feat: add item tracking for Chiseled Bookshelf (#368)

Author: netcrafts

src/main/java/com/github/quiltservertools/ledger/mixin/blocks/ChiseledBookShelfBlockMixin.java

@@ -0,0 +1,73 @@
+package com.github.quiltservertools.ledger.mixin.blocks;
+
+import com.github.quiltservertools.ledger.callbacks.ItemInsertCallback;
+import com.github.quiltservertools.ledger.callbacks.ItemRemoveCallback;
+import com.github.quiltservertools.ledger.utility.Sources;
+import com.llamalad7.mixinextras.injector.ModifyExpressionValue;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.ChiseledBookShelfBlock;
+import net.minecraft.world.level.block.entity.ChiseledBookShelfBlockEntity;
+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.CallbackInfo;
+
+@Mixin(ChiseledBookShelfBlock.class)
+public class ChiseledBookShelfBlockMixin {
+
+    /**
+     * Fires ItemInsertCallback after a book is successfully placed into a chiseled bookshelf slot.
+     * Hooks into addBook(), which only runs server-side, after setItem() stores the book.
+     */
+    @Inject(
+        method = "addBook",
+        at = @At(
+            value = "INVOKE",
+            target = "Lnet/minecraft/world/level/block/entity/ChiseledBookShelfBlockEntity;setItem(ILnet/minecraft/world/item/ItemStack;)V",
+            shift = At.Shift.AFTER
+        )
+    )
+    private static void onAddBook(
+        Level level,
+        BlockPos pos,
+        Player player,
+        ChiseledBookShelfBlockEntity bookshelfBlock,
+        ItemStack itemStack,
+        int slot,
+        CallbackInfo ci
+    ) {
+        ItemStack insertedBook = bookshelfBlock.getItem(slot);
+        if (!insertedBook.isEmpty() && level instanceof ServerLevel serverLevel) {
+            ItemInsertCallback.EVENT.invoker().insert(insertedBook, pos, serverLevel, Sources.PLAYER, player);
+        }
+    }
+
+    /**
+     * Fires ItemRemoveCallback when a book is removed from a chiseled bookshelf slot.
+     * Hooks into removeBook() to capture the removed ItemStack returned by removeItem().
+     */
+    @ModifyExpressionValue(
+        method = "removeBook",
+        at = @At(
+            value = "INVOKE",
+            target = "Lnet/minecraft/world/level/block/entity/ChiseledBookShelfBlockEntity;removeItem(II)Lnet/minecraft/world/item/ItemStack;"
+        )
+    )
+    private static ItemStack onRemoveBook(
+        ItemStack removedStack,
+        Level level,
+        BlockPos pos,
+        Player player,
+        ChiseledBookShelfBlockEntity bookshelfBlock,
+        int slot
+    ) {
+        if (!removedStack.isEmpty() && level instanceof ServerLevel serverLevel) {
+            ItemRemoveCallback.EVENT.invoker().remove(removedStack, pos, serverLevel, Sources.PLAYER, player);
+        }
+        return removedStack;
+    }
+}

src/main/resources/ledger.mixins.json

@@ -40,6 +40,7 @@
         "blocks.CampfireBlockMixin",
         "blocks.CandleBlockMixin",
         "blocks.CarvedPumpkinBlockMixin",
+        "blocks.ChiseledBookShelfBlockMixin",
         "blocks.ChorusFlowerBlockMixin",
         "blocks.ChorusPlantBlockMixin",
         "blocks.ComparatorBlockMixin",