/brz/remove-bazaar

#!/usr/bin/env python2.4

# Copyright (C) 2006 by Canonical Ltd

#

# 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

import difflib

from StringIO import StringIO

from subprocess import Popen, PIPE

from tempfile import mkdtemp

from bzrlib.branch import Branch

from bzrlib.patiencediff import SequenceMatcher

from bzrlib.diff import internal_diff

from bzrlib.osutils import pathjoin

def patch(path, patch_lines):

    """Apply a patch to a branch, using patch(1).  URLs may be used."""

    cmd = ['patch', '--quiet', path]

    r = 0

    child_proc = Popen(cmd, stdin=PIPE)

    for line in patch_lines:

        child_proc.stdin.write(line)

    child_proc.stdin.close()

    r = child_proc.wait()

    return r

old_total = 0

new_total = 0

b = Branch.open_containing('.')[0]

repo = b.repository

repo.lock_write()

try:

    temp_dir = mkdtemp()

    transaction = repo.get_transaction()

    file_list = list(repo.text_store)

    for i, file_id in enumerate(file_list):

        print "%.2f%% %d of %d %s" % ((float(i)/len(file_list) * 100), i,

                                    len(file_list), file_id)

        versioned_file = repo.text_store.get_weave(file_id, transaction)

        last_id = None

        for revision_id in versioned_file.versions():

            if last_id != None:

                old_lines = versioned_file.get_lines(last_id)

                new_lines = versioned_file.get_lines(revision_id)

                if ''.join(old_lines) == ''.join(new_lines):

                    continue

                new_patch = StringIO()

                try:

                    internal_diff('old', old_lines, 'new', new_lines, new_patch,

                                  sequence_matcher=SequenceMatcher)

                except:

                    file(pathjoin(temp_dir, 'old'), 

                         'wb').write(''.join(old_lines))

                    file(pathjoin(temp_dir, 'new'), 

                         'wb').write(''.join(new_lines))

                    print "temp dir is %s" % temp_dir

                    raise

                old_patch = StringIO()

                internal_diff('old', old_lines, 'new', new_lines, old_patch,

                              sequence_matcher=difflib.SequenceMatcher)

                old_total += len(old_patch.getvalue())

                new_total += len(new_patch.getvalue())

                new_patch.seek(0)

                file_path = pathjoin(temp_dir, 'file')

                orig_file = file(file_path, 'wb')

                for line in old_lines:

                    orig_file.write(line)

                orig_file.close()

                patch(file_path, new_patch)

                new_file = file(file_path, 'rb')

                assert list(new_file) == new_lines

            last_id = revision_id

    print old_total, new_total

finally:

    repo.unlock()