Add all usefull helper function from lua_api.txt

mesecons_luacontroller/init.lua

@@ -231,6 +231,16 @@ local function safe_string_find(...)
 	return string.find(...)
 end
 
+-- do not allow pattern matching in string.split (see string.find for details)
+local function safe_string_split(...)
+	if select(5, ...) then
+		debug.sethook() -- Clear hook
+		error("string.split: 'sep_is_pattern' (fifth parameter) may not be used in a Luacontroller")
+	end
+
+	return string.split(...)
+end
+
 local function remove_functions(x)
 	local tp = type(x)
 	if tp == "function" then
@@ -463,6 +473,7 @@ local function create_environment(pos, mem, event, itbl, send_warning)
 			reverse = string.reverse,
 			sub = string.sub,
 			find = safe_string_find,
+			split = safe_string_split,
 		},
 		math = {
 			abs = math.abs,
@@ -475,10 +486,12 @@ local function create_environment(pos, mem, event, itbl, send_warning)
 			cosh = math.cosh,
 			deg = math.deg,
 			exp = math.exp,
+			factorial = math.factorial,
 			floor = math.floor,
 			fmod = math.fmod,
 			frexp = math.frexp,
 			huge = math.huge,
+			hypot = math.hypot,
 			ldexp = math.ldexp,
 			log = math.log,
 			log10 = math.log10,
@@ -490,6 +503,7 @@ local function create_environment(pos, mem, event, itbl, send_warning)
 			rad = math.rad,
 			random = math.random,
 			sin = math.sin,
+			sing = math.sign,
 			sinh = math.sinh,
 			sqrt = math.sqrt,
 			tan = math.tan,
@@ -497,9 +511,14 @@ local function create_environment(pos, mem, event, itbl, send_warning)
 		},
 		table = {
 			concat = table.concat,
+			copy = table.copy,
+			indexof = table.indexof,
 			insert = table.insert,
+			insert_all = table.insert_all,
+			key_value_swap = table.key_value_swap,
 			maxn = table.maxn,
 			remove = table.remove,
+			shuffle = table.shuffle,
 			sort = table.sort,
 		},
 		os = {
@@ -508,6 +527,24 @@ local function create_environment(pos, mem, event, itbl, send_warning)
 			time = os.time,
 			datetable = safe_date,
 		},
+		dump2 = dump2,
+		dump = dump,
+		minetest = {
+			wrap_text = minetest.wrap_text,
+			pos_to_string = minetest.pos_to_string,
+			string_to_pos = minetest.string_to_pos,
+			string_to_area = minetest.string_to_area,
+			formspec_escape = minetest.formspec_escape,
+			is_yes = minetest.is_yes,
+			is_nan = minetest.is_nan,
+			get_us_time = minetest.get_us_time,
+			parse_json = minetest.parse_json,
+			write_json = minetest.write_json,
+			rgba = minetest.rgba,
+			encode_base64 = minetest.encode_base64,
+			decode_base64 = minetest.decode_base64,
+		},
+		vector = vector,
 	}
 	env._G = env
 
@@ -901,4 +938,3 @@ minetest.register_craft({
 		{'group:mesecon_conductor_craftable', 'group:mesecon_conductor_craftable', ''},
 	}
 })
-