, remoteheads, outgoing, inc)
    pushop.pushbranchmap = headssum
    newbranches = [branch for branch, heads in headssum.iteritems()
                   if heads[0] is None]
    # 1. Check for new branches on the remote.
    if newbranches and not newbranch:  # new branch requires --new-branch
        branchnames = ', '.join(sorted(newbranches))
        # Calculate how many of the new branches are closed branches
        closedbranches = set()
        for tag, heads, tip, isclosed in repo.branchmap().iterbranches():
            if isclosed:
                closedbranches.add(tag)
        closedbranches = (closedbranches & set(newbranches))
        if closedbranches:
            errmsg = (_("push creates new remote branches: %s (%d closed)!")
                        % (branchnames, len(closedbranches)))
        else:
            errmsg = (_("push creates new remote branches: %s!")% branchnames)
        hint=_("use 'hg push --new-branch' to create new remote branches")
        raise error.Abort(errmsg, hint=hint)

    # 2. Find heads that we need not warn about
    nowarnheads = _nowarnheads(pushop)

        if remoteheads is None:
            oldhs = set()
        else:
            oldhs = set(remoteheads)
        oldhs.update(unsyncedheads)
        dhs = None # delta heads, the new heads on branch
        newhs = set(newheads)
        newhs.update(unsyncedheads)
        if unsyncedheads:
            if None in unsyncedheads:
                # old remote, no heads data
                heads = None
            else:
                heads = scmutil.nodesummaries(repo, unsyncedheads)
            if heads is None:
                repo.ui.status(_("remote has heads that are "
                                 "not known locally\n"))
            elif branch is None:
                repo.ui.status(_("remote has heads that are "
                                 "not known locally: %s\n") % heads)
            else:
                repo.ui.status(_("remote has heads on branch '%s' that are "
                                 "not known locally: %s\n") % (branch, heads))
        if remoteheads is None:
            if len(newhs) > 1:
                dhs = list(newhs)
                if errormsg is None:
                    errormsg = (
                        _("push creates new branch '%s' with multiple heads") %
                        branch
                    )
                    hint = _("merge or"
                             " see 'hg help push' for details about"
                             " pushing new heads")
        elif len(newhs) > len(oldhs):
            # remove bookmarked or existing remote heads from the new heads list
            dhs = sorted(newhs - nowarnheads - oldhs)
        if dhs:
            if errormsg is None:
                if branch not in ('default', None):
                    errormsg = _("push creates new remote head %s "
                                 "on branch '%s'!") % (short(dhs[0]), branch)
                elif repo[dhs[0]].bookmarks():
                    errormsg = _("push creates new remote head %s "
                                 "with bookmark '%s'!") % (
                                 short(dhs[0]), repo[dhs[0]].bookmarks()[0])
                else:
                    errormsg = _("push creates new remote head %s!"
                                 ) % short(dhs[0])
                if unsyncedheads:
                    hint = _("pull and merge or"
                             " see 'hg help push' for details about"
                             " pushing new heads")
                else:
                    hint = _("merge or"
                             " see 'hg help push' for details about"
                             " pushing new heads")
            if branch is None:
                repo.ui.note(_("new remote heads:\n"))
            else:
                repo.ui.note(_("new remote heads on branch '%s':\n") % branch)
            for h in dhs:
                repo.ui.note((" %s\n") % short(h))
    if errormsg:
        raise error.Abort(errormsg, hint=hint)

def _postprocessobsolete(pushop, futurecommon, candidate_newhs):
    """post process the list of new heads with obsolescence information

