/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 bzrlib import (

    delta,

    errors,

    revisiontree,

    tree,

    )

from bzrlib.plugins.git.inventory import (

    GitInventory,

    )

from bzrlib.plugins.git.mapping import (

    mode_is_executable,

    mode_kind,

    )

class GitRevisionTree(revisiontree.RevisionTree):

    def __init__(self, repository, revision_id):

        self._revision_id = revision_id

        self._repository = repository

        store = repository._git.object_store

        assert isinstance(revision_id, str)

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

        try:

            commit = store[git_id]

        except KeyError, r:

            raise errors.NoSuchRevision(repository, revision_id)

        self.tree = commit.tree

        self._inventory = GitInventory(self.tree, self.mapping, store, 

                                       revision_id)

    def get_revision_id(self):

        return self._revision_id

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

        if path is not None:

            entry = self._inventory._get_ie(path)

        else:

            entry = self._inventory[file_id]

        if entry.kind == 'directory': return ""

        return entry.object.data

def tree_delta_from_git_changes(changes, mapping, 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 oldpath is None:

            ret.added.append((newpath, mapping.generate_file_id(newpath), mode_kind(newmode)))

        elif newpath is None:

            ret.removed.append((oldpath, mapping.generate_file_id(oldpath), mode_kind(oldmode)))

        elif oldpath != newpath:

            ret.renamed.append((oldpath, newpath, mapping.generate_file_id(oldpath), mode_kind(newmode), (oldsha != newsha), (oldmode != newmode)))

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

            ret.kind_changed.append((newpath, mapping.generate_file_id(newpath), mode_kind(oldmode), mode_kind(newmode)))

        elif oldsha != newsha or oldmode != newmode:

            ret.modified.append((newpath, mapping.generate_file_id(newpath), mode_kind(newmode), (oldsha != newsha), (oldmode != newmode)))

        else:

            ret.unchanged.append((newpath, mapping.generate_file_id(newpath), 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."""

    @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)

        return tree_delta_from_git_changes(changes, self.target.mapping, 

            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)