Move examples to data-files section

[xsebek]

Otherwise, change to example would cause recompilation.

[xsebek]

Ah, I guess we have it in extra-source-files because it is not in data directory?

Maybe we could workaround it by a symlink? EDIT: Or by inlining datadir to others as I did.

[byorgey]

Can you explain in more detail? I'm not sure I understand the problem we're trying to solve here.

[xsebek]

@byorgey, if you want to iterate on a swarm file in the example directory, Cabal will check each library to see if it needs recompiling because the example is listed in extra sources. At least, that is my hypothesis based on observation. 🙂

[byorgey]

Seems fine to me. I think data-files get installed in a special location when cabal install runs, which is irrelevant for example, but I don't think it matters that much.

[byorgey]

Hmm, actually, now I am not so sure. I think the reason the tests are failing is that they are looking for the example directory---which isn't there because only things listed in extra-source-files get unpacked into the source tree when building + running tests. That also means if someone does cabal get they will no longer get the example directory. extra-source-files actually seems like the right place for it.