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import os
from subprocess import Popen, PIPE
"""
Diff and patch functionality
"""
__docformat__ = "restructuredtext"
def write_to_cmd(args, input=""):
process = Popen(args, bufsize=len(input), stdin=PIPE, stdout=PIPE,
stderr=PIPE, close_fds=True)
stdout, stderr = process.communicate(input)
status = process.wait()
if status < 0:
raise Exception("%s killed by signal %i" (args[0], -status))
return stdout, stderr, status
def patch(patch_contents, filename, output_filename=None, reverse=False):
"""Apply a patch to a file, to produce another output file. This is should
be suitable for our limited purposes.
:param patch_contents: The contents of the patch to apply
:type patch_contents: str
:param filename: the name of the file to apply the patch to
:type filename: str
:param output_filename: The filename to produce. If None, file is \
modified in-place
:type output_filename: str or NoneType
:param reverse: If true, apply the patch in reverse
:type reverse: bool
:return: 0 on success, 1 if some hunks failed
"""
args = ["patch", "-f", "-s", "--posix", "--binary"]
if reverse:
args.append("--reverse")
if output_filename is not None:
args.extend(("-o", output_filename))
args.append(filename)
stdout, stderr, status = write_to_cmd(args, patch_contents)
return status
def diff3(out_file, mine_path, older_path, yours_path):
def add_label(args, label):
args.extend(("-L", label))
args = ['diff3', "-E", "--merge"]
add_label(args, "TREE")
add_label(args, "ANCESTOR")
add_label(args, "MERGE-SOURCE")
args.extend((mine_path, older_path, yours_path))
output, stderr, status = write_to_cmd(args)
if status not in (0, 1):
raise Exception(stderr)
file(out_file, "wb").write(output)
return status
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