how to do directory renames in fast-import

Git can track file renames implicitly. If I delete and then add (under a different name) the same content, git will figure that out.

But if a directory was renamed, I have no way to tell fast-import about it. I can't delete the directory (using a 'D' command) and then add it back (with a different name) with all its contents, because my source material (an svn dump file) doesn't tell me, at that point, about all the files involved because nothing about them has changed.

fast-import knows about the contents of the directory I want to rename, but doesn't give me a primitive to do the rename. Is this something we need to add? My frontend could keep track of this, but I would duplicating work that fast-import is already doing.

Cheers,

- David