Aperture Science OS System - Base 01

os.pullEvent = os.pullEventRaw
--Aperture OS
--this program acts as the base program for majority of my new programs, it handles startup, editing, etc
--this program is for minecraft 1.16.5, CC Tweaked
settings.load("SystemSettings")
local w,h = term.getSize()
local Version = "1.0"
function CenterText(y,text)
  local x = math.floor((w - string.len(text)) /2)
  term.setCursorPos(x,y)
  term.clearLine()
  term.write(text)
end

local nOption = 1

local function drawMenu()
term.clear()
term.setCursorPos(1,1)
term.write("APERTURE OS v"..Version)
term.setCursorPos(1,20)
term.write("NEW MENU SCRIPT BEING DEVELOPED TO ALLOW COMBINATION OF BOTH MENU AND APP MENU")
term.setCursorPos(1,2)
shell.run("id")
term.setCursorPos(w-11,1)
if nOption == 1 then
  term.write("Command (WIP DONT USE)")
elseif nOption == 2 then
  term.write("Programs")
elseif nOption == 3 then
  term.write("Shutdown")
elseif nOption == 4 then
  term.write("Find Update")
else
end

end

--gui
term.clear()
local function drawFrontend()
  CenterText( math.floor(h/2) - 3, "")
  CenterText( math.floor(h/2) - 2, "Start Menu")
  CenterText( math.floor(h/2) - 8, "")
  CenterText( math.floor(h/2) + 0, ((nOption == 1) and "[ Command ]") or "Command" )
  CenterText( math.floor(h/2) + 1, ((nOption == 2) and "[ Programs ]") or "Programs" )
  CenterText( math.floor(h/2) + 2, ((nOption == 3) and "[ Shutdown ]") or "Shutdown" )
  CenterText( math.floor(h/2) + 3, ((nOption == 4) and "[ Find Update ]") or "Find Update" )
  CenterText( math.floor(h/2) - 4, "")
end

--display
drawMenu()
drawFrontend()

while true do
  local e,p = os.pullEvent()
  if e == "key" then
    local key = p
    if key == 17 or key == 200 then

      if nOption > 1 then
        nOption = nOption - 1
        drawMenu()
        drawFrontend()
      end
    elseif key == 31 or key == 200 then
    if nOption < 4 then
    nOption = nOption + 1
    drawMenu()
    drawFrontend()
end
elseif key == 28 then

break
end
end
end
term.clear()

--conditions
if nOption == 1 then --console
shell.run("ApertureOS_ClientConsole") --client side Console
elseif nOption == 2 then --programs
shell.run("ApertureOS_ApplicationMenu") --client side App Menu
elseif nOption == 3 then --shutdown
shell.run("ShutdownPrompt")
elseif nOption == 4 then --find updates
shell.run("") --client side update search
end