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Code folding in Emacs.

From: Hongyi Zhao
Subject: Code folding in Emacs.
Date: Sun, 10 Oct 2021 16:16:21 +0800

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.


Assoc. Prof. Hongyi Zhao <>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province

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