Uninstall subtlety & how I fixed a Watchman hang

[onpaws]

First off wanted to say thanks to everyone involved in this excellent app!

This issue involves both the Homebrew formula and watchman.

Today something in my watchman state dir caused a hang[1] just like #358 (comment).
I also solved by #358 (comment).

Confusingly (to me), brew uninstall watchman didn't touch that directory.
On the one hand, it would have saved me a few hours today. On the other hand, @wez based on your #358 (comment) it sounds like that folder is potentially valuable for debugging.

Inside I see a log file (helpful) but also pid/state/socket, the inclusion of which in brew uninstall could have saved me this trouble.

@Jerzerak, @wez, (any other maintainers): thoughts? how do other packages handle this?
Is there a brew uninstall -complete $PACKAGE or something?
My naive thought: feels like a good compromise may be retaining/leaving the logfile but removing the rest.

---

[1] Launching the RN Packager, watchman watch-del-all or react-native start --reset-cache all just hung (kind of like running cat by itself).

React Native 0.33, OS X 10.11.6, Homebrew 0992951, node 6.5.0

[onpaws]

Bonus naive thought: What are the implications in simply keeping the state in /tmp/?

I ask because during my troubleshooting I had tried rebooting and as you can imagine it didn't make a difference.

[wez]

This is a duplicate of #358, so I'm closing this in favor of that. I'll add some comments to answer some of your questions over there so that we don't fragment into too many threads.