ComputerCraft Tutorial: obsidian_generator_0_1

-- #################################
-- Obsidian Generator with a Mining Turtle
-- version 0.1a
-- http://hevohevo.hatenablog.com/

-- Use command, if you want to build a facility.
--  > obsidian_generator build
-- Already exists.
--  > obsidian_generator
-- The facility size is 3, 4, 5 (X,Y,Z)

BLOCK = 13
CHEST = 14
WATER = 15
FUEL = 16
MIN_FUEL_LEVEL = 40

REDSTONE = 1
LAVE = 2
OBSIDIAN = 3

function placeLave()
  turtle.select(LAVE)
  turtle.place()
  os.sleep(3)
  turtle.place()
end

function digObsidian()
  turtle.select(OBSIDIAN)
  turtle.digDown()
  turtle.dropUp()
end

function placeRedstone()
  turtle.select(REDSTONE)
  turtle.placeDown()
end

function waitForEnoughItems(itemName, n, slot)
  turtle.select(slot)
  while turtle.getItemCount(slot) < n do
    if itemName then print(string.format("Insert %s into slot %d",itemName,slot)) end
    os.sleep(1)
    os.pullEvent("turtle_inventory")
  end
end

function waitForEnoughFuel(minLevel, slot)
  local qty = 0
  local refuel = function()
    turtle.select(slot)
    turtle.refuel()
    qty = turtle.getFuelLevel()
    print("fuel: ",qty)
    return qty
  end

  while refuel() < minLevel do
    print(string.format("Insert fuel-items into slot %d: %d/%d", slot, qty, minLevel))
    os.sleep(1)
    os.pullEvent("turtle_inventory")
  end
end

-- functions to build
function loop(n,func)
  for i=1,n do func() end
end

function placeDownForward()
  turtle.placeDown()
  turtle.forward()
end

function build()
  turtle.select(BLOCK)

  for y=1,3 do
  turtle.up()
    for i=1,2 do
      turtle.forward()
      loop(3, placeDownForward)
      turtle.turnRight()
      turtle.forward()
      placeDownForward()
      turtle.turnRight()
    end
  end

  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
  loop(2, turtle.forward)
  loop(3, turtle.down)
  turtle.place()
  turtle.up()
  turtle.placeDown()
  turtle.up()
end

function build2()
  loop(2,turtle.turnRight)
  turtle.select(WATER)
  turtle.place()
  loop(2,turtle.turnRight)
  turtle.select(CHEST)
  turtle.placeUp()
end

function build3()
  turtle.select(OBSIDIAN)
  turtle.turnRight()
  turtle.dig()
  loop(2, turtle.turnRight)
  turtle.dig()
  turtle.turnRight()
  turtle.dropUp()
end

-- main
local args = {...}
if args and #args > 0 then
  waitForEnoughFuel(MIN_FUEL_LEVEL, FUEL)
  waitForEnoughItems("26 Blocks", 26, BLOCK)
  waitForEnoughItems("a Chest", 1, CHEST)
  waitForEnoughItems("a Water-Bucket", 1, WATER)
end

waitForEnoughItems("some Redstone(s)", 1, REDSTONE)
waitForEnoughItems("a Lave-Bucket", 1, LAVE)

if args and #args > 0 then
  print("Building Start!")
  build()
  build2()
  build3()
  print("Building Finished!")
end

local numRs = turtle.getItemCount(REDSTONE)
print("I try to craft ",numRs," obsidian(s).")

for i=1, numRs do
  placeRedstone()
  placeLave()
  digObsidian()
end