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  • Committer: Johan Walles
  • Date: 2009-05-07 05:08:46 UTC
  • mfrom: (4342 +trunk)
  • mto: This revision was merged to the branch mainline in revision 4343.
  • Revision ID: johan.walles@gmail.com-20090507050846-nkwvcyauf1eh653q
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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
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,
37
38
    timestamp,
38
39
    views,
39
40
    )
40
 
 
41
 
from bzrlib.workingtree import WorkingTree
42
41
""")
43
42
 
44
 
from bzrlib.registry import (
45
 
    Registry,
46
 
    )
47
43
from bzrlib.symbol_versioning import (
48
44
    deprecated_function,
49
 
    deprecated_in,
50
45
    )
51
46
from bzrlib.trace import mutter, note, warning
52
47
 
53
48
 
54
 
class AtTemplate(string.Template):
55
 
    """Templating class that uses @ instead of $."""
56
 
 
57
 
    delimiter = '@'
58
 
 
59
 
 
60
49
# TODO: Rather than building a changeset object, we should probably
61
50
# invoke callbacks on an object.  That object can either accumulate a
62
51
# list, write them out directly, etc etc.
97
86
    if sequence_matcher is None:
98
87
        sequence_matcher = patiencediff.PatienceSequenceMatcher
99
88
    ud = patiencediff.unified_diff(oldlines, newlines,
100
 
                      fromfile=old_filename.encode(path_encoding, 'replace'),
101
 
                      tofile=new_filename.encode(path_encoding, 'replace'),
 
89
                      fromfile=old_filename.encode(path_encoding),
 
90
                      tofile=new_filename.encode(path_encoding),
102
91
                      sequencematcher=sequence_matcher)
103
92
 
104
93
    ud = list(ud)
182
171
 
183
172
        if not diff_opts:
184
173
            diff_opts = []
185
 
        if sys.platform == 'win32':
186
 
            # Popen doesn't do the proper encoding for external commands
187
 
            # Since we are dealing with an ANSI api, use mbcs encoding
188
 
            old_filename = old_filename.encode('mbcs')
189
 
            new_filename = new_filename.encode('mbcs')
190
174
        diffcmd = ['diff',
191
175
                   '--label', old_filename,
192
176
                   old_abspath,
288
272
                        new_abspath, e)
289
273
 
290
274
 
291
 
@deprecated_function(deprecated_in((2, 2, 0)))
292
 
def get_trees_and_branches_to_diff(path_list, revision_specs, old_url, new_url,
293
 
