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

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50; [PATCH] Do not error out on non image file in image-dired
Date: Sun, 19 Feb 2023 21:09:47 +0100

[Message part 1 (text/plain, inline)]

Hi,

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

[0001-Do-not-error-out-on-non-image-file.patch (text/x-patch, attachment)]

[Message part 3 (text/plain, inline)]

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:
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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

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Memory information:
((conses 16 1065525 388148)
 (symbols 48 64082 42)
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 (vectors 16 191008)
 (vector-slots 8 3234332 186563)
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 (intervals 56 21213 5652)
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-- 
Manuel Giraud

Message #8 received at 61639 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: 61639 <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50;
 [PATCH] Do not error out on non image file in image-dired
Date: Mon, 20 Feb 2023 14:49:00 +0200

> Date: Sun, 19 Feb 2023 21:09:47 +0100
> From:  Manuel Giraud via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> This patch prevent errors when using image-dired on non image files.

Why is it better to show a message than to signal an error?  The
former could go unnoticed, especially if some other message is shown
in the echo-area soon enough.

Message #11 received at 61639 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 61639 <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50; [PATCH] Do not error out on non image file
 in image-dired
Date: Mon, 20 Feb 2023 14:35:42 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

>> Date: Sun, 19 Feb 2023 21:09:47 +0100
>> From:  Manuel Giraud via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>> 
>> This patch prevent errors when using image-dired on non image files.
>
> Why is it better to show a message than to signal an error?  The
> former could go unnoticed, especially if some other message is shown
> in the echo-area soon enough.

I don't think it is better.  But for some image-dired usage, I do not
find it convenient.  Example: you carefully select some images from a
dired buffer and hit `C-t d' to see them in image-dired.  But your
selection was not correct and one of those file is not an image: you
receive an error (and have to correct your selection) and don't get to
see any of the correctly selected images.

So my idea was: yes, it is an error but it should not be one that
unwinds all.  Maybe it is a job for `warn' but having a *Warnings*
buffer that pop up is a bit too much too IMO.
-- 
Manuel Giraud

Message #14 received at 61639 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: 61639 <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50; [PATCH] Do not error out on non image file
 in image-dired
Date: Mon, 20 Feb 2023 15:46:48 +0200

> From: Manuel Giraud <manuel <at> ledu-giraud.fr>
> Cc: 61639 <at> debbugs.gnu.org
> Date: Mon, 20 Feb 2023 14:35:42 +0100
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> Date: Sun, 19 Feb 2023 21:09:47 +0100
> >> From:  Manuel Giraud via "Bug reports for GNU Emacs,
> >>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> >> 
> >> This patch prevent errors when using image-dired on non image files.
> >
> > Why is it better to show a message than to signal an error?  The
> > former could go unnoticed, especially if some other message is shown
> > in the echo-area soon enough.
> 
> I don't think it is better.  But for some image-dired usage, I do not
> find it convenient.  Example: you carefully select some images from a
> dired buffer and hit `C-t d' to see them in image-dired.  But your
> selection was not correct and one of those file is not an image: you
> receive an error (and have to correct your selection) and don't get to
> see any of the correctly selected images.

So maybe "C-t d" should filter the selected "images" before it calls
the function which errors out?

IOW, if the application doesn't want an API to fail for reasons
specific to the application, the onus of avoiding the error is on the
application, no?

Message #17 received at 61639 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 61639 <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50; [PATCH] Do not error out on non image file
 in image-dired
Date: Mon, 20 Feb 2023 15:13:37 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Manuel Giraud <manuel <at> ledu-giraud.fr>
>> Cc: 61639 <at> debbugs.gnu.org
>> Date: Mon, 20 Feb 2023 14:35:42 +0100
>> 
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>> 
>> >> Date: Sun, 19 Feb 2023 21:09:47 +0100
>> >> From:  Manuel Giraud via "Bug reports for GNU Emacs,
>> >>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>> >> 
>> >> This patch prevent errors when using image-dired on non image files.
>> >
>> > Why is it better to show a message than to signal an error?  The
>> > former could go unnoticed, especially if some other message is shown
>> > in the echo-area soon enough.
>> 
>> I don't think it is better.  But for some image-dired usage, I do not
>> find it convenient.  Example: you carefully select some images from a
>> dired buffer and hit `C-t d' to see them in image-dired.  But your
>> selection was not correct and one of those file is not an image: you
>> receive an error (and have to correct your selection) and don't get to
>> see any of the correctly selected images.
>
> So maybe "C-t d" should filter the selected "images" before it calls
> the function which errors out?

