MenuOption

function one()
print("Hello")
end
function two()
print("Hey")
end
function three()
print("Hi")
end
local menuOptions = {"1", "2", "3"}
local termX, termY = term.getSize()
local selected = 1
function centerText(text, termY)
term.setCursorPos(termX/2-#text/2,termY)
term.write(text)
return true
end
function start()
while true do
 term.clear()
 for i,v in ipairs(menuOptions) do
  if i == selected then
       centerText("[ "..v.."] ", i)
	else
	   centerText(v,i)
	end
   end
   local id, key = os.pullEvent()
   if key == 208 and selected < #menuOptions then
    selected = selected + 1
   elseif key == 200 and selected > 1 then
    selected = selected - 1
   elseif key == 28 then
    return selected
   end
end
end
x = start()
print()
if selected == 1 then
 one()
end
if selected == 2 then
 two()
end
if selected == 3 then
 three()
end