1
# -*- coding: UTF-8 -*-
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
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_filename, oldlines, new_filename, 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_filename+'\t',
46
tofile=new_filename+'\t')
49
# work-around for difflib being too smart for its own good
50
# if /dev/null is "1,0", patch won't recognize it as /dev/null
52
ud[2] = ud[2].replace('-1,0', '-0,0')
54
ud[2] = ud[2].replace('+1,0', '+0,0')
55
# work around for difflib emitting random spaces after the label
56
ud[0] = ud[0][:-2] + '\n'
57
ud[1] = ud[1][:-2] + '\n'
61
if not line.endswith('\n'):
62
to_file.write("\n\\ No newline at end of file\n")
66
def external_diff(old_filename, oldlines, new_filename, newlines, to_file,
68
"""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
# make sure our own output is properly ordered before the diff
78
from tempfile import NamedTemporaryFile
81
oldtmpf = NamedTemporaryFile()
82
newtmpf = NamedTemporaryFile()
85
# TODO: perhaps a special case for comparing to or from the empty
86
# sequence; can just use /dev/null on Unix
88
# TODO: if either of the files being compared already exists as a
89
# regular named file (e.g. in the working directory) then we can
90
# compare directly to that, rather than copying it.
92
oldtmpf.writelines(oldlines)
93
newtmpf.writelines(newlines)
101
'--label', old_filename+'\t',
103
'--label', new_filename+'\t',
106
# diff only allows one style to be specified; they don't override.
107
# note that some of these take optargs, and the optargs can be
108
# directly appended to the options.
109
# this is only an approximate parser; it doesn't properly understand
111
for s in ['-c', '-u', '-C', '-U',
116
'-y', '--side-by-side',
128
diffcmd.extend(diff_opts)
130
rc = os.spawnvp(os.P_WAIT, 'diff', diffcmd)
132
if rc != 0 and rc != 1:
133
# returns 1 if files differ; that's OK
135
msg = 'signal %d' % (-rc)
137
msg = 'exit code %d' % rc
139
raise BzrError('external diff failed with %s; command: %r' % (rc, diffcmd))
141
oldtmpf.close() # and delete
144
def show_diff(b, from_spec, specific_files, external_diff_options=None,
145
revision2=None, output=None, b2=None):
146
"""Shortcut for showing the diff to the working tree.
152
None for 'basis tree', or otherwise the old revision to compare against.
154
The more general form is show_diff_trees(), where the caller
155
supplies any two trees.
161
if from_spec is None:
163
old_tree = b.basis_tree()
165
old_tree = b.working_tree()
167
old_tree = b.revision_tree(from_spec.in_history(b).rev_id)
169
if revision2 is None:
171
new_tree = b.working_tree()
173
new_tree = b2.working_tree()
175
new_tree = b.revision_tree(revision2.in_history(b).rev_id)
177
return show_diff_trees(old_tree, new_tree, output, specific_files,
178
external_diff_options)
182
def show_diff_trees(old_tree, new_tree, to_file, specific_files=None,
183
external_diff_options=None):
184
"""Show in text form the changes from one tree to another.
187
If set, include only changes to these files.
189
external_diff_options
190
If set, use an external GNU diff and pass these options.
193
# TODO: Options to control putting on a prefix or suffix, perhaps as a format string
197
DEVNULL = '/dev/null'
198
# Windows users, don't panic about this filename -- it is a
199
# special signal to GNU patch that the file should be created or
200
# deleted respectively.
202
# TODO: Generation of pseudo-diffs for added/deleted files could
203
# be usefully made into a much faster special case.
205
if external_diff_options:
206
assert isinstance(external_diff_options, basestring)
207
opts = external_diff_options.split()
208
def diff_file(olab, olines, nlab, nlines, to_file):
209
external_diff(olab, olines, nlab, nlines, to_file, opts)
211
diff_file = internal_diff
214
delta = compare_trees(old_tree, new_tree, want_unchanged=False,
215
specific_files=specific_files)
218
for path, file_id, kind in delta.removed:
220
print >>to_file, '=== removed %s %r' % (kind, path)
221
old_tree.inventory[file_id].diff(diff_file, old_label + path, old_tree,
222
DEVNULL, None, None, to_file)
223
for path, file_id, kind in delta.added:
225
print >>to_file, '=== added %s %r' % (kind, path)
226
new_tree.inventory[file_id].diff(diff_file, new_label + path, new_tree,
227
DEVNULL, None, None, to_file,
229
for (old_path, new_path, file_id, kind,
230
text_modified, meta_modified) in delta.renamed:
232
prop_str = get_prop_change(meta_modified)
233
print >>to_file, '=== renamed %s %r => %r%s' % (
234
kind, old_path, new_path, prop_str)
235
_maybe_diff_file_or_symlink(old_label, old_path, old_tree, file_id,
236
new_label, new_path, new_tree,
237
text_modified, kind, to_file, diff_file)
238
for path, file_id, kind, text_modified, meta_modified in delta.modified:
240
prop_str = get_prop_change(meta_modified)
241
print >>to_file, '=== modified %s %r%s' % (kind, path, prop_str)
243
_maybe_diff_file_or_symlink(old_label, path, old_tree, file_id,
244
new_label, path, new_tree,
245
True, kind, to_file, diff_file)
249
def get_prop_change(meta_modified):
251
return " (properties changed)"
256
def _maybe_diff_file_or_symlink(old_label, old_path, old_tree, file_id,
257
new_label, new_path, new_tree, text_modified,
258
kind, to_file, diff_file):
260
new_entry = new_tree.inventory[file_id]
261
old_tree.inventory[file_id].diff(diff_file,
262
old_label + old_path, old_tree,
263
new_label + new_path, new_entry,
added
removed
bzrlib/diff.py
