From 33ece210f588d865ed228bb4b1012ecf20170f1a Mon Sep 17 00:00:00 2001
From: alemi <me@alemi.dev>
Date: Mon, 20 Mar 2023 23:28:27 +0100
Subject: chore: initial work on a better chat patch

---
 src/main/java/ftbsc/bscv/modules/hud/Terminal.java | 21 +++++++++++
 src/main/java/ftbsc/bscv/patches/ChatPatch.java    | 42 +++++++++++++++++++---
 2 files changed, 59 insertions(+), 4 deletions(-)
 create mode 100644 src/main/java/ftbsc/bscv/modules/hud/Terminal.java

diff --git a/src/main/java/ftbsc/bscv/modules/hud/Terminal.java b/src/main/java/ftbsc/bscv/modules/hud/Terminal.java
new file mode 100644
index 0000000..432f78b
--- /dev/null
+++ b/src/main/java/ftbsc/bscv/modules/hud/Terminal.java
@@ -0,0 +1,21 @@
+package ftbsc.bscv.modules.hud;
+
+import ftbsc.bscv.modules.AbstractModule;
+import ftbsc.bscv.tools.Setting;
+import net.minecraftforge.common.ForgeConfigSpec;
+
+public class Terminal extends AbstractModule {
+
+	public final ForgeConfigSpec.ConfigValue<Integer> msg_count;
+
+	public Terminal() {
+		super();
+
+		this.msg_count = Setting.Number.builder()
+			.min(-1)
+			.fallback(100)
+			.name("msg-count")
+			.comment("How many messages to keep in chat, set to 0 for unlimited")
+			.build(this);
+	}
+}
diff --git a/src/main/java/ftbsc/bscv/patches/ChatPatch.java b/src/main/java/ftbsc/bscv/patches/ChatPatch.java
index 0441c28..7ec733d 100644
--- a/src/main/java/ftbsc/bscv/patches/ChatPatch.java
+++ b/src/main/java/ftbsc/bscv/patches/ChatPatch.java
@@ -1,12 +1,21 @@
 package ftbsc.bscv.patches;
 
+import ftbsc.bscv.modules.hud.Terminal;
+import ftbsc.lll.processor.annotations.Find;
 import ftbsc.lll.processor.annotations.Injector;
 import ftbsc.lll.processor.annotations.Patch;
 import ftbsc.lll.processor.annotations.Target;
+import ftbsc.lll.proxies.FieldProxy;
 import ftbsc.lll.tools.InsnSequence;
 import ftbsc.lll.tools.PatternMatcher;
+import ftbsc.lll.tools.debug.BytecodePrinter;
 import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.NewChatGui;
 import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.util.text.ITextComponent;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.eventbus.api.Event;
+import net.minecraftforge.eventbus.api.Cancelable;
 
 import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.tree.*;
@@ -14,6 +23,13 @@ import org.objectweb.asm.tree.*;
 
 public class ChatPatch {
 
+	@Cancelable
+	public static class ClearChatEvent extends Event {}
+
+	public static boolean shouldPreventChatClearing() {
+		return MinecraftForge.EVENT_BUS.post(new ClearChatEvent());
+	}
+
 	@Patch(value = Minecraft.class, reason = "add hook to prevent chat from being cleared")
 	public abstract static class ChatClearInterceptor implements Opcodes {
 
@@ -23,21 +39,39 @@ public class ChatPatch {
 		abstract void setScreen(Screen screen);
 
 		@Injector
-		public void inject(ClassNode clazz, MethodNode main) {
+		public void inject(ClassNode clazz, MethodNode method) {
 			InsnSequence match = PatternMatcher.builder()
 				.opcodes(ALOAD, GETFIELD, INVOKEVIRTUAL, ICONST_1, INVOKEVIRTUAL)
 				.ignoreLineNumbers()
 				.ignoreLabels()
 				.ignoreFrames()
 				.build()
-				.find(main);
+				.find(method);
 
 			LabelNode skip = new LabelNode();
+
 			JumpInsnNode jump = new JumpInsnNode(GOTO, skip);
 
-			main.instructions.insertBefore(match.getFirst(), jump);
-			main.instructions.insert(match.getLast(), skip);
+			method.instructions.insertBefore(match.getFirst(), jump);
+			method.instructions.insert(match.getLast(), skip);
 		}
 	}
 
+	@Patch(value = NewChatGui.class, reason = "make max number of messages in chat configurable (instead of just 100)")
+	public abstract static class ChatHistoryRemoveInterceptor implements Opcodes {
+
+		@Target
+		abstract void addMessage(ITextComponent txt, int idk1, int idk2, boolean idk3);
+
+		@Find(parent = Terminal.class)
+		abstract FieldProxy msg_count();
+
+		@Injector
+		public void inject(ClassNode clazz, MethodNode method) {
+			InsnSequence match = PatternMatcher.builder()
+				.opcodes(ALOAD, ICONST_2, INVOKESPECIAL, INVOKEINTERFACE, GOTO)
+				.build()
+				.find(method);
+		}
+	}
 }
-- 
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