    Exists as a sub-function to contain the complexity and allow extensions to

    unfi = repo.unfiltered()
    tonode = unfi.changelog.node
    torev = unfi.changelog.nodemap.get
    public = phases.public
    getphase = unfi._phasecache.phase
    ispublic = (lambda r: getphase(unfi, r) == public)
    ispushed = (lambda n: torev(n) in futurecommon)
    hasoutmarker = functools.partial(pushingmarkerfor, unfi.obsstore, ispushed)
    successorsmarkers = unfi.obsstore.successors
    newhs = set() # final set of new heads
    discarded = set() # new head of fully replaced branch

    localcandidate = set() # candidate heads known locally
    unknownheads = set() # candidate heads unknown locally
    for h in candidate_newhs:
        if h in unfi:
            localcandidate.add(h)
        else:
            if successorsmarkers.get(h) is not None:
                msg = ('checkheads: remote head unknown locally has'
                       ' local marker: %s\n')
                repo.ui.debug(msg % hex(h))
            unknownheads.add(h)

    # fast path the simple case
    if len(localcandidate) == 1:

    # actually process branch replacement
    while localcandidate:
        nh = localcandidate.pop()
        # run this check early to skip the evaluation of the whole branch
        if (torev(nh) in futurecommon or ispublic(torev(nh))):
            newhs.add(nh)
            continue

        # Get all revs/nodes on the branch exclusive to this head
        # (already filtered heads are "ignored"))
        branchrevs = unfi.revs('only(%n, (%ln+%ln))',
                               nh, localcandidate, newhs)
        branchnodes = [tonode(r) for r in branchrevs]

        # The branch won't be hidden on the remote if
        # * any part of it is public,
        # * any part of it is considered part of the result by previous logic,
        # * if we have no markers to push to obsolete it.
        if (any(ispublic(r) for r in branchrevs)
                or any(torev(n) in futurecommon for n in branchnodes)
                or any(not hasoutmarker(n) for n in branchnodes)):
            newhs.add(nh)
        else:
            # note: there is a corner case if there is a merge in the branch.
            # we might end up with -more- heads.  However, these heads are not
            # "added" by the push, but more by the "removal" on the remote so I
            # think is a okay to ignore them,
            discarded.add(nh)
    newhs |= unknownheads
    return newhs, discarded

def pushingmarkerfor(obsstore, ispushed, node):
    """true if some markers are to be pushed for node

    We cannot just look in to the pushed obsmarkers from the pushop because

        if ispushed(current):
            return True
        markers = successorsmarkers.get(current, ())
        # markers fields = ('prec', 'succs', 'flag', 'meta', 'date', 'parents')
        for m in markers:
            nexts = m[1] # successors
            if not nexts: # this is a prune marker
                nexts = m[5] or () # parents
            for n in nexts:
                if n not in seen:
                    seen.add(n)
                    stack.append(n)
    return False

43076:2372284d9457

    setdiscovery,
    treediscovery,
    util,
)


def findcommonincoming(repo, remote, heads=None, force=False, ancestorsof=None):
    """Return a tuple (common, anyincoming, heads) used to identify the common
    subset of nodes between repo and remote.

    "common" is a list of (at least) the heads of the common subset.

    if not remote.capable('getbundle'):
        return treediscovery.findcommonincoming(repo, remote, heads, force)

    if heads:
        knownnode = repo.changelog.hasnode  # no nodemap until it is filtered
        if all(knownnode(h) for h in heads):
            return (heads, False, heads)

    res = setdiscovery.findcommonheads(
        repo.ui,
        repo,
        remote,
        abortwhenunrelated=not force,
        ancestorsof=ancestorsof,
    )
    common, anyinc, srvheads = res
    return (list(common), anyinc, heads or list(srvheads))


class outgoing(object):
    '''Represents the set of nodes present in a local repo but not in a
    (possibly) remote one.

      commonheads is the list of heads of common.

