main.rs

use std::io;

fn main() {
    let mut password = String::new();
    let chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 \'\".?!,-_$#@!%^&*()}{=+/\\`~<>";
    let mut guess = String::new();
    let mut iterations = 0;
    let mut failed = 0;
    let mut keep_running = true;

    println!("What's your password?");

    io::stdin()
        .read_line(&mut password)
        .expect("Failed to read line");
    password = String::from(password.trim_matches('\n'));

    while keep_running {
        for char in chars.repeat(2).chars() {
            let mut tmp_guess = guess.clone();

            if failed <= chars.len() {
                tmp_guess.push(char);
            } else if failed <= chars.len() * 2 {
                tmp_guess.insert(0, char);
            } else {
                keep_running = false;
            }

            match password.find(&tmp_guess) {
                Some(_) => {
                    guess = tmp_guess;
                    failed = 0
                },
                None => failed += 1
            }
            if password == guess {
                keep_running = false;
            }
            iterations += 1;
        }
    }
    if password == guess {
        println!("Your password is {}", guess);
        println!("It took {} iterations", iterations);
    } else {
        println!("Couldn't break your password");
    }
}