View difference between Paste ID: UvHZgFFS and tB5ncjZr

 local termWidth, termHeight = term.getSize()
 local selectedItem = 1
 local onMainMenu = true
 
 function Choice1()
  term.clear()
  term.setCursorPos(1,1)
  print("CHOICE 1")
  sleep(1)
 end
 
 function Choice2()
 term.clear()
 term.setCursorPos(1,1)
 print("CHOICE 2")
 sleep(1)
 end
 
 function Exit()
  onMainMenu = false
  shell.run("clear")
 end
 
 mainMenu = {
 [1] = { text = "Choice 1", handler = Choice1 },
 [2] = { text = "Choice 2", 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()