use std::ffi::OsString;
use std::path::Path;
use clap::builder::ValueParser;
use clap::{crate_version, Arg, Command};
use uucore::error::UResult;
use uucore::utmpx::{self, Utmpx};
use uucore::{format_usage, help_about, help_usage};
const ABOUT: &str = help_about!("users.md");
const USAGE: &str = help_usage!("users.md");
static ARG_FILES: &str = "files";
fn get_long_usage() -> String {
format!(
"Output who is currently logged in according to FILE.
If FILE is not specified, use {}. /var/log/wtmp as FILE is common.",
utmpx::DEFAULT_FILE
)
}
#[uucore::main]
pub fn uumain(args: impl uucore::Args) -> UResult<()> {
let matches = uu_app()
.after_help(get_long_usage())
.try_get_matches_from(args)?;
let files: Vec<&Path> = matches
.get_many::<OsString>(ARG_FILES)
.map(|v| v.map(AsRef::as_ref).collect())
.unwrap_or_default();
let filename = if files.is_empty() {
utmpx::DEFAULT_FILE.as_ref()
} else {
files[0]
};
let mut users = Utmpx::iter_all_records_from(filename)
.filter(Utmpx::is_user_process)
.map(|ut| ut.user())
.collect::<Vec<_>>();
if !users.is_empty() {
users.sort();
println!("{}", users.join(" "));
}
Ok(())
}
pub fn uu_app() -> Command {
Command::new(uucore::util_name())
.version(crate_version!())
.about(ABOUT)
.override_usage(format_usage(USAGE))
.infer_long_args(true)
.arg(
Arg::new(ARG_FILES)
.num_args(1)
.value_hint(clap::ValueHint::FilePath)
.value_parser(ValueParser::os_string()),
)
}