MineClone2/mods/ITEMS/mcl_amethyst/grow.lua

function mcl_amethyst.grow_amethyst_bud(pos,ignore_budding_amethyst)
  local node = minetest.get_node(pos)
  if not node.name then return false end
  local def = minetest.registered_nodes[node.name]
  if not def then return false end
  if not def.groups and def.groups.amethyst_buds then return false end
  local next_gen = def._mcl_amethyst_next_grade
  if not next_gen then return false end
  -- Check Budding Amethyst
  if not ignore_budding_amethyst then
    local dir = minetest.wallmounted_to_dir(node.param2)
    local ba_pos = vector.add(pos,dir)
    local ba_node = minetest.get_node(ba_pos)
    if ba_node.name ~= "mcl_amethyst:budding_amethyst_block" then return false end
  end
  local swap_result = table.copy(node)
  swap_result.name = next_gen
  minetest.swap_node(pos,swap_result)
  return true
end

local function get_growing_tool_handle(ignore)
  return function(itemstack, user, pointed_thing)
    if not user:is_player() then return end
    local name = user:get_player_name()
    local pos = minetest.get_pointed_thing_position(pointed_thing)
    if minetest.is_protected(pos, name) then
      minetest.record_protection_violation(pos, name)
      minetest.chat_send_player(name,"Not allowed to use Amethyst Growing Tool in a protected area!")
      return
    end
    if not mcl_amethyst.grow_amethyst_bud(pos, ignore) then
      minetest.chat_send_player(name,"Growing Failed")
    end
  end
end

minetest.register_tool("mcl_amethyst:growing_tool",{
  description = "Amethyst Growing Tool",
  on_use = get_growing_tool_handle(true),
  on_place = get_growing_tool_handle(false),
  inventory_image = "amethyst_cluster.png^amethyst_shard.png",
  groups = {
    tool = 1,
  },
})
mcl_wip.register_experimental_item("mcl_amethyst:growing_tool")