GNU bug report logs - #45127
28.0.50; wdired + dired-hide-details-mode toggling?

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Package: emacs; Severity: wishlist; Reported by: Michael Heerdegen <michael_heerdegen@HIDDEN>; dated Tue, 8 Dec 2020 21:35:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Michael Heerdegen <michael_heerdegen@HIDDEN>
To: Drew Adams <drew.adams@HIDDEN>
Subject: Re: bug#45127: 28.0.50; wdired + dired-hide-details-mode toggling?
References: <87blf4f0dj.fsf@HIDDEN>
 <80c93582-b986-42ec-b944-a47f6e4e143c@default> <877dpsexvz.fsf@HIDDEN>
 <87360fgbki.fsf@HIDDEN> <a643ac3d-985e-4076-9592-aa2edbae1fbc@default>
Date: Wed, 09 Dec 2020 00:49:21 +0100
In-Reply-To: <a643ac3d-985e-4076-9592-aa2edbae1fbc@default> (Drew Adams's
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Drew Adams <drew.adams@HIDDEN> writes:

> All I tried was `emacs -Q', then Dired, then `C-x C-q',
> then evaluate (derived-mode-p 'dired-mode), which
> returned nil.

But you also said "FWIW, I don't see this problem with Emacs 27.1",
i.e. you said you don't see the error this is about.

> I used Emacs 26.3 and 27.1.  Maybe the test you show
> was introduced after 27.1?  Where do you see that test?

It's the first expression in the body of `dired-hide-details-mode' and
has been there since `dired-hide-details-mode' had been added 8 years
ago AFAICT.

Regards,

Michael.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#45127; Package emacs. Full text available.

Message received at 45127 <at> debbugs.gnu.org:


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Date: Tue, 8 Dec 2020 14:57:44 -0800 (PST)
From: Drew Adams <drew.adams@HIDDEN>
To: Michael Heerdegen <michael_heerdegen@HIDDEN>
Subject: RE: bug#45127: 28.0.50; wdired + dired-hide-details-mode toggling?
References: <87blf4f0dj.fsf@HIDDEN>
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> And it also seems that wdired-mode never was derived from dired-mode.
> So I wonder why it works for you.  Or maybe you just misunderstood what
> I tried to suggest?

All I tried was `emacs -Q', then Dired, then `C-x C-q',
then evaluate (derived-mode-p 'dired-mode), which
returned nil.

I used Emacs 26.3 and 27.1.  Maybe the test you show
was introduced after 27.1?  Where do you see that test?

(FWIW, I can't imagine why `wdired-mode' would ever be
derived from `dired-mode'.)




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#45127; Package emacs. Full text available.

Message received at 45127 <at> debbugs.gnu.org:


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From: Michael Heerdegen <michael_heerdegen@HIDDEN>
To: Drew Adams <drew.adams@HIDDEN>
Subject: Re: bug#45127: 28.0.50; wdired + dired-hide-details-mode toggling?
References: <87blf4f0dj.fsf@HIDDEN>
 <80c93582-b986-42ec-b944-a47f6e4e143c@default> <877dpsexvz.fsf@HIDDEN>
Date: Tue, 08 Dec 2020 23:47:09 +0100
In-Reply-To: <877dpsexvz.fsf@HIDDEN> (Michael Heerdegen's message of "Tue, 08
 Dec 2020 23:28:00 +0100")
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Michael Heerdegen <michael_heerdegen@HIDDEN> writes:

> #+begin_src emacs-lisp
> (unless (derived-mode-p 'dired-mode)
>     (error "Not a Dired buffer"))
> #+end_src

And it also seems that wdired-mode never was derived from dired-mode.
So I wonder why it works for you.  Or maybe you just misunderstood what
I tried to suggest?


Thanks,

Michael.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#45127; Package emacs. Full text available.

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From: Drew Adams <drew.adams@HIDDEN>
To: Michael Heerdegen <michael_heerdegen@HIDDEN>
Subject: RE: bug#45127: 28.0.50; wdired + dired-hide-details-mode toggling?
References: <87blf4f0dj.fsf@HIDDEN>
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> Does your wdired buffer fulfill (derived-mode-p 'dired-mode)?

No.  That sexp returns nil.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#45127; Package emacs. Full text available.

Message received at 45127 <at> debbugs.gnu.org:


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To: Drew Adams <drew.adams@HIDDEN>
Subject: Re: bug#45127: 28.0.50; wdired + dired-hide-details-mode toggling?
References: <87blf4f0dj.fsf@HIDDEN>
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Drew Adams <drew.adams@HIDDEN> writes:

> FWIW, I don't see this problem with Emacs 27.1
> or earlier on MS Windows.

d-h-details-mode has this test since it had been added:

#+begin_src emacs-lisp
(unless (derived-mode-p 'dired-mode)
    (error "Not a Dired buffer"))
#+end_src

Does your wdired buffer fulfill (derived-mode-p 'dired-mode)?


Thanks,

Michael.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#45127; Package emacs. Full text available.

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FWIW, I don't see this problem with Emacs 27.1
or earlier on MS Windows.

Perhaps it's a regression for Emacs > 27?
Or perhaps it's platform-dependent?  (Windows
uses `ls-lisp'; dunno whether that makes any
difference, but I don't expect it would.)




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#45127; Package emacs. Full text available.

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Hello,

My wishlist proposal is: may we allow to toggle
`dired-hide-details-mode' in a wdired buffer (currently an error is
signaled in this case)?  I ask because (1) seems this would work out of
the box, and (2) it may be useful, e.g. because I started with hidden
details, already have performed some changes, and see that I need to
change something in the details also.  Or I have long filenames and thus
want to hide details although I have already switched to wdired.

Anyway, the implementation of d-h-details-mode only seems to toggle some
invisibility spec, and thus I expect no problems (will try it out
privately in the meantime).

I guess we would need a new key for it, since the binding for toggling,
"(", is bound to self-insert-command in a wdired buffer.  C-c ( maybe?

TIA,

Michael.


In GNU Emacs 28.0.50 (build 20, x86_64-pc-linux-gnu, GTK+ Version 3.24.23, cairo version 1.16.0)
 of 2020-12-08 built on drachen
Repository revision: 9965fc635f54cabc9da7a234356eeed4c1fc7257
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12010000
System Description: Debian GNU/Linux bullseye/sid




Acknowledgement sent to Michael Heerdegen <michael_heerdegen@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#45127; Package emacs. Full text available.
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