Process.lua

local slots = {}

local total = 0

for i=2,16 do
    local n = turtle.getItemCount(i)
    if n > 0 then
        total = total + n
        table.insert(slots, {i=i, n=n})
    end
end

print("Found "..total.." items.")

for _,s in pairs(slots) do
    turtle.select(s.i)

    for j=1,s.n do
        if turtle.getFuelLevel() < 100 then
            turtle.refuel(1)
        end
        turtle.place()
        turtle.dig()
    end
end

print("Finished processing items!")