Dropdown menu in web UI for custom arguments

[ktrnka]

Is your feature request related to a problem? Please describe.

We have a number of common configuration options in our use of Locust. Some of them have a short list of valid options and it's a bit of a hassle to go over to our repo documentation and/or code to figure out the valid options.

Describe the solution you'd like

I'd like to specify argparse choices when configuring a custom argument and have that affect the web UI. Example:

@events.init_command_line_parser.add_listener
def _(parser):
    parser.add_argument("--my-argument", type=str, env_var="LOCUST_MY_ARGUMENT", default="dev", help="It's working", choices=["dev", "staging", "prod")

Currently, this will validate the option values on the command line and print the valid options on error. It just doesn't affect the web UI.

Describe alternatives you've considered

Since Locust uses argparse/configargparse for this, it seems best to leverage their implementation. I didn't really consider alternatives that didn't match argparse.

Additional context

If you'd like I'm happy to submit a PR for this.

[cyberw]

Makes sense! PR welcome!

[github-actions]

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[cyberw]

Fixed