Convert old style separator for new Xcode.

convert.py

#! /usr/bin/env python3

'''Convert old style separator for new Xcode.'''

import re
import sys

for file in sys.argv:
    with open(file, 'rw') as f:
        source = f.read()
        source, n = re.subn(r'^(\#pragma mark -\n\#pragma mark (.*))$', r'#pragma mark - \2', source, flags=re.M)
        if n:
            f.write(source)