feat(perf): cache colors for up to 3x speed improvements

lua/rose-pine/utilities.lua

@@ -14,10 +14,17 @@ local function color_to_rgb(color)
 	return { byte(new_color, 16), byte(new_color, 8), byte(new_color, 0) }
 end
 
+local color_cache = {}
+
 ---@param color string Palette key or hex value
 function utilities.parse_color(color)
+	if color_cache[color] then
+		return color_cache[color]
+	end
+
 	if color == nil then
-		return print("Invalid color: " .. color)
+		print("Invalid color: " .. color)
+		return nil
 	end
 
 	color = color:lower()
@@ -26,13 +33,21 @@ function utilities.parse_color(color)
 		color = require("rose-pine.palette")[color] or vim.api.nvim_get_color_by_name(color)
 	end
 
+	color_cache[color] = color
 	return color
 end
 
+local blend_cache = {}
+
 ---@param fg string Foreground color
 ---@param bg string Background color
 ---@param alpha number Between 0 (background) and 1 (foreground)
 function utilities.blend(fg, bg, alpha)
+	local cache_key = fg .. bg .. alpha
+	if blend_cache[cache_key] then
+		return blend_cache[cache_key]
+	end
+
 	local fg_rgb = color_to_rgb(fg)
 	local bg_rgb = color_to_rgb(bg)
 
@@ -41,7 +56,10 @@ function utilities.blend(fg, bg, alpha)
 		return math.floor(math.min(math.max(0, ret), 255) + 0.5)
 	end
 
-	return string.format("#%02X%02X%02X", blend_channel(1), blend_channel(2), blend_channel(3))
+	local result = string.format("#%02X%02X%02X", blend_channel(1), blend_channel(2), blend_channel(3))
+
+	blend_cache[cache_key] = result
+	return result
 end
 
 return utilities