Vigilo is a dead-simple file system watcher for Ruby.
Vigilo::Watcher.watch(dir1, dir2) do |changed, added, deleted| # created is an Array of files changed, or nil if none changed # added is an Array of files added, or nil if none added # deleted is an Array of files deleted, or nil if none deleted end
You can also start a watch inside a thread to keep it going in the background.
On my Mac, the portable (polling) backend used 2.5% CPU while the FSEvents backend used 0.4% CPU.
Vigilo is brand new and currently only has support for FSEvents and File System polling. Support for inotify is coming.
At the moment, I have only tested it on my local machine and the final API isn't in place, so feel free to look, but don't rely on anything just yet.
Tests are in progress.