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  • Committer: Canonical.com Patch Queue Manager
  • Date: 2008-10-02 17:28:44 UTC
  • mfrom: (3744.2.2 merge_reprocess)
  • Revision ID: pqm@pqm.ubuntu.com-20081002172844-d6df1l8dzpsqzyup
(jam) For 'bzr merge' enable '--reprocess' by default whenever
        '--show-base' is not set.

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bzrlib/diff.py
1
 
# Copyright (C) 2005-2011 Canonical Ltd.
 
1
# Copyright (C) 2004, 2005, 2006 Canonical Ltd.
2
2
#
3
3
# This program is free software; you can redistribute it and/or modify
4
4
# it under the terms of the GNU General Public License as published by
12
12
#
13
13
# You should have received a copy of the GNU General Public License
14
14
# along with this program; if not, write to the Free Software
15
 
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
16
16
 
17
17
import difflib
18
18
import os
19
19
import re
20
 
import string
 
20
import shutil
21
21
import sys
22
22
 
23
23
from bzrlib.lazy_import import lazy_import
25
25
import errno
26
26
import subprocess
27
27
import tempfile
 
28
import time
28
29
 
29
30
from bzrlib import (
 
31
    branch as _mod_branch,
30
32
    bzrdir,
31
 
    cmdline,
32
 
    cleanup,
 
33
    commands,
33
34
    errors,
34
35
    osutils,
35
36
    patiencediff,
36
37
    textfile,
37
38
    timestamp,
38
 
    views,
39
39
    )
40
 
 
41
 
from bzrlib.workingtree import WorkingTree
42
40
""")
43
41
 
44
 
from bzrlib.registry import (
45
 
    Registry,
46
 
    )
47
 
from bzrlib.trace import mutter, note, warning
48
 
 
49
 
 
50
 
class AtTemplate(string.Template):
51
 
    """Templating class that uses @ instead of $."""
52
 
 
53
 
    delimiter = '@'
 
42
from bzrlib.symbol_versioning import (
 
43
        deprecated_function,
 
44
        one_three
 
45
        )
 
46
from bzrlib.trace import warning
54
47
 
55
48
 
56
49
# TODO: Rather than building a changeset object, we should probably
85
78
    # both sequences are empty.
86
79
    if not oldlines and not newlines:
87
80
        return
88
 
 
 
81
    
89
82
    if allow_binary is False:
90
83
        textfile.check_text_lines(oldlines)
91
84
        textfile.check_text_lines(newlines)
93
86
    if sequence_matcher is None:
94
87
        sequence_matcher = patiencediff.PatienceSequenceMatcher
95
88
    ud = patiencediff.unified_diff(oldlines, newlines,
96
 
                      fromfile=old_filename.encode(path_encoding, 'replace'),
97
 
                      tofile=new_filename.encode(path_encoding, 'replace'),
 
89
                      fromfile=old_filename.encode(path_encoding),
 
90
                      tofile=new_filename.encode(path_encoding),
98
91
                      sequencematcher=sequence_matcher)
99
92
 
100
93
    ud = list(ud)
106
99
        ud[2] = ud[2].replace('-1,0', '-0,0')
107
100
    elif not newlines:
108
101
        ud[2] = ud[2].replace('+1,0', '+0,0')
 
102
    # work around for difflib emitting random spaces after the label
 
103
    ud[0] = ud[0][:-2] + '\n'
 
104
    ud[1] = ud[1][:-2] + '\n'
109
105
 
110
106
    for line in ud:
111
107
        to_file.write(line)
178
174
 
179
175
        if not diff_opts:
180
176
            diff_opts = []
181
 
        if sys.platform == 'win32':
182
 
            # Popen doesn't do the proper encoding for external commands
183
 
            # Since we are dealing with an ANSI api, use mbcs encoding
184
 
            old_filename = old_filename.encode('mbcs')
185
 
            new_filename = new_filename.encode('mbcs')
186
177
        diffcmd = ['diff',
187
178
                   '--label', old_filename,
188
179
                   old_abspath,
211
202
            break
212
203
        else:
213
204
            diffcmd.append('-u')
214
 
 
 
205
                  
215
206
        if diff_opts:
216
207
            diffcmd.extend(diff_opts)
217
208
 
218
209
        pipe = _spawn_external_diff(diffcmd, capture_errors=True)
219
210
        out,err = pipe.communicate()
220
211
        rc = pipe.returncode
221
 
