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  • Committer: Robert Collins
  • Date: 2009-08-24 21:05:09 UTC
  • mto: This revision was merged to the branch mainline in revision 4645.
  • Revision ID: robertc@robertcollins.net-20090824210509-pproia2q9evq1nsl
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bzrlib/diff.py
1
 
# Copyright (C) 2005-2014 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
14
14
# along with this program; if not, write to the Free Software
15
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
16
16
 
17
 
from __future__ import absolute_import
18
 
 
19
17
import difflib
20
18
import os
21
19
import re
22
 
import string
 
20
import shutil
23
21
import sys
24
22
 
25
 
from .lazy_import import lazy_import
 
23
from bzrlib.lazy_import import lazy_import
26
24
lazy_import(globals(), """
27
25
import errno
28
26
import subprocess
29
27
import tempfile
 
28
import time
30
29
 
31
 
from breezy import (
32
 
    cleanup,
33
 
    cmdline,
34
 
    controldir,
 
30
from bzrlib import (
 
31
    branch as _mod_branch,
 
32
    bzrdir,
 
33
    commands,
35
34
    errors,
36
35
    osutils,
37
36
    patiencediff,
39
38
    timestamp,
40
39
    views,
41
40
    )
42
 
 
43
 
from breezy.workingtree import WorkingTree
44
 
from breezy.i18n import gettext
45
41
""")
46
42
 
47
 
from .registry import (
48
 
    Registry,
 
43
from bzrlib.symbol_versioning import (
 
44
    deprecated_function,
49
45
    )
50
 
from .sixish import text_type
51
 
from .trace import mutter, note, warning
52
 
from .tree import FileTimestampUnavailable
53
 
 
54
 
 
55
 
DEFAULT_CONTEXT_AMOUNT = 3
56
 
 
57
 
class AtTemplate(string.Template):
58
 
    """Templating class that uses @ instead of $."""
59
 
 
60
 
    delimiter = '@'
 
46
from bzrlib.trace import mutter, note, warning
61
47
 
62
48
 
63
49
# TODO: Rather than building a changeset object, we should probably
74
60
        self.opcodes = None
75
61
 
76
62
 
77
 
def internal_diff(old_label, oldlines, new_label, newlines, to_file,
 
63
def internal_diff(old_filename, oldlines, new_filename, newlines, to_file,
78
64
                  allow_binary=False, sequence_matcher=None,
79
 
                  path_encoding='utf8', context_lines=DEFAULT_CONTEXT_AMOUNT):
 
65
                  path_encoding='utf8'):
80
66
    # FIXME: difflib is wrong if there is no trailing newline.
81
67
    # The syntax used by patch seems to be "\ No newline at
82
68
    # end of file" following the last diff line from that
87
73
    # In the meantime we at least make sure the patch isn't
88
74
    # mangled.
89
75
 
 
76
 
 
77
    # Special workaround for Python2.3, where difflib fails if
 
78
    # both sequences are empty.
 
79
    if not oldlines and not newlines:
 
80
        return
 
81
 
90
82
    if allow_binary is False:
91
83
        textfile.check_text_lines(oldlines)
92
84
        textfile.check_text_lines(newlines)
93
85
 
94
86
    if sequence_matcher is None:
95
87
        sequence_matcher = patiencediff.PatienceSequenceMatcher
96
 
    ud = patiencediff.unified_diff_bytes(oldlines, newlines,
97
 
                      fromfile=old_label.encode(path_encoding, 'replace'),
98
 
                      tofile=new_label.encode(path_encoding, 'replace'),
99
 
                      n=context_lines, sequencematcher=sequence_matcher)
 
88
    ud = patiencediff.unified_diff(oldlines, newlines,
 
89
                      fromfile=old_filename.encode(path_encoding),
 
90
                      tofile=new_filename.encode(path_encoding),
 
91
                      sequencematcher=sequence_matcher)
100
92
 
101
93
    ud = list(ud)
102
94
    if len(ud) == 0: # Identical contents, nothing to do
104
96
    # work-around for difflib being too smart for its own good
105
97
    # if /dev/null is "1,0", patch won't recognize it as /dev/null
106
98
    if not oldlines:
107
 
        ud[2] = ud[2].replace(b'-1,0', b'-0,0')
 
99
        ud[2] = ud[2].replace('-1,0', '-0,0')
108
100
    elif not newlines:
109
 
        ud[2] = ud[2].replace(b'+1,0', b'+0,0')
 
101
        ud[2] = ud[2].replace('+1,0', '+0,0')
110
102
 
111
103
    for line in ud:
112
104
        to_file.write(line)
113
 
        if not line.endswith(b'\n'):
114
 
            to_file.write(b"\n\\ No newline at end of file\n")
115
 
    to_file.write(b'\n')
 
105
        if not line.endswith('\n'):
 
106
            to_file.write("\n\\ No newline at end of file\n")
 
107
    to_file.write('\n')
116
108
 
117
109
 
118
110
def _spawn_external_diff(diffcmd, capture_errors=True):
119
 
    """Spawn the external diff process, and return the child handle.
 
