use std::env;
use std::io;
use std::path::PathBuf;

fn main() -> io::Result<()> {
    let mut arguments = env::args_os();
    let program = arguments.next().unwrap_or_else(|| "rust_cli".into());
    let Some(destination) = arguments.next() else {
        return Err(io::Error::new(
            io::ErrorKind::InvalidInput,
            format!("usage: {} <destination>", PathBuf::from(program).display()),
        ));
    };

    if destination == "--help" {
        println!("usage: {} <destination>", PathBuf::from(program).display());
        return Ok(());
    }
    if arguments.next().is_some() {
        return Err(io::Error::new(
            io::ErrorKind::InvalidInput,
            "expected exactly one destination",
        ));
    }

    let destination = rust::run(&PathBuf::from(destination))?;
    println!("created {}", destination.display());
    Ok(())
}