// This file is part of the uutils coreutils package.
//
// For the full copyright and license information, please view the LICENSE
// file that was distributed with this source code.

// spell-checker:ignore (ToDO) getlogin userlogin

use clap::Command;
use std::ffi::CStr;
use std::io::{Write, stdout};
use uucore::translate;
use uucore::{error::UResult, show_error};

fn get_userlogin() -> Option<String> {
    unsafe {
        let login: *const libc::c_char = libc::getlogin();
        if login.is_null() {
            None
        } else {
            Some(String::from_utf8_lossy(CStr::from_ptr(login).to_bytes()).to_string())
        }
    }
}

#[uucore::main(no_signals)]
pub fn uumain(args: impl uucore::Args) -> UResult<()> {
    let _ = uucore::clap_localization::handle_clap_result(uu_app(), args)?;

    if let Some(userlogin) = get_userlogin() {
        writeln!(stdout(), "{userlogin}")?;
    } else {
        show_error!("{}", translate!("logname-error-no-login-name"));
    }

    Ok(())
}

pub fn uu_app() -> Command {
    Command::new(uucore::util_name())
        .version(uucore::crate_version!())
        .help_template(uucore::localized_help_template(uucore::util_name()))
        .override_usage(translate!("logname-usage"))
        .about(translate!("logname-about"))
        .infer_long_args(true)
}
