# Copyright 2009-2010 Gregory P. Ward

# Copyright 2009-2010 Intelerad Medical Systems Incorporated

# Copyright 2010-2011 Fog Creek Software

# Copyright 2010-2011 Unity Technologies

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

'''setup for largefiles repositories: reposetup'''

import copy

import types

import os

from mercurial import context, error, manifest, match as match_, util

from mercurial import node as node_

from mercurial.i18n import _

import lfcommands

import proto

import lfutil

def reposetup(ui, repo):

    # wire repositories should be given new wireproto functions but not the

    # other largefiles modifications

    if not repo.local():

        return proto.wirereposetup(ui, repo)

    for name in ('status', 'commitctx', 'commit', 'push'):

        method = getattr(repo, name)

        if (isinstance(method, types.FunctionType) and

            method.func_name == 'wrap'):

            ui.warn(_('largefiles: repo method %r appears to have already been'

                    ' wrapped by another extension: '

                    'largefiles may behave incorrectly\n')

                    % name)

    class lfiles_repo(repo.__class__):

        lfstatus = False

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

            return super(lfiles_repo, self).status(*args, **kwargs)

        # When lfstatus is set, return a context that gives the names

        # of largefiles instead of their corresponding standins and

        # identifies the largefiles as always binary, regardless of

        # their actual contents.

        def __getitem__(self, changeid):

            ctx = super(lfiles_repo, self).__getitem__(changeid)

            if self.lfstatus:

                class lfiles_manifestdict(manifest.manifestdict):

                    def __contains__(self, filename):

                        if super(lfiles_manifestdict,

                                self).__contains__(filename):

                            return True

                        return super(lfiles_manifestdict,

                            self).__contains__(lfutil.standin(filename))

                class lfiles_ctx(ctx.__class__):

                    def files(self):

                        filenames = super(lfiles_ctx, self).files()

                        return [lfutil.splitstandin(f) or f for f in filenames]

                    def manifest(self):

                        man1 = super(lfiles_ctx, self).manifest()

                        man1.__class__ = lfiles_manifestdict

                        return man1

                    def filectx(self, path, fileid=None, filelog=None):

                        try:

                            result = super(lfiles_ctx, self).filectx(path,

                                fileid, filelog)

                        except error.LookupError:

                            # Adding a null character will cause Mercurial to

                            # identify this as a binary file.

                            result = super(lfiles_ctx, self).filectx(

                                lfutil.standin(path), fileid, filelog)

                            olddata = result.data

                            result.data = lambda: olddata() + '\0'

                        return result

                ctx.__class__ = lfiles_ctx

            return ctx

        # Figure out the status of big files and insert them into the

        # appropriate list in the result. Also removes standin files

        # from the listing. Revert to the original status if

        # self.lfstatus is False.

        def status(self, node1='.', node2=None, match=None, ignored=False,

                clean=False, unknown=False, listsubrepos=False):

            listignored, listclean, listunknown = ignored, clean, unknown

            if not self.lfstatus:

                return super(lfiles_repo, self).status(node1, node2, match,

                    listignored, listclean, listunknown, listsubrepos)

            else:

                # some calls in this function rely on the old version of status

                self.lfstatus = False

                if isinstance(node1, context.changectx):

                    ctx1 = node1

                else:

                    ctx1 = repo[node1]

                if isinstance(node2, context.changectx):

                    ctx2 = node2

                else:

                    ctx2 = repo[node2]

                working = ctx2.rev() is None

                parentworking = working and ctx1 == self['.']

                def inctx(file, ctx):

                    try:

                        if ctx.rev() is None:

                            return file in ctx.manifest()

                        ctx[file]

                        return True

                    except KeyError:

                        return False

                if match is None:

                    match = match_.always(self.root, self.getcwd())

                # First check if there were files specified on the

                # command line.  If there were, and none of them were

                # largefiles, we should just bail here and let super

                # handle it -- thus gaining a big performance boost.

                lfdirstate = lfutil.openlfdirstate(ui, self)

                if match.files() and not match.anypats():

                        return super(lfiles_repo, self).status(node1, node2,

                                match, listignored, listclean,

                                listunknown, listsubrepos)

                # Create a copy of match that matches standins instead

                # of largefiles.

                def tostandin(file):

                    if inctx(lfutil.standin(file), ctx2):

