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#! /usr/bin/env nix-shell
#! nix-shell -i python3 -p 'python3.withPackages (ps: with ps; [ transformers argparse ])'

import sys
import argparse
from transformers import AutoTokenizer

def main():
    parser = argparse.ArgumentParser(
        description="Tokenize input text using specified model tokenizer."
    )
    parser.add_argument(
        '-m', '--model',
        type=str,
        default='gpt2',
        help='Model name for tokenizer, e.g., "gpt2", "distilgpt2". Default is "gpt2".'
    )
    args = parser.parse_args()

    # Read text from standard input
    text = sys.stdin.read().strip()

    # Load tokenizer for the specified model
    tokenizer = AutoTokenizer.from_pretrained(args.model)
    tokens = tokenizer.encode(text)

    print(len(tokens))

if __name__ == "__main__":
    main()