extern crate clap;
use clap::{Arg, ArgAction, Command};

fn main() {
    // First test (from docs: https://docs.rs/clap/4.0.19/clap/parser/struct.ArgMatches.html#examples-10)

    let mut cmd = Command::new("myapp")
    .arg(Arg::new("output")
        .action(ArgAction::Set));

    let m = cmd
        .try_get_matches_from_mut(vec!["myapp", "something"])
        .unwrap();
    assert!(m.args_present());

    let m = cmd
        .try_get_matches_from_mut(vec!["myapp"])
        .unwrap();
    assert!(! m.args_present());

    println!("Passed first tests!");

    // Second test

    let mut cmd = Command::new("myapp")
                        .arg(Arg::new("A")
                            .action(ArgAction::Set)
                            .num_args(1)
                        )
                        .arg(Arg::new("B")
                            .short('s')
                            .action(ArgAction::SetTrue)
                            .num_args(0)
                        );

    let m = cmd
        .try_get_matches_from_mut(vec!["myapp", "something"])
        .unwrap();
    assert!(m.args_present());

    let m = cmd
        .try_get_matches_from_mut(vec!["myapp"])
        .unwrap();
    assert!(! m.args_present());

    println!("Pa