add dependency filter regex

[uforic]

Howdy @JamieMason , thanks for providing syncpack to the JavaScript community!

I'd like your feedback on this pull request. I work at a company that would like to use this tool, but we need it to support one more feature: the ability to only sync certain packages.

The use case is: Our root packages.json has a number of dependencies that we don't want to sync with child folders that contain package.json files; we selectively would like to enable the packages that we sync.

The current workaround we use is to pipe the output of the syncpackage "list" command into a script that has these dependencies of interest hardcoded, and checks to make sure the version list length for those dependencies is not > 1. We figured this PR would be a better solution and one that would be useful to others, too.

The reason I chose a regex instead of list of exact string matches is that we have instances where we'd like to sync all internal packages, say @companyname/.*, and the regex seems less fragile than hardcoding one packages at a time.

Let me know if there's anything I can do to make it easier to review on your end. Thanks!

[JamieMason]

Thanks a lot @uforic! I am away in Holland at the moment and again next week but I will take a look at this as soon as I can. Always great to receive PRs, so thank you very much.

[uforic]

Howdy @JamieMason , just wanted to put this back on your radar! Totally understood if you haven't had a chance to take a look at it, we're just trying to avoid forking if we can🍴

[JamieMason]

Thanks very much @uforic for contributing, very much appreciated and this has been merged 👍

[uforic]

Thanks @JamieMason !