skipping metavars for flags

[likewei92]

See this example script for click feature switches (adapted from https://click.palletsprojects.com/en/8.1.x/options/#feature-switches)

import sys
import rich_click as click


@click.command()
@click.option("--upper", "transformation", flag_value="upper", default=True, help="upper case")
@click.option("--lower", "transformation", flag_value="lower", help="lower case")
def info(transformation):
    click.echo(getattr(sys.platform, transformation)())


if __name__ == "__main__":
    info()

Before, rich-click would print this as help text:

 Usage: test.py [OPTIONS]                                 
                                                          
╭─ Options ──────────────────────────────────────────────╮
│ --upper    TEXT  upper case                            │
│ --lower    TEXT  lower case                            │
│ --help           Show this message and exit.           │
╰────────────────────────────────────────────────────────╯

but there is no input for the --upper and --lower flags. I believe all flags should not print metavars information. With this fix, we get:

 Usage: test.py [OPTIONS]                                 
                                                          
╭─ Options ──────────────────────────────────────────────╮
│ --upper      upper case                                │
│ --lower      lower case                                │
│ --help       Show this message and exit.               │
╰────────────────────────────────────────────────────────╯

[ewels]

Nice, thanks!

[likewei92]

@ewels do you mind making a new (minor version) release?

[ewels]

Yeah of course, now done: https://pypi.org/project/rich-click/1.6.1/