# narrowcommands.py - command modifications for narrowhg extension

#

# 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

import itertools

import os

from mercurial.i18n import _

from mercurial import (

    bundle2,

    cmdutil,

    commands,

    discovery,

    encoding,

    error,

    exchange,

    extensions,

    hg,

    merge,

    narrowspec,

    node,

    pycompat,

    registrar,

    repair,

    repository,

    repoview,

    sparse,

    util,

    wireprototypes,

)

table = {}

command = registrar.command(table)

def setup():

    """Wraps user-facing mercurial commands with narrow-aware versions."""

    entry = extensions.wrapcommand(commands.table, 'clone', clonenarrowcmd)

    entry[1].append(('', 'narrow', None,

                     _("create a narrow clone of select files")))

    entry[1].append(('', 'depth', '',

                     _("limit the history fetched by distance from heads")))

    entry[1].append(('', 'narrowspec', '',

                     _("read narrowspecs from file")))

    # TODO(durin42): unify sparse/narrow --include/--exclude logic a bit

    if 'sparse' not in extensions.enabled():

        entry[1].append(('', 'include', [],

                         _("specifically fetch this file/directory")))

        entry[1].append(

            ('', 'exclude', [],

             _("do not fetch this file/directory, even if included")))

    entry = extensions.wrapcommand(commands.table, 'pull', pullnarrowcmd)

    entry[1].append(('', 'depth', '',

                     _("limit the history fetched by distance from heads")))

    extensions.wrapcommand(commands.table, 'archive', archivenarrowcmd)

def clonenarrowcmd(orig, ui, repo, *args, **opts):

    """Wraps clone command, so 'hg clone' first wraps localrepo.clone()."""

    opts = pycompat.byteskwargs(opts)

    wrappedextraprepare = util.nullcontextmanager()

    narrowspecfile = opts['narrowspec']

    if narrowspecfile:

        filepath = os.path.join(encoding.getcwd(), narrowspecfile)

        ui.status(_("reading narrowspec from '%s'\n") % filepath)

        try:

            fdata = util.readfile(filepath)

        except IOError as inst:

            raise error.Abort(_("cannot read narrowspecs from '%s': %s") %

                              (filepath, encoding.strtolocal(inst.strerror)))

        includes, excludes, profiles = sparse.parseconfig(ui, fdata, 'narrow')

        if profiles:

            raise error.Abort(_("cannot specify other files using '%include' in"

                                " narrowspec"))

        narrowspec.validatepatterns(includes)

        narrowspec.validatepatterns(excludes)

        # narrowspec is passed so we should assume that user wants narrow clone

        opts['narrow'] = True

        opts['include'].extend(includes)

        opts['exclude'].extend(excludes)

    if opts['narrow']:

        def pullbundle2extraprepare_widen(orig, pullop, kwargs):

            orig(pullop, kwargs)

            if opts.get('depth'):

                kwargs['depth'] = opts['depth']

        wrappedextraprepare = extensions.wrappedfunction(exchange,

            '_pullbundle2extraprepare', pullbundle2extraprepare_widen)

    with wrappedextraprepare:

        return orig(ui, repo, *args, **pycompat.strkwargs(opts))

def pullnarrowcmd(orig, ui, repo, *args, **opts):

    """Wraps pull command to allow modifying narrow spec."""

    wrappedextraprepare = util.nullcontextmanager()

    if repository.NARROW_REQUIREMENT in repo.requirements:

        def pullbundle2extraprepare_widen(orig, pullop, kwargs):

            orig(pullop, kwargs)

            if opts.get(r'depth'):

                kwargs['depth'] = opts[r'depth']

        wrappedextraprepare = extensions.wrappedfunction(exchange,

            '_pullbundle2extraprepare', pullbundle2extraprepare_widen)

    with wrappedextraprepare:

        return orig(ui, repo, *args, **opts)

def archivenarrowcmd(orig, ui, repo, *args, **opts):

    """Wraps archive command to narrow the default includes."""

    if repository.NARROW_REQUIREMENT in repo.requirements:

        repo_includes, repo_excludes = repo.narrowpats

        includes = set(opts.get(r'include', []))

        excludes = set(opts.get(r'exclude', []))

        includes, excludes, unused_invalid = narrowspec.restrictpatterns(

            includes, excludes, repo_includes, repo_excludes)

        if includes:

            opts[r'include'] = includes

        if excludes:

            opts[r'exclude'] = excludes

    return orig(ui, repo, *args, **opts)

def pullbundle2extraprepare(orig, pullop, kwargs):

    repo = pullop.repo

    if repository.NARROW_REQUIREMENT not in repo.requirements:

        return orig(pullop, kwargs)

    if wireprototypes.NARROWCAP not in pullop.remote.capabilities():

        raise error.Abort(_("server does not support narrow clones"))

    orig(pullop, kwargs)

    kwargs['narrow'] = True

    include, exclude = repo.narrowpats

    kwargs['oldincludepats'] = include

    kwargs['oldexcludepats'] = exclude

    kwargs['includepats'] = include

    kwargs['excludepats'] = exclude

    # calculate known nodes only in ellipses cases because in non-ellipses cases

    # we have all the nodes

    if wireprototypes.ELLIPSESCAP in pullop.remote.capabilities():

        kwargs['known'] = [node.hex(ctx.node()) for ctx in

                           repo.set('::%ln', pullop.common)

