Add ability to derive ClapKey to use enum variants as keys

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Issue by kbknapp
Sunday Nov 12, 2017 at 20:12 GMT
Originally opened as clap-rs/clap#1663

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See related discussion in clap-rs/clap#1104

Once the details in that issue are hashed out, we could then add support for:

#[derive(ClapKey)]
enum MyArgs {
     Foo,
     Bar,
     Baz,
}

fn main() {
    let matches = App::new("")
        /* stuff */ 
        .get_matches();
    let value = matches.value_of(MyArgs::Foo);
}

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Comment by Hoverbear
Sunday Nov 12, 2017 at 20:28 GMT

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Should this be part of initial publish?

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Comment by kbknapp
Sunday Nov 12, 2017 at 20:44 GMT

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This brings up a bigger point. Should clap-derives be usable on clap 2.x?

I'm leaning yes, because what you've done already works today. I also think we should be pushing towards a clap-derives which works on clap 3.x which this issue is aimed at.

So I think we need to find a way to differentiate between these two branches.