Arcanist wrapper

arc.py

#!/usr/bin/python2.7

from __future__ import print_function
import os
import stat
import subprocess
import sys


REAL_ARC='/usr/local/google/home/jlebar/code/arcanist/bin/arc'


def main():
  if len(sys.argv) != 3 or sys.argv[1] != 'diff':
    # Not "arc diff blah"; fall through.
    return

  try:
    # TODO: This loses us color and pagination, but oh well.
    diff = subprocess.check_output(['git', 'clang-format', '--diff', sys.argv[2]])
  except subprocess.CalledProcessError:
    yorn = raw_input('Error running git-clang-format.  Continue running arc? [yN] ')
    if yorn.lower() == 'y':
      return
    sys.exit(1)

  if not diff:
    return

  print('clang-format suggested the following changes:\n')
  print(diff)

  mode = os.fstat(sys.stdin.fileno()).st_mode
  if stat.S_ISFIFO(mode) or stat.S_ISREG(mode):
    print('Detected non-interactive mode.  Proceeding to arc diff...',
          file=sys.stderr)
    return

  yorn = raw_input('Proceed with arc diff? [yN] ')
  if yorn.lower() != 'y':
    sys.exit(1)


if __name__ == '__main__':
  main()
  os.execv(REAL_ARC, sys.argv)