Uglify (mix) line endings. Creates incompatible files.

line_uglify.py

"""
Replace line endings by 'mixed' line endings.

Behaviour is untested
"""
import argparse
import random

from typing import TextIO
import sys


def main(f_in: TextIO, f_out: TextIO, seed: int) -> None:
    rnd = random.Random()
    rnd.seed(seed)

    # For each line, replace line ending by 'new' line ending
    for line in f_in.readlines():
        # Get ending
        ending = random.choice([
          '\n',   # Unix
          '\r\n', # Windows
          '\r',   # OS9
        ])

        # lines end with \n
        f_out.write(line[:-1])
        f_out.write(ending)


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Uglify some line endings')
    parser.add_argument('input', type=argparse.FileType('r'),
                        help='Input file')
    parser.add_argument('out', type=str, nargs='?', default=None,
                        help='Output file')
    parser.add_argument('--seed', type=int, default=random.randint(0, 2**32),
                        help='random seed')

    args = parser.parse_args()

    if args.out:
        with open(args.out, 'w', newline='') as f_out:
            main(args.input, f_out, args.seed)
    else:
        main(args.input, sys.stdout, args.seed)