el/dot-emacs.el (experimental): Show fringe icon on current line.

[profile] / el / dot-emacs.el

diff --git a/el/dot-emacs.el b/el/dot-emacs.el
index 3440c82..f917905 100644 (file)
--- a/el/dot-emacs.el
+++ b/el/dot-emacs.el
@@ -872,6 +872,58 @@ doesn't match any of the regular expressions in
 (add-hook 'delete-frame-functions 'mdw-last-one-out-turn-off-the-lights)
 
 ;;;--------------------------------------------------------------------------
+;;; Where is point?
+
+(defvar mdw-point-overlay
+  (let ((ov (make-overlay 0 0))
+       (s "."))
+    (overlay-put ov 'priority 2)
+    (put-text-property 0 1 'display '(left-fringe vertical-bar) s)
+    (overlay-put ov 'before-string s)
+    (delete-overlay ov)
+    ov)
+  "An overlay used for showing where point is in the selected window.")
+
+(defun mdw-remove-point-overlay ()
+  "Remove the current-point overlay."
+  (delete-overlay mdw-point-overlay))
+
+(defun mdw-update-point-overlay ()
+  "Mark the current point position with an overlay."
+  (if (not mdw-point-overlay-mode)
+      (mdw-remove-point-overlay)
+    (overlay-put mdw-point-overlay 'window (selected-window))
+    (move-overlay mdw-point-overlay (point) (1+ (point)) (current-buffer))))
+
+(defvar mdw-point-overlay-buffers nil
+  "List of buffers using `mdw-point-overlay-mode'.")
+
+(define-minor-mode mdw-point-overlay-mode
+  "Indicate current line with an overlay."
+  :global nil
+  (let ((buffer (current-buffer)))
+    (setq mdw-point-overlay-buffers
+         (mapcan (lambda (buf)
+                   (if (and (buffer-live-p buf)
+                            (not (eq buf buffer)))
+                       (list buf)))
+                 mdw-point-overlay-buffers))
+    (if mdw-point-overlay-mode
+       (setq mdw-point-overlay-buffers
+             (cons buffer mdw-point-overlay-buffers))))
+  (cond (mdw-point-overlay-buffers
+        (add-hook 'pre-command-hook 'mdw-remove-point-overlay)
+        (add-hook 'post-command-hook 'mdw-update-point-overlay))
+       (t
+        (mdw-remove-point-overlay)
+        (remove-hook 'pre-command-hook 'mdw-remove-point-overlay)
+        (remove-hook 'post-command-hook 'mdw-update-point-overlay))))
+
+(define-globalized-minor-mode mdw-global-point-overlay-mode
+  mdw-point-overlay-mode
+  (lambda () (if (not (minibufferp)) (mdw-point-overlay-mode t))))
+
+;;;--------------------------------------------------------------------------
 ;;; General fontification.
 
 (defmacro mdw-define-face (name &rest body)