1
# Copyright (C) 2004, 2005, 2006 Canonical Ltd.
3
# This program is free software; you can redistribute it and/or modify
4
# it under the terms of the GNU General Public License as published by
5
# the Free Software Foundation; either version 2 of the License, or
6
# (at your option) any later version.
8
# This program is distributed in the hope that it will be useful,
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11
# GNU General Public License for more details.
13
# You should have received a copy of the GNU General Public License
14
# along with this program; if not, write to the Free Software
15
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21
from bzrlib.lazy_import import lazy_import
22
lazy_import(globals(), """
36
# compatability - plugins import compare_trees from diff!!!
37
# deprecated as of 0.10
38
from bzrlib.delta import compare_trees
39
from bzrlib.symbol_versioning import (
43
from bzrlib.trace import mutter, warning
46
# TODO: Rather than building a changeset object, we should probably
47
# invoke callbacks on an object. That object can either accumulate a
48
# list, write them out directly, etc etc.
50
def internal_diff(old_filename, oldlines, new_filename, newlines, to_file,
51
allow_binary=False, sequence_matcher=None,
52
path_encoding='utf8'):
53
# FIXME: difflib is wrong if there is no trailing newline.
54
# The syntax used by patch seems to be "\ No newline at
55
# end of file" following the last diff line from that
56
# file. This is not trivial to insert into the
57
# unified_diff output and it might be better to just fix
58
# or replace that function.
60
# In the meantime we at least make sure the patch isn't
64
# Special workaround for Python2.3, where difflib fails if
65
# both sequences are empty.
66
if not oldlines and not newlines:
69
if allow_binary is False:
70
textfile.check_text_lines(oldlines)
71
textfile.check_text_lines(newlines)
73
if sequence_matcher is None:
74
sequence_matcher = patiencediff.PatienceSequenceMatcher
75
ud = patiencediff.unified_diff(oldlines, newlines,
76
fromfile=old_filename.encode(path_encoding),
77
tofile=new_filename.encode(path_encoding),
78
sequencematcher=sequence_matcher)
81
# work-around for difflib being too smart for its own good
82
# if /dev/null is "1,0", patch won't recognize it as /dev/null
84
ud[2] = ud[2].replace('-1,0', '-0,0')
86
ud[2] = ud[2].replace('+1,0', '+0,0')
87
# work around for difflib emitting random spaces after the label
88
ud[0] = ud[0][:-2] + '\n'
89
ud[1] = ud[1][:-2] + '\n'
93
if not line.endswith('\n'):
94
to_file.write("\n\\ No newline at end of file\n")
99
"""Set the env var LANG=C"""
100
osutils.set_or_unset_env('LANG', 'C')
101
osutils.set_or_unset_env('LC_ALL', None)
102
osutils.set_or_unset_env('LC_CTYPE', None)
103
osutils.set_or_unset_env('LANGUAGE', None)
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
This lets us read and understand the output of diff, and respond
113
:return: A Popen object.
116
if sys.platform == 'win32':
117
# Win32 doesn't support preexec_fn, but that is
118
# okay, because it doesn't support LANG either.
121
preexec_fn = _set_lang_C
122
stderr = subprocess.PIPE
128
pipe = subprocess.Popen(diffcmd,
129
stdin=subprocess.PIPE,
130
stdout=subprocess.PIPE,
132
preexec_fn=preexec_fn)
134
if e.errno == errno.ENOENT:
135
raise errors.NoDiff(str(e))
141
def external_diff(old_filename, oldlines, new_filename, newlines, to_file,
143
"""Display a diff by calling out to the external diff program."""
144
# make sure our own output is properly ordered before the diff
147
oldtmp_fd, old_abspath = tempfile.mkstemp(prefix='bzr-diff-old-')
148
newtmp_fd, new_abspath = tempfile.mkstemp(prefix='bzr-diff-new-')
149
oldtmpf = os.fdopen(oldtmp_fd, 'wb')
150
newtmpf = os.fdopen(newtmp_fd, 'wb')
153
# TODO: perhaps a special case for comparing to or from the empty
154
# sequence; can just use /dev/null on Unix
156
# TODO: if either of the files being compared already exists as a
157
# regular named file (e.g. in the working directory) then we can
158
# compare directly to that, rather than copying it.
160
oldtmpf.writelines(oldlines)
161
newtmpf.writelines(newlines)
