python-mode from plain txt-files?

python-mode from plain txt-files?

[Andreas Röhler]

Hi,

from emacs -Q, when opening file with ending ".txt" which contains

#! /usr/bin/env python3

python-mode is started. Is this correct? Understand the mode is ruled
by a files ending, not just by some contents.

How to open such a file in fundamental-mode?
In the precise case python-mode hangs due to a very long line.

Thanks,
Andreas
GNU Emacs 28.0.50 (build 1, i686-pc-linux-gnu, GTK+ Version 3.14.5, 
cairo version 1.14.0) of 2020-04-06

Re: python-mode from plain txt-files?

[Eli Zaretskii]

> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
> Date: Wed, 6 May 2020 21:13:47 +0200
> 
> from emacs -Q, when opening file with ending ".txt" which contains
> 
> #! /usr/bin/env python3
> 
> python-mode is started. Is this correct? Understand the mode is ruled
> by a files ending, not just by some contents.

That's a simplification.  The full story is described in the ELisp
manual, under set-auto-mode (node "Auto Major Mode").

> How to open such a file in fundamental-mode?

"M-x fundamental-mode RET"?

Or temporarily disable interpreter-mode-alist.

Re: python-mode from plain txt-files?

[Andreas Röhler]

On 06.05.20 21:20, Eli Zaretskii wrote:
>> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
>> Date: Wed, 6 May 2020 21:13:47 +0200
>>
>> from emacs -Q, when opening file with ending ".txt" which contains
>>
>> #! /usr/bin/env python3
>>
>> python-mode is started. Is this correct? Understand the mode is ruled
>> by a files ending, not just by some contents.
> That's a simplification.  The full story is described in the ELisp
> manual, under set-auto-mode (node "Auto Major Mode").
>
>> How to open such a file in fundamental-mode?
> "M-x fundamental-mode RET"?
Than Emacs hangs already, it's not accessible any more.
>
> Or temporarily disable interpreter-mode-alist

When evaluating in scratch-buffer

(setq auto-mode-alist nil)

python-mode still appears.

Isn't it a bug? IMO files with ending ".txt" shouldn't be set in any 
programming language mode.

Re: python-mode from plain txt-files?

[Andreas Röhler]

> Or temporarily disable interpreter-mode-alist.
>
Okay, thanks, that works.

Re: python-mode from plain txt-files?

[Eli Zaretskii]

> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
> Date: Wed, 6 May 2020 21:50:12 +0200
> 
> > Or temporarily disable interpreter-mode-alist
> 
> When evaluating in scratch-buffer
> 
> (setq auto-mode-alist nil)
> 
> python-mode still appears.
> 
> Isn't it a bug?

No.