2
# -*- coding: UTF-8 -*-
1
# Copyright (C) 2004, 2005, 2006 Canonical Ltd.
4
3
# This program is free software; you can redistribute it and/or modify
5
4
# it under the terms of the GNU General Public License as published by
6
5
# the Free Software Foundation; either version 2 of the License, or
7
6
# (at your option) any later version.
9
8
# This program is distributed in the hope that it will be useful,
10
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
11
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12
11
# GNU General Public License for more details.
14
13
# You should have received a copy of the GNU General Public License
15
14
# along with this program; if not, write to the Free Software
16
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
from bzrlib.trace import mutter
19
from bzrlib.errors import BzrError
20
from bzrlib.delta import compare_trees
22
from bzrlib.lazy_import import lazy_import
23
lazy_import(globals(), """
38
from bzrlib.symbol_versioning import (
41
from bzrlib.trace import mutter, warning
22
44
# TODO: Rather than building a changeset object, we should probably
23
45
# invoke callbacks on an object. That object can either accumulate a
24
46
# list, write them out directly, etc etc.
26
def internal_diff(old_label, oldlines, new_label, newlines, to_file):
49
class _PrematchedMatcher(difflib.SequenceMatcher):
50
"""Allow SequenceMatcher operations to use predetermined blocks"""
52
def __init__(self, matching_blocks):
53
difflib.SequenceMatcher(self, None, None)
54
self.matching_blocks = matching_blocks
58
def internal_diff(old_filename, oldlines, new_filename, newlines, to_file,
59
allow_binary=False, sequence_matcher=None,
60
path_encoding='utf8'):
29
61
# FIXME: difflib is wrong if there is no trailing newline.
30
62
# The syntax used by patch seems to be "\ No newline at
31
63
# end of file" following the last diff line from that
41
73
# both sequences are empty.
42
74
if not oldlines and not newlines:
45
ud = difflib.unified_diff(oldlines, newlines,
46
fromfile=old_label, tofile=new_label)
77
if allow_binary is False:
78
textfile.check_text_lines(oldlines)
79
textfile.check_text_lines(newlines)
81
if sequence_matcher is None:
82
sequence_matcher = patiencediff.PatienceSequenceMatcher
83
ud = patiencediff.unified_diff(oldlines, newlines,
84
fromfile=old_filename.encode(path_encoding),
85
tofile=new_filename.encode(path_encoding),
86
sequencematcher=sequence_matcher)
48
89
# work-around for difflib being too smart for its own good
49
90
# if /dev/null is "1,0", patch won't recognize it as /dev/null
52
92
ud[2] = ud[2].replace('-1,0', '-0,0')
55
94
ud[2] = ud[2].replace('+1,0', '+0,0')
95
# work around for difflib emitting random spaces after the label
96
ud[0] = ud[0][:-2] + '\n'
97
ud[1] = ud[1][:-2] + '\n'
58
100
to_file.write(line)
59
101
if not line.endswith('\n'):
60
102
to_file.write("\n\\ No newline at end of file\n")
66
def external_diff(old_label, oldlines, new_label, newlines, to_file,
106
def _spawn_external_diff(diffcmd, capture_errors=True):
107
"""Spawn the externall diff process, and return the child handle.
109
:param diffcmd: The command list to spawn
110
:param capture_errors: Capture stderr as well as setting LANG=C
111
and LC_ALL=C. This lets us read and understand the output of diff,
112
and respond to any errors.
113
:return: A Popen object.
116
# construct minimal environment
118
path = os.environ.get('PATH')
121
env['LANGUAGE'] = 'C' # on win32 only LANGUAGE has effect
124
stderr = subprocess.PIPE
130
pipe = subprocess.Popen(diffcmd,
131
stdin=subprocess.PIPE,
132
stdout=subprocess.PIPE,
136
if e.errno == errno.ENOENT:
137
raise errors.NoDiff(str(e))
143
def external_diff(old_filename, oldlines, new_filename, newlines, to_file,
68
145
"""Display a diff by calling out to the external diff program."""
