initial checkin

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+;;; visible-mark.el --- Make marks visible.
+
+;;; Commentary:
+
+;; This was hacked together by Jorgen Schäfer
+;; And hacked again by Yann Hodique
+;; Donated to the public domain. Use at your own risk.
+
+;;; History:
+;; 2008-02-21  MATSUYAMA Tomohiro <t.matsuyama.pub@gmail.com>
+;;
+;;      * visible-mark.el: Added function to inhibit trailing overlay.
+;;
+;; 2008-01-31  MATSUYAMA Tomohiro <t.matsuyama.pub@gmail.com>
+;;
+;;      * visible-mark.el: Create formal emacs lisp file from
+;;        http://www.emacswiki.org/cgi-bin/wiki/VisibleMark.
+;;        Yann Hodique and Jorgen Schäfer are original authors.
+;;        Added function to make multiple marks visible.
+;;
+
+;;; Code:
+
+(eval-when-compile
+  (require 'cl))
+
+(defgroup visible-mark nil
+  "Show the position of your mark."
+  :group 'convenience
+  :prefix "visible-mark-")
+
+(defface visible-mark-face
+  `((((type tty) (class color))
+     (:background "gray" :foreground "white"))
+    (((type tty) (class mono))
+     (:inverse-video t))
+    (((class color) (background dark))
+     (:background "gray"))
+    (((class color) (background light))
+     (:background "grey80"))
+    (t (:background "gray")))
+  "Face for the mark."
+  :group 'visible-mark)
+
+(defvar visible-mark-overlays nil
+  "The overlays used in this buffer.")
+(make-variable-buffer-local 'visible-mark-overlays)
+
+(defvar visible-mark-non-trailing-faces nil)
+
+(defcustom visible-mark-inhibit-trailing-overlay t
+  "If non-nil, inhibit trailing overlay with underline face."
+  :group 'visible-mark
+  :type 'boolean)
+
+(defcustom visible-mark-max 1
+  "A number of mark to be visible."
+  :group 'visible-mark
+  :type 'integer)
+
+(defcustom visible-mark-faces nil
+  "A list of mark faces."
+  :group 'visible-mark
+  :type '(repeat face))
+
+(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-initialize-faces ()
+  (if (and visible-mark-inhibit-trailing-overlay
+           (null visible-mark-non-trailing-faces))
+      (let (faces)
+        (dotimes (i visible-mark-max)
+          (let ((face (or (nth i visible-mark-faces) 'visible-mark-face))
+                (symbol (intern (format "visible-mark-non-trailing-face%s" i))))
+            (copy-face face symbol)
+            (set-face-attribute symbol nil
+                                :foreground (or (face-attribute face :background) t)
+                                :background 'unspecified
+                                :underline t)
+            (push symbol faces)))
+        (setq visible-mark-non-trailing-faces (nreverse faces)))))
+                  
+(defun visible-mark-initialize-overlays ()
+  (mapcar 'delete-overlay visible-mark-overlays)
+  (let (overlays)
+    (dotimes (i visible-mark-max)
+      (let ((overlay (make-overlay (point-min) (point-min))))
+        (push overlay overlays)))
+    (setq visible-mark-overlays (nreverse overlays))))
+
+(defun visible-mark-move-overlays ()
+  "Move the overlay in `visible-mark-overlay' to a new position."
+  (let ((marks (cons (mark-marker) mark-ring))
+        (overlays visible-mark-overlays))
+    (dotimes (i visible-mark-max)
+      (let* ((mark (car-safe marks))
+             (overlay (car overlays))
+             (pos (and mark (marker-position mark))))
+        (when pos
+          (overlay-put overlay 'face
+                       (if (and visible-mark-inhibit-trailing-overlay
+                                (save-excursion
+                                  (goto-char pos)
+                                  (eolp)))
+                           (nth i visible-mark-non-trailing-faces)
+                         (or (nth i visible-mark-faces) 'visible-mark-face)))
+          (move-overlay overlay pos (1+ pos)))
+        (setq marks (cdr marks)))
+        (setq overlays (cdr overlays)))))
+
+(require 'easy-mmode)
+
+(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
+      (progn
+        (visible-mark-initialize-faces)
+        (visible-mark-initialize-overlays)
+        (add-hook 'post-command-hook 'visible-mark-move-overlays nil t))
+    (mapcar 'delete-overlay visible-mark-overlays)
+    (setq visible-mark-overlays nil)
+    (remove-hook 'post-command-hook 'visible-mark-move-overlays t)))
+
+(define-global-minor-mode
+  global-visible-mark-mode visible-mark-mode visible-mark-mode-maybe
+  :group 'visible-mark)
+
+(provide 'visible-mark)
+;;; visible-mark.el ends here