Nice one! I notice a few quirks:

if I select a file and press enter the @ stays alone (I would expect to at least see the file name). I would not expect enter to actually send the prompt but to behave just like tab (just adding file path into the input).

Then if I go to a directory with a lot of files (like my home) and try to start inputing some files, it hangs and I can't use my terminal anymore, not even Ctrl^C I have to kill my window:

It's good now, we can validate with "Enter" instead of "Tab". I used jwalk to simplify the code, and it's much more performant (there might still be some slowdowns, but it no longer blocks) 🙂

yes it is much faster indeed!
one question though, why it only matches against file?

Also I think it would probably make sense to not search through .* folder and maybe even blacklist some folder that would slow the searcher down like node_modules, or target/, etc.. It is a bit opinionated and less "generic" but I believe it would make it even faster for real world usecase. For instance I was looking for builder and got the target clutter first:

Yes, I thought about ignoring files starting with .* but that would also ignore useful ones like .gitignore, .github... I think by default I’ll ignore them, unless the search explicitly includes a '.'

what about ignoring build / libraries files ? do you want to do something or should I merge as is ?

I'm going to make some more changes. I think I'll ignore the files/folder in .gitignore

that's a pretty good idea!

whenever you are ready, I'll merge your branch but then I'll create a new one to clean input.rs that start to be a little bit messy :) but that will be another PR.

Yes, it's true that it's becoming a bit of a mess ;)

nice PR @MyEcoria !