Could probably be done by using the path of your note. You could manually specify the code for directories (such as M5 for math-5) and subsequent codes could be

Could probably be done by using the path of your note. You could manually specify the code for directories (such as M5 for math-5) and subsequent codes could be based on that. Your code would then be {dir code}-{random letters original to the note}. Directory codes could also be nested with this