111
    """Spawn the externall diff process, and return the child handle.
120
112
 
121
113
    :param diffcmd: The command list to spawn
122
114
    :param capture_errors: Capture stderr as well as setting LANG=C
144
136
                                stdout=subprocess.PIPE,
145
137
                                stderr=stderr,
146
138
                                env=env)
147
 
    except OSError as e:
 
139
    except OSError, e:
148
140
        if e.errno == errno.ENOENT:
149
141
            raise errors.NoDiff(str(e))
150
142
        raise
151
143
 
152
144
    return pipe
153
145
 
154
 
# diff style options as of GNU diff v3.2
155
 
style_option_list = ['-c', '-C', '--context',
156
 
                     '-e', '--ed',
157
 
                     '-f', '--forward-ed',
158
 
                     '-q', '--brief',
159
 
                     '--normal',
160
 
                     '-n', '--rcs',
161
 
                     '-u', '-U', '--unified',
162
 
                     '-y', '--side-by-side',
163
 
                     '-D', '--ifdef']
164
 
 
165
 
def default_style_unified(diff_opts):
166
 
    """Default to unified diff style if alternative not specified in diff_opts.
167
 
 
168
 
        diff only allows one style to be specified; they don't override.
169
 
        Note that some of these take optargs, and the optargs can be
170
 
        directly appended to the options.
171
 
        This is only an approximate parser; it doesn't properly understand
172
 
        the grammar.
173
 
 
174
 
    :param diff_opts: List of options for external (GNU) diff.
175
 
    :return: List of options with default style=='unified'.
176
 
    """
177
 
    for s in style_option_list:
178
 
        for j in diff_opts:
179
 
            if j.startswith(s):
180
 
                break
181
 
        else:
182
 
            continue
183
 
        break
184
 
    else:
185
 
        diff_opts.append('-u')
186
 
    return diff_opts
187
 
 
188
 
 
189
 
def external_diff(old_label, oldlines, new_label, newlines, to_file,
 
146
 
 
147
def external_diff(old_filename, oldlines, new_filename, newlines, to_file,
190
148
                  diff_opts):
191
149
    """Display a diff by calling out to the external diff program."""
192
150
    # make sure our own output is properly ordered before the diff
193
151
    to_file.flush()
194
152
 
195
 
    oldtmp_fd, old_abspath = tempfile.mkstemp(prefix='brz-diff-old-')
196
 
    newtmp_fd, new_abspath = tempfile.mkstemp(prefix='brz-diff-new-')
 
153
    oldtmp_fd, old_abspath = tempfile.mkstemp(prefix='bzr-diff-old-')
 
154
    newtmp_fd, new_abspath = tempfile.mkstemp(prefix='bzr-diff-new-')
197
155
    oldtmpf = os.fdopen(oldtmp_fd, 'wb')
198
156
    newtmpf = os.fdopen(newtmp_fd, 'wb')
199
157
 
216
174
        if sys.platform == 'win32':
217
175
            # Popen doesn't do the proper encoding for external commands
218
176
            # Since we are dealing with an ANSI api, use mbcs encoding
219
 
            old_label = old_label.encode('mbcs')
220
 
            new_label = new_label.encode('mbcs')
 
177
            old_filename = old_filename.encode('mbcs')
 
178
            new_filename = new_filename.encode('mbcs')
221
179
        diffcmd = ['diff',
222
 
                   '--label', old_label,
 
180
                   '--label', old_filename,
223
181
                   old_abspath,
224
 
                   '--label', new_label,
 
182
                   '--label', new_filename,
225
183
                   new_abspath,
226
184
                   '--binary',
227
185
                  ]
228
186
 
229
 
        diff_opts = default_style_unified(diff_opts)
 
187
        # diff only allows one style to be specified; they don't override.
 
188
        # note that some of these take optargs, and the optargs can be
 
189
        # directly appended to the options.
 
190
        # this is only an approximate parser; it doesn't properly understand
 
191
        # the grammar.
 
192
        for s in ['-c', '-u', '-C', '-U',
 
193
                  '-e', '--ed',
 
194
                  '-q', '--brief',
 
195
                  '--normal',
 
196
                  '-n', '--rcs',
 
197
                  '-y', '--side-by-side',
 
198
                  '-D', '--ifdef']:
 
199
            for j in diff_opts:
 
200
                if j.startswith(s):
 
201
                    break
 
202
            else:
 
203
                continue
 
204
            break
 
205
        else:
 
206
            diffcmd.append('-u')
230
207
 
231
208
        if diff_opts:
232
209
            diffcmd.extend(diff_opts)
233
210
 
234
211
        pipe = _spawn_external_diff(diffcmd, capture_errors=True)
235
 
        out, err = pipe.communicate()
 
212
        out,err = pipe.communicate()
236
213
        rc = pipe.returncode
237
214
 
238
215
        # internal_diff() adds a trailing newline, add one here for consistency
239
 
        out += b'\n'
 
216
        out += '\n'
240
217
        if rc == 2:
241
218
            # 'diff' gives retcode == 2 for all sorts of errors
242
219
            # one of those is 'Binary files differ'.
249
226
            out, err = pipe.communicate()
250
227
 
251
228
            # Write out the new i18n diff response
252
 
            to_file.write(out+b'\n')
 
229
            to_file.write(out+'\n')
253
230
            if pipe.returncode != 2:
254
231
                raise errors.BzrError(
255
232
                               'external diff failed with exit code 2'
256
233
                               ' when run with LANG=C and LC_ALL=C,'
257
234
                               ' but not when run natively: %r' % (diffcmd,))
258
235
 
