startup

local w,h = term.getSize()

--Some draw functions to get us started

local function printCentered(str, ypos)
  term.setCursorPos(w/2 - #str, ypos)
  term.write(str)
end

local function printRight(str, ypos)
  term.setCursorPos(w - #str, ypos)
  term.write(str)
end

--Add the menus here

function drawMain()
  printCentered("Bees", 8)
  printCentered("Bottler", 10)
  printCentered("Credits", 12)
  printCentered("Shutdown", 14)

  local ypos = 9
  if select == 2 then ypos = 11
  elseif select == 3 then ypos = 13
  elseif select == 4 then ypos = 15 end
  printCentered("---------", ypos)

end

function drawHeader()
  printCentered("Auto Bee Mrk 1", 2)
  printCentered(string.rep("-", w), 3)
  printRight("by: superpowers414", h)
end
--Menu state

local menustate = "main"
select = 1

local mopt = {
  ["main"] = {
    options = {"Bees", "Bottler", "Credits", "quit"},
    draw = drawMain
  }
}

--Run Function
loop = true
  while loop==true do
    term.clear()
    drawHeader()
    mopt[menustate].draw()
    local id, key = os.pullEvent("key")

    if key == 200 and select > 1 then
      select = select-1
    elseif key == 208 and select < #mopt[menustate].options then
      select = select+1
    elseif key == 28 then
      if #mopt[menustate].options[select] == "quit" then
        loop = false
      else
        menustate = #mopt[menustate].options[select]
      end
    end
  end