io.rs

use std::io::BufRead;

/// Reads i32 from the command line and returns a [Vec] containing
/// these numbers. Returns errors when the parsing fails.
pub fn read_command_line() -> Result<Vec<i32>, String> {
    let mut v = Vec::new();
    let stdin = std::io::stdin();
    println!("Enter a list of numbers, one per line. End with Ctrl-D (Linux) or Ctrl-Z (Windows).");

    for line in stdin.lock().lines() {
        let line = match line {
            Ok(l) => l,
            Err(_) => {
                return Err(String::from("Could not read line"));
            }
        };

        match line.trim().parse::<i32>() {
            Ok(num) => v.push(num),
            Err(_) => {
                return Err(String::from("Could not parse integer"));
            }
        }
    }
    Ok(v)
}

/// Prints all the elements of the `tab`.
/// Tab is borrowed here
pub fn print_tab(tab: &Vec<i32>) {
    for t in tab {
        print!("{} ", t);
    }
    println!();
}