/brz/remove-bazaar

# Copyright (C) 2007 Canonical Ltd

# Copyright (C) 2008-2009 Jelmer Vernooij <jelmer@samba.org>

# Copyright (C) 2008 John Carr

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Converters, etc for going between Bazaar and Git ids."""

from bzrlib import (

    errors,

    foreign,

    urlutils,

    )

from bzrlib.inventory import (

    ROOT_ID,

    )

from bzrlib.foreign import (

    ForeignVcs, 

    VcsMappingRegistry, 

    ForeignRevision,

    )

from bzrlib.plugins.git.foreign import (

    escape_commit_message,

    )

def escape_file_id(file_id):

    return file_id.replace('_', '__').replace(' ', '_s')

def unescape_file_id(file_id):

    return file_id.replace("_s", " ").replace("__", "_")

class BzrGitMapping(foreign.VcsMapping):

    """Class that maps between Git and Bazaar semantics."""

    experimental = False

    def __init__(self):

        super(BzrGitMapping, self).__init__(foreign_git)

    def __eq__(self, other):

        return type(self) == type(other) and self.revid_prefix == other.revid_prefix

    @classmethod

    def revision_id_foreign_to_bzr(cls, git_rev_id):

        """Convert a git revision id handle to a Bazaar revision id."""

        return "%s:%s" % (cls.revid_prefix, git_rev_id)

    @classmethod

    def revision_id_bzr_to_foreign(cls, bzr_rev_id):

        """Convert a Bazaar revision id to a git revision id handle."""

        if not bzr_rev_id.startswith("%s:" % cls.revid_prefix):

            raise errors.InvalidRevisionId(bzr_rev_id, cls)

        return bzr_rev_id[len(cls.revid_prefix)+1:], cls()

    def generate_file_id(self, path):

        # Git paths are just bytestrings

        # We must just hope they are valid UTF-8..

        assert isinstance(path, str)

        if path == "":

            return ROOT_ID

        return escape_file_id(path)

    def parse_file_id(self, file_id):

        if file_id == ROOT_ID:

            return ""

        return unescape_file_id(file_id)

    def import_commit(self, commit):

        """Convert a git commit to a bzr revision.

        :return: a `bzrlib.revision.Revision` object.

        """

        if commit is None:

            raise AssertionError("Commit object can't be None")

        rev = ForeignRevision(commit.id, self, self.revision_id_foreign_to_bzr(commit.id))

        rev.parent_ids = tuple([self.revision_id_foreign_to_bzr(p) for p in commit.parents])

        rev.message = escape_commit_message(commit.message.decode("utf-8", "replace"))

        rev.committer = escape_commit_message(str(commit.committer).decode("utf-8", "replace"))

        if commit.committer != commit.author:

            rev.properties['author'] = escape_commit_message(str(commit.author).decode("utf-8", "replace"))

        rev.timestamp = commit.commit_time

        rev.timezone = 0

        return rev

class BzrGitMappingv1(BzrGitMapping):

    revid_prefix = 'git-v1'

    experimental = False

class BzrGitMappingExperimental(BzrGitMappingv1):

    revid_prefix = 'git-experimental'

    experimental = True

class GitMappingRegistry(VcsMappingRegistry):

    def revision_id_bzr_to_foreign(self, bzr_revid):

        if not bzr_revid.startswith("git-"):

            raise errors.InvalidRevisionId(bzr_revid, None)

        (mapping_version, git_sha) = bzr_revid.split(":", 1)

        mapping = self.get(mapping_version)

        return mapping.revision_id_bzr_to_foreign(bzr_revid)

    parse_revision_id = revision_id_bzr_to_foreign

mapping_registry = GitMappingRegistry()

mapping_registry.register_lazy('git-v1', "bzrlib.plugins.git.mapping",

                                   "BzrGitMappingv1")

mapping_registry.register_lazy('git-experimental', "bzrlib.plugins.git.mapping",

                                   "BzrGitMappingExperimental")

class ForeignGit(ForeignVcs):

    """Foreign Git."""

    def __init__(self):

        super(ForeignGit, self).__init__(mapping_registry)

    @classmethod

    def show_foreign_revid(cls, foreign_revid):

        return { "git commit": foreign_revid }

foreign_git = ForeignGit()

default_mapping = BzrGitMappingv1()

def text_to_blob(text):

    from dulwich.objects import Blob

    blob = Blob()

    blob._text = text

    return blob

def inventory_to_tree_and_blobs(repo, mapping, revision_id):

    from dulwich.objects import Tree

    from bzrlib.inventory import InventoryDirectory, InventoryFile

    import stat

    stack = []

    cur = ""

    tree = Tree()

    inv = repo.get_inventory(revision_id)

    # stack contains the set of trees that we haven't 

    # finished constructing

    for path, entry in inv.iter_entries():

        while stack and not path.startswith(cur):

            tree.serialize()

            sha = tree.id

            yield sha, tree, cur

            t = (stat.S_IFDIR, urlutils.basename(cur).encode('UTF-8'), sha)

            cur, tree = stack.pop()

            tree.add(*t)

        if type(entry) == InventoryDirectory:

            stack.append((cur, tree))

            cur = path

            tree = Tree()

        if type(entry) == InventoryFile:

            #FIXME: We can make potentially make this Lazy to avoid shaing lots of stuff

            # and having all these objects in memory at once

            text = repo.texts.get_record_stream([(entry.file_id, entry.revision)], 'unordered', True).next().get_bytes_as('fulltext')

            blob = text_to_blob(text)

            sha = blob.id

            yield sha, blob, path

            name = urlutils.basename(path).encode("utf-8")

            mode = stat.S_IFREG | 0644

            if entry.executable:

                mode |= 0111

            tree.add(mode, name, sha)

    while len(stack) > 1:

        tree.serialize()

        sha = tree.id

        yield sha, tree, cur

        t = (stat.S_IFDIR, urlutils.basename(cur).encode('UTF-8'), sha)

        cur, tree = stack.pop()

        tree.add(*t)

    tree.serialize()

    yield tree.id, tree, cur

def revision_to_commit(rev, tree_sha, parent_lookup):

    """Turn a Bazaar revision in to a Git commit

    :param tree_sha: Tree sha for the commit

    :param parent_lookup: Function for looking up the GIT sha equiv of a bzr revision

    :return dulwich.objects.Commit represent the revision:

    """

    from dulwich.objects import Commit

    commit = Commit()

    commit._tree = tree_sha

    for p in rev.parent_ids:

        git_p = parent_lookup(p)

        if git_p is not None:

            assert len(git_p) == 40, "unexpected length for %r" % git_p

            commit._parents.append(git_p)

    commit._message = rev.message.encode("utf-8")

    commit._committer = rev.committer.encode("utf-8")

    commit._author = rev.get_apparent_authors()[0].encode("utf-8")

    commit._commit_time = long(rev.timestamp)

    commit.serialize()

    return commit