Minecraft Turtle Packager

--Turtle program to Package items which can be 3x3 crafted between a front chest and a bottom chest
--Will be integrated into the Butler.lua program at some point.
--by hornedcommando

--Function to drop all inventory
function emptyInventory()
    for slot = 1, 16 do
        turtle.select(slot)
        turtle.drop()
    end
    --reselect the first slot (just in case)
    turtle.select(1)
end

--Function to package items
function threeByThree()
    --make sure we're on the first inventory slot
    turtle.select(1)
    --get the count, and name of the item
    local slotDetail = turtle.getItemDetail()
    if slotDetail and slotDetail.name then
        if isCraftable(slotDetail.name) then
            local count = turtle.getItemCount(1)
            print("i'm holding " .. count .. " " .. slotDetail.name)
            --verify at least 1 craft can be done
            if count >= 9 then
                --calculate how many crafts can be done
                local maxCrafts = math.floor(count / 9)
                --distribute the named item into Slots 1,2,3,5,6,7,9,10,11.
                turtle.transferTo(2, maxCrafts)
                turtle.transferTo(3, maxCrafts)
                turtle.transferTo(5, maxCrafts)
                turtle.transferTo(6, maxCrafts)
                turtle.transferTo(7, maxCrafts)
                turtle.transferTo(9, maxCrafts)
                turtle.transferTo(10, maxCrafts)
                turtle.transferTo(11, maxCrafts)
                --craft the items
                turtle.craft(maxCrafts)
                --drop crafts and leftovers
                emptyInventory()
            else
                --if not enough of an item to craft, drop it
                print("Not enough " .. slotDetail.name)
                turtle.drop()
                return nil
            end
        else
            --if the item is not craftable, drop it
            print("I can't package this")
            turtle.drop()
            return nil
        end
    end
end


--Function to verify if an item can be packaged
function isCraftable(name)
    local craftable = {
        "minecraft:wheat",
        "minecraft:potato",
        "minecraft:carrot",
        "minecraft:beetroot",
        "minecraft:melon_slice",
        "minecraft:charcoal",
        "minecraft:coal",
        "farmersdelight:tomato",
        "farmersdelight:onion",
        "farmersdelight:rice",
        "farmersdelight:cabbage",
        "thermal:apatite",
        "thermal:sulfur",
        "thermal:niter",
        "thermal:cinnabar",
        "minecraft:bone_meal",
        "minecraft:lapis_lazuli",
        "minecraft:redstone",
        "minecraft:iron_ingot",
        "minecraft:gold_ingot",
        "minecraft:emerald",
        "minecraft:diamond",
        "supplementaries:flax"
    }
    for _, craftable in ipairs(craftable) do
        if name == craftable then
            return true
        end
    end
    return false
end

-- Function to empty the front chest and restart the packaging process
function empty_filter_chest()
    while turtle.suck() do
        turtle.dropDown()
    end
end

-- Loops through functions to continually package between the two chests
while true do
    turtle.select(1)
    while turtle.suckDown() do
        threeByThree()
    end
    empty_filter_chest()
end