bug#69404: Loss of latex-mode fontification when loading libraries in latex-mode-hook that require json-mode

bug#69404: Loss of latex-mode fontification when loading libraries in latex-mode-hook that require json-mode

[Gabriele Nicolardi]

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Hi,

my actual scenario involves using |latex-mode-hook| to load some 
libraries that require |json-mode|.

I replicated my issue in a MWE:

I have a |LaTeX| file:

|\documentclass{article} \usepackage{mwe} \begin{document} \blindtext 
\noindent \includegraphics[width=.4\textwidth]{example-image-a}\hfill 
\includegraphics[width=.4\textwidth]{example-image-b} \blindtext 
\end{document} |

If I load it like this:

|emacs -Q test.tex |

I get this “correct” |latex-mode| fontification:

enter image description here <https://i.stack.imgur.com/J2nvW.png>

I have also a config file (I simplified it to obtain the feature):

|(add-hook 'latex-mode-hook #'(lambda () (package-initialize) (require 
'json-mode))) |

If I load my |.tex| file like this:

|emacs -Q --eval "(load-file \"/tmp/config.el\")" test.tex |

I lose |latex-mode| fontification:

enter image description here <https://i.stack.imgur.com/pCKy8.png>

 1. In the last case, to restore correct |latex-mode| fontification I
    need to do |M-x latex-mode|
 2. This problem does not happen with other packages or custom libraries
    but, in my experience, it happens only for the |json-mode| package.
 3. If I load |json-mode| “before” |latex-mode| I have no problem. E.g.
    if I modify the |config.el| file this way:

|(package-initialize) (require 'json-mode) |

and I do:

|emacs -Q --eval "(load-file \"/tmp/config.el\")" test.tex |

I get the correct |latex-mode| fontification.

Am I doing something wrong or is it some kind of bug in |json-mode| or 
in |Emacs|?

*Important note.* This didn’t happen with previous versions of |Emacs|. 
Before upgrading to version 29.2, I was using version 27 and never 
encountered this issue prior to the upgrade.

(I opened an issue on StackExchange where you can find the formatted 
version, with figures, of this message: 
https://emacs.stackexchange.com/q/80447/15606)

Best regards,

Gabriele Nicolardi

​

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bug#69404: Loss of latex-mode fontification when loading libraries in latex-mode-hook that require json-mode

[Eli Zaretskii]

> Date: Mon, 26 Feb 2024 10:27:53 +0100
> From: Gabriele Nicolardi <gabriele@medialab.sissa.it>
> 
> I have a LaTeX file:
> 
> \documentclass{article}
> \usepackage{mwe}
> \begin{document}
> 
> \blindtext
> 
> \noindent
> \includegraphics[width=.4\textwidth]{example-image-a}\hfill
> \includegraphics[width=.4\textwidth]{example-image-b}
> 
> \blindtext
> 
> \end{document}
> 
> If I load it like this:
> 
> emacs -Q test.tex
> 
> I get this “correct” latex-mode fontification:
> 
> I have also a config file (I simplified it to obtain the feature):
> 
> (add-hook 'latex-mode-hook
>           #'(lambda ()
>           (package-initialize)
>           (require 'json-mode)))
> 
> If I load my .tex file like this:
> 
> emacs -Q --eval "(load-file \"/tmp/config.el\")" test.tex
> 
> I lose latex-mode fontification:

What is the value of major-mode after you load your .tex file as
above?

bug#69404: Loss of latex-mode fontification when loading libraries in latex-mode-hook that require json-mode

[Gabriele Nicolardi]

Il 26/02/24 14:03, Eli Zaretskii ha scritto:
>> Date: Mon, 26 Feb 2024 10:27:53 +0100
>> From: Gabriele Nicolardi <gabriele@medialab.sissa.it>
>>
>> I have a LaTeX file:
>>
>> \documentclass{article}
>> \usepackage{mwe}
>> \begin{document}
>>
>> \blindtext
>>
>> \noindent
>> \includegraphics[width=.4\textwidth]{example-image-a}\hfill
>> \includegraphics[width=.4\textwidth]{example-image-b}
>>
>> \blindtext
>>
>> \end{document}
>>
>> If I load it like this:
>>
>> emacs -Q test.tex
>>
>> I get this “correct” latex-mode fontification:
>>
>> I have also a config file (I simplified it to obtain the feature):
>>
>> (add-hook 'latex-mode-hook
>>            #'(lambda ()
>>            (package-initialize)
>>            (require 'json-mode)))
>>
>> If I load my .tex file like this:
>>
>> emacs -Q --eval "(load-file \"/tmp/config.el\")" test.tex
>>
>> I lose latex-mode fontification:
> What is the value of major-mode after you load your .tex file as
> above?

