Cap

-- cap - caps a square hole
-- Designed for covering the holes from a quarry

-- Place on the bottom level you want to cap in a corner.

local drop_slots       = { 1, 15 }
local fuel_slot        = 16
local refuel_level     = 0

function getEmptySlots()
  numslots = 0
  for i = drop_slots[1], drop_slots[2] do
    if turtle.getItemCount(i) == 0 then
      numslots = numslots + 1
    end
  end
  return numslots
end
function isDropSlotsEmpty()
  return getEmptySlots() == drop_slots[2] - drop_slots[1]
end

function refuel()
  while turtle.getFuelLevel() == 0 do
    if turtle.getItemCount(fuel_slot) ~= 0 then
      turtle.select(fuel_slot)
      turtle.refuel(1)
    else
      sleep(1)
    end
  end
  turtle.select(drop_slots[1])
end

function cap(levels)
  for i = 1,levels do
    local count

    turtle.turnLeft()
    count = turtle.detect() and 0 or 1
    turtle.turnRight()
    refuel()
    turtle.up()

    while true do
      if (turtle.detect() or turtle.detectDown()) then break end

      while not turtle.detect() and not turtle.detectDown() do
        while isDropSlotsEmpty() do sleep(1000) end
        turtle.placeDown()
        turtle.attack()
        refuel()
        turtle.forward()
      end

      if (turtle.detectDown()) then
        refuel()
        turtle.back()
      else
        while isDropSlotsEmpty() do sleep(1000) end
        turtle.placeDown()
      end

      if (count%2 == 0) then turtle.turnRight() else turtle.turnLeft() end
      if (turtle.detect()) then break end
      turtle.attack()
      refuel()
      turtle.forward()
      if (count%2 == 0) then turtle.turnRight() else turtle.turnLeft() end
      count = count + 1
    end
  end
end

local tArgs = { ... }
if #tArgs == 1 then
  cap(tonumber(tArgs[1]))
else
  print("usage: cap levels")
  return
end