From 10ce71efe3d264a8df80185c4774abd30ceab521 Mon Sep 17 00:00:00 2001
From: Jonas Herzig <me@johni0702.de>
Date: Fri, 27 Oct 2017 14:21:12 +0200
Subject: [PATCH] Fix mapwriter crash when opening replay for <MC1.12 (fixes
 #96)

---
 .../mapwriter/mixin/MixinMinecraft.java       | 35 +++++++++++++++++++
 .../com/replaymod/core/LoadingPlugin.java     |  1 +
 .../mixins.compat.mapwriter.replaymod.json    | 11 ++++++
 3 files changed, 47 insertions(+)
 create mode 100644 src/main/java/com/replaymod/compat/mapwriter/mixin/MixinMinecraft.java
 create mode 100644 src/main/resources/mixins.compat.mapwriter.replaymod.json

diff --git a/src/main/java/com/replaymod/compat/mapwriter/mixin/MixinMinecraft.java b/src/main/java/com/replaymod/compat/mapwriter/mixin/MixinMinecraft.java
new file mode 100644
index 00000000..6347c057
--- /dev/null
+++ b/src/main/java/com/replaymod/compat/mapwriter/mixin/MixinMinecraft.java
@@ -0,0 +1,35 @@
+package com.replaymod.compat.mapwriter.mixin;
+
+import com.replaymod.replay.ReplayModReplay;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.multiplayer.ServerData;
+import net.minecraftforge.fml.common.Loader;
+import org.spongepowered.asm.mixin.Mixin;
+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.CallbackInfoReturnable;
+
+/**
+ * Approximately this for <1.12: https://github.com/Vectron/mapwriter/commit/68234520c7a3a0ae8201a085d7e66369900586ac
+ */
+@Mixin(Minecraft.class)
+public abstract class MixinMinecraft {
+
+    @Shadow
+    private ServerData currentServerData;
+
+    @Inject(method = "getCurrentServerData", cancellable = true, at = @At("HEAD"))
+    private void replayModCompat_fixBug96(CallbackInfoReturnable<ServerData> ci) {
+        if (currentServerData == null
+                && (Loader.isModLoaded("mapwriter") || Loader.isModLoaded("MapWriter"))
+                && ReplayModReplay.instance.getReplayHandler() != null) {
+            for (StackTraceElement elem : Thread.currentThread().getStackTrace()) {
+                if ("mapwriter.util.Utils".equals(elem.getClassName()) && "getWorldName".equals(elem.getMethodName())) {
+                    ci.setReturnValue(new ServerData(null, "replay"));
+                    return;
+                }
+            }
+        }
+    }
+}
diff --git a/src/main/java/com/replaymod/core/LoadingPlugin.java b/src/main/java/com/replaymod/core/LoadingPlugin.java
index 9a251ed9..ebc8df0b 100755
--- a/src/main/java/com/replaymod/core/LoadingPlugin.java
+++ b/src/main/java/com/replaymod/core/LoadingPlugin.java
@@ -19,6 +19,7 @@ public class LoadingPlugin implements IFMLLoadingPlugin {
         Mixins.addConfiguration("mixins.recording.replaymod.json");
         Mixins.addConfiguration("mixins.render.replaymod.json");
         Mixins.addConfiguration("mixins.replay.replaymod.json");
+        Mixins.addConfiguration("mixins.compat.mapwriter.replaymod.json");
         Mixins.addConfiguration("mixins.compat.shaders.replaymod.json");
         Mixins.addConfiguration("mixins.extras.playeroverview.replaymod.json");
 
diff --git a/src/main/resources/mixins.compat.mapwriter.replaymod.json b/src/main/resources/mixins.compat.mapwriter.replaymod.json
new file mode 100644
index 00000000..4b5d0287
--- /dev/null
+++ b/src/main/resources/mixins.compat.mapwriter.replaymod.json
@@ -0,0 +1,11 @@
+{
+  "required": false,
+  "package": "com.replaymod.compat.mapwriter.mixin",
+  "mixins": [],
+  "server": [],
+  "client": [
+    "MixinMinecraft"
+  ],
+  "compatibilityLevel": "JAVA_8",
+  "refmap": "mixins.replaymod.refmap.json"
+}
\ No newline at end of file