# hg backend for convert extension

# Notes for hg->hg conversion:

#

# * Old versions of Mercurial didn't trim the whitespace from the ends

#   of commit messages, but new versions do.  Changesets created by

#   those older versions, then converted, may thus have different

#   hashes for changesets that are otherwise identical.

#

# * By default, the source revision is stored in the converted

#   revision.  This will cause the converted revision to have a

#   different identity than the source.  To avoid this, use the

#   following option: "--config convert.hg.saverev=false"

import os, time

from mercurial.i18n import _

from mercurial.repo import RepoError

from mercurial.node import bin, hex, nullid

from mercurial import hg, revlog, util

from common import NoRepo, commit, converter_source, converter_sink

class mercurial_sink(converter_sink):

    def __init__(self, ui, path):

        converter_sink.__init__(self, ui, path)

        self.branchnames = ui.configbool('convert', 'hg.usebranchnames', True)

        self.clonebranches = ui.configbool('convert', 'hg.clonebranches', False)

        self.tagsbranch = ui.config('convert', 'hg.tagsbranch', 'default')

        self.lastbranch = None

        if os.path.isdir(path) and len(os.listdir(path)) > 0:

            try:

                self.repo = hg.repository(self.ui, path)

                if not self.repo.local():

                    raise NoRepo(_('%s is not a local Mercurial repo') % path)

            except RepoError, err:

                ui.print_exc()

                raise NoRepo(err.args[0])

        else:

            try:

                ui.status(_('initializing destination %s repository\n') % path)

                self.repo = hg.repository(self.ui, path, create=True)

                if not self.repo.local():

                    raise NoRepo(_('%s is not a local Mercurial repo') % path)

                self.created.append(path)

            except RepoError, err:

                ui.print_exc()

                raise NoRepo("could not create hg repo %s as sink" % path)

        self.lock = None

        self.wlock = None

        self.filemapmode = False

    def before(self):

        self.ui.debug(_('run hg sink pre-conversion action\n'))

        self.wlock = self.repo.wlock()

        self.lock = self.repo.lock()

        self.repo.dirstate.clear()

    def after(self):

        self.ui.debug(_('run hg sink post-conversion action\n'))

        self.repo.dirstate.invalidate()

        self.lock = None

        self.wlock = None

    def revmapfile(self):

        return os.path.join(self.path, ".hg", "shamap")

    def authorfile(self):

        return os.path.join(self.path, ".hg", "authormap")

    def getheads(self):

        h = self.repo.changelog.heads()

        return [ hex(x) for x in h ]

    def putfile(self, f, e, data):

        self.repo.wwrite(f, data, e)

        if f not in self.repo.dirstate:

            self.repo.dirstate.normallookup(f)

    def copyfile(self, source, dest):

        self.repo.copy(source, dest)

    def delfile(self, f):

        try:

            util.unlink(self.repo.wjoin(f))

            #self.repo.remove([f])

        except OSError:

            pass

    def setbranch(self, branch, pbranches):

        if not self.clonebranches:

            return

        setbranch = (branch != self.lastbranch)

        self.lastbranch = branch

        if not branch:

            branch = 'default'

        pbranches = [(b[0], b[1] and b[1] or 'default') for b in pbranches]

        pbranch = pbranches and pbranches[0][1] or 'default'

        branchpath = os.path.join(self.path, branch)

        if setbranch:

            self.after()

            try:

                self.repo = hg.repository(self.ui, branchpath)

            except:

                self.repo = hg.repository(self.ui, branchpath, create=True)

            self.before()

        # pbranches may bring revisions from other branches (merge parents)

        # Make sure we have them, or pull them.

        missings = {}

        for b in pbranches:

            try:

                self.repo.lookup(b[0])

            except:

                missings.setdefault(b[1], []).append(b[0])

        if missings:

            self.after()

            for pbranch, heads in missings.iteritems():

                pbranchpath = os.path.join(self.path, pbranch)

                prepo = hg.repository(self.ui, pbranchpath)

                self.ui.note(_('pulling from %s into %s\n') % (pbranch, branch))

                self.repo.pull(prepo, [prepo.lookup(h) for h in heads])

            self.before()

    def putcommit(self, files, parents, commit):

        seen = {}

        pl = []

        for p in parents:

            if p not in seen:

                pl.append(p)

                seen[p] = 1

        parents = pl

        nparents = len(parents)

        if self.filemapmode and nparents == 1:

            m1node = self.repo.changelog.read(bin(parents[0]))[0]

            parent = parents[0]

        if len(parents) < 2: parents.append("0" * 40)

        if len(parents) < 2: parents.append("0" * 40)

        p2 = parents.pop(0)

        text = commit.desc

        extra = commit.extra.copy()

        if self.branchnames and commit.branch:

            extra['branch'] = commit.branch

        if commit.rev:

            extra['convert_revision'] = commit.rev

        while parents:

