Get a list of all rules

[hasufell]

I don't see a way to do this. Am I missing something?

Ultimately this would be the start of a proper help rule, showing available rules, their description and possibly valid environment variables.

[ndmitchell]

No way to do that, but a great idea. Also a StackOverflow question at https://stackoverflow.com/questions/52749184/is-there-a-way-to-get-shake-build-system-to-show-all-the-rules-that-were-gener/52779484. Certainly on the list!

My best idea is some kind of addRuleName :: String -> Rules () and just accumulate them in Rules - and then have phony etc automatically populate them.

[ndmitchell]

Done as part of #625 - just call getTargets or --help.