//! ls — list directory contents via the exports table.
//!
//! Args: [path] — defaults to "." (root).

#![no_std]
#![no_main]

#[panic_handler]
fn panic(_info: &core::panic::PanicInfo) -> ! {
    loop { core::hint::spin_loop(); }
}

fn put(exports: &rsapi::Exports, buf: &[u8]) {
    (exports.put_line)(rsapi::Line { ptr: buf.as_ptr(), len: buf.len() });
}

#[unsafe(no_mangle)]
pub extern "C" fn efi_main(exports: &'static rsapi::Exports, argc: usize, argv: *const rsapi::Arg) -> i32 {
    let path_str = if argc > 0 {
        let a = unsafe { &*argv };
        unsafe { core::str::from_utf8_unchecked(core::slice::from_raw_parts(a.ptr, a.len)) }
    } else {
        "/"
    };
    let h = (exports.fs_resolve)(rsapi::Line { ptr: path_str.as_ptr(), len: path_str.len() });
    if h < 0 { return 1; }
    let mut entry = rsapi::DirEntry {
        name: rsapi::Line { ptr: core::ptr::null(), len: 0 },
        is_dir: false,
        _pad: 0,
        size: 0,
    };
    while (exports.fs_dir_next)(h, &mut entry) {
        let name = unsafe { core::str::from_utf8_unchecked(core::slice::from_raw_parts(entry.name.ptr, entry.name.len)) };
        if entry.is_dir {
            let mut buf = [0u8; 64];
            let nb = name.as_bytes();
            buf[..nb.len()].copy_from_slice(nb);
            buf[nb.len()] = b'/';
            put(exports, &buf[..nb.len() + 1]);
        } else {
            put(exports, name.as_bytes());
        }
    }
    (exports.fs_close)(h);
    0
}