func _terminalSize()

in Sources/ArgumentParser/Usage/HelpGenerator.swift [336:362]

• 25 lines of code
• 3 McCabe index (conditional complexity)

func _terminalSize() -> (width: Int, height: Int) {
#if os(WASI)
  // WASI doesn't yet support terminal size
  return (80, 25)
#elseif os(Windows)
  var csbi: CONSOLE_SCREEN_BUFFER_INFO = CONSOLE_SCREEN_BUFFER_INFO()
  guard GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi) else {
    return (80, 25)
  }
  return (width: Int(csbi.srWindow.Right - csbi.srWindow.Left) + 1,
          height: Int(csbi.srWindow.Bottom - csbi.srWindow.Top) + 1)
#else
  var w = winsize()
#if os(OpenBSD)
  // TIOCGWINSZ is a complex macro, so we need the flattened value.
  let tiocgwinsz = Int32(0x40087468)
  let err = ioctl(STDOUT_FILENO, tiocgwinsz, &w)
#else
  let err = ioctl(STDOUT_FILENO, TIOCGWINSZ, &w)
#endif
  let width = Int(w.ws_col)
  let height = Int(w.ws_row)
  guard err == 0 else { return (80, 25) }
  return (width: width > 0 ? width : 80,
          height: height > 0 ? height : 25)
#endif
}