That is what `image-dired-show-all-from-dir' is doing: it selects files
from the given directory with the correct "image files" regexp and so no
non image will be present.

So your idea is to keep `image-dired--get-create-thumbnail-file' as is
and filter its input in `image-dired-display-thumbs'?  But then we won't
get any message or error that something was not an image (this could go
unnoticed as well ;-)

> IOW, if the application doesn't want an API to fail for reasons
> specific to the application, the onus of avoiding the error is on the
> application, no?

Yes, but maybe `image-dired--get-create-thumbnail-file' is not really an
established API.  It is called twice in Emacs (and the other place it is
called non images are already filtered out).

Do you think it could have been used in third-party package?
-- 
Manuel Giraud

Message #20 received at 61639 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: 61639 <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50; [PATCH] Do not error out on non image file
 in image-dired
Date: Mon, 20 Feb 2023 16:45:04 +0200

> From: Manuel Giraud <manuel <at> ledu-giraud.fr>
> Cc: 61639 <at> debbugs.gnu.org
> Date: Mon, 20 Feb 2023 15:13:37 +0100
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > So maybe "C-t d" should filter the selected "images" before it calls
> > the function which errors out?
> 
> That is what `image-dired-show-all-from-dir' is doing: it selects files
> from the given directory with the correct "image files" regexp and so no
> non image will be present.
> 
> So your idea is to keep `image-dired--get-create-thumbnail-file' as is
> and filter its input in `image-dired-display-thumbs'?  But then we won't
> get any message or error that something was not an image (this could go
> unnoticed as well ;-)

I don't necessarily see a reason to alert the user in this case, but
if you think we had better done that, we could show a message when we
find a non-image file in the list of the selected ones.

> > IOW, if the application doesn't want an API to fail for reasons
> > specific to the application, the onus of avoiding the error is on the
> > application, no?
> 
> Yes, but maybe `image-dired--get-create-thumbnail-file' is not really an
> established API.  It is called twice in Emacs (and the other place it is
> called non images are already filtered out).
> 
> Do you think it could have been used in third-party package?

That's not what bothers me.  What bothers me is that we burden a
low-level API with considerations whose source is the application.

Message #23 received at 61639 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 61639 <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50; [PATCH] Do not error out on non image file
 in image-dired
Date: Mon, 20 Feb 2023 17:41:35 +0100

[Message part 1 (text/plain, inline)]

Eli Zaretskii <eliz <at> gnu.org> writes:

[...]

>> So your idea is to keep `image-dired--get-create-thumbnail-file' as is
>> and filter its input in `image-dired-display-thumbs'?  But then we won't
>> get any message or error that something was not an image (this could go
>> unnoticed as well ;-)
>
> I don't necessarily see a reason to alert the user in this case, but
> if you think we had better done that, we could show a message when we
> find a non-image file in the list of the selected ones.

Ok.  Here is a new version of the patch that address those issues.  I
choose to not alert the user.

[0001-Do-not-error-out-on-non-image-file-bug-61639.patch (text/x-patch, attachment)]

[Message part 3 (text/plain, inline)]

-- 
Manuel Giraud

Message #26 received at 61639 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: 61639 <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50; [PATCH] Do not error out on non image file
 in image-dired
Date: Tue, 21 Feb 2023 14:01:34 +0200

> From: Manuel Giraud <manuel <at> ledu-giraud.fr>
> Cc: 61639 <at> debbugs.gnu.org
> Date: Mon, 20 Feb 2023 17:41:35 +0100
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > I don't necessarily see a reason to alert the user in this case, but
> > if you think we had better done that, we could show a message when we
> > find a non-image file in the list of the selected ones.
> 
> Ok.  Here is a new version of the patch that address those issues.  I
> choose to not alert the user.

Thanks.  This LGTM, but what is 'plusp'?

