code block for README-5

README-5

// Collect readers from args/stdin
val readers =
  if (args.isNotEmpty())
    args.map { File(it).reader() }
  else
    listOf(System.`in`.reader())

// Swallow all readers into one string
val content =
  readers.joinToString("\n") {
    // Read all file as a string
    it.readText()
  }