RE: [External] : Getting the operational value of a buffer variable

[Heime <heimeborgia@protonmail.com>]

------- Original Message -------
On Friday, December 2nd, 2022 at 2:52 AM, Drew Adams <drew.adams@oracle.com> wrote:


> > I want to get the operational value of a buffer
> > variable. If the buffer has a local value, one
> > cannot use the default-value implementation.
> > And if the local value in nil, I have to get the
> 
> ^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> > default-value.
> 
> 
> You said this in your previous mail, and I meant to
> correct it. It's not at all about the buffer-local
> value being `nil'.` nil' is a legitimate value.
> 
> It's about whether the variable has a buffer-local
> value. If it has a buffer-local value of `nil' then
> it has a buffer-local value.

Thank you for pointing things out.  I want to remove the mode-line
on all visible buffers, then toggle them back and forth.  

Currently, I have the following function, but this only works for the current buffer.

(defvar-local ramona-mode-line nil
  "Switch for mode-line display.")

(defun ramona-mode-line-toggle ()
  "Turns the mode-line display on or off."

  (interactive)

  (if ramona-mode-line

      (setq mode-line-format ramona-mode-line
            ramona-mode-line nil)

    (setq ramona-mode-line mode-line-format
          mode-line-format nil)

  (force-mode-line-update t))