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App.scala
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App.scala
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package caseapp
import language.reflectiveCalls
import scala.reflect.runtime.universe.{ Try => _, _ }
import scala.util.{ Success, Failure }
import scala.collection.mutable.ListBuffer
trait ArgsApp {
private[caseapp] def setRemainingArgs(remainingArgs: Seq[String]): Unit
def remainingArgs: Seq[String]
def apply(): Unit
}
/*
* DelayedInit à la scala.App
* Using it in spite of https://github.com/scala/scala/pull/3563
*/
trait App extends ArgsApp with DelayedInit {
private val initCode = new ListBuffer[() => Unit]
private var _remainingArgs = Seq.empty[String]
private[caseapp] def setRemainingArgs(remainingArgs: Seq[String]): Unit = {
_remainingArgs = remainingArgs
}
def remainingArgs: Seq[String] = _remainingArgs
override def delayedInit(body: => Unit): Unit = {
initCode += (() => body)
}
def apply(): Unit = {
for (proc <- initCode)
proc()
}
}
abstract class AppOf[C <: ArgsApp] {
/*
* See https://issues.scala-lang.org/browse/SI-5000
* and https://issues.scala-lang.org/browse/SI-7666
*/
final def me(implicit parser: Parser[WithHelp[C]], messages: Messages[C]): (Parser[WithHelp[C]], Messages[C]) =
(parser, messages)
def ignore: (Parser[WithHelp[C]], Messages[C])
private lazy val (_parser, _messages) = ignore
def main(args: Array[String]): Unit =
_parser(args.toList) match {
case Success((a, remaining)) =>
a.setRemainingArgs(remaining)
a()
case Failure(t: IllegalArgumentException) =>
Console.err.println(s"Illegal argument: ${t.getMessage}")
Console.err.println(_messages.usageMessage)
sys exit 1
case Failure(t) =>
Console.err.println(t)
sys exit 1
}
}