Disk program ComputerCraft

local termWidth, termHeight = term.getSize()
local selectedItem = 1
local onMainMenu = true

function Choice1()
 term.clear()
 term.setCursorPos(1,1)
 print("Check ID")
 sleep(2)
 term.clear()
 term.setCursorPos(1,1)
 i = disk.getID("left")
 print(i)
 print"Press Any Key To Continue"
 os.pullEvent("key")
end

function Choice2()
term.clear()
term.setCursorPos(1,1)
if disk.isPresent("left") == true then
print"Do you want to label this Disk"
a = read()
if a == "yes" then
term.clear()
term.setCursorPos(1,1)
print"What should the label be?"
label = read()
term.clear()
term.setCursorPos(1,1)
print(label)
print"This will be the label is that good?"
c = read()
if c == "yes" then
disk.setLabel("left", ""..label.."")
sleep(1)
end
end
end
end

function Exit()
 term.clear()
 term.setCursorPos(1,1)
 onMainMenu = false
end

mainMenu = {
[1] = { text = "Check ID", handler = Choice1 },
[2] = { text = "Set Disk Label", handler = Choice2 },
[3] = { text = "Exit", handler = Exit }
}

function printMenu( menu )
 for i=1,#menu do
  if i == selectedItem then
   print(">> "..menu[i].text)
  else
   print("   "..menu[i].text)
  end
 end
end

function onKeyPressed( key, menu )
 if key == keys.enter then
  onItemSelected(menu)
 elseif key == keys.up then
  if selectedItem > 1 then
   selectedItem = selectedItem - 1
  end
 elseif key == keys.down then
  if selectedItem < #menu then
   selectedItem = selectedItem + 1
  end
 end
end

function onItemSelected( menu )
 menu[selectedItem].handler()
end

function main()
 while onMainMenu do
  term.clear()
  term.setCursorPos(1,1)
  printMenu(mainMenu)
  event, key = os.pullEvent("key")
  onKeyPressed(key,mainMenu)
 end
end

main()