Typoglycemia on dailyprogrammer 240 easy.

240easy.rs

use std::fs::File;
use std::io::Read;
use rand::Rng;

extern crate rand;

fn main() {
    let mut f = File::open("/Users/itarato/Documents/Rust/240.in").unwrap();
    let mut content: String = String::new();
    f.read_to_string(&mut content).ok().expect("Cannot read input");

    let chars: Vec<char> = content.chars().collect();

    let mut word_buf: Vec<char> = Vec::new();
    let mut content_buf: Vec<char> = Vec::new();
    for ch in chars {
        match ch {
            ch @ 'a' ... 'z' | ch @ 'A' ... 'Z' => {
                word_buf.push(ch);
            },
            _ if word_buf.len() > 0 => {
                shuffle(&mut word_buf);
                content_buf.append(&mut word_buf);
                content_buf.push(ch);

                word_buf.clear();
            },
            _ => content_buf.push(ch),
        }
    }

    let mut out = String::new();
    for ch in content_buf {
        out = format!("{}{}", out, &ch);
    }
    println!("{:?}", out);
}

fn shuffle(word: &mut Vec<char>) {
    let mut rng = rand::thread_rng();
    for i in 1..word.len() - 1 {
        let rand_pos = rng.gen_range::<usize>(1, word.len() - 1);
        word.swap(i, rand_pos);
    }
}