Add chat message event

src/client/java/nl/devpieter/utilize/client/events/chat/ChatMessageAddEvent.java

@@ -0,0 +1,28 @@
+package nl.devpieter.utilize.client.events.chat;
+
+import net.minecraft.network.chat.Component;
+import nl.devpieter.sees.event.SCancelableEventBase;
+import nl.devpieter.sees.event.SReturnableEvent;
+
+public class ChatMessageAddEvent extends SCancelableEventBase implements SReturnableEvent<Component> {
+
+    private Component message;
+
+    public ChatMessageAddEvent(Component message) {
+        this.message = message;
+    }
+
+    @Override
+    public Component getResult() {
+        return this.message;
+    }
+
+    @Override
+    public void setResult(Component message) {
+        this.message = message;
+    }
+
+    public Component message() {
+        return this.message;
+    }
+}

src/client/java/nl/devpieter/utilize/client/mixin/ChatHudMixin.java

@@ -0,0 +1,30 @@
+package nl.devpieter.utilize.client.mixin;
+
+import net.minecraft.client.gui.components.ChatComponent;
+import net.minecraft.network.chat.Component;
+import nl.devpieter.sees.Sees;
+import nl.devpieter.utilize.client.events.chat.ChatMessageAddEvent;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.ModifyVariable;
+
+@Mixin(ChatComponent.class)
+public abstract class ChatHudMixin {
+
+    @Unique
+    private final Sees sees = Sees.getSharedInstance();
+
+    @ModifyVariable(
+            method = "addMessage(Lnet/minecraft/network/chat/Component;Lnet/minecraft/network/chat/MessageSignature;Lnet/minecraft/client/multiplayer/chat/GuiMessageSource;Lnet/minecraft/client/multiplayer/chat/GuiMessageTag;)V",
+            at = @At("HEAD"),
+            argsOnly = true,
+            name = "contents"
+    )
+    private Component onAddMessage(Component contents) {
+        ChatMessageAddEvent event = new ChatMessageAddEvent(contents);
+        Component result = sees.dispatchWithResult(event);
+
+        return event.isCancelled() ? contents : result;
+    }
+}

src/client/resources/utilize.client.mixins.json

@@ -13,6 +13,7 @@
   },
   "mixins": [
     "KeyMappingMixin",
+    "ChatHudMixin",
     "LocalPlayerMixin",
     "MinecraftMixin"
   ]