                        return lfutil.standin(file)

                    return file

                # Create a function that we can use to override what is

                # normally the ignore matcher.  We've already checked

                # for ignored files on the first dirstate walk, and

                # unecessarily re-checking here causes a huge performance

                # hit because lfdirstate only knows about largefiles

                def _ignoreoverride(self):

                    return False

                m = copy.copy(match)

                m._files = [tostandin(f) for f in m._files]

                # Get ignored files here even if we weren't asked for them; we

                # must use the result here for filtering later

                result = super(lfiles_repo, self).status(node1, node2, m,

                    True, clean, unknown, listsubrepos)

                if working:

                    try:

                        # Any non-largefiles that were explicitly listed must be

                        # taken out or lfdirstate.status will report an error.

                        # The status of these files was already computed using

                        # super's status.

                        # Override lfdirstate's ignore matcher to not do

                        # anything

                        orig_ignore = lfdirstate._ignore

                        lfdirstate._ignore = _ignoreoverride

                        match._files = [f for f in match._files if f in

                            lfdirstate]

                        # Don't waste time getting the ignored and unknown

                        # files again; we already have them

                        s = lfdirstate.status(match, [], False,

                                listclean, False)

                        (unsure, modified, added, removed, missing, unknown,

                                ignored, clean) = s

                        # Replace the list of ignored and unknown files with

                        # the previously caclulated lists, and strip out the

                        # largefiles

                        lfiles = set(lfdirstate._map)

                        ignored = set(result[5]).difference(lfiles)

                        unknown = set(result[4]).difference(lfiles)

                        if parentworking:

                            for lfile in unsure:

                                standin = lfutil.standin(lfile)

                                if standin not in ctx1:

                                    # from second parent

                                    modified.append(lfile)

                                elif ctx1[standin].data().strip() \

                                        != lfutil.hashfile(self.wjoin(lfile)):

                                    modified.append(lfile)

                                else:

                                    clean.append(lfile)

                                    lfdirstate.normal(lfile)

                        else:

                            tocheck = unsure + modified + added + clean

                            modified, added, clean = [], [], []

                            for lfile in tocheck:

                                standin = lfutil.standin(lfile)

                                if inctx(standin, ctx1):

                                    if ctx1[standin].data().strip() != \

                                            lfutil.hashfile(self.wjoin(lfile)):

                                        modified.append(lfile)

                                    else:

                                        clean.append(lfile)

                                else:

                                    added.append(lfile)

                    finally:

                        # Replace the original ignore function

                        lfdirstate._ignore = orig_ignore

                    for standin in ctx1.manifest():

                        if not lfutil.isstandin(standin):

                            continue

                        lfile = lfutil.splitstandin(standin)

                        if not match(lfile):

                            continue

                        if lfile not in lfdirstate:

                            removed.append(lfile)

                    # Filter result lists

                    result = list(result)

                    # Largefiles are not really removed when they're

                    # still in the normal dirstate. Likewise, normal

                    # files are not really removed if it's still in

                    # lfdirstate. This happens in merges where files

                    # change type.

                    removed = [f for f in removed if f not in repo.dirstate]

                    result[2] = [f for f in result[2] if f not in lfdirstate]

                    # Unknown files

                    unknown = set(unknown).difference(ignored)

                    result[4] = [f for f in unknown

                                 if (repo.dirstate[f] == '?' and

                                     not lfutil.isstandin(f))]

                    # Ignored files were calculated earlier by the dirstate,

                    # and we already stripped out the largefiles from the list

                    result[5] = ignored

                    # combine normal files and largefiles

                    normals = [[fn for fn in filelist

                                if not lfutil.isstandin(fn)]

                               for filelist in result]

                    lfiles = (modified, added, removed, missing, [], [], clean)

                    result = [sorted(list1 + list2)

                              for (list1, list2) in zip(normals, lfiles)]

                else:

                    def toname(f):

                        if lfutil.isstandin(f):

                            return lfutil.splitstandin(f)

                        return f

                    result = [[toname(f) for f in items] for items in result]

                if not listunknown:

                    result[4] = []

                if not listignored:

                    result[5] = []

                if not listclean:

                    result[6] = []

                self.lfstatus = True

                return result

        # As part of committing, copy all of the largefiles into the

        # cache.

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

            node = super(lfiles_repo, self).commitctx(*args, **kwargs)

            lfutil.copyalltostore(self, node)

            return node

        # Before commit, largefile standins have not had their

        # contents updated to reflect the hash of their largefile.

        # Do that here.

        def commit(self, text="", user=None, date=None, match=None,

                force=False, editor=False, extra={}):

            orig = super(lfiles_repo, self).commit

            wlock = repo.wlock()

            try:

