Track file modifications

[frank-lenormand]

Hi,

This might be redundant with #201, sorry in advance if that’s the case.

I would like to be able to run the callback upon file modifications (i.e. the contents have changed). Currently, even touch-ing a file triggers the shell command.

[samuelcolvin]

best to implement in your own code by reading the file.

[frank-lenormand]

If that had top be handled by code that wraps watchfiles, I might as well implement all of #201 myself and not use watchfiles at all.

The idea is to have the tool react to events, one of which is “file has changed”.

[samuelcolvin]

I don't that makes sense, watchfiles in python is hundreds of lines of code, I know this because it was written in python.

Determining if a file's content has changed in a callback is about 5 loc.

That being said, if you really need this in Rust, I'd be happy to review a PR.