Mineclonia/mods/ITEMS/REDSTONE/mcl_observers/init.lua

local rules_flat = {
	{ x = 0, y = 0, z = -1 },
}
local get_rules_flat = function(node)
	local rules = rules_flat
	for i=1, node.param2 do
		rules = mesecon.rotate_rules_left(rules)
	end
	return rules
end

minetest.register_node("mcl_observers:observer", {
	description = "Observer",
	is_ground_content = false,
	sounds = mcl_sounds.node_sound_stone_defaults(),
	paramtype2 = "facedir",
	-- TODO: Add to craft guide and creative inventory when it's useful
	groups = {pickaxey=1, not_in_craft_guide=1, not_in_creative_inventory=1 },
	tiles = {
		"mcl_observers_observer_top.png", "default_furnace_bottom.png",
		"mcl_observers_observer_side.png", "mcl_observers_observer_side.png",
		"mcl_observers_observer_front.png", "mcl_observers_observer_back.png",
	},
	after_dig_node = function(pos, oldnode, oldmetadata, digger)
		local meta = minetest.get_meta(pos)
		local meta2 = meta
		meta:from_table(oldmetadata)
		local inv = meta:get_inventory()
		for i=1, inv:get_size("main") do
			local stack = inv:get_stack("main", i)
			if not stack:is_empty() then
				local p = {x=pos.x+math.random(0, 10)/10-0.5, y=pos.y, z=pos.z+math.random(0, 10)/10-0.5}
				minetest.add_item(p, stack)
			end
		end
		meta:from_table(meta2:to_table())
	end,
	_mcl_blast_resistance = 17.5,
	_mcl_hardness = 3.5,
	-- TODO: Mesecons handling
	mesecons = {effector = {
		rules = get_rules_flat,
	}},
	on_rotate = false,
})

minetest.register_craft({
	output = "mcl_observers:observer",
	recipe = {
		{ "mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble" },
		{ "mcl_nether:quartz", "mesecons:redstone", "mesecons:redstone" },
		{ "mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble" },
	}
})
minetest.register_craft({
	output = "mcl_observers:observer",
	recipe = {
		{ "mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble" },
		{ "mesecons:redstone", "mesecons:redstone", "mcl_nether:quartz" },
		{ "mcl_core:cobble", "mcl_core:cobble", "mcl_core:cobble" },
	}
})