menu.lua

local term = require("term")
local fs = require("filesystem")
local comp = require("component")
local computer = require("computer")
local key = require("keyboard")
local event = require("event")
local gpu = comp.gpu

resx, resy = gpu.getResolution()
halfresx = math.floor(resx/2)
halfresy = math.floor(resy/2)
quarterresx = math.floor(halfresx/2)
quarterresy = math.floor(halfresy/2)

src = 0

function printMenu()

  term.clear()
  if src == 0 then
    term.setCursor(quarterresx+2,halfresy-2)
    print("[Continue Normally]")
  else
    term.setCursor(quarterresx+3,halfresy-2)
    print("Continue Normally")
  end
  if src == 1 then
    term.setCursor(quarterresx+2,halfresy) -- Will need to change this
    print("[Display Information]")
  else
    term.setCursor(quarterresx+3,halfresy)
    print("Display Information")
  end
  if src == 2 then
    term.setCursor(quarterresx+2,halfresy+2)
    print("[Shutdown Computer]")
  else
    term.setCursor(quarterresx+3,halfresy+2)
    print("Shutdown Computer")
  end

   _,_,_,kn = event.pull("key_down")

  if kn == 208 then
    if src == 0 then
      src = src +1
    elseif src == 1 then
      src = src +1
    end
  elseif kn == 200 then
    if src == 1 then
      src = src -1
    elseif src == 2 then
      src = src -1
    end
  end
  if kn == 28 then
    if src == 0 then
      term.clear()
      os.exit()
    elseif src == 1 then
      printInfo()
    elseif src == 2 then
      computer.shutdown()
    end
  end
  printMenu()
end

function printInfo()
  id = event.timer(0.5,printMem,math.huge)
  term.clear()
  term.setCursor(quarterresx+2,halfresy-2)
  print("Free Memory: " ..computer.freeMemory()/1024 .. "kb")
  term.setCursor(quarterresx+2,halfresy)
  print("Installed memory: " .. computer.totalMemory()/1024 .. "kb")
  term.setCursor(quarterresx+5,halfresy+2)
  event.pull("key_down")
  event.cancel(id)
end

function printMem()
  term.setCursor(quarterresx+2,halfresy-2)
  print("Free Memory: " .. computer.freeMemory()/1024 .. "kb")
end

printMenu()