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/**
 * Implements Default for an enum.
 * Requires the enum to have a variant named "Default"
 */
#[macro_export]
macro_rules! enum_default {
	($name: ident) => {
		impl Default for $name {
			fn default() -> Self {
				$name::Default
			}
		}
	};
}

/**
 * Implements a fmt trait for an enum.
 * The output is the enum as a number
 */
#[macro_export]
macro_rules! enum_fmt_impl {
	($name: ident, $trait: ident) => {
		impl $trait for $name {
			fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
				$trait::fmt(&(self.clone() as u8), f)
			}
		}
	};
}

/**
 * Implements the Display trait for an enum.
 * The output is the enum as a number
 */
#[macro_export]
macro_rules! enum_display {
	($name: ident) => {
		impl Display for $name {
			fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
				write!(f, "{}", self.clone() as u8)
			}
		}
	};
}

/** Implements several traits for a macro */
#[macro_export]
macro_rules! enum_impls {
	($name: ident) => {
		enum_default!($name);
		enum_display!($name);
		enum_fmt_impl!($name, Binary);
		enum_fmt_impl!($name, Octal);
		enum_fmt_impl!($name, LowerHex);
		enum_fmt_impl!($name, UpperHex);
	};
}

/** Implements several enums */
#[macro_export]
macro_rules! impl_enums {
	($($enum: ident),*) => {
		$(enum_impls!($enum);)*
	};
}

/** adds a set of functions to the trait */
#[macro_export]
macro_rules! chalk_trait_fns {
	($($name: ident),*) => {
		$(fn $name(&mut self) -> &mut Self;)*
	};
}

/** Sets up an alias for a function */
#[macro_export]
macro_rules! fn_alias {
	($alias: ident, $fn: ident) => {
		fn $alias(&mut self) -> &mut Self {self.$fn()}
	};
}