                                   apply_view=True):
294
 
    """Get the trees and specific files to diff given a list of paths.
295
 
 
296
 
    This method works out the trees to be diff'ed and the files of
297
 
    interest within those trees.
298
 
 
299
 
    :param path_list:
300
 
        the list of arguments passed to the diff command
301
 
    :param revision_specs:
302
 
        Zero, one or two RevisionSpecs from the diff command line,
303
 
        saying what revisions to compare.
304
 
    :param old_url:
305
 
        The url of the old branch or tree. If None, the tree to use is
306
 
        taken from the first path, if any, or the current working tree.
307
 
    :param new_url:
308
 
        The url of the new branch or tree. If None, the tree to use is
309
 
        taken from the first path, if any, or the current working tree.
310
 
    :param apply_view:
311
 
        if True and a view is set, apply the view or check that the paths
312
 
        are within it
313
 
    :returns:
314
 
        a tuple of (old_tree, new_tree, old_branch, new_branch,
315
 
        specific_files, extra_trees) where extra_trees is a sequence of
316
 
        additional trees to search in for file-ids.  The trees and branches
317
 
        are not locked.
318
 
    """
319
 
    op = cleanup.OperationWithCleanups(get_trees_and_branches_to_diff_locked)
320
 
    return op.run_simple(path_list, revision_specs, old_url, new_url,
321
 
            op.add_cleanup, apply_view=apply_view)
322
 
    
323
 
 
324
 
def get_trees_and_branches_to_diff_locked(
325
 
    path_list, revision_specs, old_url, new_url, add_cleanup, apply_view=True):
326
 
    """Get the trees and specific files to diff given a list of paths.
327
 
 
328
 
    This method works out the trees to be diff'ed and the files of
329
 
    interest within those trees.
330
 
 
331
 
    :param path_list:
332
 
        the list of arguments passed to the diff command
333
 
    :param revision_specs:
334
 
        Zero, one or two RevisionSpecs from the diff command line,
335
 
        saying what revisions to compare.
336
 
    :param old_url:
337
 
        The url of the old branch or tree. If None, the tree to use is
338
 
        taken from the first path, if any, or the current working tree.
339
 
    :param new_url:
340
 
        The url of the new branch or tree. If None, the tree to use is
341
 
        taken from the first path, if any, or the current working tree.
342
 
    :param add_cleanup:
343
 
        a callable like Command.add_cleanup.  get_trees_and_branches_to_diff
344
 
        will register cleanups that must be run to unlock the trees, etc.
345
 
    :param apply_view:
346
 
        if True and a view is set, apply the view or check that the paths
347
 
        are within it
348
 
    :returns:
349
 
        a tuple of (old_tree, new_tree, old_branch, new_branch,
350
 
        specific_files, extra_trees) where extra_trees is a sequence of
351
 
        additional trees to search in for file-ids.  The trees and branches
352
 
        will be read-locked until the cleanups registered via the add_cleanup
353
 
        param are run.
 
275
def _get_trees_to_diff(path_list, revision_specs, old_url, new_url,
 
276
    apply_view=True):
 
277
    """Get the trees and specific files to diff given a list of paths.
 
278
 
 
279
    This method works out the trees to be diff'ed and the files of
 
280
    interest within those trees.
 
281
 
 
282
    :param path_list:
 
283
        the list of arguments passed to the diff command
 
284
    :param revision_specs:
 
285
        Zero, one or two RevisionSpecs from the diff command line,
 
286
        saying what revisions to compare.
 
287
    :param old_url:
 
288
        The url of the old branch or tree. If None, the tree to use is
 
289
        taken from the first path, if any, or the current working tree.
 
290
    :param new_url:
 
291
        The url of the new branch or tree. If None, the tree to use is
 
292
        taken from the first path, if any, or the current working tree.
 
293
    :param apply_view:
 
294
        if True and a view is set, apply the view or check that the paths
 
295
        are within it
 
296
    :returns:
 
297
        a tuple of (old_tree, new_tree, specific_files, extra_trees) where
 
298
        extra_trees is a sequence of additional trees to search in for
 
299
        file-ids.
354
300
    """
355
301
    # Get the old and new revision specs
356
302
    old_revision_spec = None
379
325
        default_location = path_list[0]
380
326
        other_paths = path_list[1:]
381
327
 
382
 
    def lock_tree_or_branch(wt, br):
383
 
        if wt is not None:
384
 
            wt.lock_read()
385
 
            add_cleanup(wt.unlock)
386
 
        elif br is not None:
387
 
            br.lock_read()
388
 
            add_cleanup(br.unlock)
389
 
 
390
328
    # Get the old location
391
329
    specific_files = []
392
330
    if old_url is None:
393
331
        old_url = default_location
394
332
    working_tree, branch, relpath = \
395
333
        bzrdir.BzrDir.open_containing_tree_or_branch(old_url)
396
 
    lock_tree_or_branch(working_tree, branch)
397
334
    if consider_relpath and relpath != '':
398
335
        if working_tree is not None and apply_view:
399
336
            views.check_path_in_view(working_tree, relpath)
400
337
        specific_files.append(relpath)
401
338
    old_tree = _get_tree_to_diff(old_revision_spec, working_tree, branch)
402
 
    old_branch = branch
403
339
 
404
340
    # Get the new location
405
341
    if new_url is None:
407
343
    if new_url != old_url:
408
344
        working_tree, branch, relpath = \
409
345
            bzrdir.BzrDir.open_containing_tree_or_branch(new_url)
410
 
        lock_tree_or_branch(working_tree, branch)
411
346
        if consider_relpath and relpath != '':
412
347
            if working_tree is not None and apply_view:
413
348
                views.check_path_in_view(working_tree, relpath)
414
349
            specific_files.append(relpath)
415
350
    new_tree = _get_tree_to_diff(new_revision_spec, working_tree, branch,
416
351
        basis_is_default=working_tree is None)
417
 
    new_branch = branch
418
352
 
419
353
    # Get the specific files (all files is None, no files is [])
420
354
    if make_paths_wt_relative and working_tree is not None:
421
 
        other_paths = working_tree.safe_relpath_files(
422
 
            other_paths,
 
355
        try:
 
