v0.1.0 release: replaces blocks in your hotbar with blocks from your inventory

gradle.properties

@@ -12,7 +12,7 @@ loader_version=0.14.17
 
 # Mod Properties
 mod_version = 0.1.0
-maven_group = today.theladpack
+maven_group = io.github.twokilohertz
 archives_base_name = HotbarReplace
 
 # Dependencies

src/main/java/io/github/twokilohertz/HotbarReplace.java

@@ -0,0 +1,67 @@
+package io.github.twokilohertz;
+
+import net.fabricmc.api.ModInitializer;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.entity.player.PlayerInventory;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemPlacementContext;
+import net.minecraft.item.ItemStack;
+import net.minecraft.screen.slot.SlotActionType;
+import org.lwjgl.glfw.GLFW;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+public class HotbarReplace implements ModInitializer {
+    public static final Logger LOGGER = LoggerFactory.getLogger("hotbarreplace");
+    private static final MinecraftClient client = MinecraftClient.getInstance();
+    private static final ScheduledExecutorService scheduler = Executors.newSingleThreadScheduledExecutor();
+
+    @Override
+    public void onInitialize() {
+        LOGGER.info("HotbarReplace initialised");
+    }
+
+    public static void tryReplaceSlot(ItemPlacementContext context, Item item) {
+        // Return immediately if player is a spectator
+        PlayerEntity player = context.getPlayer();
+        if (player.isSpectator()) return;
+
+        // Creative inventories don't run out of anyway
+        if (player.getAbilities().creativeMode) return;
+
+        // Get reference to player's current inventory
+        PlayerInventory inventory = player.getInventory();
+        if (inventory == null) return;
+
+        // Return if the inventory is empty
+        if (inventory.isEmpty()) return;
+
+        // Attempt to find a stack of matching items
+        for (int i = 0; i < inventory.main.size(); i++) {
+            if (i == inventory.selectedSlot) continue;
+
+            ItemStack stack = inventory.main.get(i);
+
+            if (stack.isOf(item)) {
+                // Simulate moving the stack from one slot to another
+                if (client != null) {
+                    client.interactionManager.clickSlot(player.currentScreenHandler.syncId, i, GLFW.GLFW_MOUSE_BUTTON_1, SlotActionType.PICKUP, player);
+
+                    // Wait 50 seconds (on another thread) before attempting to move the new stack
+                    // The magic number 36 is the offset to get the hotbar slotId
+                    scheduler.schedule(() -> {
+                        client.interactionManager.clickSlot(player.currentScreenHandler.syncId, inventory.selectedSlot + 36, GLFW.GLFW_MOUSE_BUTTON_1, SlotActionType.PICKUP, player);
+                    }, 50, TimeUnit.MILLISECONDS);
+                }
+
+                return;
+            }
+        }
+    }
+}

src/main/java/io/github/twokilohertz/mixin/BlockItemMixin.java

@@ -0,0 +1,32 @@
+package io.github.twokilohertz.mixin;
+
+import net.minecraft.item.BlockItem;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemPlacementContext;
+import net.minecraft.util.ActionResult;
+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 io.github.twokilohertz.HotbarReplace;
+
+@Mixin(BlockItem.class)
+public class BlockItemMixin {
+    private Item lastPlacedItem;
+
+    @Inject(at = @At("HEAD"), method = "Lnet/minecraft/item/BlockItem;place(Lnet/minecraft/item/ItemPlacementContext;)Lnet/minecraft/util/ActionResult;")
+    private void BlockItem_place_head(ItemPlacementContext context, CallbackInfoReturnable<ActionResult> info) {
+        lastPlacedItem = context.getStack().getItem();
+    }
+    @Inject(at = @At("TAIL"), method = "Lnet/minecraft/item/BlockItem;place(Lnet/minecraft/item/ItemPlacementContext;)Lnet/minecraft/util/ActionResult;")
+    private void mixin_BlockItem_place_tail(ItemPlacementContext context, CallbackInfoReturnable<ActionResult> info) {
+        // Early return if the block place action would fail
+        if (info.getReturnValue() != ActionResult.SUCCESS) return;
+
+        // Check if the stack is not empty, return if so
+        if (context.getStack().getCount() != 0) return;
+
+        // Try to replace the hotbar slot
+        HotbarReplace.tryReplaceSlot(context, lastPlacedItem);
+    }
+}

src/main/java/today/theladpack/hotbarreplace/HotbarReplace.java

@@ -1,21 +0,0 @@
-package today.theladpack.hotbarreplace;
-
-import net.fabricmc.api.ModInitializer;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-public class HotbarReplace implements ModInitializer {
-    // This logger is used to write text to the console and the log file.
-    // It is considered best practice to use your mod id as the logger's name.
-    // That way, it's clear which mod wrote info, warnings, and errors.
-    public static final Logger LOGGER = LoggerFactory.getLogger("hotbarreplace");
-
-    @Override
-    public void onInitialize() {
-        // This code runs as soon as Minecraft is in a mod-load-ready state.
-        // However, some things (like resources) may still be uninitialized.
-        // Proceed with mild caution.
-
-        LOGGER.info("Hello from the main class");
-    }
-}

src/main/java/today/theladpack/hotbarreplace/mixin/HotbarReplaceMixin.java

@@ -1,16 +0,0 @@
-package today.theladpack.hotbarreplace.mixin;
-
-import net.minecraft.client.gui.screen.TitleScreen;
-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;
-import today.theladpack.hotbarreplace.HotbarReplace;
-
-@Mixin(TitleScreen.class)
-public class HotbarReplaceMixin {
-    @Inject(at = @At("HEAD"), method = "init()V")
-    private void init(CallbackInfo info) {
-        HotbarReplace.LOGGER.info("Hello from the HotbarReplace mixin");
-    }
-}

src/main/resources/fabric.mod.json

@@ -9,8 +9,8 @@
     "Adam Macdonald"
   ],
   "contact": {
-    "homepage": "https://theladpack.today/",
-    "sources": "https://theladpack.today/"
+    "homepage": "https://twokilohertz.github.io/",
+    "sources": "https://twokilohertz.github.io/"
   },
 
   "license": "GPLv3",
@@ -19,7 +19,7 @@
   "environment": "*",
   "entrypoints": {
     "main": [
-      "today.theladpack.hotbarreplace.HotbarReplace"
+      "io.github.twokilohertz.HotbarReplace"
     ]
   },
   "mixins": [

src/main/resources/hotbarreplace.mixins.json

@@ -1,12 +1,12 @@
 {
   "required": true,
   "minVersion": "0.8",
-  "package": "today.theladpack.hotbarreplace.mixin",
+  "package": "io.github.twokilohertz.mixin",
   "compatibilityLevel": "JAVA_17",
   "mixins": [
   ],
   "client": [
-    "HotbarReplaceMixin"
+    "BlockItemMixin"
   ],
   "injectors": {
     "defaultRequire": 1