added a very simple clan system

mods/clans/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

mods/clans/init.lua

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+clans = {}
+clans.all_clans = {}
+clans.clans_file = minetest.get_worldpath() .. "/clans"
+
+function clans.create_clan(plname, clan_name)
+	clans.all_clans[clan_name] = {plname}
+	clans.save_clans()
+end
+
+function clans.add_member(clan_name, plname)
+	table.insert(clans.all_clans[clan_name], plname)
+	clans.save_clans()
+end
+
+function clans.load_clans()
+	local input = io.open(clans.clans_file, "r")
+	if input then
+		local str = input:read()
+		if str then
+			if minetest.deserialize(str) then
+				clans.all_clans = minetest.deserialize(str)
+			end
+		end
+		io.close(input)
+	end
+end
+
+function clans.save_clans()
+	if clans.all_clans then
+		local output = io.open(clans.clans_file, "w")
+		local str = minetest.serialize(clans.all_clans)
+		output:write(str)
+		io.close(output)
+	end
+end
+
+clans.load_clans()
+
+minetest.register_chatcommand("create_clan", {
+	params = "<name>",
+	description = "Creates a clan",
+	privs = {},
+	func = function(name, text)
+		if clans.all_clans[text] then 
+			return true, "There already is a clan named " .. text
+		end	
+		local player = minetest.get_player_by_name(name)
+		if player then	
+			clans.create_clan(name, text)
+			return true, "Added a clan named " .. text
+		end
+		return true, "Error couldnt find player " .. name
+	end,
+})
+
+minetest.register_chatcommand("join_clan", {
+	params = "<name>",
+	description = "Join a clan",
+	privs = {},
+	func = function(name, text)
+		if not clans.all_clans[text] then 
+			return true, "There is no clan named " .. text
+		end	
+		local player = minetest.get_player_by_name(name)
+		if player then	
+			clans.add_member(text, name)
+			return true, "Joined clan " .. text
+		end
+		return true, "Error couldnt find player " .. name
+	end,
+})
+
+

mods/clans/init.lua~

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+clans = {}
+clans.all_clans = {}
+clans.clans_file = minetest.get_worldpath() .. "/clans"
+
+function clans.create_clan(plname, clan_name)
+	clans.all_clans[clan_name] = {plname}
+	clans.save_clans()
+end
+
+function clans.add_member(clan_name, plname)
+	table.insert(clans.all_clans[clan_name], plname)
+	clans.save_clans()
+end
+
+function clans.load_clans()
+	local input = io.open(clans.clans_file, "r")
+	if input then
+		local str = input:read()
+		if str then
+			if minetest.deserialize(str) then
+				clans.all_clans = minetest.deserialize(str)
+			end
+		end
+		io.close(input)
+	end
+end
+
+function clans.save_clans()
+	if clans.all_clans then
+		local output = io.open(clans.clans_file, "w")
+		local str = minetest.serialize(clans.all_clans)
+		output:write(str)
+		io.close(output)
+	end
+end
+
+clans.load_clans()
+
+minetest.register_chatcommand("create_clan", {
+	params = "<name>",
+	description = "Creates a clan",
+	privs = {},
+	func = function(name, text)
+		if clans.all_clans[text] then 
+			return true, "There already is a clan named " .. text
+		end	
+		local player = minetest.get_player_by_name(name)
+		if player then	
+			clans.create_clan(name, text)
+			return true, "Added a clan named " .. text
+		end
+		return true, "Error couldnt find player " .. name
+	end,
+})
+
+minetest.register_chatcommand("join_clan", {
+	params = "<name>",
+	description = "Join a clan",
+	privs = {},
+	func = function(name, text)
+		if not clans.all_clans[text] then 
+			return true, "There is no clan named " .. text
+		end	
+		local player = minetest.get_player_by_name(name)
+		if player then	
+			clans.add_member(text, name)
+			return true, "Joined clan " .. text
+		end
+		return true, "Error couldnt find player " .. name
+	end,
+})
+
+