356
            from bzrlib.builtins import safe_relpath_files
 
357
            other_paths = safe_relpath_files(working_tree, other_paths,
423
358
            apply_view=apply_view)
 
359
        except errors.FileInWrongBranch:
 
360
            raise errors.BzrCommandError("Files are in different branches")
424
361
    specific_files.extend(other_paths)
425
362
    if len(specific_files) == 0:
426
363
        specific_files = None
436
373
    extra_trees = None
437
374
    if working_tree is not None and working_tree not in (old_tree, new_tree):
438
375
        extra_trees = (working_tree,)
439
 
    return old_tree, new_tree, old_branch, new_branch, specific_files, extra_trees
440
 
 
 
376
    return old_tree, new_tree, specific_files, extra_trees
441
377
 
442
378
def _get_tree_to_diff(spec, tree=None, branch=None, basis_is_default=True):
443
379
    if branch is None and tree is not None:
458
394
                    old_label='a/', new_label='b/',
459
395
                    extra_trees=None,
460
396
                    path_encoding='utf8',
461
 
                    using=None,
462
 
                    format_cls=None):
 
397
                    using=None):
463
398
    """Show in text form the changes from one tree to another.
464
399
 
465
 
    :param to_file: The output stream.
466
 
    :param specific_files: Include only changes to these files - None for all
467
 
        changes.
468
 
    :param external_diff_options: If set, use an external GNU diff and pass 
469
 
        these options.
470
 
    :param extra_trees: If set, more Trees to use for looking up file ids
471
 
    :param path_encoding: If set, the path will be encoded as specified, 
472
 
        otherwise is supposed to be utf8
473
 
    :param format_cls: Formatter class (DiffTree subclass)
 
400
    to_file
 
401
        The output stream.
 
402
 
 
403
    specific_files
 
404
        Include only changes to these files - None for all changes.
 
405
 
 
406
    external_diff_options
 
407
        If set, use an external GNU diff and pass these options.
 
408
 
 
409
    extra_trees
 
410
        If set, more Trees to use for looking up file ids
 
411
 
 
412
    path_encoding
 
413
        If set, the path will be encoded as specified, otherwise is supposed
 
414
        to be utf8
474
415
    """
475
 
    if format_cls is None:
476
 
        format_cls = DiffTree
477
416
    old_tree.lock_read()
478
417
    try:
479
418
        if extra_trees is not None:
481
420
                tree.lock_read()
482
421
        new_tree.lock_read()
483
422
        try:
484
 
            differ = format_cls.from_trees_options(old_tree, new_tree, to_file,
485
 
                                                   path_encoding,
486
 
                                                   external_diff_options,
487
 
                                                   old_label, new_label, using)
 
423
            differ = DiffTree.from_trees_options(old_tree, new_tree, to_file,
 
424
                                                 path_encoding,
 
425
                                                 external_diff_options,
 
426
                                                 old_label, new_label, using)
488
427
            return differ.show_diff(specific_files, extra_trees)
489
428
        finally:
490
429
            new_tree.unlock()
497
436
 
498
437
def _patch_header_date(tree, file_id, path):
499
438
    """Returns a timestamp suitable for use in a patch header."""
500
 
    try:
501
 
        mtime = tree.get_file_mtime(file_id, path)
502
 
    except errors.FileTimestampUnavailable:
503
 
        mtime = 0
 
439
    mtime = tree.get_file_mtime(file_id, path)
504
440
    return timestamp.format_patch_date(mtime)
505
441
 
506
442
 
684
620
            return self.CANNOT_DIFF
685
621
        from_label = '%s%s\t%s' % (self.old_label, old_path, old_date)
686
622
        to_label = '%s%s\t%s' % (self.new_label, new_path, new_date)
687
 
        return self.diff_text(from_file_id, to_file_id, from_label, to_label,
688
 
            old_path, new_path)
 
