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bug#21851: (no subject)

From: Tino Calancha
Subject: bug#21851: (no subject)
Date: Wed, 27 Apr 2016 20:13:27 +0900 (JST)
User-agent: Alpine 2.20 (LRH 67 2015-01-07)

Hi Lars,

i think this thread should be considered a wish list; the
doc. string doesn't say that PATCH-BUF could be a buffer name:

"If optional PATCH-BUF is given, use the patch in that buffer
and don't ask the user."

So in principle there is nothing wrong if
(epatch nil "buffer-name")
signal an error.  In fact, most of the folks would call this
function interactively, so there would not be issue at all.

*) If we prefer to keep the code as it is, maybe is worth to remark
   in the doc. string the type of PATCH-BUF, someting like:

"If optional arg PATCH-BUF non-nil, then it is a buffer containing
the patch; use that patch and don't ask the user."

*) We may extend this function, so that, PATCH-BUF is a buffer
   or the name of a buffer, like in many others functions in emacs.
   Following patch do that:

diff --git a/lisp/vc/ediff.el b/lisp/vc/ediff.el
index 71099ab..f9f2370 100644
--- a/lisp/vc/ediff.el
+++ b/lisp/vc/ediff.el
@@ -1367,7 +1367,9 @@ ediff-patch-file
     (require 'ediff-ptch)
     (setq patch-buf
-          (if arg (prefix-numeric-value arg)) patch-buf))
+          (and arg (prefix-numeric-value arg))
+           (and (or (stringp patch-buf) (bufferp patch-buf))
+                (get-buffer patch-buf))))
     (setq source-dir (cond (ediff-use-last-dir ediff-last-dir-patch)
                           ((and (not ediff-patch-default-directory)
                                 (buffer-file-name patch-buf))

"GNU Emacs (x86_64-pc-linux-gnu, GTK+ Version 2.24.30)
 of 2016-04-27"

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