A command line argument parser for Java 17 with
ease of use and high customization possibilities in mind.

Example

• First, we define our Command by creating a Command Template.

   @Command.Define
   class MyProgram {
   	@Argument.Define(required = true, positional = true, description = "The name of the user.")
   	public String name;
   
   	@Argument.Define(type = String.class, description = "The surname of the user.")
   	public Optional<String> surname;
   
   	@Argument.Define(names = {"age", "a"}, description = "The age of the user.", prefix = Argument.Prefix.PLUS)
   	public int age = 18;
   	
   	@InitDef
   	public static void beforeInit(@NotNull CommandBuildContext ctx) {
   		// configure the argument "age" to have an argument type of
   		// number range and set the range to 1-100
   		ctx.argWithType("age", new NumberRangeArgumentType<>(18, 100))
   			.onOk(v -> System.out.println("The age is valid!"));
   	}
   }

• Then, let that class definition also serve as the container for the parsed values.

   public static void main(String[] args) {
   	// example: david +a20
   	var myProgram = ArgumentParser.parseFromInto(MyProgram.class, args);
   	
   	System.out.printf(
   		"Welcome %s! You are %d years old.%n",
   		myProgram.name, myProgram.age
   	);
  
   	// if no surname was specified, we'll show "none" instead
   	System.out.printf("The surname of the user is %s.%n", myProgram.surname.orElse("none"));
   }

Documentation

Check out the website for more information.

Click here to get started with Lanat, and to check out the full documentation of the latest stable version.

Javadocs for the latest stable version is available here.