71
if to_file != sys.stdout:
72
raise NotImplementedError("sorry, can't send external diff other than to stdout yet",
75
146
# make sure our own output is properly ordered before the diff
78
from tempfile import NamedTemporaryFile
81
oldtmpf = NamedTemporaryFile()
82
newtmpf = NamedTemporaryFile()
149
oldtmp_fd, old_abspath = tempfile.mkstemp(prefix='bzr-diff-old-')
150
newtmp_fd, new_abspath = tempfile.mkstemp(prefix='bzr-diff-new-')
151
oldtmpf = os.fdopen(oldtmp_fd, 'wb')
152
newtmpf = os.fdopen(newtmp_fd, 'wb')
85
155
# TODO: perhaps a special case for comparing to or from the empty
128
200
diffcmd.extend(diff_opts)
130
rc = os.spawnvp(os.P_WAIT, 'diff', diffcmd)
202
pipe = _spawn_external_diff(diffcmd, capture_errors=True)
203
out,err = pipe.communicate()
132
if rc != 0 and rc != 1:
206
# internal_diff() adds a trailing newline, add one here for consistency
209
# 'diff' gives retcode == 2 for all sorts of errors
210
# one of those is 'Binary files differ'.
211
# Bad options could also be the problem.
212
# 'Binary files' is not a real error, so we suppress that error.
215
# Since we got here, we want to make sure to give an i18n error
216
pipe = _spawn_external_diff(diffcmd, capture_errors=False)
217
out, err = pipe.communicate()
219
# Write out the new i18n diff response
220
to_file.write(out+'\n')
221
if pipe.returncode != 2:
222
raise errors.BzrError(
223
'external diff failed with exit code 2'
224
' when run with LANG=C and LC_ALL=C,'
225
' but not when run natively: %r' % (diffcmd,))
227
first_line = lang_c_out.split('\n', 1)[0]
228
# Starting with diffutils 2.8.4 the word "binary" was dropped.
229
m = re.match('^(binary )?files.*differ$', first_line, re.I)
231
raise errors.BzrError('external diff failed with exit code 2;'
232
' command: %r' % (diffcmd,))
234
# Binary files differ, just return
237
# If we got to here, we haven't written out the output of diff
133
241
# returns 1 if files differ; that's OK
135
243
msg = 'signal %d' % (-rc)
137
245
msg = 'exit code %d' % rc
139
raise BzrError('external diff failed with %s; command: %r' % (rc, diffcmd))
247
raise errors.BzrError('external diff failed with %s; command: %r'
141
252
oldtmpf.close() # and delete
146
def show_diff(b, revision, specific_files, external_diff_options=None):
147
"""Shortcut for showing the diff to the working tree.
153
None for each, or otherwise the old revision to compare against.
254
# Clean up. Warn in case the files couldn't be deleted
255
# (in case windows still holds the file open, but not
256
# if the files have already been deleted)
258
os.remove(old_abspath)
260
if e.errno not in (errno.ENOENT,):
261
warning('Failed to delete temporary file: %s %s',
264
os.remove(new_abspath)
266
if e.errno not in (errno.ENOENT,):
267
warning('Failed to delete temporary file: %s %s',
271
def diff_cmd_helper(tree, specific_files, external_diff_options,
272
old_revision_spec=None, new_revision_spec=None,
274
old_label='a/', new_label='b/'):
275
"""Helper for cmd_diff.
280
:param specific_files:
281
The specific files to compare, or None
283
:param external_diff_options:
284
If non-None, run an external diff, and pass it these options
286
:param old_revision_spec:
287
If None, use basis tree as old revision, otherwise use the tree for
288
the specified revision.
290
:param new_revision_spec:
291
If None, use working tree as new revision, otherwise use the tree for
292
the specified revision.
294
:param revision_specs:
295
Zero, one or two RevisionSpecs from the command line, saying what revisions
296
to compare. This can be passed as an alternative to the old_revision_spec
297
and new_revision_spec parameters.
155
299
The more general form is show_diff_trees(), where the caller
156
300
supplies any two trees.
