rip-starttls 0.1.0

Sans I/O implementation of <https://duesee.dev/p/avoid-implementing-starttls/>
Documentation 
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#![cfg(feature = "std")]

use std::{
    env,
    net::{Shutdown, TcpStream},
};

use rip_starttls::imap::std::RipStarttls;

fn main() {
    env_logger::builder().is_test(true).init();

    let host = env::var("HOST").expect("HOST should be defined");
    let port: u16 = env::var("PORT")
        .expect("PORT should be defined")
        .parse()
        .expect("PORT should be an unsigned integer");

    println!("connecting to {host}:{port} using TCP…");
    let tcp_stream =
        TcpStream::connect((host.as_str(), port)).expect("should connect to TCP stream");

    println!("preparing TCP connection for STARTTLS…");
    let tcp_stream = RipStarttls::default()
        .do_starttls_prefix(tcp_stream)
        .expect("should prepare TCP stream for IMAP STARTTLS");

    println!("connection TLS-ready, disconnecting…");
    tcp_stream
        .shutdown(Shutdown::Both)
        .expect("should close TCP stream");
}