259
 
            first_line = lang_c_out.split(b'\n', 1)[0]
 
236
            first_line = lang_c_out.split('\n', 1)[0]
260
237
            # Starting with diffutils 2.8.4 the word "binary" was dropped.
261
 
            m = re.match(b'^(binary )?files.*differ$', first_line, re.I)
 
238
            m = re.match('^(binary )?files.*differ$', first_line, re.I)
262
239
            if m is None:
263
240
                raise errors.BzrError('external diff failed with exit code 2;'
264
241
                                      ' command: %r' % (diffcmd,))
277
254
                msg = 'exit code %d' % rc
278
255
 
279
256
            raise errors.BzrError('external diff failed with %s; command: %r'
280
 
                                  % (msg, diffcmd))
 
257
                                  % (rc, diffcmd))
281
258
 
282
259
 
283
260
    finally:
284
261
        oldtmpf.close()                 # and delete
285
262
        newtmpf.close()
286
 
 
287
 
        def cleanup(path):
288
 
            # Warn in case the file couldn't be deleted (in case windows still
289
 
            # holds the file open, but not if the files have already been
290
 
            # deleted)
291
 
            try:
292
 
                os.remove(path)
293
 
            except OSError as e:
294
 
                if e.errno not in (errno.ENOENT,):
295
 
                    warning('Failed to delete temporary file: %s %s', path, e)
296
 
 
297
 
        cleanup(old_abspath)
298
 
        cleanup(new_abspath)
299
 
 
300
 
 
301
 
def get_trees_and_branches_to_diff_locked(
302
 
    path_list, revision_specs, old_url, new_url, add_cleanup, apply_view=True):
 
263
        # Clean up. Warn in case the files couldn't be deleted
 
264
        # (in case windows still holds the file open, but not
 
265
        # if the files have already been deleted)
 
266
        try:
 
267
            os.remove(old_abspath)
 
268
        except OSError, e:
 
269
            if e.errno not in (errno.ENOENT,):
 
270
                warning('Failed to delete temporary file: %s %s',
 
271
                        old_abspath, e)
 
272
        try:
 
273
            os.remove(new_abspath)
 
274
        except OSError:
 
275
            if e.errno not in (errno.ENOENT,):
 
276
                warning('Failed to delete temporary file: %s %s',
 
277
                        new_abspath, e)
 
278
 
 
279
 
 
280
def _get_trees_to_diff(path_list, revision_specs, old_url, new_url,
 
281
    apply_view=True):
303
282
    """Get the trees and specific files to diff given a list of paths.
304
283
 
305
284
    This method works out the trees to be diff'ed and the files of
316
295
    :param new_url:
317
296
        The url of the new branch or tree. If None, the tree to use is
318
297
        taken from the first path, if any, or the current working tree.
319
 
    :param add_cleanup:
320
 
        a callable like Command.add_cleanup.  get_trees_and_branches_to_diff
321
 
        will register cleanups that must be run to unlock the trees, etc.
322
298
    :param apply_view:
323
299
        if True and a view is set, apply the view or check that the paths
324
300
        are within it
325
301
    :returns:
326
 
        a tuple of (old_tree, new_tree, old_branch, new_branch,
327
 
        specific_files, extra_trees) where extra_trees is a sequence of
328
 
        additional trees to search in for file-ids.  The trees and branches
329
 
        will be read-locked until the cleanups registered via the add_cleanup
330
 
        param are run.
 
302
        a tuple of (old_tree, new_tree, specific_files, extra_trees) where
 
303
        extra_trees is a sequence of additional trees to search in for
 
304
        file-ids.
331
305
    """
332
306
    # Get the old and new revision specs
333
307
    old_revision_spec = None
356
330
        default_location = path_list[0]
357
331
        other_paths = path_list[1:]
358
332
 
359
 
    def lock_tree_or_branch(wt, br):
360
 
        if wt is not None:
361
 
            wt.lock_read()
362
 
            add_cleanup(wt.unlock)
363
 
        elif br is not None:
364
 
            br.lock_read()
365
 
            add_cleanup(br.unlock)
366
 
 
367
333
    # Get the old location
368
334
    specific_files = []
369
335
    if old_url is None:
370
336
        old_url = default_location
371
337
    working_tree, branch, relpath = \
372
 
        controldir.ControlDir.open_containing_tree_or_branch(old_url)
373
 
    lock_tree_or_branch(working_tree, branch)
 
338
        bzrdir.BzrDir.open_containing_tree_or_branch(old_url)
374
339
    if consider_relpath and relpath != '':
375
340
        if working_tree is not None and apply_view:
376
341
            views.check_path_in_view(working_tree, relpath)
377
342
        specific_files.append(relpath)
378
343
    old_tree = _get_tree_to_diff(old_revision_spec, working_tree, branch)
379
 
    old_branch = branch
380
344
 
381
345
    # Get the new location
382
346
    if new_url is None:
383
347
        new_url = default_location
384
348
    if new_url != old_url:
385
349
        working_tree, branch, relpath = \
386
 
            controldir.ControlDir.open_containing_tree_or_branch(new_url)
387
 
        lock_tree_or_branch(working_tree, branch)
 
