# 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 (

    bundlerepo,

    localrepo,

    match as matchmod,

    scmutil,

)

from . import (

    narrowrevlog,

    narrowspec,

)

# When narrowing is finalized and no longer subject to format changes,

# we should move this to just "narrow" or similar.

REQUIREMENT = 'narrowhg-experimental'

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

    orig(sourcerepo, destrepo, **kwargs)

    if 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 (REQUIREMENT in repo.requirements

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

        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, opts_narrow):

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

    cacheprop = localrepo.storecache

    if isinstance(repo, bundlerepo.bundlerepository):

        # We have to use a different caching property decorator for

        # bundlerepo because storecache blows up in strange ways on a

        # bundlerepo. Fortunately, there's no risk of data changing in

        # a bundlerepo.

        cacheprop = lambda name: localrepo.unfilteredpropertycache

    class narrowrepository(repo.__class__):

        def _constructmanifest(self):

            manifest = super(narrowrepository, self)._constructmanifest()

            narrowrevlog.makenarrowmanifestrevlog(manifest, repo)

            return manifest

        @cacheprop('00manifest.i')

        def manifestlog(self):

            mfl = super(narrowrepository, self).manifestlog

            narrowrevlog.makenarrowmanifestlog(mfl, self)

            return mfl

        def file(self, f):

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

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

            return fl

        @localrepo.repofilecache(narrowspec.FILENAME)

        def narrowpats(self):

            """matcher patterns for this repository's narrowspec

            A tuple of (includes, excludes).

            """

            return narrowspec.load(self)

        @localrepo.repofilecache(narrowspec.FILENAME)

        def _narrowmatch(self):

            include, exclude = self.narrowpats

            if not opts_narrow and not include and not exclude:

                return matchmod.always(self.root, '')

            return narrowspec.match(self.root, include=include, exclude=exclude)

        # TODO(martinvonz): make this property-like instead?

        def narrowmatch(self):

            return self._narrowmatch

        def setnarrowpats(self, newincludes, newexcludes):

            narrowspec.save(self, newincludes, newexcludes)

            self.invalidate(clearfilecache=True)

        # 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