                # Case 0: Rebase or Transplant

                # We have to take the time to pull down the new largefiles now.

                # Otherwise, any largefiles that were modified in the

                # destination changesets get overwritten, either by the rebase

                # or in the first commit after the rebase or transplant.

                # updatelfiles will update the dirstate to mark any pulled

                # largefiles as modified

                if getattr(repo, "_isrebasing", False) or \

                        getattr(repo, "_istransplanting", False):

                    lfcommands.updatelfiles(repo.ui, repo, filelist=None,

                                            printmessage=False)

                    result = orig(text=text, user=user, date=date, match=match,

                                    force=force, editor=editor, extra=extra)

                    return result

                # Case 1: user calls commit with no specific files or

                # include/exclude patterns: refresh and commit all files that

                # are "dirty".

                if ((match is None) or

                    (not match.anypats() and not match.files())):

                    # Spend a bit of time here to get a list of files we know

                    # are modified so we can compare only against those.

                    # It can cost a lot of time (several seconds)

                    # otherwise to update all standins if the largefiles are

                    # large.

                    lfdirstate = lfutil.openlfdirstate(ui, self)

                    dirtymatch = match_.always(repo.root, repo.getcwd())

                    s = lfdirstate.status(dirtymatch, [], False, False, False)

                    modifiedfiles = []

                    for i in s:

                        modifiedfiles.extend(i)

                    lfiles = lfutil.listlfiles(self)

                    # this only loops through largefiles that exist (not

                    # removed/renamed)

                    for lfile in lfiles:

                        if lfile in modifiedfiles:

                            if os.path.exists(self.wjoin(lfutil.standin(lfile))):

                                # this handles the case where a rebase is being

                                # performed and the working copy is not updated

                                # yet.

                                if os.path.exists(self.wjoin(lfile)):

                                    lfutil.updatestandin(self,

                                        lfutil.standin(lfile))

                                    lfdirstate.normal(lfile)

                    for lfile in lfdirstate:

                        if lfile in modifiedfiles:

                            if not os.path.exists(

                                    repo.wjoin(lfutil.standin(lfile))):

                                lfdirstate.drop(lfile)

                    result = orig(text=text, user=user, date=date, match=match,

                                    force=force, editor=editor, extra=extra)

                    # This needs to be after commit; otherwise precommit hooks

                    # get the wrong status

                    lfdirstate.write()

                    return result

                for f in match.files():

                    if lfutil.isstandin(f):

                        raise util.Abort(

                            _('file "%s" is a largefile standin') % f,

                            hint=('commit the largefile itself instead'))

                # Case 2: user calls commit with specified patterns: refresh

                # any matching big files.

                smatcher = lfutil.composestandinmatcher(self, match)

                standins = lfutil.dirstate_walk(self.dirstate, smatcher)

                # No matching big files: get out of the way and pass control to

                # the usual commit() method.

                if not standins:

                    return orig(text=text, user=user, date=date, match=match,

                                    force=force, editor=editor, extra=extra)

                # Refresh all matching big files.  It's possible that the

                # commit will end up failing, in which case the big files will

                # stay refreshed.  No harm done: the user modified them and

                # asked to commit them, so sooner or later we're going to

                # refresh the standins.  Might as well leave them refreshed.

                lfdirstate = lfutil.openlfdirstate(ui, self)

                for standin in standins:

                    lfile = lfutil.splitstandin(standin)

                    if lfdirstate[lfile] <> 'r':

                        lfutil.updatestandin(self, standin)

                        lfdirstate.normal(lfile)

                    else:

                        lfdirstate.drop(lfile)

                # Cook up a new matcher that only matches regular files or

                # standins corresponding to the big files requested by the

                # user.  Have to modify _files to prevent commit() from

                # complaining "not tracked" for big files.

                lfiles = lfutil.listlfiles(repo)

                match = copy.copy(match)

                orig_matchfn = match.matchfn

                # Check both the list of largefiles and the list of

                # standins because if a largefile was removed, it

                # won't be in the list of largefiles at this point

                match._files += sorted(standins)

                actualfiles = []

                for f in match._files:

                    fstandin = lfutil.standin(f)

                    # ignore known largefiles and standins

                    if f in lfiles or fstandin in standins:

                        continue

                    # append directory separator to avoid collisions

                    if not fstandin.endswith(os.sep):

                        fstandin += os.sep