EnderLilyFarm

local len = 16
while true do

    while turtle.getFuelLevel() < (2 * len) + 80 do
        print("refueling...")
        turtle.select(16)
        turtle.suckUp(1)
        turtle.refuel()

    end

    while redstone.getInput("bottom") == false do
        print("waiting for redstone input")
        os.sleep(1)
    end
    local index = len
    while index > 0 do
        local success, data = turtle.inspectDown()
        if success then
            print("Block metadata: ", data.metadata)
            if data.metadata == 7 then
                turtle.digDown()
                turtle.select(1)
                turtle.placeDown()
            end
        end
        turtle.forward()
        index = index - 1
    end
    turtle.turnLeft()
    turtle.turnLeft()
    index = len
    while index > 0 do
        turtle.forward()
        index = index - 1
    end
    turtle.turnLeft()
    turtle.turnLeft()
end