I love this article, as a long time ZSH user it's one of these things I've always wondered how they were implemented but never cared to investigate myself. It's

I love this article, as a long time ZSH user it's one of these things I've always wondered how they were implemented but never cared to investigate myself. It's really a clever hack too, if I had been asked to implement this feature my default approach would definitely have been to find a way to intercept the command's output somehow.