git-diff new files (without using index)

[Miles Bader <miles@gnu.org>]

One thing I often want to do is generate a complete diff of all changes,
including new/removed files.

If I add things to the index, I can use "git-diff --cached" to do it;
however I'd actually like to be able to do this _without_ updating the
index; in other words, any un-added new file as a change.  As it is, the
"non-indexed" state seems kind of a second-class citizen, as you can
never have new files there (or rather, git will never really see them).

Is there anyway to do this currently?  If not, maybe something like a
"git-diff -N" (mirroring diff's -N/--new-file option) option could be
added to do this?

Thanks,

-Miles
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