            p1 = p2

            p2 = parents.pop(0)

            a = self.repo.rawcommit(files, text, commit.author, commit.date,

                                    bin(p1), bin(p2), extra=extra)

            self.repo.dirstate.clear()

            text = "(octopus merge fixup)\n"

            p2 = hex(self.repo.changelog.tip())

        if self.filemapmode and nparents == 1:

            man = self.repo.manifest

            mnode = self.repo.changelog.read(bin(p2))[0]

            if not man.cmp(m1node, man.revision(mnode)):

                self.repo.rollback()

                self.repo.dirstate.clear()

                return parent

        return p2

    def puttags(self, tags):

        try:

            old = self.repo.wfile(".hgtags").read()

            oldlines = old.splitlines(1)

            oldlines.sort()

        except:

            oldlines = []

        k = tags.keys()

        k.sort()

        newlines = []

        for tag in k:

            newlines.append("%s %s\n" % (tags[tag], tag))

        newlines.sort()

        if newlines != oldlines:

            self.ui.status("updating tags\n")

            f = self.repo.wfile(".hgtags", "w")

            f.write("".join(newlines))

            f.close()

            if not oldlines: self.repo.add([".hgtags"])

            date = "%s 0" % int(time.mktime(time.gmtime()))

            extra = {}

            if self.tagsbranch != 'default':

                extra['branch'] = self.tagsbranch

            try:

                tagparent = self.repo.changectx(self.tagsbranch).node()

            except RepoError, inst:

                tagparent = nullid

            self.repo.rawcommit([".hgtags"], "update tags", "convert-repo",

                                date, tagparent, nullid, extra=extra)

            return hex(self.repo.changelog.tip())

    def setfilemapmode(self, active):

        self.filemapmode = active

class mercurial_source(converter_source):

    def __init__(self, ui, path, rev=None):

        converter_source.__init__(self, ui, path, rev)

        self.saverev = ui.configbool('convert', 'hg.saverev', True)

        try:

            self.repo = hg.repository(self.ui, path)

            # try to provoke an exception if this isn't really a hg

            # repo, but some other bogus compatible-looking url

            if not self.repo.local():

                raise RepoError()

        except RepoError:

            ui.print_exc()

            raise NoRepo("%s is not a local Mercurial repo" % path)

        self.lastrev = None

        self.lastctx = None

        self._changescache = None

        self.convertfp = None

    def changectx(self, rev):

        if self.lastrev != rev:

            self.lastctx = self.repo.changectx(rev)

            self.lastrev = rev

        return self.lastctx

    def getheads(self):

        if self.rev:

            return [hex(self.repo.changectx(self.rev).node())]

        else:

            return [hex(node) for node in self.repo.heads()]

    def getfile(self, name, rev):

        try:

            return self.changectx(rev).filectx(name).data()

        except revlog.LookupError, err:

            raise IOError(err)

    def getmode(self, name, rev):

        m = self.changectx(rev).manifest()

        return (m.execf(name) and 'x' or '') + (m.linkf(name) and 'l' or '')

    def getchanges(self, rev):

        ctx = self.changectx(rev)

        if self._changescache and self._changescache[0] == rev:

            m, a, r = self._changescache[1]

        else:

            m, a, r = self.repo.status(ctx.parents()[0].node(), ctx.node())[:3]

        changes = [(name, rev) for name in m + a + r]

        changes.sort()

        return (changes, self.getcopies(ctx, m + a))

    def getcopies(self, ctx, files):

        copies = {}

        for name in files:

            try:

                copies[name] = ctx.filectx(name).renamed()[0]

            except TypeError:

                pass

        return copies

    def getcommit(self, rev):

        ctx = self.changectx(rev)

        parents = [hex(p.node()) for p in ctx.parents() if p.node() != nullid]

        if self.saverev:

            crev = rev

        else:

            crev = None

        return commit(author=ctx.user(), date=util.datestr(ctx.date()),

                      desc=ctx.description(), rev=crev, parents=parents,

                      branch=ctx.branch(), extra=ctx.extra())

    def gettags(self):

        tags = [t for t in self.repo.tagslist() if t[0] != 'tip']

        return dict([(name, hex(node)) for name, node in tags])

    def getchangedfiles(self, rev, i):

        ctx = self.changectx(rev)

        i = i or 0

        changes = self.repo.status(ctx.parents()[i].node(), ctx.node())[:3]

        if i == 0:

            self._changescache = (rev, changes)

        return changes[0] + changes[1] + changes[2]

    def converted(self, rev, destrev):

        if self.convertfp is None:

            self.convertfp = open(os.path.join(self.path, '.hg', 'shamap'),

                                  'a')

        self.convertfp.write('%s %s\n' % (destrev, rev))

        self.convertfp.flush()

    def before(self):

        self.ui.debug(_('run hg source pre-conversion action\n'))

    def after(self):

        self.ui.debug(_('run hg source post-conversion action\n'))