lonely digging

function waitForEmpty()
    local f = false
    if turtle.getItemCount(16) > 0 then
        f = true
        print("Inventory full, remove items manually")
        os.sleep(10)
    end
    while turtle.getItemCount(16) > 0 do
        os.sleep(10)
    end
    if f then print("Space freed, resuming") end
end
function waitForTorches()
    local f = false
    if turtle.getItemCount(1) < 2 then
        f = true
        print("No torches, put them in the slot number 1")
        os.sleep(10)
    end
    while turtle.getItemCount(1) < 2 do
        os.sleep(10)
    end
    if f then print("Torches found, resuming") end
end
function waitForFuel()
    turtle.select(2)
    local f = false
    if not turtle.refuel(0) then
        f = true
        print("No fuel, put fuel in the slot number 2")
        os.sleep(10)
    end
    if f then print("Fuel found, resuming") end
    while not turtle.refuel(0) do
        os.sleep(10)
    end
    while turtle.getFuelLevel() < 80 do
        turtle.refuel(1)
    end
    turtle.select(1)
end
function waitForChests()
    local f = false
    if turtle.getItemCount(3) == 0 then
        f = true
        print("No chests, put chests in the slot number 3")
        os.sleep(10)
    end
    while turtle.getItemCount(3) == 0 do
        os.sleep(10)
    end
    if f then print("Chests found, resuming") end
end
function forward()
    while not turtle.forward() do
        turtle.dig()
        waitForEmpty()
    end
end
function dig()
    turtle.dig()
    waitForEmpty()
    turtle.digUp()
    waitForEmpty()
    turtle.digDown()
    waitForEmpty()
    forward()
end
n = 0
while true do
    n = math.fmod(n + 1, 2)
    waitForFuel()
    waitForTorches()
    waitForChests()
    dig()
    turtle.turnLeft()
    for i = 1,12 do
        dig()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for i = 1,7 do forward() end
    turtle.placeDown()
    waitForTorches()
    for i = 1,5 do forward() end
    for i = 1,12 do
        dig()
    end
    turtle.turnLeft()
    turtle.turnLeft()
    for i = 1,7 do forward() end
    turtle.placeDown()
    waitForTorches()
    for i = 1,5 do forward() end
    turtle.turnRight()
    if n == 0 then
        turtle.select(3)
        turtle.placeDown()
        for i = 4,16 do
            turtle.select(i)
            turtle.dropDown()
        end
        turtle.select(1)
        waitForChests()
    end
    forward()
    dig()
end