pillarDig

function moveForward()
  if turtle.getFuelLevel() <=0 then
        turtle.select(16)
        turtle.refuel()
  end
  turtle.forward()
end
function digForward(x)
  for i=1,x do
        turtle.dig()
        moveForward()
  end
end
function digArea(x)
  if x<=1 then
        turtle.dig()
  else
        digForward(x)
        turtle.turnRight()
        digForward(x-1)
        turtle.turnRight()
        digForward(x-1)
        turtle.turnRight()
        digForward(x-2)
        turtle.turnRight()

        digArea(x-2)

        turtle.turnLeft()
        moveForward()
        turtle.turnLeft()
        moveForward()
        turtle.turnRight()
        turtle.turnRight()
  end
end
--get area to dig--
term.clear()
term.setCursorPos(1,7)
write("Enter diamater to dig - ")
local d = tonumber(io.read())
term.clear()
term.setCursorPos(1,7)
write("Enter Height to dig - ")
local h = tonumber(io.read())
for j=1,h do
  digArea(d)
  if turtle.getFuelLevel() <=0 then
        turtle.select(16)
        turtle.refuel()
  end
  turtle.up()
end
for j=1,h do
  if turtle.getFuelLevel() <=0 then
        turtle.select(16)
        turtle.refuel()
  end
  turtle.down()
end