[jgit-dev] rename detection working

["Shawn O. Pearce" <spearce@xxxxxxxxxxx>]

Folks, we now have rename detection in JGit.  Its working pretty
well already.  It could be faster, blah blah blah, but it seems
pretty solid thus far.

For example:

$ jgit log --name-status --follow builtin/fsck.c | grep ^R
R100	builtin-fsck.c	builtin/fsck.c
R099	fsck.c	builtin-fsck.c
R099	fsck-objects.c	fsck.c
R099	fsck-cache.c	fsck-objects.c

:-)

The code to use it is pretty simple.  Assuming you already have a
properly configured TreeWalk for the difference you want to view:

  RenameDetector rd = new RenameDetector(repository);
  rd.addAll(DiffEntry.scan(tw));
  List<DiffEntry> files = rd.compute();

And then traverse over that file set.  Since compute can be very
long running (due to the O(N^2) nature of the rename algorithm),
you can also pass it a ProgressMonitor.

Patches are on Gerrit pending review.  Some major highlights from
the series are:

  http://egit.eclipse.org/r/1048 : bulk of the rename detector
  http://egit.eclipse.org/r/1055 : log --follow

-- 
Shawn.