alan

global direction =

function forwd (times)
  for i=1, times do
    if turtle.forward() then
      --just go
    else
      turtle.dig()
      turtle.forward()
    end
  end
end

function turnAround()
  turtle.turnLeft()
  turtle.turnLeft()
end

function circle ()
  turtle.digDown()
  turtle.down()
  forwd(4)
  turtle.turnLeft()
  direction = 'E'
  forwd(1)
  turtle.turnLeft(1)
  direction = 'N'
  forwd(4)
  turtle.turnLeft()
  direction = 'W'
  forwd(1)
  turtle.turnLeft()
  direction = 'S'
end

function ascend ()
  local surfaced = false
  local hitBottom = false
  local moving = true

  turtle.up()
  if direction == 'S' then
    turnAround()
    while moving == true do
      moving = turtle.forward()
  else if direction == 'E' then
  else if direction == 'N' then
  else if direction == '
  while surfaced ~= true do
    local isBlock, type =  turtle.inspect()
    print (type.name)
    if type.name == 'minecraft:chest' or isBlock == false then
      surfaced = true
      print (type.name, isBlock, "breaking?")
      break
    else
      turtle.up()
    end
  end
  for i=1, 16 do
    turtle.drop()
  end
  turtle.select(1)

  turnAround()
  while hitBottom == false do
    hitBottom = turtle.down()
  end
end

function checkInv ()
  if turtle.getItemCount(16) > 0 then
    ascend()
  end
end

--Main Program


for i=1, 75 do
  checkInv()
  circle()
end