New emergency dig system

Once again, you can dig any node given enough
time and patience, but now you no longer receive
the resources from that node, and the node goes
into a "displaced" state where you can move past
it but it will re-place itself as soon as you walk
away, similar to how scaling nodes work.

mods/nc_scaling/displace.lua

@@ -0,0 +1,73 @@
+-- LUALOCALS < ---------------------------------------------------------
+local ItemStack, minetest, nodecore, pairs
+    = ItemStack, minetest, nodecore, pairs
+-- LUALOCALS > ---------------------------------------------------------
+
+local modname = minetest.get_current_modname()
+
+local nodename = modname .. ":displaced"
+minetest.register_node(nodename, {
+		description = "Displaced Node",
+		drawtype = "airlike",
+		paramtype = "light",
+		sunlight_propagates = true,
+		walkable = false,
+		pointable = false,
+		climbable = true,
+		groups = {
+			visinv = 1,
+			[modname .. "_fx"] = 1,
+			support_falling = 1
+		},
+		light_source = 1,
+	})
+
+local olddig = minetest.node_dig
+function minetest.node_dig(pos, node, digger, ...)
+	local def = node and node.name and minetest.registered_nodes[node.name]
+	if def then
+		local tool = digger and digger:is_player()
+		and digger:get_wielded_item()
+
+		if (not tool) or nodecore.tool_digs(tool, def.groups) then
+			return olddig(pos, node, digger, ...)
+		end
+
+		local mock = ItemStack(node.name)
+		mock:set_count(def.stack_max or 99)
+
+		local stack = nodecore.stack_get(pos)
+		nodecore.stack_set(pos, "")
+
+		minetest.set_node(pos, {name = nodename})
+		nodecore.stack_set(pos, mock)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("dstack", stack:to_string())
+		meta:set_string("dnode", minetest.serialize(node))
+
+		return nodecore.scaling_particles(pos, {
+				time = 0.1,
+				amount = 40,
+				minexptime = 0.02
+			})
+	end
+end
+
+nodecore.register_limited_abm({
+		label = "node displacement decay",
+		interval = 1,
+		chance = 1,
+		limited_max = 100,
+		nodenames = {nodename},
+		ignore_stasis = true,
+		action = function(pos)
+			for _, p in pairs(minetest.get_connected_players()) do
+				if nodecore.scaling_closenough(pos, p) then return end
+			end
+			local meta = minetest.get_meta(pos)
+			local stack = meta:get_string("dstack")
+			local node = meta:get_string("dnode")
+			minetest.set_node(pos, minetest.deserialize(node))
+			nodecore.stack_set(pos, stack)
+		end
+	})

mods/nc_scaling/init.lua

@@ -9,4 +9,5 @@ include("api")
 include("node")
 include("abm")
 include("placement")
+include("displace")
 include("hints")