Enchanting Turtle V0.2

--Enchanting Turtle V0.2 by QQII
--Declerations
local enchantLevel = 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

--Functions
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 function toLevel(experience)
    if experience <= 272 then
        return experience / 17
    elseif experience > 272 and experience <= 825 then
        return 9.84 + 0.17 * math.sqrt(24 * experience - 5159)
    else
        return 21.6 + 0.075 * math.sqrt(56 * experience - 32511)
    end
end

local function clearSlot(slotNumber)    --Attemps to clear the slot slotNumber
    if turtle.getItemCount(slotNumber) ~= 0 then
        turtle.select(slotNumber)
        if not turtle.drop() then
            print("ERROR: failure to clear slot number " .. slotNumber)
        end
    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()                --Attempts to take something from the chest above the turtle
    clearSlots()
    turtle.select(slot)
    if not turtle.suck() then
        print("ERROR: failure to obtain item to enchant")
    end
    if turtle.getItemCount(slot) ~= 1 then
        if not turtle.drop(turtle.getItemCount(slot) - 1) then
            print("ERROR: failure to reduce slot number " .. slot .. " to one item")
        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

--Wrap peripherals
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

--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 not turtle.attackUp() do
        xp.collect()
    end
    if xp.getLevels() >= enchantLevel then
        getItem()
        enchant()
    end
end