623
        return self.diff_text(from_file_id, to_file_id, from_label, to_label)
689
624
 
690
 
    def diff_text(self, from_file_id, to_file_id, from_label, to_label,
691
 
        from_path=None, to_path=None):
 
625
    def diff_text(self, from_file_id, to_file_id, from_label, to_label):
692
626
        """Diff the content of given files in two trees
693
627
 
694
628
        :param from_file_id: The id of the file in the from tree.  If None,
696
630
        :param to_file_id: The id of the file in the to tree.  This may refer
697
631
            to a different file from from_file_id.  If None,
698
632
            the file is not present in the to tree.
699
 
        :param from_path: The path in the from tree or None if unknown.
700
 
        :param to_path: The path in the to tree or None if unknown.
701
633
        """
702
 
        def _get_text(tree, file_id, path):
 
634
        def _get_text(tree, file_id):
703
635
            if file_id is not None:
704
 
                return tree.get_file_lines(file_id, path)
 
636
                return tree.get_file(file_id).readlines()
705
637
            else:
706
638
                return []
707
639
        try:
708
 
            from_text = _get_text(self.old_tree, from_file_id, from_path)
709
 
            to_text = _get_text(self.new_tree, to_file_id, to_path)
 
640
            from_text = _get_text(self.old_tree, from_file_id)
 
641
            to_text = _get_text(self.new_tree, to_file_id)
710
642
            self.text_differ(from_label, from_text, to_label, to_text,
711
 
                             self.to_file, path_encoding=self.path_encoding)
 
643
                             self.to_file)
712
644
        except errors.BinaryFile:
713
645
            self.to_file.write(
714
646
                  ("Binary files %s and %s differ\n" %
715
 
                  (from_label, to_label)).encode(self.path_encoding,'replace'))
 
647
                  (from_label, to_label)).encode(self.path_encoding))
716
648
        return self.CHANGED
717
649
 
718
650
 
727
659
    @classmethod
728
660
    def from_string(klass, command_string, old_tree, new_tree, to_file,
729
661
                    path_encoding='utf-8'):
730
 
        command_template = cmdline.split(command_string)
731
 
        if '@' not in command_string:
732
 
            command_template.extend(['@old_path', '@new_path'])
 
662
        command_template = commands.shlex_split_unicode(command_string)
 
663
        command_template.extend(['%(old_path)s', '%(new_path)s'])
733
664
        return klass(command_template, old_tree, new_tree, to_file,
734
665
                     path_encoding)
735
666
 
736
667
    @classmethod
737
 
    def make_from_diff_tree(klass, command_string, external_diff_options=None):
 
668
    def make_from_diff_tree(klass, command_string):
738
669
        def from_diff_tree(diff_tree):
739
 
            full_command_string = [command_string]
740
 
            if external_diff_options is not None:
741
 
                full_command_string += ' ' + external_diff_options
742
 
            return klass.from_string(full_command_string, diff_tree.old_tree,
 
670
            return klass.from_string(command_string, diff_tree.old_tree,
743
671
                                     diff_tree.new_tree, diff_tree.to_file)
744
672
        return from_diff_tree
745
673
 
746
674
    def _get_command(self, old_path, new_path):
747
675
        my_map = {'old_path': old_path, 'new_path': new_path}
748
 
        command = [AtTemplate(t).substitute(my_map) for t in
749
 
                   self.command_template]
750
 
        if sys.platform == 'win32': # Popen doesn't accept unicode on win32
751
 
            command_encoded = []
752
 
            for c in command:
753
 
                if isinstance(c, unicode):
754
 
                    command_encoded.append(c.encode('mbcs'))
755
 
                else:
756
 
                    command_encoded.append(c)
757
 
            return command_encoded
758
 
        else:
759
 
            return command
 
676
        return [t % my_map for t in self.command_template]
760
677
 
761
678
    def _execute(self, old_path, new_path):
762
679
        command = self._get_command(old_path, new_path)
782
699
                raise
783
700
        return True
784
701
 
