berliner

#!/usr/bin/python3
import argparse
import random
import itertools


NAMES = [
    "@bkarnow",
    "@danigm",
    "@dylan-m",
    "@geri",
    "@jprvita",
    "@manuq",
    "@mwleeds",
    "@ramcq",
    "@renatop",
    "@wjt",
    "@erikos",
]


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--group-size", type=int, default=3)
    parser.add_argument("names", type=argparse.FileType("r"), nargs="?")
    args = parser.parse_args()

    if args.names:
        names = args.names.read().splitlines()
    else:
        names = NAMES
    random.shuffle(names)

    slices = [names[i :: args.group_size] for i in range(args.group_size)]
    groups = list(itertools.zip_longest(*slices))
    for i, row in enumerate(groups, 1):
        names = ", ".join(f"{name}" for name in row if name)
        print(f"Group {i}: {names}")


if __name__ == "__main__":
    main()