#[macro_use] extern crate text_io;
extern crate libc;

use std::process::Command;
use std::process;

fn main() {

   initialize_ui();

}

fn initialize_ui(){

        eprint!("$");
        let mut history: Vec<String> = Vec::new();
        loop{
            let line: String = read!("{}\n");
            let to_hist = line.clone();
            history.push(to_hist);
            let vec: Vec<&str> = line.split(" ").collect();
            process_cmd(vec, &history);
            eprint!("$");
        }

}

fn process_cmd(vec: Vec<&str>, history: &Vec<String> ){

    if vec[0].trim() == "exit"{
        process::exit(1);
    };

    if vec[0].trim() == "history"{
      let mut count: i32 = 0;
      for x in history {
          eprint!("[{}] {}\n", count, x);
          count = count + 1;
      }
    }else{
       let binary: &str = vec[0];
       let args: Vec<&str> =vec.iter().map(|v| *v).skip(1).collect();
       let mut child = Command::new(binary).args(&args).spawn().unwrap();
       let _result = child.wait().unwrap();
    }

}