TheOS: Login

--Variables--
local notLogin = true
local w,h = term.getSize()
term.redirect(term.native())
local user = nil
local pass = nil

--Code--
--Startup script--
term.setBackgroundColor(colors.white)
term.clear()
term.setCursorPos(1,1)
term.setTextColor(colors.black)

--GUI
gui.resetButtons()
gui.resetKeys()
gui.cPrint("Login",colors.black,nil,math.floor((w-5)/2),3)
gui.cPrint("Username: >",colors.gray,nil,3,6)
gui.cPrint("Password: >",colors.gray,nil,3,8)
gui.addField(15,6,20,1,"userField")
paintutils.drawFilledBox(15,6,35,6,colors.lightGray)
gui.addField(15,8,20,1,"passField")
paintutils.drawFilledBox(15,8,35,8,colors.lightGray)
gui.addKey(keys.enter,"Enter")
gui.drawButton(15,10,8,3,colors.green,2,2,"Ready!",colors.black,"ready")

--Main Loop--
while notLogin do
    --Script
    local result = gui.detectButtonOrKeyHit()
    if result[1] == "userField" then
        paintutils.drawFilledBox(15,6,35,6,colors.lightGray)
        term.setCursorPos(15,6)
        term.setTextColor(colors.black)
        user = read()
    elseif result[1] == "passField" then
        paintutils.drawFilledBox(15,8,35,8,colors.lightGray)
        term.setCursorPos(15,8)
        term.setTextColor(colors.black)
        pass = read("*")
    elseif result[1] == "Enter" or result[1] == "ready" then
        if user == nil or pass == nil then
        else
            paintutils.drawFilledBox(15,15,35,15,colors.lightGray)
            local realPass
            ok = pcall( function()
            f = fs.open("UserData","r")
            realPass = f.readAll()
            f.close()
            end )
            if realPass == pass then
                notLogin = false
            end
            if ok == false or notLogin then
                gui.cPrint("Wrong username or password!",colors.red,colors.white,13,15)
            end
        end
    end
end