Turtle DarkIron

function goForward(nTimes, bBreak, bRetry)
  local nTimes = nTimes or 1
  local bBreak = bBreak or false
  local bRetry = bRetry or true
  for i = 1,nTimes do
    if (bRetry) then
      while not turtle.forward() do
        if (bBreak) then
          turtle.dig()
          print("Digging")
        end
        print("Retrying forward movement")
      end
    else
      if (not turtle.forward() and bBreak) then
        turtle.dig()
        turtle.forward()
      end
    end
  end
end

function turnRight(nTimes)
  local nTimes = nTimes or 1
  for i = 1,nTimes do
    turtle.turnRight()
  end
end

function turnLeft(nTimes)
  local nTimes = nTimes or 1
  for i = 1,nTimes do
    turtle.turnLeft()
  end
end

turtle.select(1)
turtle.suckDown()

turnRight(2)
goForward(2)
turnLeft()
goForward(3)
turnLeft()

for i=1,turtle.getItemCount(1) do
  turtle.select(1)
  turtle.place()
  sleep(2)

  turtle.select(2)
  turtle.dig()
  sleep(2)
end

turnLeft()
goForward(3)
turnRight()
goForward(2)

turtle.select(2)
turtle.dropDown()