add friendly error message if non-deobf and the MekanismApi class is …

…loaded from the api jar

src/main/java/mekanism/client/ApiJarPresentException.java

@@ -0,0 +1,43 @@
+package mekanism.client;
+
+import net.minecraft.client.gui.FontRenderer;
+import net.minecraft.client.gui.GuiErrorScreen;
+import net.minecraftforge.fml.client.CustomModLoadingErrorDisplayException;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+/**
+ * Copied from EnderCore
+ */
+public class ApiJarPresentException extends CustomModLoadingErrorDisplayException
+{
+	private static final long serialVersionUID = 1L;
+
+	private final @Nonnull String[] msgs;
+
+	public ApiJarPresentException(@Nonnull String[] msgs) {
+		super(msgs[0], new RuntimeException());
+		this.msgs = msgs;
+	}
+
+	@Override
+	public void initGui(GuiErrorScreen errorScreen, FontRenderer fontRenderer) {
+	}
+
+	@Override
+	public void drawScreen(@Nullable GuiErrorScreen errorScreen, @Nullable FontRenderer fontRenderer, int mouseRelX, int mouseRelY, float tickTime) {
+		if (errorScreen == null || fontRenderer == null) {
+			return;
+		}
+		int y = errorScreen.height / 2 - msgs.length * 5;
+		for (String msg : msgs) {
+			if (msg != null) {
+				errorScreen.drawCenteredString(fontRenderer, msg, errorScreen.width / 2, y, 0xFFFFFF);
+				y += 10;
+			} else {
+				y += 5;
+			}
+		}
+	}
+}

src/main/java/mekanism/client/ClientProxy.java

@@ -1150,4 +1150,10 @@ public FontRenderer getFontRenderer()
 	{
 		return Minecraft.getMinecraft().fontRenderer;
 	}
+
+	@Override
+	public void throwApiPresentException()
+	{
+		throw new ApiJarPresentException(API_PRESENT_MESSAGE);
+	}
 }

src/main/java/mekanism/common/CommonProxy.java

@@ -708,4 +708,10 @@ public Object getFontRenderer()
 	{
 		return null;
 	}
+
+	protected final String[] API_PRESENT_MESSAGE = {"Mekanism API jar detected (Mekanism-<version>-api.jar),", "please delete it from your mods folder and restart the game."};
+
+	public void throwApiPresentException(){
+		throw new RuntimeException(String.join(" ", API_PRESENT_MESSAGE));
+	}
 }

src/main/java/mekanism/common/Mekanism.java

@@ -5,6 +5,7 @@
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
 import java.util.UUID;
@@ -106,6 +107,7 @@
 import net.minecraft.item.ItemStack;
 import net.minecraft.item.crafting.FurnaceRecipes;
 import net.minecraft.item.crafting.IRecipe;
+import net.minecraft.launchwrapper.Launch;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.tileentity.TileEntity;
 import net.minecraft.util.ResourceLocation;
@@ -701,6 +703,14 @@ public void loadComplete(FMLInterModComms.IMCEvent event)
 	@EventHandler
 	public void preInit(FMLPreInitializationEvent event)
 	{
+		//sanity check the api location if not deobf
+		if (!((Boolean) Launch.blackboard.get("fml.deobfuscatedEnvironment"))){
+			String apiLocation = MekanismAPI.class.getProtectionDomain().getCodeSource().getLocation().toString();
+			if (apiLocation.toLowerCase(Locale.ROOT).contains("-api.jar")){
+				proxy.throwApiPresentException();
+			}
+		}
+
 		File config = event.getSuggestedConfigurationFile();
 
 		//Set the mod's configuration