Script that shows the diff for a file (using git) using Apple's graphical diff tool FileMerge

gitopendiff.py

#!/usr/bin/env python
import os
import sys
import tempfile
import subprocess

file = sys.argv[1];
proc = subprocess.Popen(['git', 'ls-tree', 'HEAD'],
    stdout=subprocess.PIPE, stderr = subprocess.PIPE)
output, errors = proc.communicate()

for line in output.split("\n"):
    if len(line) > 0:
        props, name = line.split('\t')
        props = props.split(' ')
        if name == file:
            blob = props[2]

if blob:
    proc = subprocess.Popen(['git', 'show', blob],
        stdout=subprocess.PIPE, stderr = subprocess.PIPE)
    output, errors = proc.communicate()
    original = tempfile.NamedTemporaryFile('w')
    original.write(output)
    original.flush()

    subprocess.call(['opendiff', original.name, file])