digger.lua

function digGravel()
  while turtle.detect() do
    turtle.dig()
  end
end

function strafeLeft()

  turtle.turnLeft()
  turtle.forward()
  turtle.turnRight()
end

function strafeRight()
  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
end

function digOnePart()
  turtle.up()
  strafeLeft()
  for x=1,3,1 do
    digGravel()
    strafeRight()
  end
  turtle.down()
  for x=1,3,1 do
    digGravel()
    strafeLeft()
  end
  turtle.down()
  for x=1,3,1 do
    digGravel()
    strafeRight()
  end
  turtle.up()
  strafeLeft()
end

for x=1,10,1 do
  digOnePart()
  turtle.forward()
end