169
'--label', old_filename,
171
'--label', new_filename,
176
# diff only allows one style to be specified; they don't override.
177
# note that some of these take optargs, and the optargs can be
178
# directly appended to the options.
179
# this is only an approximate parser; it doesn't properly understand
181
for s in ['-c', '-u', '-C', '-U',
186
'-y', '--side-by-side',
198
diffcmd.extend(diff_opts)
200
pipe = _spawn_external_diff(diffcmd, capture_errors=True)
201
out,err = pipe.communicate()
204
# internal_diff() adds a trailing newline, add one here for consistency
207
# 'diff' gives retcode == 2 for all sorts of errors
208
# one of those is 'Binary files differ'.
209
# Bad options could also be the problem.
210
# 'Binary files' is not a real error, so we suppress that error.
213
# Since we got here, we want to make sure to give an i18n error
214
pipe = _spawn_external_diff(diffcmd, capture_errors=False)
215
out, err = pipe.communicate()
217
# Write out the new i18n diff response
218
to_file.write(out+'\n')
219
if pipe.returncode != 2:
220
raise errors.BzrError(
221
'external diff failed with exit code 2'
222
' when run with LANG=C, but not when run'
223
' natively: %r' % (diffcmd,))
225
first_line = lang_c_out.split('\n', 1)[0]
226
# Starting with diffutils 2.8.4 the word "binary" was dropped.
227
m = re.match('^(binary )?files.*differ$', first_line, re.I)
229
raise errors.BzrError('external diff failed with exit code 2;'
230
' command: %r' % (diffcmd,))
232
# Binary files differ, just return
235
# If we got to here, we haven't written out the output of diff
239
# returns 1 if files differ; that's OK
241
msg = 'signal %d' % (-rc)
243
msg = 'exit code %d' % rc
245
raise errors.BzrError('external diff failed with %s; command: %r'
250
oldtmpf.close() # and delete
252
# Clean up. Warn in case the files couldn't be deleted
253
# (in case windows still holds the file open, but not
254
# if the files have already been deleted)
256
os.remove(old_abspath)
258
if e.errno not in (errno.ENOENT,):
259
warning('Failed to delete temporary file: %s %s',
262
os.remove(new_abspath)
264
if e.errno not in (errno.ENOENT,):
265
warning('Failed to delete temporary file: %s %s',
269
@deprecated_function(zero_eight)
270
def show_diff(b, from_spec, specific_files, external_diff_options=None,
271
revision2=None, output=None, b2=None):
272
"""Shortcut for showing the diff to the working tree.
274
Please use show_diff_trees instead.
280
None for 'basis tree', or otherwise the old revision to compare against.
282
The more general form is show_diff_trees(), where the caller
283
supplies any two trees.
288
if from_spec is None:
289
old_tree = b.bzrdir.open_workingtree()
291
old_tree = old_tree = old_tree.basis_tree()
293
old_tree = b.repository.revision_tree(from_spec.in_history(b).rev_id)
295
if revision2 is None:
297
new_tree = b.bzrdir.open_workingtree()
299
new_tree = b2.bzrdir.open_workingtree()
301
new_tree = b.repository.revision_tree(revision2.in_history(b).rev_id)
303
return show_diff_trees(old_tree, new_tree, output, specific_files,
304
external_diff_options)
307
def diff_cmd_helper(tree, specific_files, external_diff_options,
308
old_revision_spec=None, new_revision_spec=None,
309
old_label='a/', new_label='b/'):
310
"""Helper for cmd_diff.
316
The specific files to compare, or None
318
external_diff_options
319
If non-None, run an external diff, and pass it these options
322
If None, use basis tree as old revision, otherwise use the tree for
323
the specified revision.
326
If None, use working tree as new revision, otherwise use the tree for
327
the specified revision.
329
The more general form is show_diff_trees(), where the caller
330
supplies any two trees.
334
revision = spec.in_store(tree.branch)
336
revision = spec.in_store(None)
337
revision_id = revision.rev_id
338
branch = revision.branch
339
return branch.repository.revision_tree(revision_id)
340
if old_revision_spec is None:
341
old_tree = tree.basis_tree()
343
old_tree = spec_tree(old_revision_spec)
345
if new_revision_spec is None:
348
new_tree = spec_tree(new_revision_spec)
349
if new_tree is not tree:
350
extra_trees = (tree,)
354
return show_diff_trees(old_tree, new_tree, sys.stdout, specific_files,
355
external_diff_options,
356
old_label=old_label, new_label=new_label,
357
extra_trees=extra_trees)
360
def show_diff_trees(old_tree, new_tree, to_file, specific_files=None,
361
external_diff_options=None,
362
old_label='a/', new_label='b/',
364
"""Show in text form the changes from one tree to another.
