not all gitignore syntax is covered

[HyperCodec]

There's still all kinds of regex syntax that is not covered by the gitignore parser thingy.

[HyperCodec]

Consider https://docs.rs/git2/latest/git2/struct.Status.html#method.is_ignored

[HyperCodec]

https://docs.rs/git2/latest/git2/struct.Repository.html#method.statuses

[HyperCodec]

So essentially let statuses = repo.statuses(); and then let files_filtered: Vec<_> = old_files.into_iter().filter(|f| !statuses.get(f.path()).is_ignored()).collect()