161
old_tree = b.basis_tree()
163
old_tree = b.revision_tree(b.lookup_revision(revision))
165
new_tree = b.working_tree()
167
show_diff_trees(old_tree, new_tree, sys.stdout, specific_files,
168
external_diff_options)
303
# TODO: perhaps remove the old parameters old_revision_spec and
304
# new_revision_spec, since this is only really for use from cmd_diff and
305
# it now always passes through a sequence of revision_specs -- mbp
310
revision = spec.in_store(tree.branch)
312
revision = spec.in_store(None)
313
revision_id = revision.rev_id
314
branch = revision.branch
315
return branch.repository.revision_tree(revision_id)
317
if revision_specs is not None:
318
assert (old_revision_spec is None
319
and new_revision_spec is None)
320
if len(revision_specs) > 0:
321
old_revision_spec = revision_specs[0]
322
if len(revision_specs) > 1:
323
new_revision_spec = revision_specs[1]
325
if old_revision_spec is None:
326
old_tree = tree.basis_tree()
328
old_tree = spec_tree(old_revision_spec)
330
if (new_revision_spec is None
331
or new_revision_spec.spec is None):
334
new_tree = spec_tree(new_revision_spec)
336
if new_tree is not tree:
337
extra_trees = (tree,)
341
return show_diff_trees(old_tree, new_tree, sys.stdout, specific_files,
342
external_diff_options,
343
old_label=old_label, new_label=new_label,
344
extra_trees=extra_trees)
172
347
def show_diff_trees(old_tree, new_tree, to_file, specific_files=None,
173
external_diff_options=None):
348
external_diff_options=None,
349
old_label='a/', new_label='b/',
351
path_encoding='utf8'):
174
352
"""Show in text form the changes from one tree to another.
179
357
external_diff_options
180
358
If set, use an external GNU diff and pass these options.
361
If set, more Trees to use for looking up file ids
364
If set, the path will be encoded as specified, otherwise is supposed
183
# TODO: Options to control putting on a prefix or suffix, perhaps as a format string
187
DEVNULL = '/dev/null'
188
# Windows users, don't panic about this filename -- it is a
189
# special signal to GNU patch that the file should be created or
190
# deleted respectively.
369
if extra_trees is not None:
370
for tree in extra_trees:
374
return _show_diff_trees(old_tree, new_tree, to_file,
375
specific_files, external_diff_options,
376
old_label=old_label, new_label=new_label,
377
extra_trees=extra_trees,
378
path_encoding=path_encoding)
381
if extra_trees is not None:
382
for tree in extra_trees:
388
def _show_diff_trees(old_tree, new_tree, to_file,
389
specific_files, external_diff_options, path_encoding,
390
old_label='a/', new_label='b/', extra_trees=None):
392
# GNU Patch uses the epoch date to detect files that are being added
393
# or removed in a diff.
394
EPOCH_DATE = '1970-01-01 00:00:00 +0000'
