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  • Committer: Robert Collins
  • Date: 2006-05-04 10:36:13 UTC
  • mto: (1697.1.1 integration)
  • mto: This revision was merged to the branch mainline in revision 1701.
  • Revision ID: robertc@robertcollins.net-20060504103613-bf4d13f925aa8520
Extend LockableFiles to support break_lock() calls.

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bzrlib/diff.py
1
 
#! /usr/bin/env python
2
 
# -*- coding: UTF-8 -*-
 
1
# Copyright (C) 2004, 2005, 2006 Canonical Ltd.
3
2
 
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
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
17
16
 
 
17
from bzrlib.delta import compare_trees
 
18
from bzrlib.errors import BzrError
 
19
import bzrlib.errors as errors
 
20
from bzrlib.symbol_versioning import *
 
21
from bzrlib.textfile import check_text_lines
18
22
from bzrlib.trace import mutter
19
 
from bzrlib.errors import BzrError
20
 
from bzrlib.delta import compare_trees
21
23
 
22
24
# TODO: Rather than building a changeset object, we should probably
23
25
# invoke callbacks on an object.  That object can either accumulate a
24
26
# list, write them out directly, etc etc.
25
27
 
26
 
def internal_diff(old_label, oldlines, new_label, newlines, to_file):
 
28
def internal_diff(old_filename, oldlines, new_filename, newlines, to_file,
 
29
                  allow_binary=False):
27
30
    import difflib
28
31
    
29
32
    # FIXME: difflib is wrong if there is no trailing newline.
41
44
    # both sequences are empty.
42
45
    if not oldlines and not newlines:
43
46
        return
 
47
    
 
48
    if allow_binary is False:
 
49
        check_text_lines(oldlines)
 
50
        check_text_lines(newlines)
44
51
 
45
52
    ud = difflib.unified_diff(oldlines, newlines,
46
 
                              fromfile=old_label, tofile=new_label)
 
53
                              fromfile=old_filename+'\t', 
 
54
                              tofile=new_filename+'\t')
47
55
 
 
56
    ud = list(ud)
48
57
    # work-around for difflib being too smart for its own good
49
58
    # if /dev/null is "1,0", patch won't recognize it as /dev/null
50
59
    if not oldlines:
51
 
        ud = list(ud)
52
60
        ud[2] = ud[2].replace('-1,0', '-0,0')
53
61
    elif not newlines:
54
 
        ud = list(ud)
55
62
        ud[2] = ud[2].replace('+1,0', '+0,0')
 
63
    # work around for difflib emitting random spaces after the label
 
64
    ud[0] = ud[0][:-2] + '\n'
 
65
    ud[1] = ud[1][:-2] + '\n'
56
66
 
57
67
    for line in ud:
58
68
        to_file.write(line)
61
71
    print >>to_file
62
72
 
63
73
 
64
 
 
65
 
 
66
 
def external_diff(old_label, oldlines, new_label, newlines, to_file,
 
74
def external_diff(old_filename, oldlines, new_filename, newlines, to_file,
67
75
                  diff_opts):
68
76
    """Display a diff by calling out to the external diff program."""
69
77
    import sys
98
106
        if not diff_opts:
99
107
            diff_opts = []
100
108
        diffcmd = ['diff',
101
 
                   '--label', old_label,
 
109
                   '--label', old_filename+'\t',
102
110
                   oldtmpf.name,
103
 
                   '--label', new_label,
 
111
                   '--label', new_filename+'\t',
104
112
                   newtmpf.name]
105
113
 
106
114
        # diff only allows one style to be specified; they don't override.
140
148
    finally:
141
149
        oldtmpf.close()                 # and delete
142
150
        newtmpf.close()
143
 
    
144
 
 
145
 
 
146
 
def show_diff(b, revision, specific_files, external_diff_options=None):
 
151
 
 
152
 
 
153
@deprecated_function(zero_eight)
 
154
def show_diff(b, from_spec, specific_files, external_diff_options=None,
 
155
              revision2=None, output=None, b2=None):
147
156
    """Shortcut for showing the diff to the working tree.
148
157
 
 
158
    Please use show_diff_trees instead.
 
159
 
149
160
    b
150
161
        Branch.
151
162
 
152
163
    revision
153
 
        None for each, or otherwise the old revision to compare against.
 
164
        None for 'basis tree', or otherwise the old revision to compare against.
 
165
    
 
166
    The more general form is show_diff_trees(), where the caller
 
167
    supplies any two trees.
 
