Fix item rarity not displaying in npc shops

src/main/kotlin/moe/nea/firmament/features/inventory/ItemRarityCosmetics.kt

@@ -19,6 +19,9 @@ import moe.nea.firmament.features.FirmamentFeature
 import moe.nea.firmament.gui.config.ManagedConfig
 import moe.nea.firmament.util.MC
 import moe.nea.firmament.util.item.loreAccordingToNbt
+import moe.nea.firmament.util.lastNotNullOfOrNull
+import moe.nea.firmament.util.memoize
+import moe.nea.firmament.util.memoizeIdentity
 import moe.nea.firmament.util.unformattedString
 
 object ItemRarityCosmetics : FirmamentFeature {
@@ -48,15 +51,19 @@ object ItemRarityCosmetics : FirmamentFeature {
         val c = Color(it.value.colorValue!!)
         Triple(c.red / 255F, c.green / 255F, c.blue / 255F)
     }
-    private val ItemStack.skyblockLoreRarityColor: Triple<Float, Float, Float>?
-        get() {
-            val entry = loreAccordingToNbt.lastOrNull()?.unformattedString ?: ""
-            return rarityToColor.entries.find { (k, v) -> k in entry }?.value
+
+    private fun getSkyblockRarity0(itemStack: ItemStack): Triple<Float, Float, Float>? {
+        return itemStack.loreAccordingToNbt.lastNotNullOfOrNull {
+            val entry = it.unformattedString
+            rarityToColor.entries.find { (k, v) -> k in entry }?.value
         }
+    }
+
+    val getSkyblockRarity = ::getSkyblockRarity0.memoizeIdentity(100)
 
 
     fun drawItemStackRarity(drawContext: DrawContext, x: Int, y: Int, item: ItemStack) {
-        val (r, g, b) = item.skyblockLoreRarityColor ?: return
+        val (r, g, b) = getSkyblockRarity(item) ?: return
         drawContext.drawSprite(
             x, y,
             0,

src/main/kotlin/moe/nea/firmament/util/IdentityCharacteristics.kt

@@ -1,5 +1,6 @@
 /*
  * SPDX-FileCopyrightText: 2023 Linnea Gräf <nea@nea.moe>
+ * SPDX-FileCopyrightText: 2024 Linnea Gräf <nea@nea.moe>
  *
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
@@ -8,7 +9,9 @@ package moe.nea.firmament.util
 
 class IdentityCharacteristics<T>(val value: T) {
     override fun equals(other: Any?): Boolean {
-        return value === other
+        if (this === other) return true
+        if (other !is IdentityCharacteristics<*>) return false
+        return value === other.value
     }
 
     override fun hashCode(): Int {

src/main/kotlin/moe/nea/firmament/util/MutableMapWithMaxSize.kt

@@ -11,3 +11,22 @@ fun <K, V> mutableMapWithMaxSize(maxSize: Int): MutableMap<K, V> = object : Link
         return size > maxSize
     }
 }
+
+fun <T, R> ((T) -> R).memoizeIdentity(maxCacheSize: Int): (T) -> R {
+    val memoized = { it: IdentityCharacteristics<T> ->
+        this(it.value)
+    }.memoize(maxCacheSize)
+    return { memoized(IdentityCharacteristics(it)) }
+}
+
+private val SENTINEL_NULL = java.lang.Object()
+fun <T, R> ((T) -> R).memoize(maxCacheSize: Int): (T) -> R {
+    val map = mutableMapWithMaxSize<T, Any>(maxCacheSize)
+    return {
+        val value = map.computeIfAbsent(it) { innerValue ->
+            this(innerValue) ?: SENTINEL_NULL
+        }
+        if (value == SENTINEL_NULL) null as R
+        else value as R
+    }
+}

src/main/kotlin/moe/nea/firmament/util/item/NbtItemData.kt

@@ -21,6 +21,6 @@ var ItemStack.loreAccordingToNbt
 val ItemStack.displayNameAccordingToNbt
     get() = get(DataComponentTypes.CUSTOM_NAME) ?: get(DataComponentTypes.ITEM_NAME) ?: item.name
 
-fun ItemStack.setCustomName(literal: Text) {
-    set(DataComponentTypes.CUSTOM_NAME, literal)
+fun ItemStack.setCustomName(text: Text) {
+    set(DataComponentTypes.CUSTOM_NAME, text)
 }

src/main/kotlin/moe/nea/firmament/util/listutil.kt

@@ -0,0 +1,14 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Linnea Gräf <nea@nea.moe>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package moe.nea.firmament.util
+
+fun <T, R> List<T>.lastNotNullOfOrNull(func: (T) -> R?): R? {
+    for (i in indices.reversed()) {
+        return func(this[i]) ?: continue
+    }
+    return null
+}