Add left handed override for hypixel

src/main/java/moe/nea/firmament/mixins/PlayerLeftHandedPatch.java

@@ -0,0 +1,27 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Linnea Gräf <nea@nea.moe>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package moe.nea.firmament.mixins;
+
+import moe.nea.firmament.features.fixes.Fixes;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.util.Arm;
+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;
+
+@Mixin(PlayerEntity.class)
+public class PlayerLeftHandedPatch {
+    @Inject(
+        method = "getMainArm",
+        at = @At("HEAD"),
+        cancellable = true
+    )
+    public void onGetMainArm(CallbackInfoReturnable<Arm> cir) {
+        Fixes.INSTANCE.isLeftHandedHook((PlayerEntity) (Object) this, cir);
+    }
+}

src/main/kotlin/moe/nea/firmament/features/fixes/Fixes.kt

@@ -6,16 +6,19 @@
 
 package moe.nea.firmament.features.fixes
 
+import moe.nea.jarvis.api.Point
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable
+import net.minecraft.client.MinecraftClient
+import net.minecraft.client.option.KeyBinding
+import net.minecraft.entity.player.PlayerEntity
+import net.minecraft.text.Text
+import net.minecraft.util.Arm
 import moe.nea.firmament.events.HudRenderEvent
 import moe.nea.firmament.events.WorldKeyboardEvent
 import moe.nea.firmament.features.FirmamentFeature
 import moe.nea.firmament.gui.config.ManagedConfig
 import moe.nea.firmament.util.MC
-import moe.nea.jarvis.api.Point
+import moe.nea.firmament.util.errorBoundary
-import net.minecraft.client.MinecraftClient
-import net.minecraft.client.option.KeyBinding
-import net.minecraft.text.Text
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable
 
 object Fixes : FirmamentFeature {
     override val identifier: String
@@ -27,6 +30,7 @@ object Fixes : FirmamentFeature {
         val autoSprintKeyBinding by keyBindingWithDefaultUnbound("auto-sprint-keybinding")
         val autoSprintHud by position("auto-sprint-hud", 80, 10) { Point(0.0, 1.0) }
         val peekChat by keyBindingWithDefaultUnbound("peek-chat")
+        val useClientSidedHandedness by toggle("clientside-lefthand") { true }
     }
 
     override val config: ManagedConfig
@@ -40,6 +44,12 @@ object Fixes : FirmamentFeature {
             cir.returnValue = true
     }
 
+    fun isLeftHandedHook(entity: PlayerEntity, cit: CallbackInfoReturnable<Arm>) = errorBoundary {
+        if (TConfig.useClientSidedHandedness && entity.isMainPlayer) {
+            cit.returnValue = MC.instance.options.mainArm.value
+        }
+    }
+
     override fun onLoad() {
         WorldKeyboardEvent.subscribe {
             if (it.matches(TConfig.autoSprintKeyBinding)) {

src/main/kotlin/moe/nea/firmament/util/ErrorBoundary.kt

@@ -0,0 +1,14 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Linnea Gräf <nea@nea.moe>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package moe.nea.firmament.util
+
+
+fun <T> errorBoundary(block: () -> T): T? {
+    // TODO: implement a proper error boundary here to avoid crashing minecraft code
+    return block()
+}
+