Add mixin to localize item names in chat components on the client (#480)

src/main/java/com/gtnewhorizon/gtnhlib/GTNHLibConfig.java

@@ -36,6 +36,11 @@ public class GTNHLibConfig {
     @Config.DefaultBoolean(true)
     public static boolean enableTranslucentItemRenders;
 
+    @Config.Comment("Replace item names in chat components (death messages, /give feedback, NEI item linking) with GTNHLib custom components so they are localized on the client. Disable this if vanilla (non-GTNHLib) clients connect to your server, as they cannot deserialize GTNHLib custom chat components.")
+    @Config.DefaultBoolean(true)
+    @Config.RequiresMcRestart
+    public static boolean enableLocalizedItemChatComponents;
+
     @Config.Comment("Enable client-side resource pack update checking for active packs")
     @Config.DefaultBoolean(true)
     public static boolean enableResourcePackUpdateCheck;

src/main/java/com/gtnewhorizon/gtnhlib/mixins/Mixins.java

@@ -57,6 +57,9 @@ public enum Mixins implements IMixins {
             .setApplyIf(() -> GTNHLibConfig.enableTranslucentItemRenders)),
     CUSTOM_CHAT_COMPONENT_REGISTRATION(new MixinBuilder("Custom chat component registration")
             .addCommonMixins("MixinIChatComponentSerializer").setPhase(Phase.EARLY)),
+    ITEM_CHAT_COMPONENT(new MixinBuilder("Localize item names in chat components on the client")
+            .addCommonMixins("MixinItemStack_GetChatComponent").setPhase(Phase.EARLY)
+            .setApplyIf(() -> GTNHLibConfig.enableLocalizedItemChatComponents)),
     MULTI_RELEASE_JAR_FILTER(new MixinBuilder("Skip multi-release JAR entries in mod discovery")
             .addCommonMixins("fml.MixinJarDiscoverer").setPhase(Phase.EARLY).addExcludedMod(TargetMods.LWJGL3IFY)),
     PICK_BLOCK_TRAP(Side.CLIENT, "MixinMinecraft_PickBlockTrap"),

src/main/java/com/gtnewhorizon/gtnhlib/mixins/early/MixinItemStack_GetChatComponent.java

@@ -0,0 +1,46 @@
+package com.gtnewhorizon.gtnhlib.mixins.early;
+
+import net.minecraft.event.HoverEvent;
+import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.util.ChatComponentText;
+import net.minecraft.util.IChatComponent;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import com.gtnewhorizon.gtnhlib.chat.customcomponents.ChatComponentItemName;
+
+/**
+ * Vanilla {@code ItemStack.func_151000_E()} bakes the already-translated {@code getDisplayName()} into a
+ * {@link ChatComponentText} before the component is sent to the client. Because that translation happens on the server,
+ * clients end up rendering the server's language instead of their own for death messages, {@code /give} feedback,
+ * statistics, etc.
+ *
+ * <p>
+ * This mixin replaces the name text with a {@link ChatComponentItemName}, which carries the raw {@link ItemStack}. The
+ * stack is serialized as-is and only resolved via {@code getDisplayName()} on the client, using the client's locale.
+ */
+@Mixin(ItemStack.class)
+public class MixinItemStack_GetChatComponent {
+
+    @Inject(method = "func_151000_E", at = @At("HEAD"), cancellable = true)
+    private void gtnhlib$localizeItemNameOnClient(CallbackInfoReturnable<IChatComponent> cir) {
+        ItemStack stack = (ItemStack) (Object) this;
+
+        // ChatComponentItemName already renders as "[name]" (with brackets) like vanilla func_151000_E().
+        IChatComponent ichatcomponent = new ChatComponentItemName(stack);
+
+        if (stack.getItem() != null) {
+            NBTTagCompound nbttagcompound = new NBTTagCompound();
+            stack.writeToNBT(nbttagcompound);
+            ichatcomponent.getChatStyle().setChatHoverEvent(
+                    new HoverEvent(HoverEvent.Action.SHOW_ITEM, new ChatComponentText(nbttagcompound.toString())));
+            ichatcomponent.getChatStyle().setColor(stack.getRarity().rarityColor);
+        }
+
+        cir.setReturnValue(ichatcomponent);
+    }
+}