farMelo.lua

local sleepTime = 10
local fuelSlot = 16

print("Place fuel in slot " ..fuelSlot)

function digForward()
    while turtle.forward() == false do
        if turtle.dig() == false then
            turtle.attack()
        end
    end
end

function emptyInv()
    local suc, chest = turtle.inspect()
    if chest.name == "minecraft:chest" or chest.name == "minecraft:trapped_chest" then
        print("chest found")
        for i=1,15 do
            turtle.select(i)
            turtle.drop(turtle.getItemCount(i))
        end
    end
end

function refuelMe()
    print(turtle.getFuelLevel())
    turtle.select(fuelSlot)
    while turtle.getFuelLevel() < 1000 do
        if turtle.getItemCount(fuelSlot) <= 0 then
            print("low fuel")
        end
        turtle.refuel(1)
    end
end

while true do
    digForward()

    local success, border = turtle.inspectDown()
    if border.name == "minecraft:wool" then
        emptyInv()
        refuelMe()
        turtle.turnRight()
        turtle.turnRight()
        print("Going to sleep for " ..sleepTime.. " seconds")
        sleep(sleepTime)
    end
end