Patch parser

[Lars Magne Ingebrigtsen <larsi@gnus.org>]

Does Emacs have a patch parser?  I mean, something that would take a
region of text and return all the pertinent parts of the patch it finds
there?

I've been digging through `diff-mode', and it's very geared towards
interactive use.  But I may well be missing something there.

My use case here is that I want to find out where to apply a patch
automatically for my new Super Maintainer Mode thing.

*** lisp/international/characters.el	2013-01-01 21:37:17.000000000 +0100
--- lisp/international/characters-fixc1.el	2013-02-18 17:58:29.103018508 +0100

should obviously be run from <top>/lisp with -p1 (or in <top> with -p0),
while this is in <top> with -p1:

--- a/lisp/net/eww.el
+++ b/lisp/net/eww.el

It's not rocket surgery to write this myself, but if it already exists...

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no