785
 
    @staticmethod
786
 
    def _fenc():
787
 
        """Returns safe encoding for passing file path to diff tool"""
788
 
        if sys.platform == 'win32':
789
 
            return 'mbcs'
790
 
        else:
791
 
            # Don't fallback to 'utf-8' because subprocess may not be able to
792
 
            # handle utf-8 correctly when locale is not utf-8.
793
 
            return sys.getfilesystemencoding() or 'ascii'
794
 
 
795
 
    def _is_safepath(self, path):
796
 
        """Return true if `path` may be able to pass to subprocess."""
797
 
        fenc = self._fenc()
798
 
        try:
799
 
            return path == path.encode(fenc).decode(fenc)
800
 
        except UnicodeError:
801
 
            return False
802
 
 
803
 
    def _safe_filename(self, prefix, relpath):
804
 
        """Replace unsafe character in `relpath` then join `self._root`,
805
 
        `prefix` and `relpath`."""
806
 
        fenc = self._fenc()
807
 
        # encoded_str.replace('?', '_') may break multibyte char.
808
 
        # So we should encode, decode, then replace(u'?', u'_')
809
 
        relpath_tmp = relpath.encode(fenc, 'replace').decode(fenc, 'replace')
810
 
        relpath_tmp = relpath_tmp.replace(u'?', u'_')
811
 
        return osutils.pathjoin(self._root, prefix, relpath_tmp)
812
 
 
813
 
    def _write_file(self, file_id, tree, prefix, relpath, force_temp=False,
814
 
                    allow_write=False):
815
 
        if not force_temp and isinstance(tree, WorkingTree):
816
 
            full_path = tree.abspath(tree.id2path(file_id))
817
 
            if self._is_safepath(full_path):
818
 
                return full_path
819
 
 
820
 
        full_path = self._safe_filename(prefix, relpath)
821
 
        if not force_temp and self._try_symlink_root(tree, prefix):
 
702
    def _write_file(self, file_id, tree, prefix, relpath):
 
703
        full_path = osutils.pathjoin(self._root, prefix, relpath)
 
704
        if self._try_symlink_root(tree, prefix):
822
705
            return full_path
823
706
        parent_dir = osutils.dirname(full_path)
824
707
        try:
835
718
                target.close()
836
719
        finally:
837
720
            source.close()
838
 
        try:
839
 
            mtime = tree.get_file_mtime(file_id)
840
 
        except errors.FileTimestampUnavailable:
841
 
            pass
842
 
        else:
843
 
            os.utime(full_path, (mtime, mtime))
844
 
        if not allow_write:
845
 
            osutils.make_readonly(full_path)
 
721
        osutils.make_readonly(full_path)
 
722
        mtime = tree.get_file_mtime(file_id)
 
723
        os.utime(full_path, (mtime, mtime))
846
724
        return full_path
847
725
 
848
 
    def _prepare_files(self, file_id, old_path, new_path, force_temp=False,
849
 
                       allow_write_new=False):
 
726
    def _prepare_files(self, file_id, old_path, new_path):
850
727
        old_disk_path = self._write_file(file_id, self.old_tree, 'old',
851
 
                                         old_path, force_temp)
 
728
                                         old_path)
852
729
        new_disk_path = self._write_file(file_id, self.new_tree, 'new',
853
 
                                         new_path, force_temp,
854
 
                                         allow_write=allow_write_new)
 
730
                                         new_path)
855
731
        return old_disk_path, new_disk_path
856
732
 
857
733
    def finish(self):
858
 
        try:
859
 
            osutils.rmtree(self._root)
860
 
        except OSError, e:
861
 
            if e.errno != errno.ENOENT:
862
 
                mutter("The temporary directory \"%s\" was not "
863
 
                        "cleanly removed: %s." % (self._root, e))
 
734
        osutils.rmtree(self._root)
864
735
 
865
736
    def diff(self, file_id, old_path, new_path, old_kind, new_kind):
866
737
        if (old_kind, new_kind) != ('file', 'file'):
867
738
            return DiffPath.CANNOT_DIFF
868
 
