GNU bug report logs - #79848
[idea] Persistent folding for hideshow (and others)

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

From: Elijah Gabe Pérez <eg642616 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: [idea] Persistent folding for hideshow (and others)
Date: Sun, 16 Nov 2025 12:41:14 -0600

A few days ago, someone sent me an FR to implement persistent folding
for hideshow.

While I am willing to help and implement this as much as I can, I think
we need to discuss this idea first.  I believe that this should not be
exclusive to hideshow, but should be used for other folding packages as
well.

I've had a few ideas about this:

1. Merge an existing package.
   There is a package called savefold.el that implements this idea.
   According to the repository, it only has two contributors (and one of
   them already has the copyright assigned AFAIK).  So I could ask the
   author if he agrees to merge his package into the core (with a few
   changes).

2. Implement it from scratch (if it is not possible to merge savefold.el).

3. Implement it only for hideshow.


What do you all think about this?

-- 
- E.G via Gnus and Org.

Message #8 received at 79848 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Elijah Gabe Pérez <eg642616 <at> gmail.com>
Cc: 79848 <at> debbugs.gnu.org
Subject: Re: bug#79848: [idea] Persistent folding for hideshow (and others)
Date: Sun, 16 Nov 2025 21:02:33 +0200

> A few days ago, someone sent me an FR to implement persistent folding
> for hideshow.
>
> While I am willing to help and implement this as much as I can, I think
> we need to discuss this idea first.  I believe that this should not be
> exclusive to hideshow, but should be used for other folding packages as
> well.
>
> I've had a few ideas about this:
>
> 1. Merge an existing package.
>    There is a package called savefold.el that implements this idea.
>    According to the repository, it only has two contributors (and one of
>    them already has the copyright assigned AFAIK).  So I could ask the
>    author if he agrees to merge his package into the core (with a few
>    changes).
>
> 2. Implement it from scratch (if it is not possible to merge savefold.el).
>
> 3. Implement it only for hideshow.
>
> What do you all think about this?

outline-minor-mode already implements persistent folding using
outline-revert-buffer-restore-visibility that is currently used
to restore previous folding after reverting the buffer.

Message #11 received at 79848 <at> debbugs.gnu.org (full text, mbox):

From: Elijah Gabe Pérez <eg642616 <at> gmail.com>
To: Juri Linkov <juri <at> linkov.net>
Cc: 79848 <at> debbugs.gnu.org
Subject: Re: bug#79848: [idea] Persistent folding for hideshow (and others)
Date: Sun, 16 Nov 2025 21:47:44 -0600

Juri Linkov <juri <at> linkov.net> writes:

[...]

>> What do you all think about this?
>
> outline-minor-mode already implements persistent folding using
> outline-revert-buffer-restore-visibility that is currently used
> to restore previous folding after reverting the buffer.

I meant to save the state of hidden blocks ala saveplace.el, if I hide a
block in a file, close the file buffer, and reopen that file, it should
preserve the hidden blocks.

--
- E.G via Gnus and Org.

Message #14 received at 79848 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Elijah Gabe Pérez <eg642616 <at> gmail.com>
Cc: 79848 <at> debbugs.gnu.org
Subject: Re: bug#79848: [idea] Persistent folding for hideshow (and others)
Date: Mon, 17 Nov 2025 09:12:48 +0200

>> outline-minor-mode already implements persistent folding using
>> outline-revert-buffer-restore-visibility that is currently used
>> to restore previous folding after reverting the buffer.
>
> I meant to save the state of hidden blocks ala saveplace.el, if I hide a
> block in a file, close the file buffer, and reopen that file, it should
> preserve the hidden blocks.

'outline--hidden-headings-paths' returns a data structure
that can be saved in a file.

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