Clap

clap-example.rs

extern crate clap;

use clap::{Arg, App};

struct HelloArgs {
    name: String,
}

impl HelloArgs {
    fn new() -> Self {
        // basic app information
        let app = App::new("hello-clap")
            .version("1.0")
            .about("Says hello")
            .author("Michael Snoyman");

        // Define the name command line option
        let name_option = Arg::with_name("name")
            .long("name") // allow --name
            .short("n") // allow -n
            .takes_value(true)
            .help("Who to say hello to")
            .required(true);

        // now add in the argument we want to parse
        let app = app.arg(name_option);
        // extract the matches
        let matches = app.get_matches();

        // Extract the actual name
        let name = matches.value_of("name")
            .expect("This can't be None, we said it was required");

        HelloArgs { name: name.to_string() }
    }
}

fn main() {
    let hello = HelloArgs::new();

    println!("Hello, {}!", hello.name);
}