    The sets are computed on demand from the heads, unless provided upfront
    by discovery.'''

    def __init__(
        self, repo, commonheads=None, missingheads=None, missingroots=None
    ):
        # at least one of them must not be set
        assert None in (commonheads, missingroots)
        cl = repo.changelog
        if missingheads is None:
            missingheads = cl.heads()

        self._common = None
        self._missing = None
        self.excluded = []

    def _computecommonmissing(self):
        sets = self._revlog.findcommonmissing(
            self.commonheads, self.missingheads
        )
        self._common, self._missing = sets

    @util.propertycache
    def common(self):
        if self._common is None:

    def missing(self):
        if self._missing is None:
            self._computecommonmissing()
        return self._missing


def findcommonoutgoing(
    repo, other, onlyheads=None, force=False, commoninc=None, portable=False
):
    '''Return an outgoing instance to identify the nodes present in repo but
    not in other.

    If onlyheads is given, only nodes ancestral to nodes in onlyheads
    (inclusive) are included. If you already know the local repo's heads,

    # declare an empty outgoing object to be filled later
    og = outgoing(repo, None, None)

    # get common set if not provided
    if commoninc is None:
        commoninc = findcommonincoming(
            repo, other, force=force, ancestorsof=onlyheads
        )
    og.commonheads, _any, _hds = commoninc

    # compute outgoing
    mayexclude = repo._phasecache.phaseroots[phases.secret] or repo.obsstore
    if not mayexclude:
        og.missingheads = onlyheads or repo.heads()
    elif onlyheads is None:
        # use visible heads as it should be cached
        og.missingheads = repo.filtered("served").heads()

                excluded.append(node)
            else:
                missing.append(node)
        if len(missing) == len(allmissing):
            missingheads = onlyheads
        else:  # update missing heads
            missingheads = phases.newheads(repo, onlyheads, excluded)
        og.missingheads = missingheads
    if portable:
        # recompute common and missingheads as if -r<rev> had been given for
        # each head of missing, and --base <rev> for each head of the proper

        og._common = set(cl.ancestors(missingrevs)) - missingrevs
        commonheads = set(og.commonheads)
        og.missingheads = [h for h in og.missingheads if h not in commonheads]

    return og


def _headssummary(pushop):
    """compute a summary of branch and heads status before and after push

    return {'branch': ([remoteheads], [newheads],

        branches.add(ctx.branch())

    with remote.commandexecutor() as e:
        remotemap = e.callcommand('branchmap', {}).result()

    knownnode = cl.hasnode  # do not use nodemap until it is filtered
    # A. register remote heads of branches which are in outgoing set
    for branch, heads in remotemap.iteritems():
        # don't add head info about branches which we don't have locally
        if branch not in branches:
            continue

        if branch not in headssum:
            headssum[branch] = (None, [], [])

    # C. Update newmap with outgoing changes.
    # This will possibly add new heads and remove existing ones.
    newmap = branchmap.remotebranchcache(
        (branch, heads[1])
        for branch, heads in headssum.iteritems()
        if heads[0] is not None
    )
    newmap.update(repo, (ctx.rev() for ctx in missingctx))
    for branch, newheads in newmap.iteritems():
        headssum[branch][1][:] = newheads
    for branch, items in headssum.iteritems():
        for l in items:

        futureheads |= set(torev(h) for h in outgoing.commonheads)
        allfuturecommon = repo.changelog.ancestors(futureheads, inclusive=True)
        for branch, heads in sorted(headssum.iteritems()):
            remoteheads, newheads, unsyncedheads, placeholder = heads
            result = _postprocessobsolete(pushop, allfuturecommon, newheads)
            headssum[branch] = (
                remoteheads,
                sorted(result[0]),
                unsyncedheads,
                sorted(result[1]),
            )
    return headssum


def _oldheadssummary(repo, remoteheads, outgoing, inc=False):
    """Compute branchmapsummary for repo without branchmap support"""

