Writing a sample Javascript driver pointed out some extra
whitespace handling that needed to be done in the diff driver.
This adds some tests with some sample javascript code that I
pulled off of GitHub just to see what would happen. Also, to
clean up the userdiff test data, I did a "git gc" and packed
up the test objects.
Since I don't have permission yet on the code from Git, I decided
I'd take a stab at writing patterns for PHP and Javascript myself.
I think these are pretty weak, but probably better than the
default behavior without them.
I contacted a number of Git authors and lined up their permission
to relicense their work for use in libgit2 and copied over their
code for diff driver xfuncname patterns. At this point, the code
I've copied is taken verbatim from core Git although Thomas Rast
warned me that the C++ patterns, at least, really need an update.
I've left off patterns where I don't feel like I have permission
at this point until I hear from more authors.
