2
from subprocess import Popen, PIPE
4
4
Diff and patch functionality
6
6
__docformat__ = "restructuredtext"
8
def write_to_cmd(args, input=""):
9
process = Popen(args, bufsize=len(input), stdin=PIPE, stdout=PIPE,
10
stderr=PIPE, close_fds=True)
11
stdout, stderr = process.communicate(input)
12
status = process.wait()
14
raise Exception("%s killed by signal %i" (args[0], -status))
15
return stdout, stderr, status
8
18
def patch(patch_contents, filename, output_filename=None, reverse=False):
9
19
"""Apply a patch to a file, to produce another output file. This is should
10
20
be suitable for our limited purposes.
26
36
if output_filename is not None:
27
37
args.extend(("-o", output_filename))
28
38
args.append(filename)
29
process = popen2.Popen3(args, bufsize=len(patch_contents))
30
process.tochild.write(patch_contents)
31
process.tochild.close()
32
status = os.WEXITSTATUS(process.wait())
39
stdout, stderr, status = write_to_cmd(args, patch_contents)
36
def diff(orig_file, mod_str, orig_label=None, mod_label=None):
37
"""Compare two files, and produce a patch.
39
:param orig_file: path to the old file
41
:param mod_str: Contents of the new file
43
:param orig_label: The label to use for the old file
45
:param mod_label: The label to use for the new file
48
args = ["diff", "-u" ]
49
if orig_label is not None and mod_label is not None:
50
args.extend(("-L", orig_label, "-L", mod_label))
51
args.extend(("--", orig_file, "-"))
52
process = popen2.Popen3(args, bufsize=len(mod_str))
53
process.tochild.write(mod_str)
54
process.tochild.close()
55
patch = process.fromchild.read()
56
status = os.WEXITSTATUS(process.wait())
62
43
def diff3(out_file, mine_path, older_path, yours_path):
63
44
def add_label(args, label):
64
45
args.extend(("-L", label))
67
48
add_label(args, "ANCESTOR")
68
49
add_label(args, "MERGE-SOURCE")
69
50
args.extend((mine_path, older_path, yours_path))
70
process = popen2.Popen4(args)
71
process.tochild.close()
72
output = process.fromchild.read()
73
status = os.WEXITSTATUS(process.wait())
51
output, stderr, status = write_to_cmd(args)
74
52
if status not in (0, 1):
75
raise Exception(output)
53
raise Exception(stderr)
76
54
file(out_file, "wb").write(output)