git svn find-rev -- search for nearest SVN rev

I'm using git svn with a project that uses SubWCRev.exe to incorporate the SVN revision into the build number.

I've updated it to use 'git svn find-rev HEAD' in git svn usage, to achieve the same effect.

This works until I have a local commit that hasn't yet been pushed to SVN with 'git svn dcommit'. Then, 'git svn find-rev HEAD' returns nothing.

It would be really great if the '--before' and '--after' switches would work in this case. Then I could use 'git svn find-rev --before HEAD'.