Added support for Minecraft Classic !

build.gradle

@@ -12,7 +12,7 @@ repositories {
 group = 'net.minecraft'
 archivesBaseName = 'launchwrapper'
 version = '1.12'
-sourceCompatibility = 1.6
+sourceCompatibility = 1.8
 
 dependencies {
     compile 'net.sf.jopt-simple:jopt-simple:4.5'

src/main/java/net/minecraft/launchwrapper/ClassicVanillaTweaker.java

@@ -0,0 +1,42 @@
+package net.minecraft.launchwrapper;
+
+import java.io.File;
+import java.util.List;
+
+import org.apache.logging.log4j.Level;
+
+import net.minecraft.launchwrapper.injector.ClassicVanillaTweakInjector;
+
+public class ClassicVanillaTweaker implements ITweaker {
+
+	private static final String TWEAK_INJECTOR_CLASS = ClassicVanillaTweakInjector.class.getName();
+	private List<String> arguments;
+
+	@Override
+	public void acceptOptions(List<String> args, File gameDir, File assetsDir, String profile) {
+		arguments = args;
+		ClassicVanillaTweakInjector.minecraftPath = gameDir;
+		// Checking if we have enabled survival mode and announcing it.
+		ClassicVanillaTweakInjector.enableSurvivalPatch = args.contains("--survival");
+
+		if (ClassicVanillaTweakInjector.enableSurvivalPatch)
+			LogWrapper.log(Level.INFO, "Will enable surival patch.");
+	}
+
+	@Override
+	public void injectIntoClassLoader(LaunchClassLoader classLoader) {
+		classLoader.registerTransformer(TWEAK_INJECTOR_CLASS);
+
+	}
+
+	@Override
+	public String getLaunchTarget() {
+		return TWEAK_INJECTOR_CLASS;
+	}
+
+	@Override
+	public String[] getLaunchArguments() {
+		return arguments.toArray(new String[arguments.size()]);
+	}
+
+}