feat(InventoryUtil): add basic util for inventory search & interaction

src/main/java/me/alpha432/oyvey/util/inventory/InventoryUtil.java

@@ -0,0 +1,64 @@
+package me.alpha432.oyvey.util.inventory;
+
+import me.alpha432.oyvey.util.traits.Util;
+import net.minecraft.world.inventory.ClickType;
+import net.minecraft.world.item.ItemStack;
+
+import java.util.Set;
+import java.util.function.BiPredicate;
+import java.util.function.Predicate;
+
+public final class InventoryUtil implements Util {
+    public static final Result NONE = new Result(-1, ItemStack.EMPTY, ResultType.NONE);
+
+    private InventoryUtil() {
+        throw new AssertionError();
+    }
+
+    public static ItemStack cursor() {
+        return mc.player.containerMenu.getCarried();
+    }
+
+    public static int selected() {
+        return mc.player.getInventory().getSelectedSlot();
+    }
+
+    public static void click(int slot, int button, ClickType type) {
+        int id = mc.player.containerMenu.containerId;
+        mc.gameMode.handleInventoryMouseClick(id, slot, button, type, mc.player);
+    }
+
+    public static void swap(int to) {
+        if (to < 0 || to > 8) return;
+        mc.player.getInventory().setSelectedSlot(to);
+        mc.gameMode.ensureHasSentCarriedItem();
+    }
+
+    public static Result find(Predicate<ItemStack> predicate, ResultType... types) {
+        final Set<ResultType> set = Set.of(types);
+        return find((item, type) -> set.contains(type) && predicate.test(item));
+    }
+
+    public static Result find(BiPredicate<ItemStack, ResultType> predicate) {
+        ItemStack offhand = mc.player.getOffhandItem();
+        if (predicate.test(offhand, ResultType.OFFHAND)) {
+            return Result.fromOffhand(offhand);
+        }
+
+        for (int i = 0; i < 9; i++) {
+            ItemStack item = mc.player.getInventory().getItem(i);
+            if (predicate.test(item, ResultType.HOTBAR)) {
+                return new Result(i, item, ResultType.HOTBAR);
+            }
+        }
+
+        for (int i = 9; i < 36; i++) {
+            ItemStack item = mc.player.getInventory().getItem(i);
+            if (predicate.test(item, ResultType.INVENTORY)) {
+                return new Result(i, item, ResultType.INVENTORY);
+            }
+        }
+
+        return NONE;
+    }
+}

src/main/java/me/alpha432/oyvey/util/inventory/Result.java

@@ -0,0 +1,22 @@
+package me.alpha432.oyvey.util.inventory;
+
+import net.minecraft.world.InteractionHand;
+import net.minecraft.world.item.ItemStack;
+
+public record Result(int slot, ItemStack stack, ResultType type) {
+    static Result fromOffhand(ItemStack stack) {
+        return new Result(-1, stack, ResultType.OFFHAND);
+    }
+
+    public InteractionHand getHand() {
+        return type == ResultType.OFFHAND ? InteractionHand.OFF_HAND : InteractionHand.MAIN_HAND;
+    }
+
+    public boolean holding() {
+        return type == ResultType.OFFHAND || type == ResultType.HOTBAR && slot == InventoryUtil.selected();
+    }
+
+    public boolean found() {
+        return type != ResultType.NONE;
+    }
+}

src/main/java/me/alpha432/oyvey/util/inventory/ResultType.java

@@ -0,0 +1,8 @@
+package me.alpha432.oyvey.util.inventory;
+
+public enum ResultType {
+    HOTBAR,
+    INVENTORY,
+    OFFHAND,
+    NONE
+}

src/main/resources/oyvey.accesswidener

@@ -5,3 +5,4 @@ accessible field net/minecraft/network/protocol/game/ServerboundInteractPacket e
 accessible method net/minecraft/network/protocol/game/ServerboundInteractPacket$Action getType ()Lnet/minecraft/network/protocol/game/ServerboundInteractPacket$ActionType;
 accessible class net/minecraft/network/protocol/game/ServerboundInteractPacket$ActionType
 accessible field net/minecraft/network/protocol/game/ServerboundInteractPacket action Lnet/minecraft/network/protocol/game/ServerboundInteractPacket$Action;
+accessible method net/minecraft/client/multiplayer/MultiPlayerGameMode ensureHasSentCarriedItem ()V