lavaFarm.lua

function bucket()
    for i=1,16,1 do
        local item = turtle.getItemDetail(i);
        if(item ~= nill and item.name == "minecraft:bucket") then
            return i;
        end
    end
    return nil;
end

while true do
    pos = bucket();
    if(pos == nil) then break; end
    turtle.select(pos);
    turtle.place();
    os.sleep(10);
end