Description Robin Stocker 2014-09-17 09:46:52 EDT

DiffCommand has the following methods for controlling what should be compared:

  setOldTree(AbstractTreeIterator oldTree)
  setNewTree(AbstractTreeIterator newTree)

For doing a simple "git diff HEAD", the caller needs to do this to get oldTree:

  ObjectId head = repo.resolve(Constants.HEAD + "^{tree}");
  CanonicalTreeParser oldTree = new CanonicalTreeParser();
  ObjectReader reader = db.newObjectReader();
  try {
  	oldTree.reset(reader, head);
  } finally {
  	reader.release();
  }

Instead, we should have API that allows the caller to pass a String which we resolve to a tree, e.g. "HEAD", or "master".