How to stage only part of a new file with git?

Question

I love git add --interactive. It is now part of my daily workflow.

The problem seems that it does not work with untracked files. What I wan

Answer 1

Whoa, all that update-index and hash-object business seems overly complicated. How about this instead:

git add -N new_file
git add -i

From git help add:

-N, --intent-to-add
    Record only the fact that the path will be added later.  An entry
    for the path is placed in the index with no content.  This is useful
    for, among other things, showing the unstaged content of such files
    with git diff and committing them with git commit -a.