turtle_test

slot = 1
stock = 0

local findSlot = function()
    for slot=1, 16 do
        stock = turtle.getItemCount( slot )
        if stock > 0 then
            turtle.select( slot )
            return true
        end
    end
    print("Empty")
    return false
end

local tryBack = function()
    if turtle.back() then
        return true
    else
        turtle.turnLeft()
        turtle.turnLeft()
        limit = 128
        while not turtle.forward() do
            turtle.dig()
            limit = limit - 1
            if limit == 0 then
                return false
            end
        end
        turtle.turnLeft()
        turtle.turnLeft()
        return true
    end
end

local abort = function()
    print("Abort")
    return
end

for x=1,16 do
    for y=1,16 do
        if not tryBack() then
            abort()
            return
        end
        if stock > 0 then
            turtle.place()
            stock = stock - 1
        elseif not findSlot() then
            abort()
            return
        else
            turtle.place()
            stock = stock - 1
        end
    end
    if x % 2 == 0 then
        turtle.turnRight()
    else
        turtle.turnLeft()
    end
    if not tryBack() then
        abort()
        return
    end
    if x % 2 == 0 then
        turtle.turnRight()
    else
        turtle.turnLeft()
    end
    turtle.back()
end
print("Done")