Add a warning when KAMI Blue is detected

src/main/java/com/lambda/client/mixin/client/gui/MixinGuiMainMenu.java

@@ -1,7 +1,9 @@
 package com.lambda.client.mixin.client.gui;
 
 import com.lambda.client.LambdaMod;
+import com.lambda.client.gui.mc.LambdaGuiIncompat;
 import com.lambda.client.module.modules.client.MenuShader;
+import com.lambda.client.util.KamiCheck;
 import com.lambda.client.util.WebUtils;
 import net.minecraft.client.gui.FontRenderer;
 import net.minecraft.client.gui.GuiMainMenu;
@@ -27,6 +29,10 @@ public abstract class MixinGuiMainMenu extends GuiScreen {
 
     @Inject(method = "drawScreen", at = @At("RETURN"))
     public void drawScreen$Inject$RETURN(int mouseX, int mouseY, float partialTicks, CallbackInfo ci) {
+        if (KamiCheck.INSTANCE.isKami() && !KamiCheck.INSTANCE.getDidDisplayWarning()) {
+            KamiCheck.INSTANCE.setDidDisplayWarning(true);
+            mc.displayGuiScreen(new LambdaGuiIncompat());
+        }
         FontRenderer fr = fontRenderer;
         String slogan = TextFormatting.WHITE + LambdaMod.NAME + " " + TextFormatting.GRAY + LambdaMod.VERSION;
         String version;

src/main/kotlin/com/lambda/client/LambdaMod.kt

@@ -3,6 +3,7 @@ package com.lambda.client
 import com.lambda.client.event.ForgeEventProcessor
 import com.lambda.client.gui.clickgui.LambdaClickGui
 import com.lambda.client.util.ConfigUtils
+import com.lambda.client.util.KamiCheck
 import com.lambda.client.util.WebUtils
 import com.lambda.client.util.threads.BackgroundScope
 import net.minecraftforge.common.MinecraftForge
@@ -75,6 +76,8 @@ class LambdaMod {
         WebUtils.updateCheck()
         LambdaClickGui.populateRemotePlugins()
 
+        KamiCheck.runCheck()
+
         LOG.info("$NAME initialized!")
     }
 

src/main/kotlin/com/lambda/client/gui/mc/LambdaGuiIncompat.kt

@@ -0,0 +1,38 @@
+package com.lambda.client.gui.mc
+
+import net.minecraft.client.gui.GuiButton
+import net.minecraft.client.gui.GuiMainMenu
+import net.minecraft.client.gui.GuiOptionButton
+import net.minecraft.client.gui.GuiScreen
+import net.minecraft.client.resources.I18n
+
+class LambdaGuiIncompat : GuiScreen() {
+
+    override fun initGui() {
+        buttonList.clear()
+        // I used the minecraft "Out of Memory" class as a reference, turns out it has exactly the buttons I need, with internationalization support too
+        buttonList.add(GuiOptionButton(0, width / 2 - 155, height / 4 + 120, I18n.format("gui.toTitle", *arrayOfNulls(0))))
+        buttonList.add(GuiOptionButton(1, width / 2 - 155 + 160, height / 4 + 120, I18n.format("menu.quit", *arrayOfNulls(0))))
+    }
+
+    override fun actionPerformed(button: GuiButton) {
+        if (button.id == 0) {
+            mc.displayGuiScreen(GuiMainMenu())
+        } else if (button.id == 1) {
+            mc.shutdown()
+        }
+    }
+
+    override fun drawScreen(mouseX: Int, mouseY: Int, partialTicks: Float) {
+        drawDefaultBackground()
+        drawCenteredString(fontRenderer, "Found KAMI Blue!", width / 2, height / 4 - 60 + 20, 16777215)
+        drawString(fontRenderer, "It appears you are using KAMI Blue alongside Lambda Client.", width / 2 - 140, height / 4 - 60 + 60 + 0, 10526880)
+        drawString(fontRenderer, "Lambda Client is a continued version of KAMI Blue,", width / 2 - 140, height / 4 - 60 + 60 + 18, 10526880)
+        drawString(fontRenderer, "and is not compatible as a result.", width / 2 - 140, height / 4 - 60 + 60 + 27, 10526880)
+        drawString(fontRenderer, "It is not recommended to use both clients", width / 2 - 140, height / 4 - 60 + 60 + 45, 10526880)
+        drawString(fontRenderer, "together, since many modules will override each other.", width / 2 - 140, height / 4 - 60 + 60 + 54, 10526880)
+        drawString(fontRenderer, "You may continue, but it may cause serious issues,", width / 2 - 140, height / 4 - 60 + 60 + 63, 10526880)
+        drawString(fontRenderer, "and support will not be provided to dual users.", width / 2 - 140, height / 4 - 60 + 60 + 72, 10526880)
+        super.drawScreen(mouseX, mouseY, partialTicks)
+    }
+}

src/main/kotlin/com/lambda/client/util/KamiCheck.kt

@@ -0,0 +1,16 @@
+package com.lambda.client.util
+
+import com.lambda.client.LambdaMod
+import java.net.URL
+
+object KamiCheck {
+    var isKami: Boolean = false
+    var didDisplayWarning: Boolean = false
+    fun runCheck() {
+        val kamiCheckList: List<URL> = this.javaClass.classLoader.getResources("org/kamiblue/client/KamiMod.class").toList()
+        if (kamiCheckList.isNotEmpty()) {
+            LambdaMod.LOG.error("KAMI Blue detected!")
+            isKami = true
+        }
+    }
+}