wea.table_unique(): Add API function

worldeditadditions/utils/tables.lua

@@ -79,3 +79,22 @@ function worldeditadditions.table_map(tbl, func)
 	end
 end
 
+--- Builds a new table with the elements of the given table appearing at most once.
+-- @param	tbl		table	The table of values to make unique.
+-- @returns	table	A new table containing the values of the given table appearing at most once.
+function worldeditadditions.table_unique(tbl)
+	local newtbl = {}
+	for i,value in ipairs(tbl) do
+		local seen = false
+		for j,seenvalue in ipairs(newtbl) do
+			if value == seenvalue then
+				seen = true
+				break
+			end
+		end
+		if not seen then
+			table.insert(newtbl, value)
+		end
+	end
+	return newtbl
+end