350
            bzrdir.BzrDir.open_containing_tree_or_branch(new_url)
388
351
        if consider_relpath and relpath != '':
389
352
            if working_tree is not None and apply_view:
390
353
                views.check_path_in_view(working_tree, relpath)
391
354
            specific_files.append(relpath)
392
355
    new_tree = _get_tree_to_diff(new_revision_spec, working_tree, branch,
393
356
        basis_is_default=working_tree is None)
394
 
    new_branch = branch
395
357
 
396
358
    # Get the specific files (all files is None, no files is [])
397
359
    if make_paths_wt_relative and working_tree is not None:
398
 
        other_paths = working_tree.safe_relpath_files(
399
 
            other_paths,
 
360
        try:
 
361
            from bzrlib.builtins import safe_relpath_files
 
362
            other_paths = safe_relpath_files(working_tree, other_paths,
400
363
            apply_view=apply_view)
 
364
        except errors.FileInWrongBranch:
 
365
            raise errors.BzrCommandError("Files are in different branches")
401
366
    specific_files.extend(other_paths)
402
367
    if len(specific_files) == 0:
403
368
        specific_files = None
407
372
            if view_files:
408
373
                specific_files = view_files
409
374
                view_str = views.view_display_str(view_files)
410
 
                note(gettext("*** Ignoring files outside view. View is %s") % view_str)
 
375
                note("*** Ignoring files outside view. View is %s" % view_str)
411
376
 
412
377
    # Get extra trees that ought to be searched for file-ids
413
378
    extra_trees = None
414
379
    if working_tree is not None and working_tree not in (old_tree, new_tree):
415
380
        extra_trees = (working_tree,)
416
 
    return (old_tree, new_tree, old_branch, new_branch,
417
 
            specific_files, extra_trees)
418
 
 
 
381
    return old_tree, new_tree, specific_files, extra_trees
419
382
 
420
383
def _get_tree_to_diff(spec, tree=None, branch=None, basis_is_default=True):
421
384
    if branch is None and tree is not None:
436
399
                    old_label='a/', new_label='b/',
437
400
                    extra_trees=None,
438
401
                    path_encoding='utf8',
439
 
                    using=None,
440
 
                    format_cls=None,
441
 
                    context=DEFAULT_CONTEXT_AMOUNT):
 
402
                    using=None):
442
403
    """Show in text form the changes from one tree to another.
443
404
 
444
 
    :param to_file: The output stream.
445
 
    :param specific_files: Include only changes to these files - None for all
446
 
        changes.
447
 
    :param external_diff_options: If set, use an external GNU diff and pass 
448
 
        these options.
449
 
    :param extra_trees: If set, more Trees to use for looking up file ids
450
 
    :param path_encoding: If set, the path will be encoded as specified, 
451
 
        otherwise is supposed to be utf8
452
 
    :param format_cls: Formatter class (DiffTree subclass)
 
405
    to_file
 
406
        The output stream.
 
407
 
 
408
    specific_files
 
409
        Include only changes to these files - None for all changes.
 
410
 
 
411
    external_diff_options
 
412
        If set, use an external GNU diff and pass these options.
 
413
 
 
414
    extra_trees
 
415
        If set, more Trees to use for looking up file ids
 
416
 
 
417
    path_encoding
 
418
        If set, the path will be encoded as specified, otherwise is supposed
 
419
        to be utf8
453
420
    """
454
 
    if context is None:
455
 
        context = DEFAULT_CONTEXT_AMOUNT
456
 
    if format_cls is None:
457
 
        format_cls = DiffTree
458
 
    with old_tree.lock_read():
 
421
    old_tree.lock_read()
 
422
    try:
459
423
        if extra_trees is not None:
460
424
            for tree in extra_trees:
461
425
                tree.lock_read()
462
426
        new_tree.lock_read()
463
427
        try:
464
 
            differ = format_cls.from_trees_options(old_tree, new_tree, to_file,
465
 
                                                   path_encoding,
466
 
                                                   external_diff_options,
467
 
                                                   old_label, new_label, using,
468
 
                                                   context_lines=context)
 
428
            differ = DiffTree.from_trees_options(old_tree, new_tree, to_file,
 
429
                                                 path_encoding,
 
430
                                                 external_diff_options,
 
431
                                                 old_label, new_label, using)
469
432
            return differ.show_diff(specific_files, extra_trees)
470
433
        finally:
471
434
            new_tree.unlock()
472
435
            if extra_trees is not None:
473
436
                for tree in extra_trees:
474
437
                    tree.unlock()
 
438
    finally:
 
439
        old_tree.unlock()
475
440
 
476
441
 
477
442
def _patch_header_date(tree, file_id, path):
478
443
    """Returns a timestamp suitable for use in a patch header."""
479
 
    try:
480
 
        mtime = tree.get_file_mtime(path, file_id)
481
 
    except FileTimestampUnavailable:
482
 
        mtime = 0
 
444
    mtime = tree.get_file_mtime(file_id, path)
483
445
    return timestamp.format_patch_date(mtime)
484
446
 
485
447
 
486
448
def get_executable_change(old_is_x, new_is_x):
487
 
    descr = { True:b"+x", False:b"-x", None:b"??" }
 
449
    descr = { True:"+x", False:"-x", None:"??" }
488
450
    if old_is_x != new_is_x:
489
 
        return [b"%s to %s" % (descr[old_is_x], descr[new_is_x],)]
 