    # 1-4b. old servers: Check for new topological heads.
    # Construct {old,new}map with branch = None (topological branch).
    # (code based on update)
    knownnode = repo.changelog.hasnode  # no nodemap until it is filtered
    oldheads = sorted(h for h in remoteheads if knownnode(h))
    # all nodes in outgoing.missing are children of either:
    # - an element of oldheads
    # - another element of outgoing.missing
    # - nullrev

        unsynced = [None]
    else:
        unsynced = []
    return {None: (oldheads, newheads, unsynced, [])}


def _nowarnheads(pushop):
    # Compute newly pushed bookmarks. We don't warn about bookmarked heads.
    repo = pushop.repo.unfiltered()
    remote = pushop.remote
    localbookmarks = repo._bookmarks

    with remote.commandexecutor() as e:
        remotebookmarks = e.callcommand(
            'listkeys', {'namespace': 'bookmarks',}
        ).result()

    bookmarkedheads = set()

    # internal config: bookmarks.pushing
    newbookmarks = [
        localbookmarks.expandname(b)
        for b in pushop.ui.configlist('bookmarks', 'pushing')
    ]

    for bm in localbookmarks:
        rnode = remotebookmarks.get(bm)
        if rnode and rnode in repo:
            lctx, rctx = repo[localbookmarks[bm]], repo[rnode]

            if bm in newbookmarks and bm not in remotebookmarks:
                bookmarkedheads.add(localbookmarks[bm])

    return bookmarkedheads


def checkheads(pushop):
    """Check that a push won't add any outgoing head

    raise Abort error and display ui message as needed.
    """

    if remote.capable('branchmap'):
        headssum = _headssummary(pushop)
    else:
        headssum = _oldheadssummary(repo, remoteheads, outgoing, inc)
    pushop.pushbranchmap = headssum
    newbranches = [
        branch for branch, heads in headssum.iteritems() if heads[0] is None
    ]
    # 1. Check for new branches on the remote.
    if newbranches and not newbranch:  # new branch requires --new-branch
        branchnames = ', '.join(sorted(newbranches))
        # Calculate how many of the new branches are closed branches
        closedbranches = set()
        for tag, heads, tip, isclosed in repo.branchmap().iterbranches():
            if isclosed:
                closedbranches.add(tag)
        closedbranches = closedbranches & set(newbranches)
        if closedbranches:
            errmsg = _("push creates new remote branches: %s (%d closed)!") % (
                branchnames,
                len(closedbranches),
            )
        else:
            errmsg = _("push creates new remote branches: %s!") % branchnames
        hint = _("use 'hg push --new-branch' to create new remote branches")
        raise error.Abort(errmsg, hint=hint)

    # 2. Find heads that we need not warn about
    nowarnheads = _nowarnheads(pushop)

        if remoteheads is None:
            oldhs = set()
        else:
            oldhs = set(remoteheads)
        oldhs.update(unsyncedheads)
        dhs = None  # delta heads, the new heads on branch
        newhs = set(newheads)
        newhs.update(unsyncedheads)
        if unsyncedheads:
            if None in unsyncedheads:
                # old remote, no heads data
                heads = None
            else:
                heads = scmutil.nodesummaries(repo, unsyncedheads)
            if heads is None:
                repo.ui.status(
                    _("remote has heads that are " "not known locally\n")
                )
            elif branch is None:
                repo.ui.status(
                    _("remote has heads that are " "not known locally: %s\n")
                    % heads
                )
            else:
                repo.ui.status(
                    _(
                        "remote has heads on branch '%s' that are "
                        "not known locally: %s\n"
                    )
                    % (branch, heads)
                )
        if remoteheads is None:
            if len(newhs) > 1:
                dhs = list(newhs)
                if errormsg is None:
                    errormsg = (
                        _("push creates new branch '%s' with multiple heads")
                        % branch
                    )
                    hint = _(
                        "merge or"
                        " see 'hg help push' for details about"
                        " pushing new heads"
                    )
        elif len(newhs) > len(oldhs):
            # remove bookmarked or existing remote heads from the new heads list
            dhs = sorted(newhs - nowarnheads - oldhs)
        if dhs:
            if errormsg is None:
                if branch not in ('default', None):
                    errormsg = _(
                        "push creates new remote head %s " "on branch '%s'!"
                    ) % (short(dhs[0]), branch)
                elif repo[dhs[0]].bookmarks():
                    errormsg = _(
                        "push creates new remote head %s " "with bookmark '%s'!"
                    ) % (short(dhs[0]), repo[dhs[0]].bookmarks()[0])
                else:
                    errormsg = _("push creates new remote head %s!") % short(
                        dhs[0]
                    )
                if unsyncedheads:
                    hint = _(
                        "pull and merge or"
                        " see 'hg help push' for details about"
                        " pushing new heads"
                    )
                else:
                    hint = _(
                        "merge or"
                        " see 'hg help push' for details about"
                        " pushing new heads"
                    )
            if branch is None:
                repo.ui.note(_("new remote heads:\n"))
            else:
                repo.ui.note(_("new remote heads on branch '%s':\n") % branch)
            for h in dhs:
                repo.ui.note(" %s\n" % short(h))
    if errormsg:
        raise error.Abort(errormsg, hint=hint)