 
 
212
        
222
213
        # internal_diff() adds a trailing newline, add one here for consistency
223
214
        out += '\n'
224
215
        if rc == 2:
259
250
                msg = 'signal %d' % (-rc)
260
251
            else:
261
252
                msg = 'exit code %d' % rc
262
 
 
263
 
            raise errors.BzrError('external diff failed with %s; command: %r'
 
253
                
 
254
            raise errors.BzrError('external diff failed with %s; command: %r' 
264
255
                                  % (rc, diffcmd))
265
256
 
266
257
 
284
275
                        new_abspath, e)
285
276
 
286
277
 
287
 
def get_trees_and_branches_to_diff_locked(
288
 
    path_list, revision_specs, old_url, new_url, add_cleanup, apply_view=True):
 
278
def _get_trees_to_diff(path_list, revision_specs, old_url, new_url):
289
279
    """Get the trees and specific files to diff given a list of paths.
290
280
 
291
281
    This method works out the trees to be diff'ed and the files of
302
292
    :param new_url:
303
293
        The url of the new branch or tree. If None, the tree to use is
304
294
        taken from the first path, if any, or the current working tree.
305
 
    :param add_cleanup:
306
 
        a callable like Command.add_cleanup.  get_trees_and_branches_to_diff
307
 
        will register cleanups that must be run to unlock the trees, etc.
308
 
    :param apply_view:
309
 
        if True and a view is set, apply the view or check that the paths
310
 
        are within it
311
295
    :returns:
312
 
        a tuple of (old_tree, new_tree, old_branch, new_branch,
313
 
        specific_files, extra_trees) where extra_trees is a sequence of
314
 
        additional trees to search in for file-ids.  The trees and branches
315
 
        will be read-locked until the cleanups registered via the add_cleanup
316
 
        param are run.
 
296
        a tuple of (old_tree, new_tree, specific_files, extra_trees) where
 
297
        extra_trees is a sequence of additional trees to search in for
 
298
        file-ids.
317
299
    """
318
300
    # Get the old and new revision specs
319
301
    old_revision_spec = None
342
324
        default_location = path_list[0]
343
325
        other_paths = path_list[1:]
344
326
 
345
 
    def lock_tree_or_branch(wt, br):
346
 
        if wt is not None:
347
 
            wt.lock_read()
348
 
            add_cleanup(wt.unlock)
349
 
        elif br is not None:
350
 
            br.lock_read()
351
 
            add_cleanup(br.unlock)
352
 
 
353
327
    # Get the old location
354
328
    specific_files = []
355
329
    if old_url is None:
356
330
        old_url = default_location
357
331
    working_tree, branch, relpath = \
358
332
        bzrdir.BzrDir.open_containing_tree_or_branch(old_url)
359
 
    lock_tree_or_branch(working_tree, branch)
360
333
    if consider_relpath and relpath != '':
361
 
        if working_tree is not None and apply_view:
362
 
            views.check_path_in_view(working_tree, relpath)
363
334
        specific_files.append(relpath)
364
335
    old_tree = _get_tree_to_diff(old_revision_spec, working_tree, branch)
365
 
    old_branch = branch
366
336
 
367
337
    # Get the new location
368
338
    if new_url is None:
370
340
    if new_url != old_url:
371
341
        working_tree, branch, relpath = \
372
342
            bzrdir.BzrDir.open_containing_tree_or_branch(new_url)
373
 
        lock_tree_or_branch(working_tree, branch)
374
343
        if consider_relpath and relpath != '':
375
 
            if working_tree is not None and apply_view:
376
 
                views.check_path_in_view(working_tree, relpath)
377
344
            specific_files.append(relpath)
378
345
    new_tree = _get_tree_to_diff(new_revision_spec, working_tree, branch,
379
346
        basis_is_default=working_tree is None)
380
 
    new_branch = branch
381
347
 
382
348
    # Get the specific files (all files is None, no files is [])
383
349
    if make_paths_wt_relative and working_tree is not None:
384
 
        other_paths = working_tree.safe_relpath_files(
385
 
            other_paths,
386
 
            apply_view=apply_view)
 
