Add option to add hidden files

[CristianCantoro]

Currently ick ignores hidden files. I suggest adding an option -H, --add-hidden to consider them.

I am not entirely sure what shuld be the behavior when using check or diff, I have tried an implementation here: CristianCantoro/integrity-checker/tree/dev/hidden

[elliottslaughter]

In general this is something I'm happy to approve.

As I mentioned in #3 (comment) we use the ignore crate, which theoretically ought to provide all the options to do this.

One minor point of bikeshedding: since ripgrep will already have names for all of these options (since that's what the ignore crate was created for) it would probably be good to reuse those names so we're using consistent naming with the rest of the ecosystem.

I'm not sure when I'll have time to look at this, maybe in the next couple weeks. If it's a simple change I can potentially look at it sooner.

[CristianCantoro]

@elliottslaughter wrote:

One minor point of bikeshedding: since ripgrep will already have names for all of these options (since that's what the ignore crate was created for) it would probably be good to reuse those names so we're using consistent naming with the rest of the ecosystem.

I see that in ripgrep the option is called --hidden, I am not sure that we should be that attached to the semantics of another program and have clear names for the options of ick.

[elliottslaughter]

I'm open to other suggestions. ripgrep is hardly universal, so I'm fine with going a different way. However, the further we go (semantically) the more work we'll have to do ourselves that will not be supported out of the box by the ignore crate.

Another program that's relevant (as far as precedent goes) is probably tar, which has flags --include and --exclude (but as far as I know doesn't have anything based on a .gitignore syntax or similar).

We could also look at other backup programs, though I'm not as familiar with those or how they handle this.