168
    """
 
169
    if output is None:
 
170
        import sys
 
171
        output = sys.stdout
 
172
 
 
173
    if from_spec is None:
 
174
        old_tree = b.bzrdir.open_workingtree()
 
175
        if b2 is None:
 
176
            old_tree = old_tree = old_tree.basis_tree()
 
177
    else:
 
178
        old_tree = b.repository.revision_tree(from_spec.in_history(b).rev_id)
 
179
 
 
180
    if revision2 is None:
 
181
        if b2 is None:
 
182
            new_tree = b.bzrdir.open_workingtree()
 
183
        else:
 
184
            new_tree = b2.bzrdir.open_workingtree()
 
185
    else:
 
186
        new_tree = b.repository.revision_tree(revision2.in_history(b).rev_id)
 
187
 
 
188
    return show_diff_trees(old_tree, new_tree, output, specific_files,
 
189
                           external_diff_options)
 
190
 
 
191
 
 
192
def diff_cmd_helper(tree, specific_files, external_diff_options, 
 
193
                    old_revision_spec=None, new_revision_spec=None):
 
194
    """Helper for cmd_diff.
 
195
 
 
196
   tree 
 
197
        A WorkingTree
 
198
 
 
199
    specific_files
 
200
        The specific files to compare, or None
 
201
 
 
202
    external_diff_options
 
203
        If non-None, run an external diff, and pass it these options
 
204
 
 
205
    old_revision_spec
 
206
        If None, use basis tree as old revision, otherwise use the tree for
 
207
        the specified revision. 
 
208
 
 
209
    new_revision_spec
 
210
        If None, use working tree as new revision, otherwise use the tree for
 
211
        the specified revision.
154
212
    
155
213
    The more general form is show_diff_trees(), where the caller
156
214
    supplies any two trees.
157
215
    """
158
216
    import sys
159
 
 
160
 
    if revision == None:
161
 
        old_tree = b.basis_tree()
162
 
    else:
163
 
        old_tree = b.revision_tree(b.lookup_revision(revision))
164
 
        
165
 
    new_tree = b.working_tree()
166
 
 
167
 
    show_diff_trees(old_tree, new_tree, sys.stdout, specific_files,
168
 
                    external_diff_options)
169
 
 
 
217
    output = sys.stdout
 
218
    def spec_tree(spec):
 
219
        revision_id = spec.in_store(tree.branch).rev_id
 
220
        return tree.branch.repository.revision_tree(revision_id)
 
221
    if old_revision_spec is None:
 
222
        old_tree = tree.basis_tree()
 
223
    else:
 
224
        old_tree = spec_tree(old_revision_spec)
 
225
 
 
226
    if new_revision_spec is None:
 
227
        new_tree = tree
 
228
    else:
 
229
        new_tree = spec_tree(new_revision_spec)
 
230
 
 
231
    return show_diff_trees(old_tree, new_tree, sys.stdout, specific_files,
 
232
                           external_diff_options)
170
233
 
171
234
 
172
235
def show_diff_trees(old_tree, new_tree, to_file, specific_files=None,
179
242
    external_diff_options
180
243
        If set, use an external GNU diff and pass these options.
181
244
    """
182
 
 
183
 
    # TODO: Options to control putting on a prefix or suffix, perhaps as a format string
184
 
    old_label = ''
185
 
    new_label = ''
 
245
    old_tree.lock_read()
 
246
    try:
 
247
        new_tree.lock_read()
 
248
        try:
 
249
            return _show_diff_trees(old_tree, new_tree, to_file,
 
250
                                    specific_files, external_diff_options)
 
251
        finally:
 
252
            new_tree.unlock()
 
253
    finally:
 
254
        old_tree.unlock()
 
255
 
 
256
 
 
257
def _show_diff_trees(old_tree, new_tree, to_file,
 
258
                     specific_files, external_diff_options):
 
259
 
 
260
    # TODO: Options to control putting on a prefix or suffix, perhaps
 
261
    # as a format string?
 
262
    old_label = 'a/'
 
263
    new_label = 'b/'
186
264
 
187
265
    DEVNULL = '/dev/null'
188
266
    # Windows users, don't panic about this filename -- it is a
192
270
    # TODO: Generation of pseudo-diffs for added/deleted files could
193
271
    # be usefully made into a much faster special case.
194
272
 
 
273
    _raise_if_doubly_unversioned(specific_files, old_tree, new_tree)
 
274
 
195
275
    if external_diff_options:
196
276
        assert isinstance(external_diff_options, basestring)
197
277
        opts = external_diff_options.split()
200
280
    else:
201
281
        diff_file = internal_diff
202
282
    
203
 
 
204
283
    delta = compare_trees(old_tree, new_tree, want_unchanged=False,
205
284
                          specific_files=specific_files)
206
285
 
 
286
    has_changes = 0
207
287
    for path, file_id, kind in delta.removed:
208
 
        print >>to_file, '*** removed %s %r' % (kind, path)
209
 
        if kind == 'file':
210
 
            diff_file(old_label + path,
211
 
                      old_tree.get_file(file_id).readlines(),
212
 
                      DEVNULL, 
213
 
                      [],
214
 
                      to_file)
215
 
 
 
