VoxeLibre/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")