350
        other_paths = _relative_paths_in_tree(working_tree, other_paths)
387
351
    specific_files.extend(other_paths)
388
352
    if len(specific_files) == 0:
389
353
        specific_files = None
390
 
        if (working_tree is not None and working_tree.supports_views()
391
 
            and apply_view):
392
 
            view_files = working_tree.views.lookup_view()
393
 
            if view_files:
394
 
                specific_files = view_files
395
 
                view_str = views.view_display_str(view_files)
396
 
                note("*** Ignoring files outside view. View is %s" % view_str)
397
354
 
398
355
    # Get extra trees that ought to be searched for file-ids
399
356
    extra_trees = None
400
357
    if working_tree is not None and working_tree not in (old_tree, new_tree):
401
358
        extra_trees = (working_tree,)
402
 
    return (old_tree, new_tree, old_branch, new_branch,
403
 
            specific_files, extra_trees)
 
359
    return old_tree, new_tree, specific_files, extra_trees
404
360
 
405
361
 
406
362
def _get_tree_to_diff(spec, tree=None, branch=None, basis_is_default=True):
417
373
    return spec.as_tree(branch)
418
374
 
419
375
 
 
376
def _relative_paths_in_tree(tree, paths):
 
377
    """Get the relative paths within a working tree.
 
378
 
 
379
    Each path may be either an absolute path or a path relative to the
 
380
    current working directory.
 
381
    """
 
382
    result = []
 
383
    for filename in paths:
 
384
        try:
 
385
            result.append(tree.relpath(osutils.dereference_path(filename)))
 
386
        except errors.PathNotChild:
 
387
            raise errors.BzrCommandError("Files are in different branches")
 
388
    return result
 
389
 
 
390
 
420
391
def show_diff_trees(old_tree, new_tree, to_file, specific_files=None,
421
392
                    external_diff_options=None,
422
393
                    old_label='a/', new_label='b/',
423
394
                    extra_trees=None,
424
395
                    path_encoding='utf8',
425
 
                    using=None,
426
 
                    format_cls=None):
 
396
                    using=None):
427
397
    """Show in text form the changes from one tree to another.
428
398
 
429
 
    :param to_file: The output stream.
430
 
    :param specific_files: Include only changes to these files - None for all
431
 
        changes.
432
 
    :param external_diff_options: If set, use an external GNU diff and pass 
433
 
        these options.
434
 
    :param extra_trees: If set, more Trees to use for looking up file ids
435
 
    :param path_encoding: If set, the path will be encoded as specified, 
436
 
        otherwise is supposed to be utf8
437
 
    :param format_cls: Formatter class (DiffTree subclass)
 
399
    to_file
 
400
        The output stream.
 
401
 
 
402
    specific_files
 
403
        Include only changes to these files - None for all changes.
 
404
 
 
405
    external_diff_options
 
406
        If set, use an external GNU diff and pass these options.
 
407
 
 
408
    extra_trees
 
409
        If set, more Trees to use for looking up file ids
 
410
 
 
411
    path_encoding
 
412
        If set, the path will be encoded as specified, otherwise is supposed
 
413
        to be utf8
438
414
    """
439
 
    if format_cls is None:
440
 
        format_cls = DiffTree
441
415
    old_tree.lock_read()
442
416
    try:
443
417
        if extra_trees is not None:
445
419
                tree.lock_read()
446
420
        new_tree.lock_read()
447
421
        try:
448
 
            differ = format_cls.from_trees_options(old_tree, new_tree, to_file,
449
 
                                                   path_encoding,
450
 
                                                   external_diff_options,
451
 
                                                   old_label, new_label, using)
 
422
            differ = DiffTree.from_trees_options(old_tree, new_tree, to_file,
 
423
                                                 path_encoding,
 
424
                                                 external_diff_options,
 
425
                                                 old_label, new_label, using)
452
426
            return differ.show_diff(specific_files, extra_trees)
453
427
        finally:
454
428
            new_tree.unlock()
461
435
 
462
436
def _patch_header_date(tree, file_id, path):
463
437
    """Returns a timestamp suitable for use in a patch header."""
464
 
    try:
465
 
        mtime = tree.get_file_mtime(file_id, path)
466
 
    except errors.FileTimestampUnavailable:
467
 
        mtime = 0
 
438
    mtime = tree.get_file_mtime(file_id, path)
468
439
    return timestamp.format_patch_date(mtime)
469
440
 
470
441
 
 
442
@deprecated_function(one_three)
 
