Mcard editor

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-- use this simple program to manualy change creds
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function writeCard()
    if not fs.exists("disk/creds.lua") then
        os.reboot()
    end
    local Card = fs.open("disk/creds.lua", "w")
    Card.write(textutils.serialise(tostring(creds)))
    Card.close()
    disk.setLabel("right", tostring(creds).."$")
end
function readCard()
    if not fs.exists("disk/") then
        os.reboot()
    end
    if not fs.exists("disk/creds.lua") then
        term.setCursorPos(10, 7)
        print("This isn't a Mcard")
        term.setCursorPos(8, 8)
        print("Do you wan't to make it a Mcard?")
        term.setCursorPos(12, 10)
        write(" Yes     >No<")
        confi = false
        while confi == false do
            term.setCursorPos(12, 10)
            local event, key, isHeld = os.pullEvent("key")
            if key == keys.left then
                write(">Yes<     No ")
                confirm = true
            elseif key == keys.right then
                write(" Yes     >No<")
                confirm = false
            elseif key == keys.enter then
                confi = true
            end
        end
        term.clear()
        if confirm == true then
            local Card = fs.open("disk/creds.lua", "w")
            Card.write(textutils.serialise("0"))
            Card.close()
            disk.setLabel("right", "0$")
        else
            term.setCursorPos(8, 8)
            while fs.exists("disk/") do
                term.setCursorPos(8, 8)
                write("please remove your disk")
                sleep(0,5)
            end
        end
    end
    local Card = fs.open("disk/creds.lua", "r")
    creds = Card.readAll()
    Card.close()
    creds = tonumber(textutils.unserialize(tostring(creds)))
end
function insert_card()
    paintutils.drawFilledBox(1, 1, 39, 13, colors.green)
    while not fs.exists("disk/") do
        term.clear()
        paintutils.drawFilledBox(1, 1, 39, 13, colors.green)
        term.setCursorPos(10, 6)
        term.write("{please insert card}")
        sleep(1)
    end
    term.clear()
end



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insert_card()
readCard()
term.clear()
term.setCursorPos(8, 8)
write("change creds to")
term.setCursorPos(8, 10)
creds = read()
writeCard()
os.reboot()