Show %(default)

[rsheftel]

I commonly create my add arguments like this:

parser.add_argument( "-n", "--host", dest="host", type=str, help="host machine (default: %(default)s)", default="localhost", required=True, )

which will show on the CLI like this:

Options: -h, --help show this help message and exit -n, --host HOST host machine (default: localhost)

With argparse-interface it does not parse the %(default)s and shows that text. It would be great if it did parse it properly so that I can keep that default description in for the CLI, and have it look consistent with the TUI

[Sorcerio]

I have been thinking about this as well, but, for the time being, I think the argparse.ArgumentDefaultsHelpFormatter will work because it formats the help text like that as well:

parser = argparse.ArgumentParser(
    prog='PROG',
    formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument('--foo', type=int, default=42, help='FOO!')
parser.add_argument('bar', nargs='*', default=[1, 2, 3], help='BAR!')
parser.print_help()

usage: PROG [-h] [--foo FOO] [bar ...]

positional arguments:
 bar         BAR! (default: [1, 2, 3])

options:
 -h, --help  show this help message and exit
 --foo FOO   FOO! (default: 42)

If you end up trying it and if the argparse.ArgumentDefaultsHelpFormatter doesn't work, let me know since I'll want to implement support for both.