GNU bug report logs - #79033
<<< unnecessary harmful substitution (EOF)

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

From: Dmitri Seletski <drjoms <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Cc: help-gnu-emacs <at> gnu.org
Subject: Re: <<< unnecessary harmful substitution (EOF)
Date: Wed, 16 Jul 2025 12:18:24 +0100

Sorry, send to wrong email list.

Sending to correct one.

Regards

Dmitri

On 7/16/25 12:16 PM, Dmitri Seletski wrote:
> Hello,
>
> I understand that typing 3 times '<' symbol forces auto substitution.
>
> I believe its a bug, it does not help me with anything, but wastes my 
> time. it's VI level arcane magic no one needs.
>
> Simple bash command I try to type in  - 'somecommand <<< file.txt' 
> becomes a nightmare.
>
> I can't find in google how to disable it.(or duck duck go for that 
> reason)
>
> I find results in search sites, and they talk about hooks.
>
> I have exactly ZERO interest learning LISP PROGRAMMING LANGUAGE, it's 
> hooks to DO BASIC TEXT EDITING!
>
> This is frustrating beyond belief.
>
> Please disable this undesired harmful "feature" in future releases by 
> default. Anything who are aware of it and use it - feel free to learn 
> LISP, hooks, and other programming languages, just to enable it.
>
> Please kindly explain in user friendly terms HOW TO DISABLE this 
> harmful 'feature'.(hopefully this will be cached into search engine 
> results, so other don't bang their heads against the wall)
>
> Please talk to users before implementing any auto substitution of input.
>
> Thank you in advance.
>
> Dmitri Seletski
>

Message #8 received at 79033 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Dmitri Seletski <drjoms <at> gmail.com>
Cc: 79033 <at> debbugs.gnu.org
Subject: Re: bug#79033: <<< unnecessary harmful substitution (EOF)
Date: Thu, 17 Jul 2025 00:22:28 -0400

[ Please don't cross post to the bug address and to a mailing-list
  (e.g. help-gnu-emacs <at> gnu.org).  ]

> I understand that typing 3 times '<' symbol forces auto substitution.

Actually not 3, only 2 (followed by space or dash, IIRC).

> I believe its a bug, it does not help me with anything, but wastes my
> time. it's VI level arcane magic no one needs.

As you have found out by now, there's a configuration variable that lets
you disable this "arcane magic".  But...

> Simple bash command I try to type in  - `somecommand <<< file.txt` becomes
> a nightmare.

The magic thingy does not trigger when I type the above command.
I vaguely remember we refined the magic which was triggered a bit too
eagerly some versions back, but even in Emacs-28.2 the above example you
provide does not trigger the magic to which you object, so I wonder if
you're using an even older version of Emacs or if you actually typed
something else.


        Stefan

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