command line options parser / published by https://github.com/dacr/code-examples-manager #f562bfbe-4bdc-4e1c-88e3-f891264c348e/9a399af735ebc61dc522a7666d9c0656dac9b400

cmdline-parser.sc

// summary : command line options parser
// keywords : scala, script, commandline, parser, helloworld
// publish : gist
// authors : David Crosson
// license : Apache License Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0.txt)
// id : f562bfbe-4bdc-4e1c-88e3-f891264c348e
// created-on : 2019-11-13T20:13:56Z
// managed-by : https://github.com/dacr/code-examples-manager
// execution : scala ammonite script (http://ammonite.io/) - run as follow 'amm scriptname.sc'

// inspired from http://ben.kirw.in/decline/

import $ivy.`com.monovore::decline:1.0.0`
import cats.implicits._
import com.monovore.decline._


object HelloWorld extends CommandApp(
  name = "hello-world",
  header = "Says hello!",
  main = {
    val userOpt =
      Opts.option[String]("target", help = "Person to greet.").withDefault("world")

    val quietOpt = Opts.flag("quiet", help = "Whether to be quiet.").orFalse

    (userOpt, quietOpt).mapN { (user, quiet) =>
      if (quiet) println("...")
      else println(s"Hello $user!")
    }
  }
)


@main
def main(args: String*):Unit = HelloWorld.main(args.toArray)