bug#61639: 30.0.50; [PATCH] Do not error out on non image file in image-dired

[Manuel Giraud via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

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Hi,

This patch prevent errors when using image-dired on non image files.

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From 72f4dcd72d20fc2c0ead21300c0e2bff1795e8ee Mon Sep 17 00:00:00 2001
From: Manuel Giraud <manuel@ledu-giraud.fr>
Date: Sun, 19 Feb 2023 21:03:57 +0100
Subject: [PATCH] Do not error out on non image file

* lisp/image/image-dired.el
(image-dired--get-create-thumbnail-file): Do not error out but return
NIL for a non image file.
(image-dired-display-thumbs): Do not insert non image file and do
not display image-dired buffer if it is empty.
---
 lisp/image/image-dired.el | 37 ++++++++++++++++++++-----------------
 1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/lisp/image/image-dired.el b/lisp/image/image-dired.el
index cfcd1851188..60f2abd982a 100644
--- a/lisp/image/image-dired.el
+++ b/lisp/image/image-dired.el
@@ -411,19 +411,20 @@ image-dired-insert-image
 
 (defun image-dired--get-create-thumbnail-file (file)
   "Return the image descriptor for a thumbnail of image file FILE."
-  (unless (string-match-p (image-dired--file-name-regexp) file)
-    (error "%s is not a valid image file" file))
-  (let* ((thumb-file (image-dired-thumb-name file))
-         (thumb-attr (file-attributes thumb-file)))
-    (if (or (not thumb-attr)
-            (time-less-p (file-attribute-modification-time thumb-attr)
-                         (file-attribute-modification-time
-                          (file-attributes file))))
-        (image-dired-create-thumb file thumb-file)
-      (image-dired-debug "Found thumb for %s: %s"
-                         (file-name-nondirectory file)
-                         (file-name-nondirectory thumb-file)))
-    thumb-file))
+  (if (string-match-p (image-dired--file-name-regexp) file)
+      (let* ((thumb-file (image-dired-thumb-name file))
+             (thumb-attr (file-attributes thumb-file)))
+        (if (or (not thumb-attr)
+                (time-less-p (file-attribute-modification-time thumb-attr)
+                             (file-attribute-modification-time
+                              (file-attributes file))))
+            (image-dired-create-thumb file thumb-file)
+          (image-dired-debug "Found thumb for %s: %s"
+                             (file-name-nondirectory file)
+                             (file-name-nondirectory thumb-file)))
+        thumb-file)
+    (message "%s is not a valid image file" file)
+    (values)))
 
 (defun image-dired-insert-thumbnail ( file original-file-name
                            associated-dired-buffer image-number)
@@ -586,13 +587,15 @@ image-dired-display-thumbs
               (erase-buffer))
           (goto-char (point-max)))
         (dolist (file files)
-          (let ((thumb (image-dired--get-create-thumbnail-file file)))
+          (when-let ((thumb (image-dired--get-create-thumbnail-file file)))
             (image-dired-insert-thumbnail
              thumb file dired-buf
              (cl-incf image-dired--number-of-thumbnails)))))
-      (if do-not-pop
-          (display-buffer buf)
-        (pop-to-buffer buf))
+      (if (plusp image-dired--number-of-thumbnails)
+          (if do-not-pop
+              (display-buffer buf)
+            (pop-to-buffer buf))
+        (message "No images selected"))
       (image-dired--line-up-with-method)
       (image-dired--update-header-line))))
 
-- 
2.39.1


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In GNU Emacs 30.0.50 (build 1, x86_64-unknown-openbsd7.2, cairo version
 1.17.8) of 2023-02-19 built on computer
Repository revision: ff2109d7202ad2bbad00edd2a2ab21e4917ca7a3
Repository branch: mgi/image-dired-doc
Windowing system distributor 'The X.Org Foundation', version 11.0.12101006
System Description: OpenBSD computer 7.2 GENERIC.MP#1052 amd64

