clap/examples/enum_in_args.rs

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#[macro_use]
extern crate clap;
use clap::Clap;
arg_enum! {
#[derive(Debug)]
enum Baz {
Foo,
Bar,
FooBar
}
}
#[derive(StructOpt, Debug)]
struct Opt {
/// Important argument.
#[structopt(raw(possible_values = "&Baz::variants()", case_insensitive = "true"))]
i: Baz,
}
fn main() {
let opt = Opt::from_args();
println!("{:?}", opt);
}