wvlet.airframe.launcher

class MyCommand(@option(prefix="-h,--help", description="display help", isHelp=true) help:Boolean) {
 @command(description="Say hello")
 def hello(@option(prefix="-r", description="repeat times")
           repeat:Int=1,
           @argument
           message:String = "hello") {
     for(i <- 0 until repeat) println(message)
 }
}

Launcher.execute[MyCommand]("hello -r 3")  // hello x 3

A(a, B(b, c))

{ a: apple, B:{b:book, c:car} }

val n1 = EmptyNode.set("a", apple) => Node(a -> Leaf(apple))
val n2 = n1.set("B.b", "book") => Node(a -> Leaf(apple), B -> EmptyNode.set("b", "book")) => Node(a -> apple, B -> Node(b -> Leaf(book)))
val n3 = n2.set("B.c", "car") => Node(a -> apple, B -> Node(b -> Leaf(book), c -> Leaf(car)))