Level of headings not recognised

[Christopher Dimech <dimech@gmx.com>]

> Sent: Sunday, August 11, 2024 at 8:30 AM
> From: "Heime" <heimeborgia@protonmail.com>
> To: "Heime" <heimeborgia@protonmail.com>
> Cc: "Heime via Users list for the GNU Emacs text editor" <help-gnu-emacs@gnu.org>
> Subject: Re: Level of headings not recognised
>
> On Sunday, August 11th, 2024 at 5:49 AM, Heime <heimeborgia@protonmail.com> wrote:
>
> > On Sunday, August 11th, 2024 at 3:07 AM, Heime heimeborgia@protonmail.com wrote:
> >
> > > What is wrong in setting heading levels this way ?
> > >
> > > When I apply the following code, Level H1 is considered at same hierarchy as
> > > other levels. This means that if I do "Hide Sublevels" headings at levels 2,
> > > 3 etc still get displayed.
> > >
> > > (defvar mast-elisp-levels
> > > '( (";;; H1" . 1) (";;; H2" . 2) (";;; H3" . 3) (";;; H4" . 4)
> > > (";;; H5" . 5) (";;; H6" . 6) (";;; H7" . 7) (";;; H8" . 8) ))
> > >
> > > (defun mast-regexp ()
> > >
> > > (let ( (hrklevels nil) )
> > >
> > > (cond
> > > ((memq major-mode '(emacs-lisp-mode lisp-interaction-mode))
> > > (setq hrklevels mast-elisp-levels)))
> > >
> > > (when hrklevels
> > > (setq outline-regexp
> > > (concat (regexp-opt (mapcar 'car hrklevels)) "\\>"))
> > >
> > > (setq outline-heading-alist hrklevels)) ))
> > >
> > > (defun mast-regexp-hooks (actm)
> > >
> > > (let ( (kmdalit '(emacs-lisp-mode-hook
> > > lisp-interaction-mode-hook) )
> > >
> > > (hook-fn (cond
> > > ((eq actm 'add) #'add-hook)
> > > ((eq actm 'remove) #'remove-hook)
> > > (t (error "ACTM %s is invalid" actm)))) )
> > >
> > > (dolist (mdhk kmdalit)
> > > (funcall hook-fn mdhk #'mast-regexp)) ))
> >
> >
> > Should one use setq, setq-local, steq-default. Cannot get headings to
> > work from level 2 to 8
>
> I am getting into extreme difficulty in setting outline-regexp.  How should it be set ?

Apply

 (setq-local outline-level 'outline-level)

The setting ensures that the outline-minor-mode correctly recognizes and interprets
the hierarchical levels of headings when using custom regex patterns.

The variable outline-level determines the depth of each heading in the outline.
By default, this is set to a function that calculates the level based on the number
of leading asterisks (*) in a heading.

When you define custom heading levels using outline-regexp and outline-heading-alist,
the mode needs to know how to calculate the outline levels correctly.

setq-local sets the value of outline-level locally for the current buffer. This is
important because you want the custom level recognition to apply only in specific
modes (like emacs-lisp-mode) and not globally across all buffers.

By setting outline-level locally, you ensure that outline-minor-mode uses the correct
function to calculate the levels based on your custom setup.  If you don't set
outline-level locally, outline-minor-mode might fall back on its default behavior,
which expects levels to be calculated based on asterisks or other default indicators.