Improves matching filenames

[angerman]

We currently only match on the file name. If multiple candidates exist,
this patch tries to compare their parent directry to find a better match.

[angerman]

This is quite bad. Any suggestions / feedback how to do this better is welcome.

[angerman]

Ideally I think the function should look like:

bestMatch :: FilePath -> [(FilePath, Builder)] -> (FilePath, Builder)

[snowleopard]

@angerman Thanks! I'll experiment with this and see how your solution can be improved.

Does this solve the unix problem for you?

[angerman]

Yes. Now stuck with integer-gmp, see #71.

[angerman]

Improved the matching. We basically generate all possible suffixes and try to find the match with the longest suffix.

[snowleopard]

@angerman Please test 6c80bd8. I think it is more robust because we know exactly what we match: generated file without the buildPath prefix. No need to try different possible suffixes. It's also simpler.

[snowleopard]

Sorry, another small fix: 26cd11f.

[snowleopard]

I think we can close this now.