bug#74364: Bug?

[Manuel Giraud]

Eli Zaretskii <eliz@gnu.org> writes:

>> Cc: 74364@debbugs.gnu.org
>> Date: Mon, 25 Nov 2024 20:10:49 +0100
>> From:  Manuel Giraud via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>> 
>> Tatsu Takamaro <tatsu.takamaro@gmail.com> writes:
>> 
>> [...]
>> 
>> Ok, now your recipe is more precise and I can reproduce it.
>> 
>> > 3. Put some changes into the Tutorial. Say, just add a new line.
>> >
>> > 4. Press C-x-s to save. Emacs asks me to write a filename, I write
>> > TUTORIAL, because the full path is alredy shown. Then Emacs asks me
>> > whether I want to overwrite the file. I anser Yes (type y).
>> 
>> After this 'C-x C-s', you have saved the content of the (modified)
>> TUTORIAL into a file named "TUTORIAL" somewhere on your hard drive.
>> Now, in this buffer, `tutorial--lang' is set to nil (which cause the
>> error you saw) and Emacs still wants to save your progression in the
>> tutorial and that's why it asks the question when you tried to quit.
>> 
>> This is indeed a bug but maybe saving the TUTORIAL buffer is not
>> supported.  Or we should remap `save-buffer' to save tutorial
>> progression here?
>
> Saving TUTORIAL is a strange thing to do.  What is the purpose?  The
> file produced that way cannot be used as a tutorial, AFAIU, because
> Emacs doesn't let users specify the tutorial's file name.

It seems that at some point of the tutorial, the user is expected to do
it.

[...]

> So my suggestion would be to modify tutorial--save-tutorial and
> tutorial--save-on-kill such that of tutorial--lang is nil, they will
> do nothing.  Because there's no point of trying to save the tutorial
> in that case.

I could try to come up with a patch like this.
-- 
Manuel Giraud