gistfile1.cs

public class DiffTrees
{
    private IList<Tree> trees = new List<Tree>();

    public bool Recursive { get; set; }

    public void AddTree(Tree tree)
    {
        trees.Add(tree);
    }

    public IList<ChangeEntry> Diff()
    {
        if (trees.Count == 0)
            return new List<ChangeEntry>();

        var changes = new List<ChangeEntry>();
        var repos = trees.First().Repository;
        var walk = new TreeWalk(repos);

        walk.reset();
        walk.Recursive = Recursive;
        walk.setFilter(AndTreeFilter.create(TreeFilter.ANY_DIFF, TreeFilter.ALL));

        foreach (var tree in trees)
            walk.addTree(new CanonicalTreeParser(null, repos, tree.Id, new WindowCursor()));

        var numberOfTrees = walk.getTreeCount();
        while (walk.next())
        {
            var revisions = new List<RevisionDetails>();
            var path = walk.getPathString();
            var changeType = ChangeType.Modified;

            // create revision for each tree
            for (var i = 0; i < numberOfTrees; i++)
                revisions.Add(new RevisionDetails(walk.getFileMode(i), walk.getObjectId(i)));

            // TODO: Remove this hack - should support more than 2 trees
            if (numberOfTrees == 2)
            {
                // calculate change type (if not modified)
                var firstMode = walk.getRawMode(0);
                var secondMode = walk.getRawMode(1);

                if (firstMode == 0 && secondMode != 0)
                    changeType = ChangeType.Added;
                else if (firstMode != 0 && secondMode == 0)
                    changeType = ChangeType.Deleted;
                else if (firstMode != secondMode && walk.idEqual(0, 1))
                    changeType = ChangeType.ChangeOfType;
            }

            changes.Add(new ChangeEntry(path, changeType, revisions));
        }

        return changes;
    }

    public void OutputToConsole()
    {
        foreach (var change in Diff())
        {
            Console.Write(":");

            foreach (var rev in change.Revisions)
            {
                Console.Write(rev.FileMode.ToString().PadLeft(6, '0'));
                Console.Write(" ");
            }

            foreach (var rev in change.Revisions)
            {
                Console.Write(rev.Id);
                Console.Write(" ");
            }

            Console.Write(change.Type);
            Console.Write(" ");
            Console.WriteLine(change.Name);
        }
    }
}