eb 0.3.5

use core::{
	cmp::PartialOrd,
	fmt::{self, Debug, Display, Formatter},
	result,
	time::Duration,
};

// This function is a basic implementation of the generic from the
// `core::cmp::Ord` clamp function, which is unstable.  This code is stable,
// but eventually you might want to change this to the `.clamp` method on
// ord-y things.
pub fn clamp<T>(value: T, min: T, max: T) -> T
where
	T: PartialOrd,
{
	assert!(min <= max);

	if value < min {
		min
	} else if value > max {
		max
	} else {
		value
	}
}

pub enum SlotTime {
	UserSpecified(Duration),
	AutoGenerated(Duration),
}

#[derive(PartialEq)]
pub enum Error {
	NoCommandGiven,
	ChildProcessTerminatedWithSignal,
}

impl Debug for Error {
	fn fmt(&self, f: &mut Formatter) -> result::Result<(), fmt::Error> {
		write!(
			f,
			"{}",
			match self {
				Self::NoCommandGiven => "no command given",
				Self::ChildProcessTerminatedWithSignal => "child process terminated with signal",
			}
		)
	}
}

impl Display for Error {
	fn fmt(&self, f: &mut Formatter) -> result::Result<(), fmt::Error> {
		Debug::fmt(self, f)
	}
}

impl std::error::Error for Error {}

pub type Result<T> = result::Result<T, Error>;

pub type ExecutionResult = Result<()>;

#[cfg(test)]
mod tests {
	use super::*;

	mod clamp {
		use super::clamp;

		mod i32 {
			use super::clamp;

			#[test]
			fn inside_range() {
				assert_eq!(clamp(1_i32, 0_i32, 2_i32), 1_i32);
			}

			#[test]
			fn below_range() {
				assert_eq!(clamp(-1_i32, 0_i32, 2_i32), 0_i32);
			}

			#[test]
			fn above_range() {
				assert_eq!(clamp(3_i32, 0_i32, 2_i32), 2_i32);
			}
		}

		#[test]
		#[should_panic]
		fn panics_if_not_ordered_properly() {
			clamp(1_i32, 2_i32, 0_i32);
		}
	}
}