Re: Removing line and column number settings from some buffers

[Jean Louis]

* daniela-spit@gmx.it <daniela-spit@gmx.it> [2020-12-04 05:10]:
> What I want to do is to change the Mode Line, but then revert back to how it
> was in that buffer, by continue pressing same keybinding.  Can I store the
> old setup and then put it back again.

As each setting is variable one can store it in other variable or into
file, and get it back later.

(defun string-to-file-force (string file)
  "Prints string into file, matters not if file exists. Returns FILE as file 
name."
    (with-temp-file file
      (insert string))
    file)

(defun file-to-string (file)
  "File to string function"
  (with-temp-buffer
    (insert-file-contents file)
    (buffer-string)))

(defun data-to-file (data file)
  "PRIN1 Emacs Lisp DATA to FILE"
    (string-to-file-force (prin1-to-string data) file))

(defun data-from-file (file)
  "Reads and returns Emacs Lisp data from FILE"
  (car
   (read-from-string
    (file-to-string file))))

With those I am storing data into files and reading from files. It can
be just any complex Emacs Lisp data structure like hashes, it can be
lists, variables, just anything.

(setq my-hash (data-from-file "~/tmp/hash"))

(data-to-file mode-line-format "~/.emacs.d/modeline-saved.el")

saves `mode-line-format' into: "~/.emacs.d/modeline-saved.el" with
data looking like this:

("%e" mode-line-front-space mode-line-mule-info mode-line-client 
mode-line-modified mode-line-remote mode-line-frame-identification 
mode-line-buffer-identification "   " mode-line-position (vc-mode vc-mode) "  " 
mode-line-modes mode-line-misc-info mode-line-end-spaces)

and

(setq mode-line-format (data-from-file "~/.emacs.d/modeline-saved.el"))

loads the data from file back into `mode-line-format'

Jean