451
        return ["%s to %s" % (descr[old_is_x], descr[new_is_x],)]
490
452
    else:
491
453
        return []
492
454
 
597
559
        if 'symlink' not in (old_kind, new_kind):
598
560
            return self.CANNOT_DIFF
599
561
        if old_kind == 'symlink':
600
 
            old_target = self.old_tree.get_symlink_target(old_path, file_id)
 
562
            old_target = self.old_tree.get_symlink_target(file_id)
601
563
        elif old_kind is None:
602
564
            old_target = None
603
565
        else:
604
566
            return self.CANNOT_DIFF
605
567
        if new_kind == 'symlink':
606
 
            new_target = self.new_tree.get_symlink_target(new_path, file_id)
 
568
            new_target = self.new_tree.get_symlink_target(file_id)
607
569
        elif new_kind is None:
608
570
            new_target = None
609
571
        else:
612
574
 
613
575
    def diff_symlink(self, old_target, new_target):
614
576
        if old_target is None:
615
 
            self.to_file.write(b'=== target is \'%s\'\n' %
616
 
                new_target.encode(self.path_encoding, 'replace'))
 
577
            self.to_file.write('=== target is %r\n' % new_target)
617
578
        elif new_target is None:
618
 
            self.to_file.write(b'=== target was \'%s\'\n' %
619
 
                old_target.encode(self.path_encoding, 'replace'))
 
579
            self.to_file.write('=== target was %r\n' % old_target)
620
580
        else:
621
 
            self.to_file.write(b'=== target changed \'%s\' => \'%s\'\n' %
622
 
                              (old_target.encode(self.path_encoding, 'replace'),
623
 
                               new_target.encode(self.path_encoding, 'replace')))
 
581
            self.to_file.write('=== target changed %r => %r\n' %
 
582
                              (old_target, new_target))
624
583
        return self.CHANGED
625
584
 
626
585
 
630
589
    # or removed in a diff.
631
590
    EPOCH_DATE = '1970-01-01 00:00:00 +0000'
632
591
 
633
 
    def __init__(self, old_tree, new_tree, to_file, path_encoding='utf-8', 
634
 
                 old_label='', new_label='', text_differ=internal_diff, 
635
 
                 context_lines=DEFAULT_CONTEXT_AMOUNT):
 
592
    def __init__(self, old_tree, new_tree, to_file, path_encoding='utf-8',
 
593
                 old_label='', new_label='', text_differ=internal_diff):
636
594
        DiffPath.__init__(self, old_tree, new_tree, to_file, path_encoding)
637
595
        self.text_differ = text_differ
638
596
        self.old_label = old_label
639
597
        self.new_label = new_label
640
598
        self.path_encoding = path_encoding
641
 
        self.context_lines = context_lines
642
599
 
643
600
    def diff(self, file_id, old_path, new_path, old_kind, new_kind):
644
601
        """Compare two files in unified diff format
666
623
            to_file_id = None
667
624
        else:
668
625
            return self.CANNOT_DIFF
669
 
        from_label = '%s%s\t%s' % (self.old_label, old_path,
670
 
                old_date)
671
 
        to_label = '%s%s\t%s' % (self.new_label, new_path,
672
 
                new_date)
673
 
        return self.diff_text(old_path, new_path, from_label, to_label,
674
 
            from_file_id, to_file_id)
 
626
        from_label = '%s%s\t%s' % (self.old_label, old_path, old_date)
 
627
        to_label = '%s%s\t%s' % (self.new_label, new_path, new_date)
 
628
        return self.diff_text(from_file_id, to_file_id, from_label, to_label,
 
629
            old_path, new_path)
675
630
 
676
 
    def diff_text(self, from_path, to_path, from_label, to_label,
677
 
        from_file_id=None, to_file_id=None):
 
631
    def diff_text(self, from_file_id, to_file_id, from_label, to_label,
 
632
        from_path=None, to_path=None):
678
633
        """Diff the content of given files in two trees
679
634
 
680
 
        :param from_path: The path in the from tree. If None,
 
635
        :param from_file_id: The id of the file in the from tree.  If None,
681
636
            the file is not present in the from tree.
682
 
        :param to_path: The path in the to tree. This may refer
683
 
            to a different file from from_path.  If None,
 
637
        :param to_file_id: The id of the file in the to tree.  This may refer
 
638
            to a different file from from_file_id.  If None,
684
639
            the file is not present in the to tree.
685
 
        :param from_file_id: The id of the file in the from tree or None if
686
 
            unknown.
687
 
        :param to_file_id: The id of the file in the to tree or None if
688
 
            unknown.
 
640
        :param from_path: The path in the from tree or None if unknown.
 