> diff --git a/lisp/image/image-dired.el b/lisp/image/image-dired.el
> index cfcd1851188..5798af77f35 100644
> --- a/lisp/image/image-dired.el
> +++ b/lisp/image/image-dired.el
> @@ -586,13 +586,15 @@ image-dired-display-thumbs
>                (erase-buffer))
>            (goto-char (point-max)))
>          (dolist (file files)
> -          (let ((thumb (image-dired--get-create-thumbnail-file file)))
> +          (when (string-match-p (image-dired--file-name-regexp) file)
>              (image-dired-insert-thumbnail
> -             thumb file dired-buf
> +             (image-dired--get-create-thumbnail-file file) 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))))

Message #29 received at 61639 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 61639 <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50; [PATCH] Do not error out on non image file
 in image-dired
Date: Tue, 21 Feb 2023 13:16:04 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

[...]

> Thanks.  This LGTM, but what is 'plusp'?

'plusp' is a classic Common Lisp predicate (that also seems to be
defined in Emacs).  It is equivalent to (> x 0)… maybe you prefer that.
Should I fix my patch?
-- 
Manuel Giraud

Message #32 received at 61639 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: 61639 <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50; [PATCH] Do not error out on non image file
 in image-dired
Date: Tue, 21 Feb 2023 15:03:44 +0200

> From: Manuel Giraud <manuel <at> ledu-giraud.fr>
> Cc: 61639 <at> debbugs.gnu.org
> Date: Tue, 21 Feb 2023 13:16:04 +0100
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> [...]
> 
> > Thanks.  This LGTM, but what is 'plusp'?
> 
> 'plusp' is a classic Common Lisp predicate (that also seems to be
> defined in Emacs).  It is equivalent to (> x 0)… maybe you prefer that.
> Should I fix my patch?

Where is it defined?  It isn't defined in "emacs -Q", and not after
loading image-dired.  (Tested in Emacs 29.)

Message #35 received at 61639 <at> debbugs.gnu.org (full text, mbox):

From: Manuel Giraud <manuel <at> ledu-giraud.fr>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 61639 <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50; [PATCH] Do not error out on non image file
 in image-dired
Date: Tue, 21 Feb 2023 15:23:01 +0100

[Message part 1 (text/plain, inline)]

Eli Zaretskii <eliz <at> gnu.org> writes:

[...]

>> 'plusp' is a classic Common Lisp predicate (that also seems to be
>> defined in Emacs).  It is equivalent to (> x 0)… maybe you prefer that.
>> Should I fix my patch?
>
> Where is it defined?  It isn't defined in "emacs -Q", and not after
> loading image-dired.  (Tested in Emacs 29.)

C-h f gives me this:
--8<---------------cut here---------------start------------->8---
plusp is an alias for ‘cl-plusp’ in ‘cl.el’.

This function is obsolete since 27.1; use ‘cl-plusp’ instead.
--8<---------------cut here---------------end--------------->8---

… anyway here is an updated version of the patch to avoid this.

[0001-Do-not-error-out-on-non-image-file-bug-61639.patch (text/x-patch, attachment)]

[Message part 3 (text/plain, inline)]

-- 
Manuel Giraud

Message #40 received at 61639-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Manuel Giraud <manuel <at> ledu-giraud.fr>
Cc: 61639-done <at> debbugs.gnu.org
Subject: Re: bug#61639: 30.0.50; [PATCH] Do not error out on non image file
 in image-dired
Date: Wed, 22 Feb 2023 15:22:11 +0200

> From: Manuel Giraud <manuel <at> ledu-giraud.fr>
> Cc: 61639 <at> debbugs.gnu.org
> Date: Tue, 21 Feb 2023 15:23:01 +0100
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> [...]
> 
> >> 'plusp' is a classic Common Lisp predicate (that also seems to be
> >> defined in Emacs).  It is equivalent to (> x 0)… maybe you prefer that.
> >> Should I fix my patch?
> >
> > Where is it defined?  It isn't defined in "emacs -Q", and not after
> > loading image-dired.  (Tested in Emacs 29.)
> 
> C-h f gives me this:
> --8<---------------cut here---------------start------------->8---
> plusp is an alias for ‘cl-plusp’ in ‘cl.el’.
> 
> This function is obsolete since 27.1; use ‘cl-plusp’ instead.
> --8<---------------cut here---------------end--------------->8---
> 
> … anyway here is an updated version of the patch to avoid this.

Thanks, I installed this on the emacs-29 branch, and closing the bug.

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