annotate hgext/narrow/narrowrepo.py @ 36160:9fd8c2a3db5a

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

# 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,
    hg,
    localrepo,
    match as matchmod,
    narrowspec,
    scmutil,
)

from . import (
    narrowrevlog,
)

# 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()):
        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, 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