Origami

(global-set-key
 (kbd "H-C-f")
 (defhydra hydra-folding (:color red)
   "
  _o_pen node    _n_ext fold       toggle _f_orward
  _c_lose node   _p_revious fold   toggle _a_ll
  "
   ("o" origami-open-node)
   ("c" origami-close-node)
   ("n" origami-next-fold)
   ("p" origami-previous-fold)
   ("f" origami-forward-toggle-node)
   ("a" origami-toggle-all-nodes)))