feat: add const equivalents of color & flavor index impls (#18)

build.rs

@@ -174,8 +174,22 @@ fn make_colorname_index_impl<W: Write>(
             {}
         }}
     }}
+}}
+
+impl FlavorColors {{
+    /// Get a color by name.
+    ///
+    /// This is equivalent to using the index operator, but can also be used in
+    /// const contexts.
+    #[must_use]
+    pub const fn get_color(&self, name: ColorName) -> &Color {{
+        match name {{
+            {}
+        }}
+    }}
 }}",
-        match_arms.join("\n            ")
+        match_arms.join("\n            "),
+        match_arms.join("\n            "),
     )?;
     Ok(())
 }
@@ -245,7 +259,7 @@ fn make_colorname_fromstr_impl<W: Write>(
     let match_arms = sample_flavor
         .colors
         .keys()
-        .map(|name| format!("{:?} => Ok(ColorName::{}),", name, titlecase(name)))
+        .map(|name| format!("{:?} => Ok(Self::{}),", name, titlecase(name)))
         .collect::<Vec<_>>();
     writeln!(
         w,

src/lib.rs

@@ -203,6 +203,22 @@ impl Index<FlavorName> for Palette {
     }
 }
 
+impl Palette {
+    /// Get a flavor by name.
+    ///
+    /// This is equivalent to using the index operator, but can also be used in
+    /// const contexts.
+    #[must_use]
+    pub const fn get_flavor(&self, name: FlavorName) -> &Flavor {
+        match name {
+            FlavorName::Latte => &self.latte,
+            FlavorName::Frappe => &self.frappe,
+            FlavorName::Macchiato => &self.macchiato,
+            FlavorName::Mocha => &self.mocha,
+        }
+    }
+}
+
 impl fmt::Display for Hex {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         let Rgb { r, g, b } = self.0;
@@ -400,6 +416,17 @@ impl Index<ColorName> for Flavor {
     }
 }
 
+impl Flavor {
+    /// Get a color by name.
+    ///
+    /// This is equivalent to using the index operator, but can also be used in
+    /// const contexts.
+    #[must_use]
+    pub const fn get_color(&self, name: ColorName) -> &Color {
+        self.colors.get_color(name)
+    }
+}
+
 impl Color {
     /// Equivalent to [`<color>.name.identifier()`](ColorName::identifier).
     #[must_use]