aspect GenerateMainClassScript {
	public void Program.generateMainClassScript() {
		if (!(options().hasValueForOption(jastadd.JastAddModules.MAIN_CLASS_OPTION))) {
			return;
		}
		String mainClassName = options().getValueForOption(jastadd.JastAddModules.MAIN_CLASS_OPTION);
		String unmodifiedMainClassName = mainClassName;
		String mainModuleQualifier = "";
		int index = mainClassName.lastIndexOf(Program.MODULE_SEPARATOR);
		if (index != -1) {
			mainModuleQualifier = mainClassName.substring(0, index);
			mainClassName = mainClassName.substring(index+2); 
		}
		String mainPackageQualifier = "";
		index = mainClassName.lastIndexOf(".");
		if (index != -1) {
			mainPackageQualifier = mainClassName.substring(0,index);
			mainClassName = mainClassName.substring(index+1);
		}
		ModuleCompilationUnit context = getInstanceModuleCU().lookupModule(mainModuleQualifier);
		if (context == null) {
			System.err.println("Unable to find main class " + unmodifiedMainClassName +
								", discontinuing script generation.");
			return;
		}
		SimpleSet mainTypes = context.moduleLookupType(mainPackageQualifier, mainClassName, false);
		if (mainTypes.isEmpty()) {
			System.err.println("Unable to find main class " + unmodifiedMainClassName +
								", discontinuing script generation.");
			return;
		}
		Iterator<TypeDecl> iter = mainTypes.iterator();
		TypeDecl mainType = iter.next();
		
		//write the script
		try {
			String outdir = "";
			if (options().hasValueForOption("-d")) {
				outdir = options().getValueForOption("-d") + java.io.File.separator; 
			}
			String classpath = ".";
			if (options().hasValueForOption("-classpath")) {
				classpath = options().getValueForOption("-classpath") + java.io.File.pathSeparator + ".";  
			}
			
			FileOutputStream fileout = new FileOutputStream(outdir + "run");
			PrintWriter out = new PrintWriter(fileout);
			String mainFullName = mainType.packageName() + "." + mainType.name();
			StringBuffer fixedMainFullName = new StringBuffer();
			for (int i = 0; i < mainFullName.length(); i++) {
				if (mainFullName.charAt(i) == '$') {
					fixedMainFullName.append("\\$");
				} else {
					fixedMainFullName.append(mainFullName.charAt(i));
				}
			}
			out.print("java -cp \"" + classpath + "\" \"" + fixedMainFullName.toString() + "\"");
			out.close();
		}
		catch (Exception e) {
			System.err.println("Error writing script file: " + e.getMessage());
		}
	}
}