ObsidianGenerator.lua

print("Running obsidian generator")

local function find(name, damage)
  for i = 1, 16 do
    local item = turtle.getItemDetail(i)
    if item then
      if item.name == name and (item.damage == damage or item.metadata == damage) then
        return i
      end
    end
  end
  return false
end

local function face(name, meta, using, altname)
  using = using or turtle.turnRight
  for i = 1, 4 do
    local ok, block = turtle.inspect()
    if ok then
      if (block.name == name or block.name == altname) and block.metadata == meta then
        return true
      else
        print(block and block.name, block.metadata)
      end
    end
    using()
  end
  return false
end


local tries = 0
while true do
  -- determine stage we are on
  local findBucket = find("minecraft:bucket", 0)
  local findLava = find("minecraft:lava_bucket", 0)

  if findBucket then
    print("Got a bucket.")
    tries = 0
    -- get lava
    turtle.select(findBucket)
    turtle.dropUp()
    turtle.select(1)
  elseif findLava then
    print("Got a lava bucket.")
    tries = 0
    -- place lava, dig, turn right, drop
    if face("minecraft:water", 1, nil, "minecraft:flowing_water") then
      turtle.select(findLava)
      turtle.place()
      turtle.dig()
    else
      error("Could not find water!")
    end
  else
    -- either waiting for lava bucket, or something went wrong.
    term.clear()
    term.setCursorPos(1, 1)
    tries = tries + 1
    print(string.format("Waiting for lava bucket... %d", tries))
    if tries >= 100 then
      printError("We've probably run out of lava.")
      os.sleep(5)
      os.shutdown()
    end
  end
  os.sleep(0.1)
end