structopt 0.3.9

Parse command line argument by defining a struct.
Documentation 
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//! How to use `clap::Arg::group`

use structopt::{clap::ArgGroup, StructOpt};

#[derive(StructOpt, Debug)]
#[structopt(group = ArgGroup::with_name("verb").required(true))]
struct Opt {
    /// Set a custom HTTP verb
    #[structopt(long, group = "verb")]
    method: Option<String>,
    /// HTTP GET
    #[structopt(long, group = "verb")]
    get: bool,
    /// HTTP HEAD
    #[structopt(long, group = "verb")]
    head: bool,
    /// HTTP POST
    #[structopt(long, group = "verb")]
    post: bool,
    /// HTTP PUT
    #[structopt(long, group = "verb")]
    put: bool,
    /// HTTP DELETE
    #[structopt(long, group = "verb")]
    delete: bool,
}

fn main() {
    let opt = Opt::from_args();
    println!("{:?}", opt);
}