        (old_disk_path, new_disk_path) = self._prepare_files(
869
 
                                                file_id, old_path, new_path)
870
 
        self._execute(old_disk_path, new_disk_path)
871
 
 
872
 
    def edit_file(self, file_id):
873
 
        """Use this tool to edit a file.
874
 
 
875
 
        A temporary copy will be edited, and the new contents will be
876
 
        returned.
877
 
 
878
 
        :param file_id: The id of the file to edit.
879
 
        :return: The new contents of the file.
880
 
        """
881
 
        old_path = self.old_tree.id2path(file_id)
882
 
        new_path = self.new_tree.id2path(file_id)
883
 
        old_abs_path, new_abs_path = self._prepare_files(
884
 
                                            file_id, old_path, new_path,
885
 
                                            allow_write_new=True,
886
 
                                            force_temp=True)
887
 
        command = self._get_command(old_abs_path, new_abs_path)
888
 
        subprocess.call(command, cwd=self._root)
889
 
        new_file = open(new_abs_path, 'rb')
890
 
        try:
891
 
            return new_file.read()
892
 
        finally:
893
 
            new_file.close()
 
739
        self._prepare_files(file_id, old_path, new_path)
 
740
        self._execute(osutils.pathjoin('old', old_path),
 
741
                      osutils.pathjoin('new', new_path))
894
742
 
895
743
 
896
744
class DiffTree(object):
942
790
        """Factory for producing a DiffTree.
943
791
 
944
792
        Designed to accept options used by show_diff_trees.
945
 
 
946
793
        :param old_tree: The tree to show as old in the comparison
947
794
        :param new_tree: The tree to show as new in the comparison
948
795
        :param to_file: File to write comparisons to
954
801
        :param using: Commandline to use to invoke an external diff tool
955
802
        """
956
803
        if using is not None:
957
 
            extra_factories = [DiffFromTool.make_from_diff_tree(using, external_diff_options)]
 
804
            extra_factories = [DiffFromTool.make_from_diff_tree(using)]
958
805
        else:
959
806
            extra_factories = []
960
807
        if external_diff_options:
961
808
            opts = external_diff_options.split()
962
 
            def diff_file(olab, olines, nlab, nlines, to_file, path_encoding=None):
963
 
                """:param path_encoding: not used but required
964
 
                        to match the signature of internal_diff.
965
 
                """
 
809
            def diff_file(olab, olines, nlab, nlines, to_file):
966
810
                external_diff(olab, olines, nlab, nlines, to_file, opts)
967
811
        else:
968
812
            diff_file = internal_diff
974
818
    def show_diff(self, specific_files, extra_trees=None):
975
819
        """Write tree diff to self.to_file
976
820
 
977
 
        :param specific_files: the specific files to compare (recursive)
 
821
        :param sepecific_files: the specific files to compare (recursive)
978
822
        :param extra_trees: extra trees to use for mapping paths to file_ids
979
823
        """
980
824
        try:
1038
882
                self.to_file.write("=== modified %s '%s'%s\n" % (kind[0],
1039
883
                                   newpath_encoded, prop_str))
1040
884
            if changed_content:
1041
 
                self._diff(file_id, oldpath, newpath, kind[0], kind[1])
 
885
                self.diff(file_id, oldpath, newpath)
1042
886
                has_changes = 1
1043
887
            if renamed:
1044
888
                has_changes = 1
1059
903
            new_kind = self.new_tree.kind(file_id)
1060
904
        except (errors.NoSuchId, errors.NoSuchFile):
1061
905
            new_kind = None
1062
 
        self._diff(file_id, old_path, new_path, old_kind, new_kind)
1063
 
 
1064
 
 
1065
 
    def _diff(self, file_id, old_path, new_path, old_kind, new_kind):
 
906
 
1066
907
        result = DiffPath._diff_many(self.differs, file_id, old_path,
1067
908
                                       new_path, old_kind, new_kind)
1068
909
        if result is DiffPath.CANNOT_DIFF:
1070
911
            if error_path is None:
1071
912
                error_path = old_path
1072
913
            raise errors.NoDiffFound(error_path)
1073
 
 
1074
 
 
1075
 
format_registry = Registry()
1076
 
format_registry.register('default', DiffTree)