def _postprocessobsolete(pushop, futurecommon, candidate_newhs):
    """post process the list of new heads with obsolescence information

    Exists as a sub-function to contain the complexity and allow extensions to

    unfi = repo.unfiltered()
    tonode = unfi.changelog.node
    torev = unfi.changelog.nodemap.get
    public = phases.public
    getphase = unfi._phasecache.phase
    ispublic = lambda r: getphase(unfi, r) == public
    ispushed = lambda n: torev(n) in futurecommon
    hasoutmarker = functools.partial(pushingmarkerfor, unfi.obsstore, ispushed)
    successorsmarkers = unfi.obsstore.successors
    newhs = set()  # final set of new heads
    discarded = set()  # new head of fully replaced branch

    localcandidate = set()  # candidate heads known locally
    unknownheads = set()  # candidate heads unknown locally
    for h in candidate_newhs:
        if h in unfi:
            localcandidate.add(h)
        else:
            if successorsmarkers.get(h) is not None:
                msg = (
                    'checkheads: remote head unknown locally has'
                    ' local marker: %s\n'
                )
                repo.ui.debug(msg % hex(h))
            unknownheads.add(h)

    # fast path the simple case
    if len(localcandidate) == 1:

    # actually process branch replacement
    while localcandidate:
        nh = localcandidate.pop()
        # run this check early to skip the evaluation of the whole branch
        if torev(nh) in futurecommon or ispublic(torev(nh)):
            newhs.add(nh)
            continue

        # Get all revs/nodes on the branch exclusive to this head
        # (already filtered heads are "ignored"))
        branchrevs = unfi.revs('only(%n, (%ln+%ln))', nh, localcandidate, newhs)
        branchnodes = [tonode(r) for r in branchrevs]

        # The branch won't be hidden on the remote if
        # * any part of it is public,
        # * any part of it is considered part of the result by previous logic,
        # * if we have no markers to push to obsolete it.
        if (
            any(ispublic(r) for r in branchrevs)
            or any(torev(n) in futurecommon for n in branchnodes)
            or any(not hasoutmarker(n) for n in branchnodes)
        ):
            newhs.add(nh)
        else:
            # note: there is a corner case if there is a merge in the branch.
            # we might end up with -more- heads.  However, these heads are not
            # "added" by the push, but more by the "removal" on the remote so I
            # think is a okay to ignore them,
            discarded.add(nh)
    newhs |= unknownheads
    return newhs, discarded


def pushingmarkerfor(obsstore, ispushed, node):
    """true if some markers are to be pushed for node

    We cannot just look in to the pushed obsmarkers from the pushop because

        if ispushed(current):
            return True
        markers = successorsmarkers.get(current, ())
        # markers fields = ('prec', 'succs', 'flag', 'meta', 'date', 'parents')
        for m in markers:
            nexts = m[1]  # successors
            if not nexts:  # this is a prune marker
                nexts = m[5] or ()  # parents
            for n in nexts:
                if n not in seen:
                    seen.add(n)
                    stack.append(n)
    return False