14
15
# along with this program; if not, write to the Free Software
15
16
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17
from bzrlib.trace import mutter
18
from bzrlib.errors import BzrError
19
from bzrlib.delta import compare_trees
21
# TODO: Rather than building a changeset object, we should probably
22
# invoke callbacks on an object. That object can either accumulate a
23
# list, write them out directly, etc etc.
25
def internal_diff(old_label, oldlines, new_label, newlines, to_file):
28
# FIXME: difflib is wrong if there is no trailing newline.
29
# The syntax used by patch seems to be "\ No newline at
30
# end of file" following the last diff line from that
31
# file. This is not trivial to insert into the
32
# unified_diff output and it might be better to just fix
33
# or replace that function.
35
# In the meantime we at least make sure the patch isn't
39
# Special workaround for Python2.3, where difflib fails if
40
# both sequences are empty.
41
if not oldlines and not newlines:
44
ud = difflib.unified_diff(oldlines, newlines,
45
fromfile=old_label, tofile=new_label)
48
# work-around for difflib being too smart for its own good
49
# if /dev/null is "1,0", patch won't recognize it as /dev/null
51
ud[2] = ud[2].replace('-1,0', '-0,0')
53
ud[2] = ud[2].replace('+1,0', '+0,0')
54
# work around for difflib emitting random spaces after the label
55
ud[0] = ud[0][:-2] + '\n'
56
ud[1] = ud[1][:-2] + '\n'
60
if not line.endswith('\n'):
61
to_file.write("\n\\ No newline at end of file\n")
65
def external_diff(old_label, oldlines, new_label, newlines, to_file,
67
"""Display a diff by calling out to the external diff program."""
70
if to_file != sys.stdout:
71
raise NotImplementedError("sorry, can't send external diff other than to stdout yet",
74
# make sure our own output is properly ordered before the diff
77
from tempfile import NamedTemporaryFile
80
oldtmpf = NamedTemporaryFile()
81
newtmpf = NamedTemporaryFile()
84
# TODO: perhaps a special case for comparing to or from the empty
85
# sequence; can just use /dev/null on Unix
87
# TODO: if either of the files being compared already exists as a
88
# regular named file (e.g. in the working directory) then we can
89
# compare directly to that, rather than copying it.
91
oldtmpf.writelines(oldlines)
92
newtmpf.writelines(newlines)
100
'--label', old_label,
102
'--label', new_label,
105
# diff only allows one style to be specified; they don't override.
106
# note that some of these take optargs, and the optargs can be
107
# directly appended to the options.
108
# this is only an approximate parser; it doesn't properly understand
110
for s in ['-c', '-u', '-C', '-U',
115
'-y', '--side-by-side',
127
diffcmd.extend(diff_opts)
129
rc = os.spawnvp(os.P_WAIT, 'diff', diffcmd)
131
if rc != 0 and rc != 1:
132
# returns 1 if files differ; that's OK
134
msg = 'signal %d' % (-rc)
136
msg = 'exit code %d' % rc
138
raise BzrError('external diff failed with %s; command: %r' % (rc, diffcmd))
140
oldtmpf.close() # and delete
143
def show_diff(b, revision, specific_files, external_diff_options=None,
144
revision2=None, output=None):
145
"""Shortcut for showing the diff to the working tree.
151
None for each, or otherwise the old revision to compare against.
153
The more general form is show_diff_trees(), where the caller
154
supplies any two trees.
161
old_tree = b.basis_tree()
163
old_tree = b.revision_tree(revision.in_history(b).rev_id)
165
if revision2 is None:
166
new_tree = b.working_tree()
168
new_tree = b.revision_tree(revision2.in_history(b).rev_id)
170
show_diff_trees(old_tree, new_tree, output, specific_files,
171
external_diff_options)
175
def show_diff_trees(old_tree, new_tree, to_file, specific_files=None,
176
external_diff_options=None):
177
"""Show in text form the changes from one tree to another.
180
If set, include only changes to these files.
182
external_diff_options
183
If set, use an external GNU diff and pass these options.
186
# TODO: Options to control putting on a prefix or suffix, perhaps as a format string
190
DEVNULL = '/dev/null'