288
        has_changes = 1
 
289
        print >>to_file, '=== removed %s %r' % (kind, old_label + path)
 
290
        old_tree.inventory[file_id].diff(diff_file, old_label + path, old_tree,
 
291
                                         DEVNULL, None, None, to_file)
216
292
    for path, file_id, kind in delta.added:
217
 
        print >>to_file, '*** added %s %r' % (kind, path)
218
 
        if kind == 'file':
219
 
            diff_file(DEVNULL,
220
 
                      [],
221
 
                      new_label + path,
222
 
                      new_tree.get_file(file_id).readlines(),
223
 
                      to_file)
224
 
 
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)
 
293
        has_changes = 1
 
294
        print >>to_file, '=== added %s %r' % (kind, new_label + path)
 
295
        new_tree.inventory[file_id].diff(diff_file, new_label + path, new_tree,
 
296
                                         DEVNULL, None, None, to_file, 
 
297
                                         reverse=True)
 
298
    for (old_path, new_path, file_id, kind,
 
299
         text_modified, meta_modified) in delta.renamed:
 
300
        has_changes = 1
 
301
        prop_str = get_prop_change(meta_modified)
 
302
        print >>to_file, '=== renamed %s %r => %r%s' % (
 
303
                    kind, old_label + old_path, new_label + new_path, prop_str)
 
304
        _maybe_diff_file_or_symlink(old_label, old_path, old_tree, file_id,
 
305
                                    new_label, new_path, new_tree,
 
306
                                    text_modified, kind, to_file, diff_file)
 
307
    for path, file_id, kind, text_modified, meta_modified in delta.modified:
 
308
        has_changes = 1
 
309
        prop_str = get_prop_change(meta_modified)
 
310
        print >>to_file, '=== modified %s %r%s' % (kind, old_label + path,
 
311
                    prop_str)
227
312
        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(),
232
 
                      to_file)
233
 
 
234
 
    for path, file_id, kind in delta.modified:
235
 
        print >>to_file, '*** modified %s %r' % (kind, path)
236
 
        if kind == 'file':
237
 
            diff_file(old_label + path,
238
 
                      old_tree.get_file(file_id).readlines(),
239
 
                      new_label + path,
240
 
                      new_tree.get_file(file_id).readlines(),
241
 
                      to_file)
242
 
 
243
 
 
244
 
 
245
 
 
246
 
 
 
313
            _maybe_diff_file_or_symlink(old_label, path, old_tree, file_id,
 
314
                                        new_label, path, new_tree,
 
315
                                        True, kind, to_file, diff_file)
 
316
 
 
317
    return has_changes
 
318
 
 
319
 
 
320
def _raise_if_doubly_unversioned(specific_files, old_tree, new_tree):
 
321
    """Complain if paths are not versioned in either tree."""
 
322
    if not specific_files:
 
323
        return
 
324
    old_unversioned = old_tree.filter_unversioned_files(specific_files)
 
325
    new_unversioned = new_tree.filter_unversioned_files(specific_files)
 
326
    unversioned = old_unversioned.intersection(new_unversioned)
 
327
    if unversioned:
 
328
        raise errors.PathsNotVersionedError(sorted(unversioned))
 
329
    
 
330
 
 
331
def _raise_if_nonexistent(paths, old_tree, new_tree):
 
332
    """Complain if paths are not in either inventory or tree.
 
333
 
 
334
    It's OK with the files exist in either tree's inventory, or 
 
335
    if they exist in the tree but are not versioned.
 
336
    
 
337
    This can be used by operations such as bzr status that can accept
 
338
    unknown or ignored files.
 
339
    """
 
340
    mutter("check paths: %r", paths)
 
341
    if not paths:
 
342
        return
 
343
    s = old_tree.filter_unversioned_files(paths)
 
344
    s = new_tree.filter_unversioned_files(s)
 
345
    s = [path for path in s if not new_tree.has_filename(path)]
 
346
    if s:
 
347
        raise errors.PathsDoNotExist(sorted(s))
 
348
 
 
349
 
 
350
def get_prop_change(meta_modified):
 
351
    if meta_modified:
 
352
        return " (properties changed)"
 
353
    else:
 
354
        return  ""
 
355
 
 
356
 
 
357
def _maybe_diff_file_or_symlink(old_label, old_path, old_tree, file_id,
 
358
                                new_label, new_path, new_tree, text_modified,
 
359
                                kind, to_file, diff_file):
 
360
    if text_modified:
 
361
        new_entry = new_tree.inventory[file_id]
 
362
        old_tree.inventory[file_id].diff(diff_file,
 
363
                                         old_label + old_path, old_tree,
 
364
                                         new_label + new_path, new_entry, 
 
365
                                         new_tree, to_file)