641
        :param to_path: The path in the to tree or None if unknown.
689
642
        """
690
643
        def _get_text(tree, file_id, path):
691
 
            if file_id is None:
 
644
            if file_id is not None:
 
645
                return tree.get_file(file_id, path).readlines()
 
646
            else:
692
647
                return []
693
 
            return tree.get_file_lines(path, file_id)
694
648
        try:
695
649
            from_text = _get_text(self.old_tree, from_file_id, from_path)
696
650
            to_text = _get_text(self.new_tree, to_file_id, to_path)
697
651
            self.text_differ(from_label, from_text, to_label, to_text,
698
 
                             self.to_file, path_encoding=self.path_encoding,
699
 
                             context_lines=self.context_lines)
 
652
                             self.to_file)
700
653
        except errors.BinaryFile:
701
654
            self.to_file.write(
702
655
                  ("Binary files %s and %s differ\n" %
703
 
                  (from_label, to_label)).encode(self.path_encoding, 'replace'))
 
656
                  (from_label, to_label)).encode(self.path_encoding))
704
657
        return self.CHANGED
705
658
 
706
659
 
710
663
                 path_encoding='utf-8'):
711
664
        DiffPath.__init__(self, old_tree, new_tree, to_file, path_encoding)
712
665
        self.command_template = command_template
713
 
        self._root = osutils.mkdtemp(prefix='brz-diff-')
 
666
        self._root = osutils.mkdtemp(prefix='bzr-diff-')
714
667
 
715
668
    @classmethod
716
669
    def from_string(klass, command_string, old_tree, new_tree, to_file,
717
670
                    path_encoding='utf-8'):
718
 
        command_template = cmdline.split(command_string)
719
 
        if '@' not in command_string:
720
 
            command_template.extend(['@old_path', '@new_path'])
 
671
        command_template = commands.shlex_split_unicode(command_string)
 
672
        command_template.extend(['%(old_path)s', '%(new_path)s'])
721
673
        return klass(command_template, old_tree, new_tree, to_file,
722
674
                     path_encoding)
723
675
 
724
676
    @classmethod
725
 
    def make_from_diff_tree(klass, command_string, external_diff_options=None):
 
677
    def make_from_diff_tree(klass, command_string):
726
678
        def from_diff_tree(diff_tree):
727
 
            full_command_string = [command_string]
728
 
            if external_diff_options is not None:
729
 
                full_command_string += ' ' + external_diff_options
730
 
            return klass.from_string(full_command_string, diff_tree.old_tree,
 
679
            return klass.from_string(command_string, diff_tree.old_tree,
731
680
                                     diff_tree.new_tree, diff_tree.to_file)
732
681
        return from_diff_tree
733
682
 
734
683
    def _get_command(self, old_path, new_path):
735
684
        my_map = {'old_path': old_path, 'new_path': new_path}
736
 
        command = [AtTemplate(t).substitute(my_map) for t in
737
 
                   self.command_template]
738
 
        if sys.platform == 'win32': # Popen doesn't accept unicode on win32
739
 
            command_encoded = []
740
 
            for c in command:
741
 
                if isinstance(c, text_type):
742
 
                    command_encoded.append(c.encode('mbcs'))
743
 
                else:
744
 
                    command_encoded.append(c)
745
 
            return command_encoded
746
 
        else:
747
 
            return command
 
685
        return [t % my_map for t in self.command_template]
748
686
 
749
687
    def _execute(self, old_path, new_path):
750
688
        command = self._get_command(old_path, new_path)
751
689
        try:
752
690
            proc = subprocess.Popen(command, stdout=subprocess.PIPE,
753
691
                                    cwd=self._root)
754
 
        except OSError as e:
 
692
        except OSError, e:
755
693
            if e.errno == errno.ENOENT:
756
694
                raise errors.ExecutableMissing(command[0])
757
695
            else:
758
696
                raise
759
697
        self.to_file.write(proc.stdout.read())
760
 
        proc.stdout.close()
761
698
        return proc.wait()
762
699
 
763
700
    def _try_symlink_root(self, tree, prefix):
766
703
            return False
767
704
        try:
768
705
            os.symlink(tree.abspath(''), osutils.pathjoin(self._root, prefix))
769
 
        except OSError as e:
 
706
        except OSError, e:
770
707
            if e.errno != errno.EEXIST:
771
708
                raise
772
709
        return True
773
710
 
774
 
    @staticmethod
775
 
    def _fenc():
776
 
        """Returns safe encoding for passing file path to diff tool"""
777
 
        if sys.platform == 'win32':
778
 
            return 'mbcs'
779
 
        else:
780
 
            # Don't fallback to 'utf-8' because subprocess may not be able to
781
 
            # handle utf-8 correctly when locale is not utf-8.
782
 
            return sys.getfilesystemencoding() or 'ascii'
783
 
 
784
 
    def _is_safepath(self, path):
785
 
        """Return true if `path` may be able to pass to subprocess."""
786
 
        fenc = self._fenc()
787
 
        try:
788
 
            return path == path.encode(fenc).decode(fenc)
789
 
        except UnicodeError:
790
 
            return False
791
 
 
792
 
    def _safe_filename(self, prefix, relpath):
793
 
        """Replace unsafe character in `relpath` then join `self._root`,
794
 
        `prefix` and `relpath`."""
795
 
        fenc = self._fenc()
796
 
        # encoded_str.replace('?', '_') may break multibyte char.
797
 
        # So we should encode, decode, then replace(u'?', u'_')
798
 
        relpath_tmp = relpath.encode(fenc, 'replace').decode(fenc, 'replace')
799
 
        relpath_tmp = relpath_tmp.replace(u'?', u'_')
800
 
        return osutils.pathjoin(self._root, prefix, relpath_tmp)
801
 
 
802
 
    def _write_file(self, relpath, tree, prefix, force_temp=False,
803
 
                    allow_write=False, file_id=None):
804
 
        if not force_temp and isinstance(tree, WorkingTree):
805
 
            full_path = tree.abspath(relpath)
806
 
            if self._is_safepath(full_path):
807
 
                return full_path
808
 
 
809
 
        full_path = self._safe_filename(prefix, relpath)
810
 
        if not force_temp and self._try_symlink_root(tree, prefix):
 