Configured using:
 'configure --prefix=/home/manuel/emacs --bindir=/home/manuel/bin
 --with-x-toolkit=no --without-sound --without-compress-install
 CPPFLAGS=-I/usr/local/include LDFLAGS=-L/usr/local/lib'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LCMS2 LIBOTF LIBXML2 MODULES NOTIFY KQUEUE OLDXMENU PDUMPER PNG RSVG
SQLITE3 THREADS TIFF TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM ZLIB

Important settings:
  value of $LC_ALL: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Dired by name

Minor modes in effect:
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  gnus-dired-mode: t
  display-time-mode: t
  display-battery-mode: t
  server-mode: t
  shell-dirtrack-mode: t
  repeat-mode: t
  desktop-save-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  buffer-read-only: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
/home/manuel/.emacs.d/elpa/ef-themes-0.10.0/theme-loaddefs hides /home/manuel/emacs/share/emacs/30.0.50/lisp/theme-loaddefs
/home/manuel/.emacs.d/elpa/transient-0.3.7/transient hides /home/manuel/emacs/share/emacs/30.0.50/lisp/transient

Features:
(find-dired ffap net-utils cl-print image-file image-converter
image-dired-dired image-dired image-dired-tags image-dired-external
image-dired-util dabbrev misearch multi-isearch shortdoc help-fns
radix-tree shr-color flow-fill gnus-cite gnus-async gnus-bcklg gnus-ml
gnus-topic mm-archive url-http url-gw url-cache url-auth qp utf-7 imap
rfc2104 nndoc nndraft nnmh nnfolder nnml gnus-agent gnus-srvr gnus-score
score-mode nnvirtual nntp gnus-cache nnrss w3m w3m-hist w3m-fb
bookmark-w3m w3m-ems w3m-favicon w3m-image tab-line w3m-proc w3m-util
network-stream nsm smtpmail textsec uni-scripts idna-mapping
ucs-normalize uni-confusable textsec-check mailalias shadow sort
mail-extr emacsbug whitespace magit-extras magit-patch pulse face-remap
magit-bookmark magit-submodule magit-obsolete magit-blame magit-stash
magit-reflog magit-bisect magit-push magit-pull magit-fetch magit-clone
magit-remote magit-commit magit-sequence magit-notes magit-worktree
magit-tag magit-merge magit-branch magit-reset magit-files magit-refs
magit-status magit magit-repos magit-apply magit-wip magit-log
which-func magit-diff smerge-mode diff git-commit log-edit pcvs-util
add-log magit-core magit-autorevert magit-margin magit-transient
magit-process with-editor magit-mode transient magit-git magit-section
magit-utils dash org-indent vc-dir ewoc vc mhtml-mode js c-ts-common
reveal pascal vc-hg conf-mode css-mode sgml-mode facemenu imenu
sh-script smie treesit executable oc-basic ol-eww eww url-queue mm-url
ol-rmail ol-mhe ol-irc ol-info ol-gnus nnselect ol-docview doc-view
jka-compr image-mode exif ol-bibtex bibtex ol-bbdb ol-w3m ol-doi
org-link-doi paredit edmacro gnus-dired autorevert filenotify vc-git
diff-mode bug-reference texinfo texinfo-loaddefs time battery exwm-randr
xcb-randr exwm-config ido exwm exwm-input xcb-keysyms xcb-xkb
exwm-manage exwm-floating xcb-cursor xcb-render exwm-layout
exwm-workspace exwm-core xcb-ewmh xcb-icccm xcb xcb-xproto xcb-types
xcb-debug kmacro server stimmung-themes modus-operandi-theme
modus-themes ytdious osm bookmark mingus libmpdee reporter edebug debug
backtrace transmission color calc-bin calc-ext calc calc-loaddefs rect
calc-macs w3m-load supercite regi ebdb-message ebdb-gnus gnus-msg
gnus-art mm-uu mml2015 mm-view mml-smime smime gnutls dig gnus-sum shr
pixel-fill kinsoku url-file svg dom gnus-group gnus-undo gnus-start
gnus-dbus gnus-cloud nnimap nnmail mail-source utf7 nnoo gnus-spec
gnus-int gnus-range message sendmail yank-media puny rfc822 mml mml-sec
