getopt

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

getopt parses through options one at a time in the order they are given on the command line, stopping at the first non-option argument.

Example:

```rust

![allow(unusedassignments, unusedvariables)]

use getopt::prelude::*; use std::{env, error::Error};

fn main() -> Result<(), Box> { let mut args: Vec = env::args().collect(); let mut state = State::new();

let mut a_flag = false;
let mut b_flag = String::new();

loop {
    match getopt(&args, "ab:", &mut state)? {
        Opt(None, _) => break,
        Opt(Some('a'), None) => a_flag = true,
        Opt(Some('b'), Some(string)) => b_flag = string,
        _ => unreachable!(),
    }
}

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

// ...

Ok(())

} ```

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