gistfile1.txt

import sys.process._

object search {

  def main: Option[String] = {
    retry2(iphone)
  }

  def iphone: Option[String] = {
    val ping = try {
      Process("ping -c 5 192.168.0.20") #&& ("echo okkk") !!
    } catch {
      case e: Throwable => "error"
    }
    if (ping == "okkk") Some("家にいます") else None
  }

  def retry2[R](f: => R, n: Int = 40): R = {
    if (n > 0) {
      f match {
        case Some(s) => f
        case None => retry2(f, n - 1)
      }
    } else f
  }
}