Organize builtin into subdirectories

builtin/init.lua

@@ -0,0 +1,34 @@
+--
+-- This file contains built-in stuff in Minetest implemented in Lua.
+--
+-- It is always loaded and executed after registration of the C API,
+-- before loading and running any mods.
+--
+
+local core = minetest or engine
+minetest = core
+
+-- Initialize some very basic things
+print = core.debug
+math.randomseed(os.time())
+os.setlocale("C", "numeric")
+
+-- Load other files
+local scriptdir = core.get_builtin_path()..DIR_DELIM
+local gamepath = scriptdir.."game"..DIR_DELIM
+local commonpath = scriptdir.."common"..DIR_DELIM
+local asyncpath = scriptdir.."async"..DIR_DELIM
+
+dofile(commonpath.."serialize.lua")
+dofile(commonpath.."misc_helpers.lua")
+
+if INIT == "game" then
+	dofile(gamepath.."init.lua")
+elseif INIT == "mainmenu" then
+	dofile(core.get_mainmenu_path()..DIR_DELIM.."init.lua")
+elseif INIT == "async" then
+	dofile(asyncpath.."init.lua")
+else
+	error(("Unrecognized builtin initialization type %s!"):format(tostring(INIT)))
+end
+