GNU bug report logs - #78579
30.0.92; Global variant of delete-trailing-whitespace-mode

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Message #14 received at 78579 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: jforst.mailman <at> gmail.com, 78579 <at> debbugs.gnu.org
Subject: Re: bug#78579: 30.0.92;
 Global variant of delete-trailing-whitespace-mode
Date: Sat, 24 May 2025 18:50:16 +0300

> Cc: 78579 <at> debbugs.gnu.org
> Date: Sat, 24 May 2025 11:14:24 -0400
> From:  Stefan Monnier via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> > `delete-trailing-whitespace-mode` was introduced in commit 8a19c249f81.
> > Should there also be a `global-delete-trailing-whitespace-mode`?
> > This would allow
> >   (global-delete-trailing-whitespace-mode 1)
> > and turning it off in an individual buffer with
> >   (delete-trailing-whitespace-mode -1)
> 
> To define such a mode, we'll need to know when to enable it and when
> not: I'd be surprised if adding `delete-trailing-whitespace` globally
> to `before-save-hook` doesn't cause problems in various circumstances.
> 
> I don't have enough experience with that, so I'll let others decide if
> and how to do it.

I share the fears expressed by Stefan.  I think that such a global
mode would be more dangerous than it's useful.  After all, it's easy
to add the activation of the local minor mode to mode-hook of any
modes one wants.

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