Organize mods into modpacks for better overview

mods/ITEMS/gemalde/init.lua

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+-- Count the number of pictures.
+local function get_picture(number)
+	local filename	= minetest.get_modpath("gemalde").."/textures/gemalde_"..number..".png"
+	local file		= io.open(filename, "r")
+	if file ~= nil then io.close(file) return true else return false end
+end
+
+local N = 1
+
+while get_picture(N) == true do
+	N = N + 1
+end
+
+N = N - 1
+
+-- register for each picture
+for n=1, N do
+
+local groups = {choppy=2, dig_immediate=3, picture=1, not_in_creative_inventory=1}
+if n == 1 then
+	groups = {choppy=2, dig_immediate=3, picture=1, deco_block=1}
+end
+
+local desc
+if n == 1 then
+	desc = "Painting"
+else
+	desc = "Painting ("..n..")"
+end
+
+-- inivisible node
+minetest.register_node("gemalde:node_"..n.."", {
+	description = desc,
+	drawtype = "signlike",
+	tiles = {"gemalde_"..n..".png","gemalde_bg.png"},
+	visual_scale = 3.0,
+	inventory_image = "gemalde_node.png",
+	is_ground_content = false,
+	wield_image = "gemalde_node.png",
+	paramtype = "light",
+	paramtype2 = "wallmounted",
+	sunlight_propagates = true,
+	walkable = false,
+	selection_box = {
+		type = "wallmounted",
+		wall_side = { -0.5, -1.5, -1.5, -0.4, 1.5, 1.5 },
+	},
+	drop = "gemalde:node_1",
+	groups = groups,
+
+	on_rightclick = function(pos, node, clicker)
+	
+		local length = string.len (node.name)
+		local number = string.sub (node.name, 14, length)
+		
+		-- TODO. Reducing currently not working, because sneaking prevents right click.
+		local keys=clicker:get_player_control()
+		if keys["sneak"]==false then
+			if number == tostring(N) then
+				number = 1
+			else
+				number = number + 1
+			end
+		else
+			if number == 1 then
+				number = N - 1
+			else
+				number = number - 1
+			end
+		end
+
+		print("[gemalde] number is "..number.."")
+		node.name = "gemalde:node_"..number..""
+		minetest.set_node(pos, node)
+	end,
+
+--	TODO.
+--	on_place = minetest.rotate_node
+})
+
+end
+
+-- initial craft
+minetest.register_craft({
+	output = 'gemalde:node_1',
+	recipe = {
+		{'mcl_core:stick', 'mcl_core:stick', 'mcl_core:stick'},
+		{'mcl_core:stick', 'group:wool', 'mcl_core:stick'},
+		{'mcl_core:stick', 'mcl_core:stick', 'mcl_core:stick'},
+	}
+})
+