3
from subprocess import Popen, PIPE
5
from bzrlib.errors import NoDiff3
6
from bzrlib.textfile import check_text_path
4
8
Diff and patch functionality
6
10
__docformat__ = "restructuredtext"
12
def write_to_cmd(args, input=""):
14
process = Popen(args, bufsize=len(input), stdin=PIPE, stdout=PIPE,
15
stderr=PIPE, close_fds=True)
17
process = Popen(args, bufsize=len(input), stdin=PIPE, stdout=PIPE,
20
stdout, stderr = process.communicate(input)
21
status = process.wait()
23
raise Exception("%s killed by signal %i" (args[0], -status))
24
return stdout, stderr, status
8
27
def patch(patch_contents, filename, output_filename=None, reverse=False):
9
28
"""Apply a patch to a file, to produce another output file. This is should
10
29
be suitable for our limited purposes.
26
45
if output_filename is not None:
27
46
args.extend(("-o", output_filename))
28
47
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())
48
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
52
def diff3(out_file, mine_path, older_path, yours_path):
63
53
def add_label(args, label):
64
54
args.extend(("-L", label))
55
check_text_path(mine_path)
56
check_text_path(older_path)
57
check_text_path(yours_path)
65
58
args = ['diff3', "-E", "--merge"]
66
59
add_label(args, "TREE")
67
60
add_label(args, "ANCESTOR")
68
61
add_label(args, "MERGE-SOURCE")
69
62
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())
64
output, stderr, status = write_to_cmd(args)
66
if e.errno == errno.ENOENT:
74
70
if status not in (0, 1):
75
raise Exception(output)
71
raise Exception(stderr)
76
72
file(out_file, "wb").write(output)