SuperExcavate (DON'T STEAL IT!)

args = {...}

--== CONFIG ==--

dumpChestSlot = 1
fuelChestSlot = 2
firstLoadSlot = 3
lastLoadSlot = 16

chunkSize = 8 -- Measured in blocks on each side.
pillarHeight = 10
spaceBetweeenChunks = 2
minimumFuelLevel = 1000

--== END OF CONFIG ==--

dugBlocks = 0
skipped = tonumber(args[1]) or 0

function dug(actually)

  if actually then dugBlocks = dugBlocks + 1 end

  term.setCursorPos(1, 1)
  print("Blocks Dug: " .. dugBlocks)
  print("Fuel Level: " .. turtle.getFuelLevel())

end

function dig()
  did = turtle.detect()
  turtle.dig()
  while turtle.detect() do turtle.dig() sleep(1) end
  dug(did)
end

function digUp()
  did = turtle.detectUp()
  turtle.digUp()
  while turtle.detectUp() do turtle.digUp() sleep(1) end
  dug(did)
end

function digDown()
  did = turtle.detectDown()
  turtle.digDown()
  while turtle.detectDown() do turtle.digDown() sleep(1) end
  dug(did)
end

function fwd()
  dig()
  turtle.forward()
end

function dwn()
  digDown()
  turtle.down()
end

function dumpLoad()

  turtle.select(dumpChestSlot)
  digUp()
  turtle.placeUp()

  for i = firstLoadSlot, lastLoadSlot do

    turtle.select(i)
    turtle.dropUp()

  end

  turtle.select(dumpChestSlot)
  digUp()

  turtle.select(firstLoadSlot)

end

function refuel() -- Doesn't refuel if it doesn't have to.

  fuelLevel = turtle.getFuelLevel()

  if fuelLevel < minimumFuelLevel then

    turtle.select(fuelChestSlot)
    digUp()
    turtle.placeUp()

    turtle.suckUp()
    turtle.refuel()

    digUp()
    turtle.select(firstLoadSlot)

  end

end

function pillar()

  for i = 1, pillarHeight do -- Down...
    dwn()
  end

  for i = 1, pillarHeight do -- ...and back up!
    turtle.up()
  end

  dumpLoad()
  refuel()

end

function chunk()

  for i = 1, chunkSize do

    for j = 1, chunkSize do -- Out...

      fwd()

      if skipped == 0 then
        pillar()
      else
        skipped = skipped - 1
      end

    end

    turtle.turnRight()
    fwd()
    turtle.turnRight()

    for j = 1, chunkSize do -- ...and return!
      fwd()
    end

    if i ~= chunkSize then
      turtle.turnLeft()
      turtle.turnLeft()
    end

  end

end

function chunkAndMove()

  chunk()

  turtle.turnLeft()

  for i = 1, spaceBetweeenChunks do
    fwd()
  end

  turtle.turnLeft()

end

function loop()

  while true do

    chunkAndMove()

  end

end

term.clear()
term.setCursorPos(1, 1)

dug(false)

dumpLoad()
refuel()

turtle.select(firstLoadSlot)
loop() -- It all comes together!

-- End of file.