Recursive directory monitoring -> inconsistent behavior

[jagreenwood]

When working with this library on macOS and Linux, I'm seeing a difference in behavior between the two regarding recursive monitoring of directories.

Given the scenarios:

1. watch a directory, add a file to directory
2. watch a directory with a subdirectory, add a file to subdirectory
3. watch a directory, add a subdirectory, add a file

	1	2	3
macOS	✅	✅	✅
Linux	✅	❌	❌

The reason for this difference is because the inotify C library does not automatically support recursion.

Inotify monitoring of directories is not recursive: to monitor subdirectories
under a directory, additional watches must be created. This can take a significant 
amount time for large directory trees.

I'm not sure which is behaving as intended for the scope of this project, but would expect the behavior to be the same.

[KrisSimon]

Hi @jagreenwood
Thank you very much for raising this issue.

My favour would be a consistent behaviour in both (windows is still missing) worlds. Rarely you have to watch a full file tree, so I would go with mimic the linux way back to mac.

Would you like to open a fork and provide a pull request? <3

[jagreenwood]

I actually feel like macOS's behavior is more flexible making it more desirable. While increasing complexity, perhaps an implementation that takes a set of option flags would be a good path forward?
I'm afraid I don't have the bandwidth atm to look at this, but I can put it my queue to revisit :)

[KrisSimon]

It's on the roadmap!