711
    def _write_file(self, file_id, tree, prefix, relpath):
 
712
        full_path = osutils.pathjoin(self._root, prefix, relpath)
 
713
        if self._try_symlink_root(tree, prefix):
811
714
            return full_path
812
715
        parent_dir = osutils.dirname(full_path)
813
716
        try:
814
717
            os.makedirs(parent_dir)
815
 
        except OSError as e:
 
718
        except OSError, e:
816
719
            if e.errno != errno.EEXIST:
817
720
                raise
818
 
        source = tree.get_file(relpath, file_id)
 
721
        source = tree.get_file(file_id, relpath)
819
722
        try:
820
 
            with open(full_path, 'wb') as target:
 
723
            target = open(full_path, 'wb')
 
724
            try:
821
725
                osutils.pumpfile(source, target)
 
726
            finally:
 
727
                target.close()
822
728
        finally:
823
729
            source.close()
824
 
        try:
825
 
            mtime = tree.get_file_mtime(relpath, file_id)
826
 
        except FileTimestampUnavailable:
827
 
            pass
828
 
        else:
829
 
            os.utime(full_path, (mtime, mtime))
830
 
        if not allow_write:
831
 
            osutils.make_readonly(full_path)
 
730
        osutils.make_readonly(full_path)
 
731
        mtime = tree.get_file_mtime(file_id)
 
732
        os.utime(full_path, (mtime, mtime))
832
733
        return full_path
833
734
 
834
 
    def _prepare_files(self, old_path, new_path, force_temp=False,
835
 
                       allow_write_new=False, file_id=None):
836
 
        old_disk_path = self._write_file(old_path, self.old_tree, 'old',
837
 
                                         force_temp, file_id=file_id)
838
 
        new_disk_path = self._write_file(new_path, self.new_tree, 'new',
839
 
                                         force_temp, file_id=file_id,
840
 
                                         allow_write=allow_write_new)
 
735
    def _prepare_files(self, file_id, old_path, new_path):
 
736
        old_disk_path = self._write_file(file_id, self.old_tree, 'old',
 
737
                                         old_path)
 
738
        new_disk_path = self._write_file(file_id, self.new_tree, 'new',
 
739
                                         new_path)
841
740
        return old_disk_path, new_disk_path
842
741
 
843
742
    def finish(self):
844
743
        try:
845
744
            osutils.rmtree(self._root)
846
 
        except OSError as e:
 
745
        except OSError, e:
847
746
            if e.errno != errno.ENOENT:
848
747
                mutter("The temporary directory \"%s\" was not "
849
748
                        "cleanly removed: %s." % (self._root, e))
851
750
    def diff(self, file_id, old_path, new_path, old_kind, new_kind):
852
751
        if (old_kind, new_kind) != ('file', 'file'):
853
752
            return DiffPath.CANNOT_DIFF
854
 
        (old_disk_path, new_disk_path) = self._prepare_files(
855
 
                old_path, new_path, file_id=file_id)
856
 
        self._execute(old_disk_path, new_disk_path)
857
 
 
858
 
    def edit_file(self, old_path, new_path, file_id=None):
859
 
        """Use this tool to edit a file.
860
 
 
861
 
        A temporary copy will be edited, and the new contents will be
862
 
        returned.
863
 
 
864
 
        :param file_id: The id of the file to edit.
865
 
        :return: The new contents of the file.
866
 
        """
867
 
        old_abs_path, new_abs_path = self._prepare_files(
868
 
                old_path, new_path, allow_write_new=True, force_temp=True,
869
 
                file_id=file_id)
870
 
        command = self._get_command(old_abs_path, new_abs_path)
871
 
        subprocess.call(command, cwd=self._root)
872
 
        with open(new_abs_path, 'rb') as new_file:
873
 
            return new_file.read()
 
753
        self._prepare_files(file_id, old_path, new_path)
 
754
        self._execute(osutils.pathjoin('old', old_path),
 
755
                      osutils.pathjoin('new', new_path))
874
756
 
875
757
 
876
758
class DiffTree(object):
918
800
    @classmethod
919
801
    def from_trees_options(klass, old_tree, new_tree, to_file,
920
802
                           path_encoding, external_diff_options, old_label,
921
 
                           new_label, using, context_lines):
 
803
                           new_label, using):
922
804
        """Factory for producing a DiffTree.
923
805
 
924
806
        Designed to accept options used by show_diff_trees.
925
 
 
926
807
        :param old_tree: The tree to show as old in the comparison
927
808
        :param new_tree: The tree to show as new in the comparison
928
809
        :param to_file: File to write comparisons to
934
815
        :param using: Commandline to use to invoke an external diff tool
935
816
        """
936
817
        if using is not None:
937
 
            extra_factories = [DiffFromTool.make_from_diff_tree(using, external_diff_options)]
 
