Daanos Computercraft Installer (Not User Friendly)

term.clear()
print("DaanOs Installation")
print("Format Disk?")
local menuOptions = {"Yes", "No"}
local termX, termY = term.getSize()
local selected = 1
function centerText(text, termY)
term.setCursorPos(termX/2-#text/2,termY)
term.write("Format Disk?")
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
end
    local id, key = os.pullEvent()
   if key == 28 then
    return selected
   end
end
end
x = start()
print()
if selected == 1 then
for _,file in ipairs(fs.list("/")) do
  if not fs.isReadOnly(file) then
    fs.delete(file)
  end
end
shell.run("pastebin", "get", "5sZSKwDj", "startup")
os.reboot()
end
if selected == 2 then
os.reboot()
end