how does spacemacs folding work?

Question

I'm looking at the code responsible for spacemacs code folding when origami is enabled. All I see is hs-mode enabled and keys bound to origami's folding functions.

When I put this in my emacs (not spacemacs) config, the folding doesn't work like it does in spacemacs. The following is what I found from .emacs.d/layers/+spacemacs/spacemacs-editing/packages.el.

(use-package origami
    :defer t
    :init
    (progn 
    (origami-global-mode 1)
    (define-key evil-normal-state-map "za" 'origami-forward-toggle-node)
    (define-key evil-normal-state-map "zc" 'origami-close-node)
    (define-key evil-normal-state-map "zC" 'origami-close-node-recursively)
    ...)
    ...)

When adding this to my emacs config:

1) folding doesn't work when a sexp is on line 1

2) folding works with defun but not use-package or other functions

I want to find the specific parser spacemacs uses to define folds so that I can replicate it in my own emacs. But I don't understand how the folding is working.

For example, it's confusing to me that when I check the binding of za for example with describe-key, I see the key is bound to evil-toggle-fold rather than origami-toggle-fold which is what I would expect.

Answer 1

Since describe-key shows that za is bound to evil-toggle-fold, I guess the layer is actually not enabled, and the folding behavior is just plain hs-minor-mode. You can try turn on hs-minor-mode and toggle the sexp with C-c @ C-c.