bug#24317: 25.1.50; image-dired-rotate-original: regexp doesn't match .jpeg suffix

[Tino Calancha <tino.calancha@gmail.com>]

> In that case, why not make a function that does the string-match as
> well, in which case you won't need a variable, because it will appear
> in a single place, and will also have the test localized to a single
> function?
>
> Thanks.
I see.  Its good idea.
I have choose a defsubst because it is small function.  I am not sure
if it is recommended or if people prefers always defun's.
Please, et me know if the doc string reads weird and need some tunning

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From 0be47e3968d898bf8f44e5c37f9035be3147a4a2 Mon Sep 17 00:00:00 2001
From: Tino Calancha <tino.calancha@gmail.com>
Date: Sat, 27 Aug 2016 18:16:25 +0900
Subject: [PATCH] image-dired-rotate-original: Fix regexp typo

* lisp/image-dired.el (image-dired-jpeg-file-p): New defsubst;
Return non-nil if a file has a JPEG extension.
(image-dired-rotate-original, image-dired-get-exif-file-name):
Use it (Bug#24317).
---
  lisp/image-dired.el | 8 ++++++--
  1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lisp/image-dired.el b/lisp/image-dired.el
index 67b023d..7c8d43b 100644
--- a/lisp/image-dired.el
+++ b/lisp/image-dired.el
@@ -1205,6 +1205,10 @@ image-dired-dired-file-marked-p
      (beginning-of-line)
      (not (looking-at "^ .*$"))))

+(defsubst image-dired-jpeg-file-p (file)
+  "Return non-nil if FILE has a JPEG extension."
+  (string-match-p "\\.[Jj][Pp][Ee]?[Gg]$" (expand-file-name file)))
+
  (defun image-dired-modify-mark-on-thumb-original-file (command)
    "Modify mark in dired buffer.
  COMMAND is one of `mark' for marking file in dired, `unmark' for
@@ -1912,7 +1916,7 @@ image-dired-rotate-original
        (message "No image at point")
      (let ((file (image-dired-original-file-name))
            command)
-      (if (not (string-match "\\.[jJ][pP[eE]?[gG]$" file))
+      (if (not (image-dired-jpeg-file-p file))
            (error "Only JPEG images can be rotated!"))
        (setq command (format-spec
                       image-dired-cmd-rotate-original-options
@@ -1952,7 +1956,7 @@ image-dired-get-exif-file-name
  YYYY_MM_DD_HH_MM_DD_ORIG_FILE_NAME.jpg.  Used from
  `image-dired-copy-with-exif-file-name'."
    (let (data no-exif-data-found)
-    (if (not (string-match "\\.[Jj][Pp][Ee]?[Gg]$" (expand-file-name 
file)))
+    (if (not (image-dired-jpeg-file-p file)))
          (progn
            (setq no-exif-data-found t)
            (setq data
-- 
2.9.3

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