Using Clap for entirely the wrong purpose

Hi,

As the title suggests, I'm using the clap crate for something it's entirely not supposed to be used for. Long story short, I am trying to set up a REPL (which it can be used for, though that's not super important) that parses commands that are multiple words and do not contain flags (-f and --flag).

Here are are some example commands that I would like to parse:

toggle <FEATURE NAME> [ on | off ]

login name <USER NAME> key <digits>

setup [ init | position <POSITION STRING> ]

apply <STRING1> [STRING2 ... STRINGN]

For simple commands, like toggle <FEATURE> [ on | off ] I have been able to get this to work by using some features like ValueEnum. And, for the more complicated commands like setup [ init | position <STRING> ] I have been able to get a mock-up to work by nesting sub commands.

However, what I cannot figure out is how to get clap to parse a command whose argument is a single word. For example, I can parse toggle Debug on just fine. but I can't parse toggle Debug Info on.

I would like to know if anyone has worked with Clap enough to know of a solution to this.