use l5 colorLerp and color fns

main.fnl

@@ -4,11 +4,8 @@
   (size 640 480)
   (textSize 100))
 
-(local colors {
-  :yellow [255 228 112] ; #ffe470
-  :dark [64 56 48] ; #403830
-})
-
+(local yellow (color  255 228 112)) ; #ffe470
+(local dark (color 64 56 48)) ; #403830
 (local steps (* 24  60))
 (var step 0)
 
@@ -32,8 +29,8 @@
   (let [
         half (/ steps 2)
         color-step (if (> step half) (- half (- step half)) step)
-        color-fn #(+ (. colors.dark $1) (* (/ (- (. colors.yellow $1) (. colors.dark $1)) half) color-step))]
-    (background (color-fn 1) (color-fn 2) (color-fn 3)))
+        current-color (lerpColor dark yellow (map color-step 0 half 0 1))]
+    (background current-color))
     (text (time step) 175 150)
     (text (time goal-time) 175 250)
     (when (and pause (= goal-time step)) (set won true))

minify.bb

@@ -58,7 +58,7 @@
 (def built-ins #{"fn" "local" "λ" "lambda" "require" "let" "+" "-" "/" "*" "<" ">" "<=" ">=" "not=" ".."
                  "var" "if" "when" "and" "or" "not" "do" "set" "each" "for" "while"
                  "true" "$1" "math.floor" "floor" "false" "nil" "size" "textSize" "background" "text" "random" "key"
-                 ":setup" ":draw" ":key-pressed" ":L5" "map"})
+                 ":setup" ":draw" ":key-pressed" ":L5" "map" "color" "lerpColor"})
 
 (defn collect-bindings [tokens]
   (reduce (fn [acc token]