Fix mapwriter crash when opening replay for <MC1.12 (fixes #96)

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;
+                }
+            }
+        }
+    }
+}

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");
 

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"
+}