added filter

mods/filter/LICENSE.txt

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+License for Code
+----------------
+
+Copyright (C) 2016 cd2 (cdqwertz) <cdqwertz@gmail.com>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+http://www.gnu.org/licenses/lgpl-2.1.html
+
+License for Media
+-----------------
+
+CC-BY-SA 3.0 UNPORTED. Created by cd2 (cdqwertz)

mods/filter/depends.txt

@@ -0,0 +1 @@
+default

mods/filter/init.lua

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+filter = {}
+filter.materials = {}
+
+local filter_form = "size[8,6]"
+local filter_form = filter_form..default.gui_colors
+local filter_form = filter_form..default.gui_bg
+local filter_form = filter_form.."list[current_name;main;3.5,0.3;1,1;]" 
+local filter_form = filter_form..default.itemslot_bg(3.5,0.3,1,1)
+local filter_form = filter_form.."list[current_player;main;0,1.85;8,1;]" 
+local filter_form = filter_form..default.itemslot_bg(0,1.85,8,1)
+local filter_form = filter_form.."list[current_player;main;0,3.08;8,3;8]" 
+local filter_form = filter_form..default.itemslot_bg(0,3.08,8,3)
+
+function filter.register_material(name, drops)
+	filter.materials[name] = drops
+end
+
+filter.register_material("default:sand", {"default:stone_item", "default:diamond"})
+
+minetest.register_node("filter:filter", {
+	description = "Filter",
+	tiles = {"filter_filter_top.png", "filter_filter.png"},
+	groups = {crumbly=3},
+	on_punch = function(pos, node, player, pointed_thing)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		local item = inv:get_stack("main", 1)
+		print("[filter] item : " .. item:to_string())
+		if item:get_count() == 1 then
+			if filter.materials[item:get_name()] then
+				inv:set_stack("main", 1, {name = filter.materials[item:get_name()][1]})
+			else
+				meta:set_string("infotext", "[filter] This wont work...")
+			end
+		else
+			meta:set_string("infotext", "[filter] Put only one item in the filter!")
+		end
+	end,
+	
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("formspec", filter_form)
+		meta:set_string("infotext", "Filter")
+		local inv = meta:get_inventory()
+		inv:set_size("main", 1)
+	end,
+})