                           if ctx.node() != node.nullid]

        if not kwargs['known']:

            # Mercurial serializes an empty list as '' and deserializes it as

            # [''], so delete it instead to avoid handling the empty string on

            # the server.

            del kwargs['known']

extensions.wrapfunction(exchange,'_pullbundle2extraprepare',

                        pullbundle2extraprepare)

# This is an extension point for filesystems that need to do something other

# than just blindly unlink the files. It's not clear what arguments would be

# useful, so we're passing in a fair number of them, some of them redundant.

def _narrowcleanupwdir(repo, oldincludes, oldexcludes, newincludes, newexcludes,

                       oldmatch, newmatch):

    for f in repo.dirstate:

        if not newmatch(f):

            repo.dirstate.drop(f)

            repo.wvfs.unlinkpath(f)

def _narrow(ui, repo, remote, commoninc, oldincludes, oldexcludes,

            newincludes, newexcludes, force):

    oldmatch = narrowspec.match(repo.root, oldincludes, oldexcludes)

    newmatch = narrowspec.match(repo.root, newincludes, newexcludes)

    # This is essentially doing "hg outgoing" to find all local-only

    # commits. We will then check that the local-only commits don't

    # have any changes to files that will be untracked.

    unfi = repo.unfiltered()

    outgoing = discovery.findcommonoutgoing(unfi, remote,

                                            commoninc=commoninc)

    ui.status(_('looking for local changes to affected paths\n'))

    localnodes = []

    for n in itertools.chain(outgoing.missing, outgoing.excluded):

        if any(oldmatch(f) and not newmatch(f) for f in unfi[n].files()):

            localnodes.append(n)

    revstostrip = unfi.revs('descendants(%ln)', localnodes)

    hiddenrevs = repoview.filterrevs(repo, 'visible')

    visibletostrip = list(repo.changelog.node(r)

                          for r in (revstostrip - hiddenrevs))

    if visibletostrip:

        ui.status(_('The following changeset(s) or their ancestors have '

                    'local changes not on the remote:\n'))

        maxnodes = 10

        if ui.verbose or len(visibletostrip) <= maxnodes:

            for n in visibletostrip:

                ui.status('%s\n' % node.short(n))

        else:

            for n in visibletostrip[:maxnodes]:

                ui.status('%s\n' % node.short(n))

            ui.status(_('...and %d more, use --verbose to list all\n') %

                      (len(visibletostrip) - maxnodes))

        if not force:

            raise error.Abort(_('local changes found'),

                              hint=_('use --force-delete-local-changes to '

                                     'ignore'))

    with ui.uninterruptable():

        if revstostrip:

            tostrip = [unfi.changelog.node(r) for r in revstostrip]

            if repo['.'].node() in tostrip:

                # stripping working copy, so move to a different commit first

                urev = max(repo.revs('(::%n) - %ln + null',

                                     repo['.'].node(), visibletostrip))

                hg.clean(repo, urev)

            repair.strip(ui, unfi, tostrip, topic='narrow')

        todelete = []

        for f, f2, size in repo.store.datafiles():

            if f.startswith('data/'):

                file = f[5:-2]

                if not newmatch(file):

                    todelete.append(f)

            elif f.startswith('meta/'):

                dir = f[5:-13]

                dirs = ['.'] + sorted(util.dirs({dir})) + [dir]

                include = True

                for d in dirs:

                    visit = newmatch.visitdir(d)

                    if not visit:

                        include = False

                        break

                    if visit == 'all':

                        break

                if not include:

                    todelete.append(f)

        repo.destroying()

        with repo.transaction("narrowing"):

            for f in todelete:

                ui.status(_('deleting %s\n') % f)

                util.unlinkpath(repo.svfs.join(f))

                repo.store.markremoved(f)

            _narrowcleanupwdir(repo, oldincludes, oldexcludes, newincludes,

                               newexcludes, oldmatch, newmatch)

            repo.setnarrowpats(newincludes, newexcludes)

        repo.destroyed()

def _widen(ui, repo, remote, commoninc, oldincludes, oldexcludes,

           newincludes, newexcludes):

    newmatch = narrowspec.match(repo.root, newincludes, newexcludes)

