Sandbox build support

[snoyberg]

This isn't quite ready yet, I still need to get it working correctly with Stackage. I just wanted to send this pull request so you know I'm playing around with this already. I'll ping you on this request when I think it's ready. If you have any comments on the approach I'm taking, let me know.

[sol]

@snoyberg Nice. Actually, I started to work on this, too. But as I do TDD, I started with the test case. So there is no duplicate work yet :)

I'll be away from my box in 10 minutes, so I'll probably apply it tomorrow.

[snoyberg]

Very cool! I just tested this some more, and it looks like it solves the problem with Stackage. I'm going to try a larger build now and see if everything works.

[sol]

@snoyberg I implemented the test.

I'd still tend to rename the env var to DOCTEST_something, e.g. DOCTEST_PACKAGE_SANDBOX if this works for you?

Anything else that we need to sort out before applying this?

[snoyberg]

Thanks for including this. The reason I think we shouldn't name this variable DOCTEST is I think it's relevant beyond doctest. For example, I'd like to see cabal-dev set this in general, and other tools like Fay to use it.

[sol]

@snoyberg Ok, makes sense. But would then HASKELL_PACKAGE_SANDBOX be more appropriate? I don't care too much, I still have the guts feeling that PACKAGE_SANDBOX may be too generic, not sure?

[snoyberg]

Yes, I prefer HASKELL_PACKAGE_SANDBOX. I'll update Stackage to use that.

[sol]

@snoyberg @jwiegley Released to Hackage as doctest-0.9.4.

[snoyberg]

Works like a charm, all of Stackage just built cleanly. Thanks!

[jwiegley]

Simon Hengel notifications@github.com writes:

@snoyberg @jwiegley Released to Hackage as doctest-0.9.4.

Running tests again now.

John Wiegley
FP Complete Haskell tools, training and consulting
http://fpcomplete.com johnw on #haskell/irc.freenode.net