367
If set, include only changes to these files.
369
external_diff_options
370
If set, use an external GNU diff and pass these options.
373
If set, more Trees to use for looking up file ids
379
return _show_diff_trees(old_tree, new_tree, to_file,
380
specific_files, external_diff_options,
381
old_label=old_label, new_label=new_label,
382
extra_trees=extra_trees)
389
def _show_diff_trees(old_tree, new_tree, to_file,
390
specific_files, external_diff_options,
391
old_label='a/', new_label='b/', extra_trees=None):
393
# GNU Patch uses the epoch date to detect files that are being added
394
# or removed in a diff.
395
EPOCH_DATE = '1970-01-01 00:00:00 +0000'
397
# TODO: Generation of pseudo-diffs for added/deleted files could
398
# be usefully made into a much faster special case.
400
if external_diff_options:
401
assert isinstance(external_diff_options, basestring)
402
opts = external_diff_options.split()
403
def diff_file(olab, olines, nlab, nlines, to_file):
404
external_diff(olab, olines, nlab, nlines, to_file, opts)
406
diff_file = internal_diff
408
delta = new_tree.changes_from(old_tree,
409
specific_files=specific_files,
410
extra_trees=extra_trees, require_versioned=True)
413
for path, file_id, kind in delta.removed:
415
print >>to_file, '=== removed %s %r' % (kind, path.encode('utf8'))
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)
421
for path, file_id, kind in delta.added:
423
print >>to_file, '=== added %s %r' % (kind, path.encode('utf8'))
424
old_name = '%s%s\t%s' % (old_label, path, EPOCH_DATE)
425
new_name = '%s%s\t%s' % (new_label, path,
426
_patch_header_date(new_tree, file_id, path))
427
new_tree.inventory[file_id].diff(diff_file, new_name, new_tree,
428
old_name, None, None, to_file,
430
for (old_path, new_path, file_id, kind,
431
text_modified, meta_modified) in delta.renamed:
433
prop_str = get_prop_change(meta_modified)
434
print >>to_file, '=== renamed %s %r => %r%s' % (
435
kind, old_path.encode('utf8'),
436
new_path.encode('utf8'), prop_str)
437
old_name = '%s%s\t%s' % (old_label, old_path,
438
_patch_header_date(old_tree, file_id,
440
new_name = '%s%s\t%s' % (new_label, new_path,
441
_patch_header_date(new_tree, file_id,
443
_maybe_diff_file_or_symlink(old_name, old_tree, file_id,
445
text_modified, kind, to_file, diff_file)
446
for path, file_id, kind, text_modified, meta_modified in delta.modified:
448
prop_str = get_prop_change(meta_modified)
449
print >>to_file, '=== modified %s %r%s' % (kind, path.encode('utf8'), prop_str)
450
old_name = '%s%s\t%s' % (old_label, path,
451
_patch_header_date(old_tree, file_id, path))
452
new_name = '%s%s\t%s' % (new_label, path,
453
_patch_header_date(new_tree, file_id, path))
455
_maybe_diff_file_or_symlink(old_name, old_tree, file_id,
457
True, kind, to_file, diff_file)
462
def _patch_header_date(tree, file_id, path):
463
"""Returns a timestamp suitable for use in a patch header."""
464
tm = time.gmtime(tree.get_file_mtime(file_id, path))
465
return time.strftime('%Y-%m-%d %H:%M:%S +0000', tm)
468
def _raise_if_nonexistent(paths, old_tree, new_tree):
469
"""Complain if paths are not in either inventory or tree.
471
It's OK with the files exist in either tree's inventory, or
472
if they exist in the tree but are not versioned.
474
This can be used by operations such as bzr status that can accept
475
unknown or ignored files.
477
mutter("check paths: %r", paths)
480
s = old_tree.filter_unversioned_files(paths)
481
s = new_tree.filter_unversioned_files(s)
482
s = [path for path in s if not new_tree.has_filename(path)]
484
raise errors.PathsDoNotExist(sorted(s))
487
def get_prop_change(meta_modified):
489
return " (properties changed)"
494
def _maybe_diff_file_or_symlink(old_path, old_tree, file_id,
495
new_path, new_tree, text_modified,
496
kind, to_file, diff_file):
498
new_entry = new_tree.inventory[file_id]
499
old_tree.inventory[file_id].diff(diff_file,
added
removed
bzrlib/diff.py