192
396
# TODO: Generation of pseudo-diffs for added/deleted files could
193
397
# be usefully made into a much faster special case.
201
405
diff_file = internal_diff
204
delta = compare_trees(old_tree, new_tree, want_unchanged=False,
205
specific_files=specific_files)
407
delta = new_tree.changes_from(old_tree,
408
specific_files=specific_files,
409
extra_trees=extra_trees, require_versioned=True)
207
412
for path, file_id, kind in delta.removed:
208
print >>to_file, '*** removed %s %r' % (kind, path)
210
diff_file(old_label + path,
211
old_tree.get_file(file_id).readlines(),
414
path_encoded = path.encode(path_encoding, "replace")
415
to_file.write("=== removed %s '%s'\n" % (kind, path_encoded))
416
old_name = '%s%s\t%s' % (old_label, path,
417
_patch_header_date(old_tree, file_id, path))
418
new_name = '%s%s\t%s' % (new_label, path, EPOCH_DATE)
419
old_tree.inventory[file_id].diff(diff_file, old_name, old_tree,
420
new_name, None, None, to_file)
216
421
for path, file_id, kind in delta.added:
217
print >>to_file, '*** added %s %r' % (kind, path)
222
new_tree.get_file(file_id).readlines(),
225
for old_path, new_path, file_id, kind, text_modified in delta.renamed:
226
print >>to_file, '*** renamed %s %r => %r' % (kind, old_path, new_path)
423
path_encoded = path.encode(path_encoding, "replace")
424
to_file.write("=== added %s '%s'\n" % (kind, path_encoded))
425
old_name = '%s%s\t%s' % (old_label, path, EPOCH_DATE)
426
new_name = '%s%s\t%s' % (new_label, path,
427
_patch_header_date(new_tree, file_id, path))
428
new_tree.inventory[file_id].diff(diff_file, new_name, new_tree,
429
old_name, None, None, to_file,
431
for (old_path, new_path, file_id, kind,
432
text_modified, meta_modified) in delta.renamed:
434
prop_str = get_prop_change(meta_modified)
435
oldpath_encoded = old_path.encode(path_encoding, "replace")
436
newpath_encoded = new_path.encode(path_encoding, "replace")
437
to_file.write("=== renamed %s '%s' => '%s'%s\n" % (kind,
438
oldpath_encoded, newpath_encoded, prop_str))
439
old_name = '%s%s\t%s' % (old_label, old_path,
440
_patch_header_date(old_tree, file_id,
442
new_name = '%s%s\t%s' % (new_label, new_path,
443
_patch_header_date(new_tree, file_id,
445
_maybe_diff_file_or_symlink(old_name, old_tree, file_id,
447
text_modified, kind, to_file, diff_file)
448
for path, file_id, kind, text_modified, meta_modified in delta.modified:
450
prop_str = get_prop_change(meta_modified)
451
path_encoded = path.encode(path_encoding, "replace")
452
to_file.write("=== modified %s '%s'%s\n" % (kind,
453
path_encoded, prop_str))
454
# The file may be in a different location in the old tree (because
455
# the containing dir was renamed, but the file itself was not)
456
old_path = old_tree.id2path(file_id)
457
old_name = '%s%s\t%s' % (old_label, old_path,
458
_patch_header_date(old_tree, file_id, old_path))
459
new_name = '%s%s\t%s' % (new_label, path,
460
_patch_header_date(new_tree, file_id, path))
227
461
if text_modified:
228
diff_file(old_label + old_path,
229
old_tree.get_file(file_id).readlines(),
230
new_label + new_path,
231
new_tree.get_file(file_id).readlines(),
234
for path, file_id, kind in delta.modified:
235
print >>to_file, '*** modified %s %r' % (kind, path)
237
diff_file(old_label + path,
238
old_tree.get_file(file_id).readlines(),
240
new_tree.get_file(file_id).readlines(),
462
_maybe_diff_file_or_symlink(old_name, old_tree, file_id,
464
True, kind, to_file, diff_file)
469
def _patch_header_date(tree, file_id, path):
470
"""Returns a timestamp suitable for use in a patch header."""
471
mtime = tree.get_file_mtime(file_id, path)
472
assert mtime is not None, \
473
"got an mtime of None for file-id %s, path %s in tree %s" % (
475
return timestamp.format_patch_date(mtime)
478
def _raise_if_nonexistent(paths, old_tree, new_tree):
479
"""Complain if paths are not in either inventory or tree.
481
It's OK with the files exist in either tree's inventory, or
482
if they exist in the tree but are not versioned.
484
This can be used by operations such as bzr status that can accept
485
unknown or ignored files.
487
mutter("check paths: %r", paths)
490
s = old_tree.filter_unversioned_files(paths)
491
s = new_tree.filter_unversioned_files(s)
492
s = [path for path in s if not new_tree.has_filename(path)]
494
raise errors.PathsDoNotExist(sorted(s))
497
def get_prop_change(meta_modified):
499
return " (properties changed)"
504
def _maybe_diff_file_or_symlink(old_path, old_tree, file_id,
505
new_path, new_tree, text_modified,
506
kind, to_file, diff_file):
508
new_entry = new_tree.inventory[file_id]
509
old_tree.inventory[file_id].diff(diff_file,