tagfs

While I don't remember that specific project's name, I do remember that a lot of that was possible because files in a filesystem often aren't just some hierarchical folder structure. There is often a tree-like structure to be able to find a single file quickly amongst many files, but there was no technical reason why it wouldn't also support off-tree indexing based on tags. I imagine one of the problems you'd run in to is mass updates since deleting a directory with many files in it below a single tree node is very much limited to that part of the filesystem's tree, but doing it with tags causes updates all over the place. It does remind me of this more metadata-like FS: https://github.com/marook/tagfs As well as the thing Apple does in Finder where it has a tag database and dynamic 'tag' directories where it shows you everything that was

> It might be tempting to try to maintain multiple directory structures, making use of hard or soft links into the code base, but this sounds like it might be fragile, not to mention hard work to maintain. There are a lot of projects organised around automating this maintenance—though they tend to pop in and out of existence, so I'd agree we're not at the state of having a reliable solution that'll be around next year, or next month. TagFS (https://github.com/marook/tagfs) is the system with which I've been familiar most recently, but it appears to have been dormant for four years.