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;; This was hacked together by Jorgen Schäfer
;; And hacked again by Yann Hodique
;; Donated to the public domain. Use at your own risk.
(defgroup visible-mark nil
"Show the position of your mark."
:group 'convenience
:prefix "visible-mark-")
(defface visible-mark-face
`((((type tty) (class color))
(:background "blue" :foreground "white"))
(((type tty) (class mono))
(:inverse-video t))
(((class color) (background dark))
(:background "blue"))
(((class color) (background light))
(:background "lightblue"))
(t (:background "gray")))
"Face for the mark."
:group 'visible-mark)
(defvar visible-mark-overlay nil
"The overlay used in this buffer.")
(make-variable-buffer-local 'visible-mark-overlay)
(defun visible-mark-move-overlay ()
"Move the overlay in `visible-mark-overlay' to a new position."
(let ((m (mark)))
(when m (move-overlay visible-mark-overlay m (1+ m)))))
(require 'easy-mmode)
(defcustom global-visible-mark-mode-exclude-alist nil
"A list of buffer names to be excluded"
:group 'visible-mark
:type '(repeat regexp))
(defun visible-mark-mode-maybe ()
(when (cond
((minibufferp (current-buffer)) nil)
((flet ((fun (arg)
(if (null arg) nil
(or (string-match (car arg) (buffer-name))
(fun (cdr arg))))))
(fun global-visible-mark-mode-exclude-alist)) nil)
(t t))
(visible-mark-mode)))
(define-minor-mode visible-mark-mode
"A mode to make the mark visible."
nil nil nil
:group 'visible-mark
(if visible-mark-mode
(let ((m (or (mark) (set-mark (point-min)))))
(unless visible-mark-overlay
(setq visible-mark-overlay (make-overlay m (1+ m)))
(overlay-put visible-mark-overlay 'face 'visible-mark-face)
(add-hook 'post-command-hook 'visible-mark-move-overlay)))
(when visible-mark-overlay
(delete-overlay visible-mark-overlay)
(setq visible-mark-overlay nil))))
(easy-mmode-define-global-mode
global-visible-mark-mode visible-mark-mode visible-mark-mode-maybe :group 'visible-mark)
(provide 'visible-mark-mode)
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