config button!

src/main/java/fathertoast/specialmobs/client/ClientEventHandler.java

@@ -0,0 +1,47 @@
+package fathertoast.specialmobs.client;
+
+import fathertoast.specialmobs.common.config.Config;
+import fathertoast.specialmobs.common.core.SpecialMobs;
+import mcp.MethodsReturnNonnullByDefault;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.screen.Screen;
+import net.minecraft.util.Util;
+import net.minecraft.util.text.StringTextComponent;
+import net.minecraftforge.api.distmarker.Dist;
+import net.minecraftforge.client.event.GuiOpenEvent;
+import net.minecraftforge.eventbus.api.SubscribeEvent;
+import net.minecraftforge.fml.ExtensionPoint;
+import net.minecraftforge.fml.ModLoadingContext;
+import net.minecraftforge.fml.common.Mod;
+
+import javax.annotation.ParametersAreNonnullByDefault;
+
+@ParametersAreNonnullByDefault
+@MethodsReturnNonnullByDefault
+@Mod.EventBusSubscriber( value = Dist.CLIENT, modid = SpecialMobs.MOD_ID, bus = Mod.EventBusSubscriber.Bus.FORGE )
+public class ClientEventHandler {
+    
+    static void registerConfigGUIFactory() {
+        ModLoadingContext.get().registerExtensionPoint( ExtensionPoint.CONFIGGUIFACTORY,
+                () -> ClientEventHandler.OpenConfigFolderScreen::new );
+    }
+    
+    @SubscribeEvent
+    public static void onGuiOpen( GuiOpenEvent event ) {
+        if( event.getGui() instanceof OpenConfigFolderScreen ) {
+            event.setCanceled( true );
+            Util.getPlatform().openFile( Config.CONFIG_DIR );
+        }
+    }
+    
+    /**
+     * This screen is effectively a redirect. It is opened when the "mod config" button is pressed with the goal of behaving
+     * like the "mods folder" button; i.e. just opens the appropriate folder.
+     */
+    private static class OpenConfigFolderScreen extends Screen {
+        private OpenConfigFolderScreen( Minecraft game, Screen parent ) {
+            // We don't need to localize the name or do anything since the opening of this screen is always canceled
+            super( new StringTextComponent( "Opening mod config folder" ) );
+        }
+    }
+}

src/main/java/fathertoast/specialmobs/client/ClientRegister.java

@@ -23,6 +23,7 @@ public class ClientRegister {
     
     @SubscribeEvent
     public static void onClientSetup( FMLClientSetupEvent event ) {
+        ClientEventHandler.registerConfigGUIFactory();
         registerEntityRenderers();
     }