In the buffer loaded as above, with the wrong fontification, I have:

major-mode is a variable defined in ‘C source code’.


Its value is ‘latex-mode’
Original value was ‘fundamental-mode’
Local in buffer test.tex; global value is fundamental-mode

bug#69404: Loss of latex-mode fontification when loading libraries in latex-mode-hook that require json-mode

[Eli Zaretskii]

> Date: Mon, 26 Feb 2024 16:41:15 +0100
> Cc: 69404@debbugs.gnu.org
> From: Gabriele Nicolardi <gabriele@medialab.sissa.it>
> 
> 
> Il 26/02/24 14:03, Eli Zaretskii ha scritto:
> >> If I load my .tex file like this:
> >>
> >> emacs -Q --eval "(load-file \"/tmp/config.el\")" test.tex
> >>
> >> I lose latex-mode fontification:
> > What is the value of major-mode after you load your .tex file as
> > above?
> 
> In the buffer loaded as above, with the wrong fontification, I have:
> 
> major-mode is a variable defined in ‘C source code’.
> 
> 
> Its value is ‘latex-mode’
> Original value was ‘fundamental-mode’
> Local in buffer test.tex; global value is fundamental-mode

Then I suggest to look for the reason in json-mode.el.  For example,
this part:

  (add-to-list 'magic-fallback-mode-alist '("^[{[]$" . json-mode))

could change the global state when you load json-mode.

bug#69404: Loss of latex-mode fontification when loading libraries in latex-mode-hook that require json-mode

[Gabriele Nicolardi]

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Il 26/02/24 16:57, Eli Zaretskii ha scritto:
>> In the buffer loaded as above, with the wrong fontification, I have:
>>
>> major-mode is a variable defined in ‘C source code’.
>>
>>
>> Its value is ‘latex-mode’
>> Original value was ‘fundamental-mode’
>> Local in buffer test.tex; global value is fundamental-mode
> Then I suggest to look for the reason in json-mode.el.  For example,
> this part:
>
>    (add-to-list 'magic-fallback-mode-alist '("^[{[]$" . json-mode))
>
> could change the global state when you load json-mode.

I opened and issue on the json-mode GitHub project page.


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bug#69404: Loss of latex-mode fontification when loading libraries in latex-mode-hook that require json-mode

[Gabriele Nicolardi]

Indeed it was a bug in json-mode.el

https://github.com/json-emacs/json-mode/issues/79

Thanks!

Gabriele Nicolardi

Il 26/02/24 16:57, Eli Zaretskii ha scritto:
>> Date: Mon, 26 Feb 2024 16:41:15 +0100
>> Cc: 69404@debbugs.gnu.org
>> From: Gabriele Nicolardi <gabriele@medialab.sissa.it>
>>
>>
>> Il 26/02/24 14:03, Eli Zaretskii ha scritto:
>>>> If I load my .tex file like this:
>>>>
>>>> emacs -Q --eval "(load-file \"/tmp/config.el\")" test.tex
>>>>
>>>> I lose latex-mode fontification:
>>> What is the value of major-mode after you load your .tex file as
>>> above?
>> In the buffer loaded as above, with the wrong fontification, I have:
>>
>> major-mode is a variable defined in ‘C source code’.
>>
>>
>> Its value is ‘latex-mode’
>> Original value was ‘fundamental-mode’
>> Local in buffer test.tex; global value is fundamental-mode
> Then I suggest to look for the reason in json-mode.el.  For example,
> this part:
>
>    (add-to-list 'magic-fallback-mode-alist '("^[{[]$" . json-mode))
>
> could change the global state when you load json-mode.

bug#69404: Loss of latex-mode fontification when loading libraries in latex-mode-hook that require json-mode

[Eli Zaretskii]

> Date: Wed, 28 Feb 2024 14:29:40 +0100
> Cc: 69404@debbugs.gnu.org
> From: Gabriele Nicolardi <gabriele@medialab.sissa.it>
> 
> Indeed it was a bug in json-mode.el
> 
> https://github.com/json-emacs/json-mode/issues/79

Thanks for telling us, I'm therefore closing this bug.