Converting function into CLI

ancli.py

from pathlib import Path

def concat(folder: str, output: str = 'concat.txt', include_names: bool = True):
    """Concatenates a list of files from a folder and saves them into a single file."""
    p = Path(folder)
    files = []
    for filename in p.iterdir():
        content = filename.open('r').read().strip()
        if include_names:
            content = f'{filename}\n{content}\n'
        files.append(content)
    single = '\n'.join(files)
    Path(output).open('w').write(single)