startup

rednet.open("top")
djComputer = 714
nSelect = 1

function cPrint(text)
  local w, h = term.getSize()
  local x, y = term.getCursorPos()
  term.setCursorPos(math.ceil((w/2)-(text:len()/2)), y)
  print(text)
end

function clear()
  term.clear()
  term.setCursorPos(1,1)
end

function mainLayout()
  clear()
  term.setTextColour(colours.white)
  cPrint("What would you like to do?")
  term.setCursorPos(1,3)
  if nSelect == 1 then
    term.setTextColour(colours.green)
    cPrint("[ Play new song ]")
  else
    term.setTextColour(colours.white)
    cPrint("  Play new song  ")
  end
end

function mainScreen()
  while true do
    mainLayout()
    event, p1, p2, p3 = os.pullEvent()
    if event == "key" then
      key = p1
      if key == 200 and nSelect > 1 then
        nSelect = nSelect-1
      elseif key == 208 and nSelect < 1 then
        nSelect = nSelect+1
      elseif key == 200 and nSelect == 1 then
        nSelect = 1
      elseif key == 208 and nSelect == 1 then
        nSelect = 1
      elseif key == 28 and nSelect == 1 then
        rednet.send(djComputer, "StartNewSong")
      end
    end
  end
end

mainScreen()