Allow abbreviated argument names (see also allow_abbrev=True in argparse)

typer_abbr_args.py

import typer

def main(
    hello: int = typer.Option(None),
    there: int = typer.Option(None),
    infinite: bool = typer.Option(False),
) -> None:
    print(hello, there, infinite)

if __name__=='__main__':
    def token_normalize(token: str) -> str:
        "Predict argument by partial name"
        token_lower = token.lower()
        predicted_param = tuple(filter(lambda s: s.startswith(token_lower), available_params))
        if len(predicted_param) == 1:  # not ambiguous
            return predicted_param[0]
        return token

    # typer.run(main)
    app = typer.Typer()
    app.command(context_settings={'token_normalize_func': token_normalize})(main)
    available_params = [
        i.name.lower() for i in typer.main.get_command(app).params
        if isinstance(i.name, str) and i.name not in ('install_completion', 'show_completion')
    ]
    app()