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Showing content from https://github.com/jcfk/savefold.el below:

jcfk/savefold.el: persistence for various emacs folding systems

This package is a family of global minor modes that persist folds made by various existing (mostly) overlay-based folding systems, saving them to the disk and reapplying upon file open. Currently supported:

• outline-mode / outline-minor-mode
• org-mode (including org 9.6+ text prop folds)
• origami.el
• hideshow
• ts-fold / treesit-fold
• yafolding
• Manual folding in hide-ifdef-mode
• markdown-mode

Rationale: there are billions of different types of folds in emacs, and very few of the packages implement persistence. It makes sense for fold persistence to be abstracted out into a separate package, both for economic reasons and for consistency of usage.

(use-package savefold
  :init
  (setq savefold-backends '(outline org origami hideshow))
  (setq savefold-directory (locate-user-emacs-file "savefold"))  ;; default

  :config
  (savefold-mode 1))

Notes:

• Folding systems which are not a part of Emacs (eg. origami) have to be installed separately, if their savefold backend is to be used.
• For org: setting org-startup-folded to 'showeverything is recommended for proper support.

Configuration:

• savefold-backends (default: '(outline)) is a list of backends to be enabled by savefold-mode.
• savefold-directory (default: (locate-user-emacs-file "savefold")) is the directory where fold data is saved.

Please feel free to contribute support for other folding systems. Suggestions and comments are also very welcome.

Development guidelines:

• Savefold uses Eask for environment management and Buttercup for testing.
• Savefold supports Emacs versions 28, 29, and 30.
• If you’re adding new functionality, please also create the relevant tests.

Before sending a PR, ensure (within reason):

1. All tests pass: eask test buttercup
2. Compilation without warnings: eask compile
3. check-declare is clean: eask lint declare
4. package-lint is clean: eask lint package

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