#!/usr/bin/env python

# encoding: utf-8

"""

git-external-chdiff

Created by Dan Weeks (dan [AT] danimal [DOT] org) on 2008-02-27.

Released to the Public Domain.

"""

import sys

import subprocess

import os

help_message = '''

git-external-chdiff [old-file] [new-file]

display diffs of git files using the chdiff utility

as a proxy for GIT_EXTERNAL_DIFF via git

'''

def main(argv=None):

"""

the basic work location

"""

# set up the defaults

wait = True

verbose = False

# pull the file names from the args passed in via git

oldFile = sys.argv[2]

newFile = sys.argv[5]

try:

waitFlag = ''

if wait:

waitFlag = '--wait'

if verbose:

print 'git-external-chdiff: comparing %s %s' % (oldFile, newFile)

p = subprocess.Popen('chdiff %s %s %s' % (waitFlag,

oldFile,

newFile),

env=os.environ,

shell=True,

stdout=subprocess.PIPE,

stderr=subprocess.STDOUT)

p.wait()

# ugh, this is sloppy, but we only know to clean up

# if a chdiff wait is specified, so tidy up now

except OSError, e:

print >>sys.stderr, 'Execution failed:', e

if __name__ == '__main__':

sys.exit(main())