//! Lists a directory: `ls [dir]`, the root by default.

#![no_std]
#![forbid(unsafe_code)]
#![no_main]

extern crate libkos;

use libkos::fs::{FsError, Storage};
use libkos::println;

/// Where storage's buffer is mapped.
const STORAGE_BUF_VA: types::address::VirtualAddress = types::address::VirtualAddress::from_raw(0x0180_0000);

libkos::entry!(main);

fn main() {
    let Some(mut fs) = libkos::start::storage().and_then(|ep| Storage::attach(ep, STORAGE_BUF_VA).ok()) else {
        println!("ls: no storage");
        return;
    };
    let dir = libkos::start::args().nth(1).unwrap_or("/");
    let listed = fs.list_dir(dir.as_bytes(), |e| {
        let name = core::str::from_utf8(e.name()).unwrap_or("?");
        if name == "." || name == ".." {
            return;
        }
        if e.is_dir {
            println!("{}/", name);
        } else {
            println!("{:<24} {:>8}", name, e.size);
        }
    });
    match listed {
        Ok(_) => {}
        Err(FsError::Denied) => println!("ls: {}: outside what it was given", dir),
        Err(_) => println!("ls: {}: no such directory", dir),
    }
}