ZIO learning - zio cli / published by https://github.com/dacr/code-examples-manager #e84b545b-7828-42ee-ad84-54fdfc3d001c/833d283b97772f6c27cc1acb70b14cc75af0c844

zio-learning-cli-1.sc

// summary : ZIO learning - zio cli
// keywords : scala, zio, learning, pure-functional, cli, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : e84b545b-7828-42ee-ad84-54fdfc3d001c
// created-on : 2021-12-29T19:12:47+01:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala "3.4.2"
//> using dep "dev.zio::zio:2.0.13"
//> using dep "dev.zio::zio-cli:0.4.0"
// ---------------------

import zio.*
import zio.cli.*
import zio.cli.HelpDoc.Span.text

sealed trait Subcommand
object Subcommand {
  final case class Something(verbose: Boolean) extends Subcommand
}

object Encapsulated extends App {

  val verboseFlag: Options[Boolean] = Options.boolean("verbose").alias("v")

  val somethingHelp: HelpDoc = HelpDoc.p("something description")

  val something = Command("something", verboseFlag, Args.none).withHelp(somethingHelp).map { verbose =>
    Subcommand.Something(verbose)
  }

  val cmd: Command[Subcommand] =
    Command("app", Options.none, Args.none)
      .subcommands(something)

  val helloApp = CliApp.make(
    name = "Command Line App",
    version = "0.1.1",
    summary = text("just an application"),
    command = cmd
  ) { case Subcommand.Something(verbose) =>
    Console.printLine(s"Executing something with verbose=$verbose")
  }

  def run(args: List[String]) =
    helloApp.run(args)
}

// ---------------------------------------------------------------------------------
Encapsulated.main(Array("something", "--verbose"))
Encapsulated.main(Array.empty)