feat: make colors/flavors accessible in const context (#10)

examples/term.rs

@@ -2,7 +2,7 @@ use catppuccin::Flavour;
 
 fn main() {
     // iterate over the four Catppuccin flavours.
-    for flavour in Flavour::into_iter() {
+    for flavour in Flavour::all() {
         println!("{}", flavour.name());
 
         // iterate over the 26 colours in the flavour.

src/flavour.rs

@@ -11,12 +11,12 @@ pub enum Flavour {
 
 macro_rules! impl_colour_method {
     ($x:ident) => (
-        pub fn $x(self) -> $crate::Colour {
+        pub const fn $x(self) -> $crate::Colour {
             self.colours().$x
         }
     );
     ($x:ident, $($y:ident),+ $(,)?) => (
-        pub fn $x(self) -> $crate::Colour {
+        pub const fn $x(self) -> $crate::Colour {
             self.colours().$x
         }
 
@@ -26,7 +26,7 @@ macro_rules! impl_colour_method {
 
 impl Flavour {
     /// Returns the name of the flavour in lowercase.
-    pub fn name(self) -> &'static str {
+    pub const fn name(self) -> &'static str {
         match self {
             Self::Latte => "latte",
             Self::Frappe => "frappe",
@@ -35,7 +35,7 @@ impl Flavour {
         }
     }
 
-    pub fn colours(self) -> FlavourColours {
+    pub const fn colours(self) -> FlavourColours {
         match self {
             Self::Latte => FlavourColours {
                 rosewater: Colour(220, 138, 120),
@@ -153,8 +153,13 @@ impl Flavour {
     }
 
     /// Returns an iterator over the four delicious Catppuccin flavours.
-    pub fn into_iter() -> std::array::IntoIter<Flavour, 4> {
-        [Self::Latte, Self::Frappe, Self::Macchiato, Self::Mocha].into_iter()
+    pub fn into_iter() -> std::array::IntoIter<Self, 4> {
+        Self::all().into_iter()
+    }
+
+    /// Returns an array of the four delicious Catppuccin flavours.
+    pub const fn all() -> [Self; 4] {
+        [Self::Latte, Self::Frappe, Self::Macchiato, Self::Mocha]
     }
 }
 

src/lib.rs

@@ -77,7 +77,7 @@ mod tests {
     /// Ensures flavours are iterated in the correct order.
     #[test]
     fn test_flavours_iter() {
-        let mut flavours = Flavour::into_iter();
+        let mut flavours = Flavour::all().into_iter();
         assert_eq!(flavours.next(), Some(Flavour::Latte));
         assert_eq!(flavours.next(), Some(Flavour::Frappe));
         assert_eq!(flavours.next(), Some(Flavour::Macchiato));
@@ -88,7 +88,7 @@ mod tests {
     /// Ensures colours within each flavour are iterated in the correct order.
     #[test]
     fn test_colours_iter() {
-        for flavour in Flavour::into_iter() {
+        for flavour in Flavour::all() {
             let colours = flavour.colours();
             let mut colours_iter = colours.into_iter();
             assert_eq!(colours_iter.next(), Some(colours.rosewater));