191
# Windows users, don't panic about this filename -- it is a
192
# special signal to GNU patch that the file should be created or
193
# deleted respectively.
195
# TODO: Generation of pseudo-diffs for added/deleted files could
196
# be usefully made into a much faster special case.
198
if external_diff_options:
199
assert isinstance(external_diff_options, basestring)
200
opts = external_diff_options.split()
201
def diff_file(olab, olines, nlab, nlines, to_file):
202
external_diff(olab, olines, nlab, nlines, to_file, opts)
204
diff_file = internal_diff
207
delta = compare_trees(old_tree, new_tree, want_unchanged=False,
208
specific_files=specific_files)
210
for path, file_id, kind in delta.removed:
211
print >>to_file, '=== removed %s %r' % (kind, path)
212
old_tree.inventory[file_id].diff(diff_file, old_label + path, old_tree,
213
DEVNULL, None, None, to_file)
214
for path, file_id, kind in delta.added:
215
print >>to_file, '=== added %s %r' % (kind, path)
216
new_tree.inventory[file_id].diff(diff_file, new_label + path, new_tree,
217
DEVNULL, None, None, to_file,
219
for (old_path, new_path, file_id, kind,
220
text_modified, meta_modified) in delta.renamed:
221
prop_str = get_prop_change(meta_modified)
222
print >>to_file, '=== renamed %s %r => %r%s' % (
223
kind, old_path, new_path, prop_str)
224
_maybe_diff_file_or_symlink(old_label, old_path, old_tree, file_id,
225
new_label, new_path, new_tree,
226
text_modified, kind, to_file, diff_file)
227
for path, file_id, kind, text_modified, meta_modified in delta.modified:
228
prop_str = get_prop_change(meta_modified)
229
print >>to_file, '=== modified %s %r%s' % (kind, path, prop_str)
231
_maybe_diff_file_or_symlink(old_label, path, old_tree, file_id,
232
new_label, path, new_tree,
233
True, kind, to_file, diff_file)
236
def get_prop_change(meta_modified):
238
return " (properties changed)"
243
def _maybe_diff_file_or_symlink(old_label, old_path, old_tree, file_id,
244
new_label, new_path, new_tree, text_modified,
245
kind, to_file, diff_file):
247
new_entry = new_tree.inventory[file_id]
248
old_tree.inventory[file_id].diff(diff_file,
249
old_label + old_path, old_tree,
250
new_label + new_path, new_entry,
20
from trace import mutter
27
def diff_trees(old_tree, new_tree):
28
"""Compute diff between two trees.
30
They may be in different branches and may be working or historical
33
Yields a sequence of (state, id, old_name, new_name, kind).
34
Each filename and each id is listed only once.
37
## TODO: Compare files before diffing; only mention those that have changed
39
## TODO: Set nice names in the headers, maybe include diffstat
41
## TODO: Perhaps make this a generator rather than using
44
## TODO: Allow specifying a list of files to compare, rather than
45
## doing the whole tree? (Not urgent.)
47
## TODO: Allow diffing any two inventories, not just the
48
## current one against one. We mgiht need to specify two
49
## stores to look for the files if diffing two branches. That
50
## might imply this shouldn't be primarily a Branch method.
52
## XXX: This doesn't report on unknown files; that can be done
53
## from a separate method.
55
old_it = old_tree.list_files()
56
new_it = new_tree.list_files()
64
old_item = next(old_it)
65
new_item = next(new_it)
67
# We step through the two sorted iterators in parallel, trying to
70
while (old_item != None) or (new_item != None):
71
# OK, we still have some remaining on both, but they may be
74
old_name, old_class, old_kind, old_id = old_item
79
new_name, new_class, new_kind, new_id = new_item
83
mutter(" diff pairwise %r" % (old_item,))
84
mutter(" %r" % (new_item,))
87
# can't handle the old tree being a WorkingTree
88
assert old_class == 'V'
90
if new_item and (new_class != 'V'):
91
yield new_class, None, None, new_name, new_kind
92
new_item = next(new_it)
93
elif (not new_item) or (old_item and (old_name < new_name)):
94
mutter(" extra entry in old-tree sequence")
95
if new_tree.has_id(old_id):
96
# will be mentioned as renamed under new name
99
yield 'D', old_id, old_name, None, old_kind
100
old_item = next(old_it)
101
elif (not old_item) or (new_item and (new_name < old_name)):
102
mutter(" extra entry in new-tree sequence")
103
if old_tree.has_id(new_id):
104
yield 'R', new_id, old_tree.id2path(new_id), new_name, new_kind
106
yield 'A', new_id, None, new_name, new_kind
107
new_item = next(new_it)
108
elif old_id != new_id:
109
assert old_name == new_name
110
# both trees have a file of this name, but it is not the
111
# same file. in other words, the old filename has been
112
# overwritten by either a newly-added or a renamed file.
113
# (should we return something about the overwritten file?)
114
if old_tree.has_id(new_id):
115
# renaming, overlying a deleted file
116
yield 'R', new_id, old_tree.id2path(new_id), new_name, new_kind
118
yield 'A', new_id, None, new_name, new_kind
120
new_item = next(new_it)
121
old_item = next(old_it)
123
assert old_id == new_id
124
assert old_name == new_name
125
assert old_kind == new_kind
127
if old_kind == 'directory':
128
yield '.', new_id, old_name, new_name, new_kind
129
elif old_tree.get_file_size(old_id) != new_tree.get_file_size(old_id):
130
mutter(" file size has changed, must be different")
131
yield 'M', new_id, old_name, new_name, new_kind
132
elif old_tree.get_file_sha1(old_id) == new_tree.get_file_sha1(old_id):
133
mutter(" SHA1 indicates they're identical")
134
## assert compare_files(old_tree.get_file(i), new_tree.get_file(i))
135
yield '.', new_id, old_name, new_name, new_kind
137
mutter(" quick compare shows different")
138
yield 'M', new_id, old_name, new_name, new_kind
140
new_item = next(new_it)
141
old_item = next(old_it)
added
removed
bzrlib/diff.py
