Custom spellings for CLI options

[akaihola]

If I define this function:

@hug.cli()
def foo(data: hug.types.text = 'default data', dry_run: hug.types.boolean = False):
    ...

I get these CLI options:

usage: dryrun.py [-h] [-d DATA] [-dr]

optional arguments:
  -h, --help            show this help message and exit
  -d DATA, --data DATA  Basic text / string value
  -dr, --dry_run        Providing any value will set this to true

I would much prefer dry_run to not have a short option, and to have a dash in --dry-run instead of an underscore.

In general, I would like the spelling of CLI options to be customizable.

I found this solution to this particular case, but unfortunately it fiddles with a private ArgumentParser attribute:

def cli(*args, **kwargs):
    option_strings = kwargs.pop('option_strings', {})

    def wrapper(func):
        api_function = hug.cli(*args, **kwargs)(func)
        for action in api_function.interface.cli.parser._actions:
            if action.dest in option_strings:
                action.option_strings = option_strings[action.dest]
        return api_function
    return wrapper

@cli(option_strings={'dry_run': ['--dry-run']})
def foo(data: hug.types.text = 'default data', dry_run: hug.types.boolean = False):
    ...

Can anyone think of a good way to add support for this in Hug?