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//  * 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.
//! Exit status codes produced by `timeout`.
use std::convert::From;
use uucore::error::UError;

/// Enumerates the exit statuses produced by `timeout`.
///
/// Use [`Into::into`] (or [`From::from`]) to convert an enumeration
/// member into a numeric status code. You can also convert into a
/// [`UError`].
///
/// # Examples
///
/// Convert into an [`i32`]:
///
/// ```rust,ignore
/// assert_eq!(i32::from(ExitStatus::CommandTimedOut), 124);
/// ```
pub(crate) enum ExitStatus {
    /// When the child process times out and `--preserve-status` is not specified.
    CommandTimedOut,

    /// When `timeout` itself fails.
    TimeoutFailed,

    /// When a signal is sent to the child process or `timeout` itself.
    SignalSent(usize),

    /// When there is a failure while waiting for the child process to terminate.
    WaitingFailed,
}

impl From<ExitStatus> for i32 {
    fn from(exit_status: ExitStatus) -> Self {
        match exit_status {
            ExitStatus::CommandTimedOut => 124,
            ExitStatus::TimeoutFailed => 125,
            ExitStatus::SignalSent(s) => 128 + s as Self,
            ExitStatus::WaitingFailed => 124,
        }
    }
}

impl From<ExitStatus> for Box<dyn UError> {
    fn from(exit_status: ExitStatus) -> Self {
        Box::from(i32::from(exit_status))
    }
}