castle grille started

shit/castle_grille/depends.txt

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+mesecons
+mesecons_materials
+mesecons_mvps

shit/castle_grille/init.lua

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+local GRILLE_HEIGHT = 3;
+
+local grilles_to_remove = {}
+
+minetest.register_node("castle_grille:mechanism", {
+	description = "Grille mechanism",
+	tile_images = {"default_steel_block.png"},
+	is_ground_content = true,
+	material = minetest.digprop_stonelike(30.0),
+})
+
+minetest.register_node("castle_grille:grille", {
+	description = "Grille",
+	drawtype = "fencelike",
+	tile_images = {"default_steel_block.png"},
+	is_ground_content = true,
+	material = minetest.digprop_stonelike(1000.0),
+	drop = "",
+})
+
+local function add_down(node,pos)
+	for i = 1, GRILLE_HEIGHT do
+		local current_pos = {x = pos.x, y = pos.y - i, z = pos.z}
+		local current_node = minetest.env:get_node(current_pos)
+		if current_node.name == "air" then
+			minetest.env:remove_node(current_pos)
+			minetest.env:add_node(current_pos, {name = "castle_grille:grille"})
+		else
+			return
+		end
+	end
+end
+
+local function remove_up(node,pos)
+	for i = 1, GRILLE_HEIGHT do
+		local current_pos = {x = pos.x, y = pos.y - i, z = pos.z}
+		local current_node = minetest.env:get_node(current_pos)
+		if current_node.name == "castle_grille:grille" then
+			table.insert(grilles_to_remove,{pos = current_pos, time = GRILLE_HEIGHT - i + 1})
+		else
+			return
+		end
+	end
+end
+
+mesecon:register_on_signal_on(function (pos, node)
+	if node.name == "castle_grille:mechanism" then
+		add_down(node,pos)
+	end
+end)
+
+mesecon:register_on_signal_off(function (node,pos)
+	if node.name == "castle_grille:mechanism" then
+		remove_up(node,pos)
+	end
+end)
+
+local delta = 0
+minetest.register_globalstep(function(dtime)
+	delta = delta + dtime
+	while delta >= 3 do
+		delta = delta - 3
+		for num, grille in ipairs(grilles_to_remove) do
+			if grille.time == 1 then 
+				minetest.env:remove_node(grille.pos)
+			else
+				grille.time = grille.time - 1
+			end
+		end
+	end
+end)