443
def get_prop_change(meta_modified):
 
444
    if meta_modified:
 
445
        return " (properties changed)"
 
446
    else:
 
447
        return  ""
 
448
 
471
449
def get_executable_change(old_is_x, new_is_x):
472
450
    descr = { True:"+x", False:"-x", None:"??" }
473
451
    if old_is_x != new_is_x:
648
626
            return self.CANNOT_DIFF
649
627
        from_label = '%s%s\t%s' % (self.old_label, old_path, old_date)
650
628
        to_label = '%s%s\t%s' % (self.new_label, new_path, new_date)
651
 
        return self.diff_text(from_file_id, to_file_id, from_label, to_label,
652
 
            old_path, new_path)
 
629
        return self.diff_text(from_file_id, to_file_id, from_label, to_label)
653
630
 
654
 
    def diff_text(self, from_file_id, to_file_id, from_label, to_label,
655
 
        from_path=None, to_path=None):
 
631
    def diff_text(self, from_file_id, to_file_id, from_label, to_label):
656
632
        """Diff the content of given files in two trees
657
633
 
658
634
        :param from_file_id: The id of the file in the from tree.  If None,
660
636
        :param to_file_id: The id of the file in the to tree.  This may refer
661
637
            to a different file from from_file_id.  If None,
662
638
            the file is not present in the to tree.
663
 
        :param from_path: The path in the from tree or None if unknown.
664
 
        :param to_path: The path in the to tree or None if unknown.
665
639
        """
666
 
        def _get_text(tree, file_id, path):
 
640
        def _get_text(tree, file_id):
667
641
            if file_id is not None:
668
 
                return tree.get_file_lines(file_id, path)
 
642
                return tree.get_file(file_id).readlines()
669
643
            else:
670
644
                return []
671
645
        try:
672
 
            from_text = _get_text(self.old_tree, from_file_id, from_path)
673
 
            to_text = _get_text(self.new_tree, to_file_id, to_path)
 
646
            from_text = _get_text(self.old_tree, from_file_id)
 
647
            to_text = _get_text(self.new_tree, to_file_id)
674
648
            self.text_differ(from_label, from_text, to_label, to_text,
675
 
                             self.to_file, path_encoding=self.path_encoding)
 
649
                             self.to_file)
676
650
        except errors.BinaryFile:
677
651
            self.to_file.write(
678
652
                  ("Binary files %s and %s differ\n" %
679
 
                  (from_label, to_label)).encode(self.path_encoding,'replace'))
 
653
                  (from_label, to_label)).encode(self.path_encoding))
680
654
        return self.CHANGED
681
655
 
682
656
 
691
665
    @classmethod
692
666
    def from_string(klass, command_string, old_tree, new_tree, to_file,
693
667
                    path_encoding='utf-8'):
694
 
        command_template = cmdline.split(command_string)
695
 
        if '@' not in command_string:
696
 
            command_template.extend(['@old_path', '@new_path'])
 
668
        command_template = commands.shlex_split_unicode(command_string)
 
669
        command_template.extend(['%(old_path)s', '%(new_path)s'])
697
670
        return klass(command_template, old_tree, new_tree, to_file,
698
671
                     path_encoding)
699
672
 
700
673
    @classmethod
701
 
    def make_from_diff_tree(klass, command_string, external_diff_options=None):
 
674
    def make_from_diff_tree(klass, command_string):
702
675
        def from_diff_tree(diff_tree):
703
 
            full_command_string = [command_string]
704
 
            if external_diff_options is not None:
705
 
                full_command_string += ' ' + external_diff_options
706
 
            return klass.from_string(full_command_string, diff_tree.old_tree,
 
676
            return klass.from_string(command_string, diff_tree.old_tree,
707
677
                                     diff_tree.new_tree, diff_tree.to_file)
708
678
        return from_diff_tree
709
679
 
710
680
    def _get_command(self, old_path, new_path):
711
681
        my_map = {'old_path': old_path, 'new_path': new_path}
712
 
        command = [AtTemplate(t).substitute(my_map) for t in
713
 
                   self.command_template]
714
 
        if sys.platform == 'win32': # Popen doesn't accept unicode on win32
715
 
            command_encoded = []
716
 
            for c in command:
717
 
                if isinstance(c, unicode):
718
 
                    command_encoded.append(c.encode('mbcs'))
719
 
                else:
720
 
                    command_encoded.append(c)
721
 
            return command_encoded
722
 
        else:
723
 
            return command
 
682
        return [t % my_map for t in self.command_template]
724
683
 
725
684
    def _execute(self, old_path, new_path):
726
685
        command = self._get_command(old_path, new_path)
746
705
                raise
747
706
        return True
748
707
 