epa epg rfc6068 epg-config mm-decode mm-bodies mm-encode mail-parse
rfc2231 rfc2047 rfc2045 ietf-drums gmm-utils mailheader gnus-win gnus
nnheader gnus-util mail-utils range mm-util mail-prsvr ebdb-mua ebdb-com
crm ebdb-format ebdb mailabbrev eieio-opt cl-extra help-mode speedbar
ezimage dframe eieio-base pcase timezone visual-basic-mode cl web-mode
derived disp-table erlang-start smart-tabs-mode skeleton cc-mode
cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars
cc-defs slime-asdf grep slime-tramp tramp tramp-loaddefs trampver
tramp-integration cus-edit cus-load wid-edit files-x tramp-compat shell
parse-time iso8601 ls-lisp slime-fancy slime-indentation slime-cl-indent
cl-indent slime-trace-dialog slime-fontifying-fu slime-package-fu
slime-references slime-compiler-notes-tree advice slime-scratch
slime-presentations bridge slime-macrostep macrostep slime-mdot-fu
slime-enclosing-context slime-fuzzy slime-fancy-trace
slime-fancy-inspector slime-c-p-c slime-editing-commands slime-autodoc
slime-repl slime-parse slime apropos compile text-property-search etags
fileloop xref project arc-mode archive-mode pp hyperspec thingatpt
slime-autoloads org-agenda org-element org-persist xdg org-id avl-tree
generator org-refile org ob ob-tangle ob-ref ob-lob ob-table ob-exp
org-macro org-src ob-comint org-pcomplete pcomplete comint ansi-osc
ansi-color ring org-list org-footnote org-faces org-entities time-date
noutline outline icons ob-emacs-lisp ob-core ob-eval org-cycle org-table
org-keys oc org-loaddefs find-func ol rx org-fold org-fold-core
org-compat org-version org-macs format-spec view mule-util cal-china
lunar solar cal-dst cal-bahai cal-islam cal-hebrew holidays
holiday-loaddefs vc-dispatcher vc-svn appt diary-lib diary-loaddefs
cal-menu calendar cal-loaddefs dired-aux dired-x dired dired-loaddefs
notifications dbus xml repeat easy-mmode desktop frameset
stimmung-themes-autoloads rust-mode-autoloads ebdb-autoloads
magit-autoloads debbugs-autoloads git-commit-autoloads
magit-section-autoloads ef-themes-autoloads with-editor-autoloads
paredit-autoloads dash-autoloads ytdious-autoloads
transmission-autoloads transient-autoloads exwm-autoloads
hyperbole-autoloads detached-autoloads info package browse-url url
url-proxy url-privacy url-expand url-methods url-history url-cookie
generate-lisp-file url-domsuf url-util mailcap url-handlers url-parse
auth-source cl-seq eieio eieio-core cl-macs password-cache json subr-x
map byte-opt gv bytecomp byte-compile url-vars cl-loaddefs cl-lib rmc
iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook
vc-hooks lisp-float-type elisp-mode mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode lisp-mode prog-mode register
page tab-bar menu-bar rfn-eshadow isearch easymenu timer select
scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors
frame minibuffer nadvice seq simple cl-generic indonesian philippine
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite emoji-zwj charscript
charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure
cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp
files window text-properties overlay sha1 md5 base64 format env
code-pages mule custom widget keymap hashtable-print-readable backquote
threads dbusbind kqueue lcms2 dynamic-setting system-font-setting
font-render-setting cairo xinput2 x multi-tty make-network-process
emacs)

Memory information:
((conses 16 1065525 388148)
 (symbols 48 64082 42)
 (strings 32 316403 24225)
 (string-bytes 1 9903231)
 (vectors 16 191008)
 (vector-slots 8 3234332 186563)
 (floats 8 1224 465)
 (intervals 56 21213 5652)
 (buffers 984 129))

-- 
Manuel Giraud