Code shared from the Rust Playground

playground.rs

use std::fs;
use std::path::Path;

fn main() {
    let input = "/usr/share/doc";

    fn action(path: &str) { println!("\t{}" , path); }

    fn walk(path: &str) {
        println!("Listing {} ..." , path);
        for entry in fs::read_dir(&Path::new(&path)).unwrap() {

            let entry = entry.unwrap();
            if fs::metadata(&entry.path()).unwrap().is_dir() {
                walk(&entry.path().to_str().unwrap());
            } else { action(&entry.path().as_path().to_str().unwrap()); }
        }
    }

    walk(input);
}