749
 
    @staticmethod
750
 
    def _fenc():
751
 
        """Returns safe encoding for passing file path to diff tool"""
752
 
        if sys.platform == 'win32':
753
 
            return 'mbcs'
754
 
        else:
755
 
            # Don't fallback to 'utf-8' because subprocess may not be able to
756
 
            # handle utf-8 correctly when locale is not utf-8.
757
 
            return sys.getfilesystemencoding() or 'ascii'
758
 
 
759
 
    def _is_safepath(self, path):
760
 
        """Return true if `path` may be able to pass to subprocess."""
761
 
        fenc = self._fenc()
762
 
        try:
763
 
            return path == path.encode(fenc).decode(fenc)
764
 
        except UnicodeError:
765
 
            return False
766
 
 
767
 
    def _safe_filename(self, prefix, relpath):
768
 
        """Replace unsafe character in `relpath` then join `self._root`,
769
 
        `prefix` and `relpath`."""
770
 
        fenc = self._fenc()
771
 
        # encoded_str.replace('?', '_') may break multibyte char.
772
 
        # So we should encode, decode, then replace(u'?', u'_')
773
 
        relpath_tmp = relpath.encode(fenc, 'replace').decode(fenc, 'replace')
774
 
        relpath_tmp = relpath_tmp.replace(u'?', u'_')
775
 
        return osutils.pathjoin(self._root, prefix, relpath_tmp)
776
 
 
777
 
    def _write_file(self, file_id, tree, prefix, relpath, force_temp=False,
778
 
                    allow_write=False):
779
 
        if not force_temp and isinstance(tree, WorkingTree):
780
 
            full_path = tree.abspath(tree.id2path(file_id))
781
 
            if self._is_safepath(full_path):
782
 
                return full_path
783
 
 
784
 
        full_path = self._safe_filename(prefix, relpath)
785
 
        if not force_temp and self._try_symlink_root(tree, prefix):
 
708
    def _write_file(self, file_id, tree, prefix, relpath):
 
709
        full_path = osutils.pathjoin(self._root, prefix, relpath)
 
710
        if self._try_symlink_root(tree, prefix):
786
711
            return full_path
787
712
        parent_dir = osutils.dirname(full_path)
788
713
        try:
799
724
                target.close()
800
725
        finally:
801
726
            source.close()
802
 
        try:
803
 
            mtime = tree.get_file_mtime(file_id)
804
 
        except errors.FileTimestampUnavailable:
805
 
            pass
806
 
        else:
807
 
            os.utime(full_path, (mtime, mtime))
808
 
        if not allow_write:
809
 
            osutils.make_readonly(full_path)
 
727
        osutils.make_readonly(full_path)
 
728
        mtime = tree.get_file_mtime(file_id)
 
729
        os.utime(full_path, (mtime, mtime))
810
730
        return full_path
811
731
 
812
 
    def _prepare_files(self, file_id, old_path, new_path, force_temp=False,
813
 
                       allow_write_new=False):
 
732
    def _prepare_files(self, file_id, old_path, new_path):
814
733
        old_disk_path = self._write_file(file_id, self.old_tree, 'old',
815
 
                                         old_path, force_temp)
 
734
                                         old_path)
816
735
        new_disk_path = self._write_file(file_id, self.new_tree, 'new',
817
 
                                         new_path, force_temp,
818
 
                                         allow_write=allow_write_new)
 
736
                                         new_path)
819
737
        return old_disk_path, new_disk_path
820
738
 
821
739
    def finish(self):
822
 
        try:
823
 
            osutils.rmtree(self._root)
824
 
        except OSError, e:
825
 
            if e.errno != errno.ENOENT:
826
 
                mutter("The temporary directory \"%s\" was not "
827
 
                        "cleanly removed: %s." % (self._root, e))
 
740
        osutils.rmtree(self._root)
828
741
 
829
742
    def diff(self, file_id, old_path, new_path, old_kind, new_kind):
830
743
        if (old_kind, new_kind) != ('file', 'file'):
831
744
            return DiffPath.CANNOT_DIFF
832
 
