failstart

local function prc(text, y)
  local w = term.getSize()
  local _, cy = term.getCursorPos()
  term.setCursorPos(math.ceil((w-#text)/2), y or cy)
  write(text)
end



function clear()
  term.clear()
  term.setBackgroundColor(colors.white)
  for i=1,w do
    for j=1,h do
      term.setCursorPos(i,j)
      write(" ")
    end
  end
end

function start ()
    if not fs.exists ("/system/RAM/bluescreen") then
        local data = fs.open ("/system/RAM/bluescreen", "w")
        data.close ()
        shell.run ("/system/desktop")
    end

    term.setBackgroundColor(colors.blue)
    term.setTextColor(colors.white)
    term.clear()
    prc ("Advanced Boot menu", 2)
    prc ("Select the next step", 5)

    term.setCursorPos(5, 10)
    print ("- Start normally")
    term.setCursorPos(5, 12)
    print ("- Commander")
    term.setCursorPos(5, 14)
    print ("- Shutdown")
    term.setBackgroundColor(colors.purple)

    while true do
    local event, button, x, y = os.pullEvent("mouse_click")
    xy = x..","..y

    if x >= 5 and x <= 20 and y == 12 and button == 1 then
    term.setBackgroundColor(colors.black)
    term.setTextColor(colors.white)
    term.clear()
    term.setCursorPos(5, 12)
    print ("- Commander")
    sleep (0.2)
    local data = fs.open ("/system/RAM/ercommander", "w")
        data.close ()
    term.setCursorPos(1,1)
    shell.run ("/system/api/commander")
    elseif x >= 5 and x <= 20 and y == 10 and button == 1 then
    term.setCursorPos(5, 10)
    print ("- Start normally")
    sleep (0.2)
    preskoklog ()
    elseif x >= 5 and x <= 20 and y == 14 and button == 1 then
    term.setCursorPos(5, 14)
    print ("- Shutdown")
    sleep (0.2)
    os.shutdown ()
    end
    end
    end

start ()