Open git diff in github

ghdiff.py

import os
import subprocess
import re
import sys

def is_a_git_repo():
  return os.path.exists('.git') and os.path.isdir('.git')

def split_SSH_URL(s):
  m = re.search('git@(.*?):(.*?)/(.*?).git', s)
  urlObj = {}
  urlObj['hostname'] = m.group(1)
  urlObj['user'] = m.group(2)
  urlObj['repo'] = m.group(3)
  return urlObj

def split_https_URL():
  return ''

def getRemote():
  output = subprocess.check_output(['git', 'remote', '-v'])
  s=output.decode('utf-8').split('\n')[0]
  return split_SSH_URL(s)

def build_URL(urlObj, commit1, commit2):
  return 'https://'+urlObj['hostname']+'/'+urlObj['user']+'/'+urlObj['repo']+'/compare/'+commit1+'...'+commit2

def open_URL(url):
  subprocess.check_output(['open', url])


if __name__ == '__main__':
  if len(sys.argv) == 3:
    commit1 = sys.argv[1]
    commit2 = sys.argv[2]
    open_URL(build_URL(getRemote(), commit1, commit2))
    sys.exit(0)
  else:
    print('Invalid arguments.\nUsage: python ghdiff <commit1> <commit2>')
    sys.exit(1)
    

alias ghdiff='function _ghdiff(){ python ~/ghdiff.py $@; };_ghdiff'