os,pullevent

shell.run("clear")
print(" Boot Screen")
print("\nOs1")
print("os2")
write("\nWhat Would U like To Run") -- "\n" skips a line
local input = read()
if input == "Os1" then
shell.run("clear")
print("Running Os 1") - the os code will be here
elseif input == "Os2" then
shell.run("clear")
print("ComputerCraft")
else
Error("Unknown OS")
end

local running = true
local selectedItem = 1
local x, y = term.getSize()
local yourOsName = "" -- edit this to the name of your OS... (if the file is named OS1 then type "OS1") --

-- This is copied from another post --

function clear(posX, posY)
term.clear()
if posX == nil then
if posY == nil then
term.setCursorPos(1,1)
else
term.setCursorPos(posX, posY)
end
end
end

clear()
print("Please choose an OS!")

function Menu()
--[[Actions]]--
function Os1()
clear()
running = false
print("Running "..yourOsName)
shell.run(yourOsName)
end

function Os2()
clear()
running = false
print("CraftOS v1.45")
end
--[[Menu]]--
mainMenu = {
[1] = { text = "Os1", handler = Os1 },
[2] = { text = "Os2", handler = Os2 }
}


--[[print]]--

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

--[[handler]]--

function onKeyPressed( key, menu )
  if key == 28 then
	onItemSelected( menu )
  elseif key == 200 then
	if selectedItem > 1 then
selectedItem = selectedItem - 1
end
  elseif key == 208 then
	if selectedItem < #menu then
selectedItem = selectedItem + 1
end
  end
end  

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

--[[Main Method]]--
selectedItem = 1
while running do
for i = 2,18 do
term.setCursorPos(1,i)
term.clearLine()
end
term.setCursorPos(1,2)
printMenu(mainMenu)
event, key = os.pullEvent("key")
onKeyPressed( key, mainMenu )
end
end

Menu()