Add io compatibility layer

....I can't believe that Lua doesn't have an inbuilt scandir 
equivalent?!

worldeditadditions/init.lua

@@ -18,6 +18,9 @@ wea.Queue = dofile(wea.modpath.."/utils/queue.lua")
 wea.LRU = dofile(wea.modpath.."/utils/lru.lua")
 wea.inspect = dofile(wea.modpath.."/utils/inspect.lua")
 
+-- I/O compatibility layer
+wea.io = dofile(wea.modpath.."/utils/io.lua")
+
 wea.bit = dofile(wea.modpath.."/utils/bit.lua")
 
 

worldeditadditions/utils/io.lua

@@ -0,0 +1,14 @@
+local io = {
+	-- Ref https://minetest.gitlab.io/minetest/minetest-namespace-reference/#utilities
+	scandir = function(dirpath)
+		return minetest.get_dir_list(dirpath, nil)
+	end,
+	scandir_files = function(dirpath)
+		return minetest.get_dir_list(dirpath, false)
+	end,
+	scandir_dirs = function(dirpath)
+		return minetest.get_dir_list(dirpath, true)
+	end,
+}
+
+return io

worldeditadditions/utils/strings/split.lua

@@ -62,7 +62,7 @@ end
 -- @param	plain	boolean	If true (or truthy), pattern is interpreted as a
 -- 							plain string, not a Lua pattern
 -- @returns	table	A sequence table containing the substrings
-function worldeditadditions.split (str,dlm,plain)
+function worldeditadditions.split(str,dlm,plain)
 	local pos, ret = 0, {}
 	local ins, i = str:find(dlm,pos,plain)
 	-- "if plain" shaves off some time in the while statement