818
            extra_factories = [DiffFromTool.make_from_diff_tree(using)]
938
819
        else:
939
820
            extra_factories = []
940
821
        if external_diff_options:
941
822
            opts = external_diff_options.split()
942
 
            def diff_file(olab, olines, nlab, nlines, to_file, path_encoding=None, context_lines=None):
943
 
                """:param path_encoding: not used but required
944
 
                        to match the signature of internal_diff.
945
 
                """
 
823
            def diff_file(olab, olines, nlab, nlines, to_file):
946
824
                external_diff(olab, olines, nlab, nlines, to_file, opts)
947
825
        else:
948
826
            diff_file = internal_diff
949
827
        diff_text = DiffText(old_tree, new_tree, to_file, path_encoding,
950
 
                             old_label, new_label, diff_file, context_lines=context_lines)
 
828
                             old_label, new_label, diff_file)
951
829
        return klass(old_tree, new_tree, to_file, path_encoding, diff_text,
952
830
                     extra_factories)
953
831
 
954
832
    def show_diff(self, specific_files, extra_trees=None):
955
833
        """Write tree diff to self.to_file
956
834
 
957
 
        :param specific_files: the specific files to compare (recursive)
 
835
        :param sepecific_files: the specific files to compare (recursive)
958
836
        :param extra_trees: extra trees to use for mapping paths to file_ids
959
837
        """
960
838
        try:
997
875
            properties_changed.extend(get_executable_change(executable[0], executable[1]))
998
876
 
999
877
            if properties_changed:
1000
 
                prop_str = b" (properties changed: %s)" % (
1001
 
                        b", ".join(properties_changed),)
 
878
                prop_str = " (properties changed: %s)" % (", ".join(properties_changed),)
1002
879
            else:
1003
 
                prop_str = b""
 
880
                prop_str = ""
1004
881
 
1005
882
            if (old_present, new_present) == (True, False):
1006
 
                self.to_file.write(b"=== removed %s '%s'\n" %
1007
 
                                   (kind[0].encode('ascii'), oldpath_encoded))
 
883
                self.to_file.write("=== removed %s '%s'\n" %
 
884
                                   (kind[0], oldpath_encoded))
1008
885
                newpath = oldpath
1009
886
            elif (old_present, new_present) == (False, True):
1010
 
                self.to_file.write(b"=== added %s '%s'\n" %
1011
 
                                   (kind[1].encode('ascii'), newpath_encoded))
 
887
                self.to_file.write("=== added %s '%s'\n" %
 
888
                                   (kind[1], newpath_encoded))
1012
889
                oldpath = newpath
1013
890
            elif renamed:
1014
 
                self.to_file.write(b"=== renamed %s '%s' => '%s'%s\n" %
1015
 
                    (kind[0].encode('ascii'), oldpath_encoded, newpath_encoded, prop_str))
 
891
                self.to_file.write("=== renamed %s '%s' => '%s'%s\n" %
 
892
                    (kind[0], oldpath_encoded, newpath_encoded, prop_str))
1016
893
            else:
1017
894
                # if it was produced by iter_changes, it must be
1018
895
                # modified *somehow*, either content or execute bit.
1019
 
                self.to_file.write(b"=== modified %s '%s'%s\n" % (kind[0].encode('ascii'),
 
896
                self.to_file.write("=== modified %s '%s'%s\n" % (kind[0],
1020
897
                                   newpath_encoded, prop_str))
1021
898
            if changed_content:
1022
 
                self._diff(oldpath, newpath, kind[0], kind[1], file_id=file_id)
 
899
                self._diff(file_id, oldpath, newpath, kind[0], kind[1])
1023
900
                has_changes = 1
1024
901
            if renamed:
1025
902
                has_changes = 1
1032
909
        :param old_path: The path of the file in the old tree
1033
910
        :param new_path: The path of the file in the new tree
1034
911
        """
1035
 
        if old_path is None:
 
912
        try:
 
913
            old_kind = self.old_tree.kind(file_id)
 
914
        except (errors.NoSuchId, errors.NoSuchFile):
1036
915
            old_kind = None
1037
 
        else:
1038
 
            old_kind = self.old_tree.kind(old_path, file_id)
1039
 
        if new_path is None:
 
916
        try:
 
917
            new_kind = self.new_tree.kind(file_id)
 
918
        except (errors.NoSuchId, errors.NoSuchFile):
1040
919
            new_kind = None
1041
 
        else:
1042
 
            new_kind = self.new_tree.kind(new_path, file_id)
1043
 
        self._diff(old_path, new_path, old_kind, new_kind, file_id=file_id)
1044
 
 
1045
 
    def _diff(self, old_path, new_path, old_kind, new_kind, file_id):
 
920
        self._diff(file_id, old_path, new_path, old_kind, new_kind)
 
921
 
 
922
 
 
923
    def _diff(self, file_id, old_path, new_path, old_kind, new_kind):
1046
924
        result = DiffPath._diff_many(self.differs, file_id, old_path,
1047
 
                                     new_path, old_kind, new_kind)
 
925
                                       new_path, old_kind, new_kind)
1048
926
        if result is DiffPath.CANNOT_DIFF:
1049
927
            error_path = new_path
1050
928
            if error_path is None:
1051
929
                error_path = old_path
1052
930
            raise errors.NoDiffFound(error_path)
1053
 
 
1054
 
 
1055
 
format_registry = Registry()
1056
 
format_registry.register('default', DiffTree)