Script to Scrape Usernames who Commented on a Vanilla Forum Thread

Looking for a quick script that can allow us to enter a forum URL (for a Vanilla based forum), and the script should go to every page of the thread and spit out the usernames who commented on that thread, along with how many times each user has commented in that thread. It should sort the usernames by highest to lowest number of comments they have made in that particular thread.

This should take less than an hour for an experienced developer to make, its a very simple task. I am not particular about the language you choose to use to accomplish this, as long as it gets us the end result.