Watching a Folder in Rust with notify-rs — Hot Folder for PDF Automation

All tests run on an 8-year-old MacBook Air. Drop a PDF into a folder. By the time you look at your screen, it's already been processed. That's the Hot Folder feature — and it's powered by notify , a cross-platform file system watcher for Rust. Basic setup use notify ::{ Config , Event , RecommendedWatcher , RecursiveMode , Watcher }; use std :: path :: Path ; use std :: sync :: mpsc ; pub fn watch_folder ( folder : & Path , tx : mpsc :: Sender > , ) -> notify :: Result { let mut watcher = Re