/brz/remove-bazaar

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

#

# 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

"""Git Trees."""

from dulwich.object_store import tree_lookup_path

import stat

from bzrlib import (

    delta,

    errors,

    revisiontree,

    tree,

    )

from bzrlib.plugins.git.mapping import (

    mode_is_executable,

    mode_kind,

    )

class GitRevisionTree(revisiontree.RevisionTree):

    """Revision tree implementation based on Git objects."""

    def __init__(self, repository, revision_id):

        self._revision_id = revision_id

        self._repository = repository

        self.store = repository._git.object_store

        assert isinstance(revision_id, str)

        git_id, self.mapping = repository.lookup_bzr_revision_id(revision_id)

        try:

            commit = self.store[git_id]

        except KeyError, r:

            raise errors.NoSuchRevision(repository, revision_id)

        self.tree = commit.tree

        self.fileid_map = self.mapping.get_fileid_map(self.store.__getitem__, self.tree)

    def id2path(self, file_id):

        return self.fileid_map.lookup_path(file_id)

    def path2id(self, path):

        return self.fileid_map.lookup_file_id(path.encode('utf-8'))

    def get_revision_id(self):

        """See RevisionTree.get_revision_id."""

        return self._revision_id

    def get_file_text(self, file_id, path=None):

        """See RevisionTree.get_file_text."""

        if path is None:

            path = self.id2path(file_id)

        (mode, hexsha)= tree_lookup_path(self.store.__getitem__, self.tree, path)

        if stat.S_ISREG(mode):

            return self.store[hexsha].data

        else:

            return ""

def tree_delta_from_git_changes(changes, mapping,

        (old_fileid_map, new_fileid_map), specific_file=None,

        require_versioned=False):

    """Create a TreeDelta from two git trees.

    source and target are iterators over tuples with:

        (filename, sha, mode)

    """

    ret = delta.TreeDelta()

    for (oldpath, newpath), (oldmode, newmode), (oldsha, newsha) in changes:

        if mapping.is_control_file(oldpath):

            oldpath = None

        if mapping.is_control_file(newpath):

            newpath = None

        if oldpath is None and newpath is None:

            continue

        if oldpath is None:

            ret.added.append((newpath, new_fileid_map.lookup_file_id(newpath.encode("utf-8")), mode_kind(newmode)))

        elif newpath is None:

            ret.removed.append((oldpath, old_fileid_map.lookup_file_id(oldpath.encode("utf-8")), mode_kind(oldmode)))

        elif oldpath != newpath:

            ret.renamed.append((oldpath, newpath, old_fileid_map.lookup_file_id(oldpath.encode("utf-8")), mode_kind(newmode), (oldsha != newsha), (oldmode != newmode)))

        elif mode_kind(oldmode) != mode_kind(newmode):

            ret.kind_changed.append((newpath, new_fileid_map.lookup_file_id(newpath.encode("utf-8")), mode_kind(oldmode), mode_kind(newmode)))

        elif oldsha != newsha or oldmode != newmode:

            ret.modified.append((newpath, new_fileid_map.lookup_file_id(newpath.encode("utf-8")), mode_kind(newmode), (oldsha != newsha), (oldmode != newmode)))

        else:

            ret.unchanged.append((newpath, new_fileid_map.lookup_file_id(newpath.encode("utf-8")), mode_kind(newmode)))

    return ret

def changes_from_git_changes(changes, mapping, specific_file=None,

                                require_versioned=False):

    """Create a iter_changes-like generator from a git stream.

    source and target are iterators over tuples with:

        (filename, sha, mode)

    """

    for (oldpath, newpath), (oldmode, newmode), (oldsha, newsha) in changes:

        path = (oldpath, newpath)

        if oldpath is None:

            fileid = mapping.generate_file_id(newpath)

            oldexe = None

            oldkind = None

            oldname = None

            oldparent = None

        else:

            oldexe = mode_is_executable(oldmode)

            oldkind = mode_kind(oldmode)

            try:

                (oldparentpath, oldname) = oldpath.rsplit("/", 1)

            except ValueError:

                oldparent = None

                oldname = oldpath

            else:

                oldparent = mapping.generate_file_id(oldparentpath)

            fileid = mapping.generate_file_id(oldpath)

        if newpath is None:

            newexe = None

            newkind = None

            newname = None

            newparent = None

        else:

            newexe = mode_is_executable(newmode)

            newkind = mode_kind(newmode)

            try:

                newparentpath, newname = newpath.rsplit("/", 1)

            except ValueError:

                newparent = None

                newname = newpath

            else:

                newparent = mapping.generate_file_id(newparentpath)

        yield (fileid, (oldpath, newpath), (oldsha != newsha),

             (oldpath is not None, newpath is not None),

             (oldparent, newparent), (oldname, newname),

             (oldkind, newkind), (oldexe, newexe))

class InterGitRevisionTrees(tree.InterTree):

    """InterTree that works between two git revision trees."""

    _matching_from_tree_format = None

    _matching_to_tree_format = None

    _test_mutable_trees_to_test_trees = None

    @classmethod

    def is_compatible(cls, source, target):

        return (isinstance(source, GitRevisionTree) and

                isinstance(target, GitRevisionTree))

    def compare(self, want_unchanged=False, specific_files=None,

                extra_trees=None, require_versioned=False, include_root=False,

                want_unversioned=False):

        if self.source._repository._git.object_store != self.target._repository._git.object_store:

            raise AssertionError

        changes = self.source._repository._git.object_store.tree_changes(

            self.source.tree, self.target.tree, want_unchanged=want_unchanged)

        source_fileid_map = self.source.mapping.get_fileid_map(

            self.source._repository._git.object_store.__getitem__,

            self.source.tree)

        target_fileid_map = self.target.mapping.get_fileid_map(

            self.target._repository._git.object_store.__getitem__,

            self.target.tree)

        return tree_delta_from_git_changes(changes, self.target.mapping,

            (source_fileid_map, target_fileid_map),

            specific_file=specific_files)

    def iter_changes(self, include_unchanged=False, specific_files=None,

        pb=None, extra_trees=[], require_versioned=True,

        want_unversioned=False):

        if self.source._repository._git.object_store != self.target._repository._git.object_store:

            raise AssertionError

        changes = self.source._repository._git.object_store.tree_changes(

            self.source.tree, self.target.tree,

            want_unchanged=include_unchanged)

        return changes_from_git_changes(changes, self.target.mapping,

            specific_file=specific_files)

tree.InterTree.register_optimiser(InterGitRevisionTrees)