Create FireworkBuilder.kt

src/main/kotlin/net/axay/kspigot/utils/FireworkBuilder.kt

@@ -0,0 +1,25 @@
+package net.axay.kspigot.utils
+
+import net.axay.kspigot.items.meta
+import org.bukkit.FireworkEffect
+import org.bukkit.Material
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.FireworkMeta
+
+/**
+ * Opens a new FireworkMeta builder and creates
+ * an ItemStack with the new FireworkMeta applied.
+ */
+fun fireworkItemStack(amount: Int = 1, builder: FireworkMeta.() -> Unit) =
+    ItemStack(Material.FIREWORK_ROCKET, amount).apply {
+        meta<FireworkMeta> {
+            builder.invoke(this)
+        }
+    }
+
+/**
+ * Opens a new effect builder and adds this
+ * new effect to this FireworkMeta.
+ */
+fun FireworkMeta.addEffect(builder: FireworkEffect.Builder.() -> Unit) =
+    addEffect(FireworkEffect.builder().apply(builder).build())