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Re: Code folding in Emacs.

From: Thibaut Verron
Subject: Re: Code folding in Emacs.
Date: Thu, 14 Oct 2021 10:21:59 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 14/10/2021 07:47, David Masterson wrote:
Hongyi Zhao <> writes:

I just found the following code snippet from here [1] for code folding in Emacs:

(global-set-key (kbd "<C-f5>") 'set-selective-display-dlw)

(defun set-selective-display-dlw (&optional level)
   "Fold text indented same of more than the cursor.
If level is set, set the indent level to LEVEL.
If 'selective-display' is already set to LEVEL, clicking
F5 again will unset 'selective-display' by setting it to 0."
   (interactive "P")
   (if (eq selective-display (1+ (current-column)))
       (set-selective-display 0)
     (set-selective-display (or level (1+ (current-column))))))

The above code trick seems very simple, but it works for many
languages. So I recommend it here.

See Origami.

Which is, sadly, now unmaintained. Most notably, it lacks documentation on how to specify a parser, all one can do is guess based on the existing ones. There are forks attempting to clear those gaps, but afaik it's not there yet -- and they face distribution issues, with package repositories refusing to keep several packages with the same name.

It would be great if Emacs had something like origami built-in, aka a folding framework with a more flexible way to specify folding points than regexps (hideshow) or headers (outline). Essentially something like smie, but for folding: define functions to test if we are at an opener, at a closer, to find the closer for an opener, to find the subnodes if applicable, and let the package merge it all, construct the folding tree and take care of the folding.

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