        (old_disk_path, new_disk_path) = self._prepare_files(
833
 
                                                file_id, old_path, new_path)
834
 
        self._execute(old_disk_path, new_disk_path)
835
 
 
836
 
    def edit_file(self, file_id):
837
 
        """Use this tool to edit a file.
838
 
 
839
 
        A temporary copy will be edited, and the new contents will be
840
 
        returned.
841
 
 
842
 
        :param file_id: The id of the file to edit.
843
 
        :return: The new contents of the file.
844
 
        """
845
 
        old_path = self.old_tree.id2path(file_id)
846
 
        new_path = self.new_tree.id2path(file_id)
847
 
        old_abs_path, new_abs_path = self._prepare_files(
848
 
                                            file_id, old_path, new_path,
849
 
                                            allow_write_new=True,
850
 
                                            force_temp=True)
851
 
        command = self._get_command(old_abs_path, new_abs_path)
852
 
        subprocess.call(command, cwd=self._root)
853
 
        new_file = open(new_abs_path, 'rb')
854
 
        try:
855
 
            return new_file.read()
856
 
        finally:
857
 
            new_file.close()
 
745
        self._prepare_files(file_id, old_path, new_path)
 
746
        self._execute(osutils.pathjoin('old', old_path),
 
747
                      osutils.pathjoin('new', new_path))
858
748
 
859
749
 
860
750
class DiffTree(object):
906
796
        """Factory for producing a DiffTree.
907
797
 
908
798
        Designed to accept options used by show_diff_trees.
909
 
 
910
799
        :param old_tree: The tree to show as old in the comparison
911
800
        :param new_tree: The tree to show as new in the comparison
912
801
        :param to_file: File to write comparisons to
918
807
        :param using: Commandline to use to invoke an external diff tool
919
808
        """
920
809
        if using is not None:
921
 
            extra_factories = [DiffFromTool.make_from_diff_tree(using, external_diff_options)]
 
810
            extra_factories = [DiffFromTool.make_from_diff_tree(using)]
922
811
        else:
923
812
            extra_factories = []
924
813
        if external_diff_options:
925
814
            opts = external_diff_options.split()
926
 
            def diff_file(olab, olines, nlab, nlines, to_file, path_encoding=None):
927
 
                """:param path_encoding: not used but required
928
 
                        to match the signature of internal_diff.
929
 
                """
 
815
            def diff_file(olab, olines, nlab, nlines, to_file):
930
816
                external_diff(olab, olines, nlab, nlines, to_file, opts)
931
817
        else:
932
818
            diff_file = internal_diff
938
824
    def show_diff(self, specific_files, extra_trees=None):
939
825
        """Write tree diff to self.to_file
940
826
 
941
 
        :param specific_files: the specific files to compare (recursive)
 
827
        :param sepecific_files: the specific files to compare (recursive)
942
828
        :param extra_trees: extra trees to use for mapping paths to file_ids
943
829
        """
944
830
        try:
1002
888
                self.to_file.write("=== modified %s '%s'%s\n" % (kind[0],
1003
889
                                   newpath_encoded, prop_str))
1004
890
            if changed_content:
1005
 
                self._diff(file_id, oldpath, newpath, kind[0], kind[1])
 
891
                self.diff(file_id, oldpath, newpath)
1006
892
                has_changes = 1
1007
893
            if renamed:
1008
894
                has_changes = 1
1023
909
            new_kind = self.new_tree.kind(file_id)
1024
910
        except (errors.NoSuchId, errors.NoSuchFile):
1025
911
            new_kind = None
1026
 
        self._diff(file_id, old_path, new_path, old_kind, new_kind)
1027
 
 
1028
 
 
1029
 
    def _diff(self, file_id, old_path, new_path, old_kind, new_kind):
 
912
 
1030
913
        result = DiffPath._diff_many(self.differs, file_id, old_path,
1031
914
                                       new_path, old_kind, new_kind)
1032
915
        if result is DiffPath.CANNOT_DIFF:
1034
917
            if error_path is None:
1035
918
                error_path = old_path
1036
919
            raise errors.NoDiffFound(error_path)
1037
 
 
1038
 
 
1039
 
format_registry = Registry()
1040
 
format_registry.register('default', DiffTree)