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bug#52569: 29.0.50; Wishlist: There should be a way for packages to hand
From: |
Lars Ingebrigtsen |
Subject: |
bug#52569: 29.0.50; Wishlist: There should be a way for packages to handle files without reading them in first |
Date: |
Mon, 20 Dec 2021 10:53:54 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
Juri Linkov <juri@linkov.net> writes:
>> This would be useful for large files like .sqlite and images.
>
> I'm not sure about images since some image formats are editable,
> like .svg, .xpm, .ps...
I think we'd want to keep the traditinal auto-mode-alist for the
editable image formats.
> Only .pdf with in doc-view-mode could have this optimization of not
> loading the whole file. Also archive files could benefit from this
> optimization.
arc-mode interprets zip files etc by itself, so I think that would be a
bigger challenge.
>> This function would be called with the file name and would be
>> responsible for returning a buffer that "displays" the file in some
>> sense.
>
> Or when it returns t, this could mean that the function displayed
> the buffer in some other way, for example, by calling an external command.
>
> Then find-file-alist could be used to implement a smarter
> dired-guess-shell-alist like for https://debbugs.gnu.org/18132#92
> So not only files visited by dired will be redirected
> to an external command, but also files visited by C-x C-f.
Hm... interesting idea... I think I'll have to ponder that more,
because that'd be a real user interface change, while the thing I was
thinking of here wouldn't be very apparent to the user at all -- it'd
just make things faster.
>> There's some details that aren't clear. Should this new buffer be
>> visiting the file? That sounds dangerous, because saving the buffer
>> contents to the file would destroy the file. But that could be handled
>> by... write-file-functions?
>
> Also functions that ask about saving a modified file buffer should
> probably skip such buffers.
Yes, probably.
> non-persistent-file-mode, or transient-file-mode, or ephemeral-mode...
Hm... if `view-mode' wasn't taken already, perhaps that would have been
an option.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no