# narrowrepo.py - repository which supports narrow revlogs, lazy loading

#

# 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 import (

    changegroup,

    hg,

    narrowspec,

    scmutil,

)

from . import (

    narrowrevlog,

)

def wrappostshare(orig, sourcerepo, destrepo, **kwargs):

    orig(sourcerepo, destrepo, **kwargs)

    if changegroup.NARROW_REQUIREMENT in sourcerepo.requirements:

        with destrepo.wlock():

            with destrepo.vfs('shared', 'a') as fp:

                fp.write(narrowspec.FILENAME + '\n')

def unsharenarrowspec(orig, ui, repo, repopath):

    if (changegroup.NARROW_REQUIREMENT in repo.requirements

        and repo.path == repopath and repo.shared()):

        srcrepo = hg.sharedreposource(repo)

        with srcrepo.vfs(narrowspec.FILENAME) as f:

            spec = f.read()

        with repo.vfs(narrowspec.FILENAME, 'w') as f:

            f.write(spec)

    return orig(ui, repo, repopath)

def wraprepo(repo):

    """Enables narrow clone functionality on a single local repository."""

    class narrowrepository(repo.__class__):

        def file(self, f):

            fl = super(narrowrepository, self).file(f)

            narrowrevlog.makenarrowfilelog(fl, self.narrowmatch())

            return fl

        # I'm not sure this is the right place to do this filter.

        # context._manifestmatches() would probably be better, or perhaps

        # move it to a later place, in case some of the callers do want to know

        # which directories changed. This seems to work for now, though.

        def status(self, *args, **kwargs):

            s = super(narrowrepository, self).status(*args, **kwargs)

            narrowmatch = self.narrowmatch()

            modified = list(filter(narrowmatch, s.modified))

            added = list(filter(narrowmatch, s.added))

            removed = list(filter(narrowmatch, s.removed))

            deleted = list(filter(narrowmatch, s.deleted))

            unknown = list(filter(narrowmatch, s.unknown))

            ignored = list(filter(narrowmatch, s.ignored))

            clean = list(filter(narrowmatch, s.clean))

            return scmutil.status(modified, added, removed, deleted, unknown,

                                  ignored, clean)

    repo.__class__ = narrowrepository