emacs personal mark ring

my-mark-ring.el

; Emacs has two mark rings: a buffer-local one, and a global one. I always get confused with them; my mental model
; is that there ought to be just one mark ring. I want to implement that without trampling over the existing mark
; ring stuff. Here's a first draft at doing so: I just add a hook so that anytime the mark is set, we append to 
; my own personal mark ring, and then I have a function that is basically a copy-and-paste of pop-to-mark-command.

; This...seems to work? I am (1) stunned that it was so easy, and (2) suspcious that this ought to be unnecessary
; if I really understand the mark rings and used them correctly. 

; Thanks to https://mathstodon.xyz/@vernon@emacs.ch for pushing me to try this; see https://mathstodon.xyz/@vernon@emacs.ch/109913166908490838
; and my replies.

; sources, etc: 
; https://www.math.utah.edu/docs/info/elisp_29.html
; https://www.discovering-emacs.com/2134279/12309075
; 

(setq my-mark-ring ())

(defun my-activate-mark-hook ()
  (let ((new-mark (point-marker)))
    (setq my-mark-ring (cons new-mark my-mark-ring))
    ))

(setq activate-mark-hook #'my-activate-mark-hook)

(defun my-pop-to-mark-command ()
  "Jump to mark, and pop a new position for mark off the ring."
  (interactive)
  (let ((the-mark (car my-mark-ring)))
    (if (null the-mark)
        (user-error "No mark set in my mark ring.")
      (if (= (point) the-mark)g
          (message "Mark popped"))
      (switch-to-buffer (marker-buffer the-mark))
      (goto-char the-mark)
      (setq my-mark-ring (cdr my-mark-ring)))))