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#! /usr/bin/env python
# -*- coding: UTF-8 -*-
# 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
from sets import Set
from trace import mutter
def diff_trees(old_tree, new_tree):
"""Compute diff between two trees.
They may be in different branches and may be working or historical
trees.
Yields a sequence of (state, id, old_name, new_name, kind).
Each filename and each id is listed only once.
"""
## TODO: Compare files before diffing; only mention those that have changed
## TODO: Set nice names in the headers, maybe include diffstat
## TODO: Perhaps make this a generator rather than using
## a callback object?
## TODO: Allow specifying a list of files to compare, rather than
## doing the whole tree? (Not urgent.)
## TODO: Allow diffing any two inventories, not just the
## current one against one. We mgiht need to specify two
## stores to look for the files if diffing two branches. That
## might imply this shouldn't be primarily a Branch method.
## XXX: This doesn't report on unknown files; that can be done
## from a separate method.
old_it = old_tree.list_files()
new_it = new_tree.list_files()
def next(it):
try:
return it.next()
except StopIteration:
return None
old_item = next(old_it)
new_item = next(new_it)
# We step through the two sorted iterators in parallel, trying to
# keep them lined up.
while (old_item != None) or (new_item != None):
# OK, we still have some remaining on both, but they may be
# out of step.
if old_item != None:
old_name, old_class, old_kind, old_id = old_item
else:
old_name = None
if new_item != None:
new_name, new_class, new_kind, new_id = new_item
else:
new_name = None
mutter(" diff pairwise %r" % (old_item,))
mutter(" %r" % (new_item,))
if old_item:
# can't handle the old tree being a WorkingTree
assert old_class == 'V'
if new_item and (new_class != 'V'):
yield new_class, None, None, new_name, new_kind
new_item = next(new_it)
elif (not new_item) or (old_item and (old_name < new_name)):
mutter(" extra entry in old-tree sequence")
if new_tree.has_id(old_id):
# will be mentioned as renamed under new name
pass
else:
yield 'D', old_id, old_name, None, old_kind
old_item = next(old_it)
elif (not old_item) or (new_item and (new_name < old_name)):
mutter(" extra entry in new-tree sequence")
if old_tree.has_id(new_id):
yield 'R', new_id, old_tree.id2path(new_id), new_name, new_kind
else:
yield 'A', new_id, None, new_name, new_kind
new_item = next(new_it)
elif old_id != new_id:
assert old_name == new_name
# both trees have a file of this name, but it is not the
# same file. in other words, the old filename has been
# overwritten by either a newly-added or a renamed file.
# (should we return something about the overwritten file?)
if old_tree.has_id(new_id):
# renaming, overlying a deleted file
yield 'R', new_id, old_tree.id2path(new_id), new_name, new_kind
else:
yield 'A', new_id, None, new_name, new_kind
new_item = next(new_it)
old_item = next(old_it)
else:
assert old_id == new_id
assert old_name == new_name
assert old_kind == new_kind
if old_kind == 'directory':
yield '.', new_id, old_name, new_name, new_kind
elif old_tree.get_file_size(old_id) != new_tree.get_file_size(old_id):
mutter(" file size has changed, must be different")
yield 'M', new_id, old_name, new_name, new_kind
elif old_tree.get_file_sha1(old_id) == new_tree.get_file_sha1(old_id):
mutter(" SHA1 indicates they're identical")
## assert compare_files(old_tree.get_file(i), new_tree.get_file(i))
yield '.', new_id, old_name, new_name, new_kind
else:
mutter(" quick compare shows different")
yield 'M', new_id, old_name, new_name, new_kind
new_item = next(new_it)
old_item = next(old_it)
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