camel2snake.py

#!/usr/bin/env python3

"""
Convert camelCase file into snake_case file using python.
"""


import re
import argparse
import sys
_underscorer1 = re.compile(r'(.)([A-Z][a-z]+)')
_underscorer2 = re.compile('([a-z0-9])([A-Z])')

def camelToSnake(s):
    """ 
    Is it ironic that this function is written in camel case, yet it
    converts to snake case? hmm..
    """
    subbed = _underscorer1.sub(r'\1_\2', s)
    return _underscorer2.sub(r'\1_\2', subbed).lower()


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Convert camelCase file into snake_case file using python.')
    parser.add_argument('-i', type=str, required=True,
                        help='input file')
    parser.add_argument('-o', required=True,
                        help='out file')

    args = parser.parse_args()
    try:
        with open(args.i, 'r') as f:
            content = f.read()
            new_content = camelToSnake(content)
    except FileNotFoundError:
        print("File {} not found.".format(args.i))
        sys.exit(1)
    with open(args.o, 'w') as f:
        f.write(new_content)

Quick Usage:

python3 <(curl -s https://gist.githubusercontent.com/thewh1teagle/908fff285bbac0acde03f7e0aeb59e2a/raw/c310ebb413440721cef68723f76d34593e6a9938/camel2snake.py) \
-i infile -o outfile