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package scalevalapokalypsi.Client
import scala.concurrent.Future
import scala.concurrent.ExecutionContext.Implicits.global
import scala.io.StdIn.readLine
import scala.util.{Try, Success, Failure}
/** This class is for taking new lines from stdin when they are available.
* reading starts when either newLine or clear or startReading are called.
*/
class StdinLineReader:
private var nextLine: Future[String] = Future.failed(Exception())
/** Returns a new line of input if there are any. */
def newLine(): Option[String] =
this.nextLine.value match
case Some(Success(s)) =>
this.startReading()
Some(s)
case Some(Failure(e)) =>
this.startReading()
None
case None => None
/** Discards the line that is currently being read and restarts reading */
def startReading(): Unit =
this.nextLine = Future(readLine())
end StdinLineReader
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