scala import org.mainargs._ object MyApp extends App { @main def run( @arg(required = true) input: String, @arg(default = 10) count: Int, @arg(required = false) output: String ): Unit = { println(s"Input file: $input") println(s"Count: $count") println(s"Output file: $output") } ParserForMethods(this).runOrExit(args) }