functional, except saw, legacy, other compatability

stairsplus/util.lua

@@ -4,5 +4,22 @@ stairsplus.util = {
 			t[key] = value
 		end
 		return t
+	end,
+
+	table_is_empty = function(t)
+		return not next(t)
+	end,
+
+	table_sort_keys = function(t, sort_function)
+		local sorted = {}
+		for key in pairs(t) do
+			table.insert(sorted, key)
+		end
+		if sort_function then
+			table.sort(sorted, sort_function)
+		else
+			table.sort(sorted)
+		end
+		return sorted
 	end
 }