Add ToolEfficiencyProvider

src/main/java/org/dimdev/rift/listener/ToolEfficiencyProvider.java

@@ -0,0 +1,10 @@
+package org.dimdev.rift.listener;
+
+import net.minecraft.block.Block;
+import net.minecraft.item.ItemTool;
+
+import java.util.Set;
+
+public interface ToolEfficiencyProvider {
+    void addEffectiveBlocks(ItemTool tool, Set<Block> target);
+}

src/main/java/org/dimdev/rift/mixin/hook/MixinItemTool.java

@@ -0,0 +1,32 @@
+package org.dimdev.rift.mixin.hook;
+
+import net.minecraft.block.Block;
+import net.minecraft.item.IItemTier;
+import net.minecraft.item.Item;
+import net.minecraft.item.ItemTool;
+import org.dimdev.rift.listener.ToolEfficiencyProvider;
+import org.dimdev.riftloader.RiftLoader;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Mutable;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.HashSet;
+import java.util.Set;
+
+@Mixin(ItemTool.class)
+public class MixinItemTool {
+    @Shadow @Mutable @Final private Set<Block> effectiveBlocks;
+
+    @Inject(method = "<init>", at = @At("RETURN"))
+    private void onInit(float attackDamage, float attackSpeed, IItemTier tier, Set<Block> effectiveBlocks, Item.Builder builder, CallbackInfo ci) {
+        this.effectiveBlocks = new HashSet<>(effectiveBlocks);
+
+        for (ToolEfficiencyProvider toolEfficiencyProvider : RiftLoader.instance.getListeners(ToolEfficiencyProvider.class)) {
+            toolEfficiencyProvider.addEffectiveBlocks((ItemTool) (Object) this, this.effectiveBlocks);
+        }
+    }
+}

src/main/java/org/dimdev/riftloader/RiftLoader.java

@@ -42,8 +42,6 @@ public class RiftLoader {
     private InstanceListMap customListenerInstances = new InstanceListMap();
 
     public void load(boolean isClient) {
-        if (RiftLoader.instance.getSide() == Side.SERVER)
-
         if (loaded) {
             throw new IllegalStateException("Already loaded");
         }

src/main/resources/mixins.rift.hooks.json

@@ -37,7 +37,8 @@
     "MixinChunk",
     "MixinRecipeManager",
     "MixinRecipeSerializers",
-    "MixinArgumentTypes"
+    "MixinArgumentTypes",
+    "MixinItemTool"
   ],
   "client": [
     "client.MixinMinecraft",