Created
February 7, 2013 14:53
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Convert hg patches to git patches. curl -L hg_patch | this-script | git am
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#!/usr/bin/env python | |
r'''Convert an hg-exported patch to a patch suitable for use by git am. | |
>>> hg_patch_to_git_patch(StringIO('# HG changeset patch\n# User Foo <foo@bar.com>\n# Node ID deadbeef\n# Parent cafebabe\nCommit\n\nMsg\n\ndiff -\ndiffdiff')) | |
From: Foo <foo@bar.com> | |
Subject: Commit | |
<BLANKLINE> | |
Msg | |
<BLANKLINE> | |
diff - | |
diffdiff | |
''' | |
from __future__ import print_function | |
import sys | |
from cStringIO import StringIO | |
def hg_patch_to_git_patch(hg_patch_file): | |
hg_patch = hg_patch_file.read().split('\n') | |
author = None | |
date = None # not currently used | |
for i in range(len(hg_patch)): | |
line = hg_patch[i] | |
if not line.startswith('#'): | |
break | |
if line.startswith('# User '): | |
author = line[len('# User '):] | |
if line.startswith('# Date '): | |
date = line[len('# Date '):] | |
commit_msg = [] | |
for i in range(i, len(hg_patch)): | |
line = hg_patch[i] | |
if line.startswith('diff -'): | |
break | |
commit_msg.append(hg_patch[i]) | |
if len(commit_msg) > 1 and not commit_msg[1].strip(): | |
del commit_msg[1] | |
# Remove blank lines at the end of the commit message. | |
while commit_msg and not commit_msg[-1].strip(): | |
del commit_msg[-1] | |
diff = hg_patch[i:] | |
if author: | |
# XXX ensure this has the Foo <foo@bar.com> form. | |
# XXX encoding crap. | |
print('From: %s' % author) | |
else: | |
print('From: unknown@unknown.com') | |
if commit_msg: | |
print('Subject: %s' % commit_msg[0]) | |
print() | |
print('\n'.join(commit_msg[1:])) | |
print() | |
print('\n'.join(diff)) | |
if __name__ == '__main__': | |
if len(sys.argv) > 1 and sys.argv[1] == '--test': | |
import doctest | |
doctest.testmod() | |
sys.exit(0) | |
if len(sys.argv) == 1: | |
file = sys.stdin | |
elif len(sys.argv) == 2: | |
file = open(sys.argv[1], 'r') | |
else: | |
print('Error: Specify one file, or pipe input on stdin.') | |
sys.exit(1) | |
hg_patch_to_git_patch(file) |
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