[Rust] A minimalistic, (essentially) POSIX-compliant option parser (https://crates.io/crates/getopt)



A minimal, (essentially) POSIX-compliant option parser.

getopt::Parser iterates over the provided arguments, producing options one at a time in the order in which they are given on the command line, and stopping at the first non-option argument.


#![allow(unused_assignments, unused_variables)]

use getopt::prelude::*;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut args: Vec<String> = std::env::args().collect();
    let mut opts = Parser::new(&args, "ab:");

    let mut a_flag = false;
    let mut b_flag = String::new();
    loop {
        match opts.next().transpose()? {
            None => break,
            Some(opt) => match opt {
                Opt(&#39;a&#39;, None) => a_flag = true,
                Opt(&#39;b&#39;, Some(string)) => b_flag = string.clone(),
                _ => unreachable!(),

    let args = args.split_off(opts.index());

    // …