Enchanting Turtle V0.3

--Enchanting Turtle V0.3 by QQII
--Declerations
local Arguments = { ... }       --Program arguments
local enchantLevel = tonumber(Arguments[1]) or 0    --The level the turtle initially attemps to perform an enchant at
local enchants = 0                  --The number of enchants performed by the turtle
local slot = 1                      --The slot number that the items to be enchanted are in
local level = 0                     --Requested by Perry

--Wrap peripherals
function wrapPeripheral(thing)
    local Sides = {
                    "left","right",
                    "top","bottom",
                    "front","back",
                    }

    for i,v in pairs(Sides) do
        if (peripheral.isPresent(v) and peripheral.getType(v) == thing) then
            print("'"..thing.."' found on side '"..v.."'.")
            return peripheral.wrap(v), v
        end
    end

    print("ERROR: '"..thing.."' not found!")
    return nil, nil
end

local xp = wrapPeripheral("xp")
    if (not xp) then
        print("ERROR: xp peripheral is necessary")
        os.shutdown()
    end
xp.setAutoCollect(true)             --Sets the turtle to automatically collect xp

--Functions
local function clearSlot(slotNumber)    --Attemps to clear the slot slotNumber
    if turtle.getItemCount(slotNumber) ~= 0 then
        turtle.select(slotNumber)
        if turtle.dropDown() then
            return true
        else
            print("ERROR: failure to clear slot number " .. slotNumber)
            return false
        end
    else
        return true
    end
end

local function clearSlots()             --Places all the items into the chest under the turtle
    for i = 1,16 do
        if turtle.getItemCount(i) ~= 0 then
            clearSlot(i)
        end
    end
end

local function getItem()
    if clearSlot(slot) then
        turtle.select(slot)
        if turtle.suck() then
            if turtle.getItemCount(slot) ~= 1 and turtle.getItemCount(slot) ~= 0 then
                if turtle.drop(turtle.getItemCount(slot) - 1) then
                    return true
                else
                    print("ERROR: failure to reduce slot number " .. slot .. " to one item")
                    return false
                end
            end
        else
            print("ERROR: failure to obtain item to enchant")
            return false
        end
    end
end

local function enchant()                --Attemps to enchant the item
    turtle.select(slot)
    if xp.enchant(enchantLevel) then
        enchants = enchants + 1
        print("Enchants Performed: " .. enchants)
    end
    clearSlots()
end

--User Inputs
print("The turtle will attack mobs above it.")
print("It will look for items to enchant in the inventory infront of it.")
print("It will place enchanted items in an inventory below it.")
io.write("Level to Enchant: ")
    if enchantLevel <= 0 then
        while enchantLevel <= 0 do
            enchantLevel = tonumber(read())
        end
    else
        print(enchantLevel)
    end

--Main Script
while true do
    while xp.getLevels() < enchantLevel do
        turtle.attack()
        if level ~= xp.getLevels() then
            print("Level: " .. xp.getLevels())
        end
        level = xp.getLevels()
        os.sleep(0.1)
    end
    if xp.getLevels() >= enchantLevel then
        print("Enchanting...")
        getItem()
        enchant()
    end
end