use rustyline::error::ReadlineError;
use rustyline::Editor;

mod parser;
mod prompt;

fn main() {
    match std::fs::read_to_string("/etc/motd") {
        Ok(motd) => print!("{}", motd),
        Err(_) => {}
    }

    let prompt = prompt::Prompt::new().unwrap();
    let mut cwd = std::env::current_dir().unwrap();
    let mut status: Option<std::process::ExitStatus> = None;

    // `()` can be used when no completer is required
    let mut rl = Editor::<()>::new();
    /*if rl.load_history("history.txt").is_err() {
        println!("No previous history.");
    }*/
    'repl: loop {
        let readline = rl.readline(&prompt.print(&cwd));
        match readline {
            Ok(line) => {
                rl.add_history_entry(line.as_str());

                let i = parser::tokenize(&line);
                match i.run(&prompt.home, &mut cwd, &status) {
                    Ok(parser::command::RunResult::Command(s)) => status = Some(s),
                    Ok(parser::command::RunResult::Builtin) => {}
                    Err(e) => eprintln!("{}", e),
                }
            }
            Err(ReadlineError::Interrupted) => {
                println!("CTRL-C");
                continue;
            }
            Err(ReadlineError::Eof) => {
                println!("CTRL-D");
                break 'repl;
            }
            Err(err) => {
                println!("Error: {:?}", err);
                break 'repl;
            }
        }
    }
    //rl.save_history("history.txt").unwrap();
}