Small patch for ffap.el

[Philipp Stephani <p.stephani2@gmail.com>]

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Hi,

attached is a small patch that documents the fact that functions in
ffap-alist can use the match data. This is already used by ffap.el itself,
e.g. in ffap-rfc.

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From 8dd624c8ac179d5381e00c04358d353866f60f9f Mon Sep 17 00:00:00 2001
From: Philipp Stephani <phst@google.com>
Date: Tue, 3 Jan 2017 17:19:36 +0100
Subject: [PATCH] Document that functions in 'ffap-alist' can use the match
 data

* lisp/ffap.el (ffap-alist): Document that ffap sets the match data
while walking 'ffap-alist'.
---
 lisp/ffap.el | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lisp/ffap.el b/lisp/ffap.el
index 76e86ef..c1fab70 100644
--- a/lisp/ffap.el
+++ b/lisp/ffap.el
@@ -792,7 +792,10 @@ ffap-alist
   KEY is a symbol, and it equals `major-mode', or
   KEY is a string, it should match NAME as a regexp.
 On a match, (FUNCTION NAME) is called and should return a file, an
-URL, or nil.  If nil, search the alist for further matches.")
+URL, or nil.  If nil, search the alist for further matches.
+While calling FUNCTION, the match data is set according to KEY if KEY
+is a string, so that FUNCTION can use `match-string' and friends
+to extract substrings.")
 
 (put 'ffap-alist 'risky-local-variable t)
 
-- 
2.8.0.rc3.226.g39d4020