cote 0.17.1

Quickly build your command line utils
Documentation 
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use cote::prelude::*;
use std::{ffi::OsStr, sync::OnceLock};

#[derive(Debug, Cote)]
#[cote(fallback = cli_main, then = storer)]
pub struct Cli;

static FLAG: OnceLock<bool> = OnceLock::new();

fn cli_main<S>(_: &mut S, _: &mut Ctx) -> cote::Result<Option<()>> {
    FLAG.get_or_init(|| true);
    Ok(None)
}

fn storer<S>(_: Uid, _: &mut S, _: Option<&OsStr>, _: Option<()>) -> cote::Result<bool> {
    unreachable!("not call here if cli_main returns None")
}

#[test]
fn fallback() {
    assert!(fallback_impl().is_ok());
}

fn fallback_impl() -> color_eyre::Result<()> {
    color_eyre::install()?;
    let CoteRes { parser, .. } = Cli::parse_args(Args::from(["app"].into_iter()))?;
    assert_eq!(FLAG.get(), Some(&true), "Set flag in cli_main");
    assert_eq!(
        parser.find_opt("".infer::<Main>())?.rawval()?,
        OsStr::new("app")
    );
    Ok(())
}