Feature request: Ability to pass a function to ignore

[Ajedi32]

To make the current system for ignoring files much more powerful, it would be great if we could pass a function to ignore instead of just minimatch strings. The function would take in the file path and lstat object, and return true to ignore the file, or false to keep it.

This would add a lot of power to recursive-readdir's ignore system, addressing both the use cases of #14 and my comments on e2f2ea0 in one fell swoop. It would also really help with some of the problems we've discussed in #23.

[Ajedi32]

Also, just to note: I'm willing to contribute a PR here if you think this is a feature you'd be willing to add.

[jergason]

This would be fantastic. I'm a bit wary of complicating a dirt-simple module by trying to support more complex ignoring behaviors, and as you can see I've already added some wonkiness trying to do so.

[Ajedi32]

Awesome. I'll look into this and probably submit a PR over the weekend. Seems like it should be pretty straightforward to implement.