Homepage: https://www.gnu.org/software/emacs
Visually highlight allout outline structure
This is an allout outline-mode add-on that highlights outline structure with graphical widgets. To activate, customize `allout-widgets-auto-activation'. You can also invoke allout-widgets-mode in a particular allout buffer. When auto-enabled, you can inhibit widget operation in particular allout buffers by setting the variable `allout-widgets-mode-inhibit' non-nil in that file's buffer. Use Emacs *file local variables* to generally inhibit for a file. See the `allout-widgets-mode' docstring for more details. Info about allout and allout-widgets development are available at https://myriadicity.net/software-and-systems/craft/emacs-allout The graphics include: - icons for item bullets, varying to distinguish whether the item either lacks any subitems, the subitems are currently collapsed within the item, or the item is currently expanded. - guide lines connecting item bullet-icons with those of their subitems. - cue area between the bullet-icon and the start of the body headline, for item numbering, encryption indicator, and distinctive bullets. The bullet-icon and guide line graphics provide keybindings and mouse bindings for easy outline navigation and exposure control, extending outline hot-spot navigation (see `allout-mode' docstring for details). Developers note: Our use of Emacs widgets is unconventional. We decorate existing text rather than substituting for it, to piggy-back on existing allout operation. This employs the C-coded efficiencies of widget-apply, widget-get, and widget-put, along with the basic object-oriented organization of widget-create, to systematically couple overlays, graphics, and other features with allout-governed text.