[Feature Request] Click-like parser

click 这样的方法，不跟 `shortcut` 的想法差不多
```python
@click.command()
@click.option('--count', default=1, help='Number of greetings.')
@click.option('--name', prompt='Your name',
              help='The person to greet.')
def hello(count, name):
    ...
```