hgext/narrow/narrowwirepeer.py

narrowspec: move module into core

Having support for parsing the narrow specification in core is
necessary for moving many other parts of narrow to core.

We do still want to harmonize the narrow spec with the sparse
spec. And the format needs to be documented. But this shouldn't
hold up the code moving to core.

Differential Revision: https://phab.mercurial-scm.org/D2201

# narrowwirepeer.py - passes narrow spec with unbundle command
#
# Copyright 2017 Google, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial import (
    error,
    extensions,
    hg,
    narrowspec,
    node,
)

def uisetup():
    def peersetup(ui, peer):
        # We must set up the expansion before reposetup below, since it's used
        # at clone time before we have a repo.
        class expandingpeer(peer.__class__):
            def expandnarrow(self, narrow_include, narrow_exclude, nodes):
                ui.status(_("expanding narrowspec\n"))
                if not self.capable('exp-expandnarrow'):
                    raise error.Abort(
                        'peer does not support expanding narrowspecs')

                hex_nodes = (node.hex(n) for n in nodes)
                new_narrowspec = self._call(
                    'expandnarrow',
                    includepats=','.join(narrow_include),
                    excludepats=','.join(narrow_exclude),
                    nodes=','.join(hex_nodes))

                return narrowspec.parseserverpatterns(new_narrowspec)
        peer.__class__ = expandingpeer
    hg.wirepeersetupfuncs.append(peersetup)

def reposetup(repo):
    def wirereposetup(ui, peer):
        def wrapped(orig, cmd, *args, **kwargs):
            if cmd == 'unbundle':
                # TODO: don't blindly add include/exclude wireproto
                # arguments to unbundle.
                include, exclude = repo.narrowpats
                kwargs["includepats"] = ','.join(include)
                kwargs["excludepats"] = ','.join(exclude)
            return orig(cmd, *args, **kwargs)
        extensions.wrapfunction(peer, '_calltwowaystream', wrapped)
    hg.wirepeersetupfuncs.append(wirereposetup)