    # for now we assume that if a server has ellipses enabled, we will be

    # exchanging ellipses nodes. In future we should add ellipses as a client

    # side requirement (maybe) to distinguish a client is shallow or not and

    # then send that information to server whether we want ellipses or not.

    # Theoretically a non-ellipses repo should be able to use narrow

    # functionality from an ellipses enabled server

    ellipsesremote = wireprototypes.ELLIPSESCAP in remote.capabilities()

    def pullbundle2extraprepare_widen(orig, pullop, kwargs):

        orig(pullop, kwargs)

        # The old{in,ex}cludepats have already been set by orig()

        kwargs['includepats'] = newincludes

        kwargs['excludepats'] = newexcludes

    wrappedextraprepare = extensions.wrappedfunction(exchange,

        '_pullbundle2extraprepare', pullbundle2extraprepare_widen)

    # define a function that narrowbundle2 can call after creating the

    # backup bundle, but before applying the bundle from the server

    def setnewnarrowpats():

        repo.setnarrowpats(newincludes, newexcludes)

    repo.setnewnarrowpats = setnewnarrowpats

    # silence the devel-warning of applying an empty changegroup

    overrides = {('devel', 'all-warnings'): False}

    with ui.uninterruptable():

        common = commoninc[0]

        if ellipsesremote:

            ds = repo.dirstate

            p1, p2 = ds.p1(), ds.p2()

            with ds.parentchange():

                ds.setparents(node.nullid, node.nullid)

            with wrappedextraprepare,\

                 repo.ui.configoverride(overrides, 'widen'):

                exchange.pull(repo, remote, heads=common)

            with ds.parentchange():

                ds.setparents(p1, p2)

        else:

            with remote.commandexecutor() as e:

                bundle = e.callcommand('narrow_widen', {

                    'oldincludes': oldincludes,

                    'oldexcludes': oldexcludes,

                    'newincludes': newincludes,

                    'newexcludes': newexcludes,

                    'cgversion': '03',

                    'commonheads': common,

                    'known': [],

                    'ellipses': False,

                }).result()

            with repo.transaction('widening') as tr,\

                 repo.ui.configoverride(overrides, 'widen'):

                tgetter = lambda: tr

                bundle2.processbundle(repo, bundle,

                        transactiongetter=tgetter)

        repo.setnewnarrowpats()

        actions = {k: [] for k in 'a am f g cd dc r dm dg m e k p pr'.split()}

        addgaction = actions['g'].append

        mf = repo['.'].manifest().matches(newmatch)

        for f, fn in mf.iteritems():

            if f not in repo.dirstate:

                addgaction((f, (mf.flags(f), False),

                            "add from widened narrow clone"))

        merge.applyupdates(repo, actions, wctx=repo[None],

                           mctx=repo['.'], overwrite=False)

        merge.recordupdates(repo, actions, branchmerge=False)

# TODO(rdamazio): Make new matcher format and update description

@command('tracked',

    [('', 'addinclude', [], _('new paths to include')),

     ('', 'removeinclude', [], _('old paths to no longer include')),

     ('', 'addexclude', [], _('new paths to exclude')),

     ('', 'import-rules', '', _('import narrowspecs from a file')),

     ('', 'removeexclude', [], _('old paths to no longer exclude')),

     ('', 'clear', False, _('whether to replace the existing narrowspec')),

     ('', 'force-delete-local-changes', False,

       _('forces deletion of local changes when narrowing')),

    ] + commands.remoteopts,

    _('[OPTIONS]... [REMOTE]'),

    inferrepo=True)

def trackedcmd(ui, repo, remotepath=None, *pats, **opts):

    """show or change the current narrowspec

    With no argument, shows the current narrowspec entries, one per line. Each

    line will be prefixed with 'I' or 'X' for included or excluded patterns,

    respectively.

    The narrowspec is comprised of expressions to match remote files and/or

    directories that should be pulled into your client.

    The narrowspec has *include* and *exclude* expressions, with excludes always

    trumping includes: that is, if a file matches an exclude expression, it will

    be excluded even if it also matches an include expression.

    Excluding files that were never included has no effect.

    Each included or excluded entry is in the format described by

    'hg help patterns'.

    The options allow you to add or remove included and excluded expressions.

    If --clear is specified, then all previous includes and excludes are DROPPED

    and replaced by the new ones specified to --addinclude and --addexclude.

    If --clear is specified without any further options, the narrowspec will be

    empty and will not match any files.

    """

    opts = pycompat.byteskwargs(opts)

    if repository.NARROW_REQUIREMENT not in repo.requirements:

        ui.warn(_('The narrow command is only supported on respositories cloned'

                  ' with --narrow.\n'))

        return 1

    # Before supporting, decide whether it "hg tracked --clear" should mean

    # tracking no paths or all paths.

    if opts['clear']:

        ui.warn(_('The --clear option is not yet supported.\n'))

        return 1

    # import rules from a file

    newrules = opts.get('import_rules')