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Patch parser

From: Lars Magne Ingebrigtsen
Subject: Patch parser
Date: Tue, 09 Dec 2014 20:20:38 +0100
User-agent: Gnus/5.130012 (Ma Gnus v0.12) Emacs/25.0.50 (gnu/linux)

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

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 

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

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