git blame on git diff results

diffblame.py

#!/usr/bin/env python
"""usage: diffblame.py START..END [path]"""
import os,sys,subprocess

gitpath = subprocess.Popen(["git", "rev-parse","--show-toplevel"],\
    stdout=subprocess.PIPE).communicate()[0].strip()
diff = subprocess.Popen(["git", "diff","-U0"]+sys.argv[1:],\
    stdout=subprocess.PIPE).communicate()[0]
for l in diff.splitlines():
    if l=='':
        break
    if l.startswith('+++'):
        filename= os.path.join(gitpath,l[6:])
    if l.startswith('@@'):
        l2=l[3:l.find('@@',4)]
        to=l2[l2.find('+')+1:].strip()
        if ',' in to:
            to=',+'.join(to.split(','))
        else:
            to='%s,%s' % (to,to)
        print filename, '-L', to
        blame = subprocess.Popen(["git", "blame","-L %s" % to,sys.argv[1],\
            '--',filename],stdout=subprocess.PIPE).communicate()[0]
        print blame