94
94
if sequence_matcher is None:
95
95
sequence_matcher = patiencediff.PatienceSequenceMatcher
96
ud = patiencediff.unified_diff_bytes(oldlines, newlines,
97
fromfile=old_label.encode(
98
path_encoding, 'replace'),
99
tofile=new_label.encode(
100
path_encoding, 'replace'),
101
n=context_lines, sequencematcher=sequence_matcher)
96
ud = unified_diff_bytes(
98
fromfile=old_label.encode(path_encoding, 'replace'),
99
tofile=new_label.encode(path_encoding, 'replace'),
100
n=context_lines, sequencematcher=sequence_matcher)
104
103
if len(ud) == 0: # Identical contents, nothing to do
117
116
to_file.write(b'\n')
119
def unified_diff_bytes(a, b, fromfile=b'', tofile=b'', fromfiledate=b'',
120
tofiledate=b'', n=3, lineterm=b'\n', sequencematcher=None):
122
Compare two sequences of lines; generate the delta as a unified diff.
124
Unified diffs are a compact way of showing line changes and a few
125
lines of context. The number of context lines is set by 'n' which
128
By default, the diff control lines (those with ---, +++, or @@) are
129
created with a trailing newline. This is helpful so that inputs
130
created from file.readlines() result in diffs that are suitable for
131
file.writelines() since both the inputs and outputs have trailing
134
For inputs that do not have trailing newlines, set the lineterm
135
argument to "" so that the output will be uniformly newline free.
137
The unidiff format normally has a header for filenames and modification
138
times. Any or all of these may be specified using strings for
139
'fromfile', 'tofile', 'fromfiledate', and 'tofiledate'. The modification
140
times are normally expressed in the format returned by time.ctime().
144
>>> for line in bytes_unified_diff(b'one two three four'.split(),
145
... b'zero one tree four'.split(), b'Original', b'Current',
146
... b'Sat Jan 26 23:30:50 1991', b'Fri Jun 06 10:20:52 2003',
149
--- Original Sat Jan 26 23:30:50 1991
150
+++ Current Fri Jun 06 10:20:52 2003
159
if sequencematcher is None:
160
sequencematcher = difflib.SequenceMatcher
163
fromfiledate = b'\t' + bytes(fromfiledate)
165
tofiledate = b'\t' + bytes(tofiledate)
168
for group in sequencematcher(None, a, b).get_grouped_opcodes(n):
170
yield b'--- %s%s%s' % (fromfile, fromfiledate, lineterm)
171
yield b'+++ %s%s%s' % (tofile, tofiledate, lineterm)
173
i1, i2, j1, j2 = group[0][1], group[-1][2], group[0][3], group[-1][4]
174
yield b"@@ -%d,%d +%d,%d @@%s" % (i1 + 1, i2 - i1, j1 + 1, j2 - j1, lineterm)
175
for tag, i1, i2, j1, j2 in group:
177
for line in a[i1:i2]:
180
if tag == 'replace' or tag == 'delete':
181
for line in a[i1:i2]:
183
if tag == 'replace' or tag == 'insert':
184
for line in b[j1:j2]:
120
188
def _spawn_external_diff(diffcmd, capture_errors=True):
121
189
"""Spawn the external diff process, and return the child handle.