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+;;; @(#) bar-cursor.el -- package used to switch block cursor to a bar
+;;; @(#) $Id: bar-cursor.el,v 1.1 2003-04-04 20:15:55 lolando Exp $
+
+;; This file is not part of Emacs
+
+;; Copyright (C) 2001, 2003 by Joseph L. Casadonte Jr.
+;; Author:          Joe Casadonte (emacs@northbound-train.com)
+;; Maintainer:      Joe Casadonte (emacs@northbound-train.com)
+;; Created:         July 1, 2001
+;; Keywords:        bar cursor overwrite
+;; Latest Version:  http://www.northbound-train.com/emacs.html
+
+;; COPYRIGHT NOTICE
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+;;
+;;  Simple package to convert the block cursor into a bar cursor.  In
+;;  overwrite mode, the bar cursor changes back into a block cursor.
+;;  This is a quasi-minor mode, meaning that it can be turned on & off
+;;  easily though only globally (hence the quasi-)
+
+;;; Installation:
+;;
+;;  Put this file on your Emacs-Lisp load path and add the following to
+;;  your ~/.emacs startup file
+;;
+;;     (require 'bar-cursor)
+;;     (bar-cursor-mode 1)
+;;
+;;  To add a directory to your load-path, use something like the following:
+;;
+;;     (add-to-list 'load-path (expand-file-name "/some/load/path"))
+
+;;; Usage:
+;;
+;;  M-x `bar-cursor-mode'
+;;      Toggles bar-cursor-mode on & off.  Optional arg turns
+;;      bar-cursor-mode on if arg is a positive integer.
+;;
+;;  You may also use the custom interface to enable or disable it:
+;;
+;;  M-x customize-variable [RET] bar-cursor-mode [RET]
+
+;;; To Do:
+;;
+;;  o Nothing, at the moment.
+
+;;; Credits:
+;;
+;;  The basis for this code comes from Steve Kemp by way of the
+;;  NTEmacs mailing list.
+;;
+;;  Peter S. Galbraith <psg@debian.org> contributed a patch making
+;;  bar-cursor-mode customizable.
+
+;;; Comments:
+;;
+;;  Any comments, suggestions, bug reports or upgrade requests are welcome.
+;;  Please send them to Joe Casadonte (emacs@northbound-train.com).
+;;
+;;  This version of bar-cursor was developed and tested with NTEmacs
+;;  20.7.1 under Windows 2000 & NT 4.0 and Emacs 20.7.1 under Linux
+;;  (RH7).  Please, let me know if it works with other OS and versions
+;;  of Emacs.
+
+;;; Change Log:
+;;
+;;  see http://www.northbound-train.com/emacs/bar-cursor.log
+
+;;; **************************************************************************
+;;; **************************************************************************
+;;; **************************************************************************
+;;; **************************************************************************
+;;; **************************************************************************
+;;; Code:
+
+(eval-when-compile
+  ;; silence the old byte-compiler
+  (defvar byte-compile-dynamic nil)
+  (set (make-local-variable 'byte-compile-dynamic) t)
+  (require 'advice)
+  (defvar bar-cursor-mode))
+
+;;; **************************************************************************
+;;; ***** version related routines
+;;; **************************************************************************
+(defconst bar-cursor-version
+  "$Revision: 1.1 $"
+  "Version number for 'bar-cursor' package.")
+
+;; ---------------------------------------------------------------------------
+(defun bar-cursor-version-number ()
+  "Return 'bar-cursor' version number."
+  (string-match "[0123456789.]+" bar-cursor-version)
+  (match-string 0 bar-cursor-version))
+
+;; ---------------------------------------------------------------------------
+(defun bar-cursor-display-version ()
+  "Display 'bar-cursor' version."
+  (interactive)
+  (message "bar-cursor version <%s>." (bar-cursor-version-number)))
+
+;;; **************************************************************************
+;;; ***** real functions
+;;; **************************************************************************
+
+;;;###autoload
+(defun bar-cursor-mode (&optional arg)
+  "Toggle use of variable `bar-cursor-mode'.
+This quasi-minor mode changes cursor to a bar cursor in insert mode,
+and a block cursor in overwrite mode.  It may only be turned on and
+off globally, not on a per-buffer basis (hence the quasi- designation).
+
+Optional ARG turns mode on if ARG is a positive integer."
+  (interactive "P")
+
+  ;; toggle on and off
+  (let ((old-mode bar-cursor-mode))
+    (setq bar-cursor-mode
+          (if arg (or (listp arg)
+                      (> (prefix-numeric-value arg) 0))
+            (not bar-cursor-mode)))
+    
+    (when (not (equal old-mode bar-cursor-mode))
+      (bar-cursor-change))))
+
+;;;###autoload
+(defun bar-cursor-change ()
+  "Enable or disable advice based on value of variable `bar-cursor-mode'."
+  (if bar-cursor-mode
+      (ad-enable-advice 'overwrite-mode 'after 'bar-cursor-overwrite-mode-ad)
+    (ad-disable-advice 'overwrite-mode 'after 'bar-cursor-overwrite-mode-ad))
+
+  (ad-activate 'overwrite-mode)
+
+  ;; set the initial cursor type now
+  (bar-cursor-set-cursor)
+
+  ;; add or remove to frame hook
+  (if bar-cursor-mode
+      (add-hook 'after-make-frame-functions 'bar-cursor-set-cursor)
+    (remove-hook 'after-make-frame-functions 'bar-cursor-set-cursor)))
+
+;;;--------------------------------------------------------------------------
+(defadvice overwrite-mode (after bar-cursor-overwrite-mode-ad disable)
+  "Advice that controls what type of cursor is displayed."
+  (bar-cursor-set-cursor))
+
+;;;--------------------------------------------------------------------------
+(defun bar-cursor-set-cursor-type (cursor &optional frame)
+  "Set the `cursor-type' for the named frame.
+
+CURSOR is the name of the cursor to use (bar or block -- any others?).
+FRAME is optional frame to set the cursor for; current frame is used
+if not passed in."
+  (interactive)
+  (if (not frame)
+	  (setq frame (selected-frame)))
+
+  ;; Do the modification.
+  (modify-frame-parameters frame
+	(list (cons 'cursor-type cursor))))
+
+;;; --------------------------------------------------------------------------
+(defun bar-cursor-set-cursor (&optional frame)
+  "Set the `cursor-type' according to the insertion mode.
+
+FRAME is optional frame to set the cursor for; current frame is used
+if not passed in."
+  (if (and bar-cursor-mode (not overwrite-mode))
+	  (bar-cursor-set-cursor-type 'bar frame)
+	(bar-cursor-set-cursor-type 'box frame)))
+
+;;; --------------------------------------------------------------------------
+(defgroup bar-cursor nil
+  "switch block cursor to a bar."
+  :group 'convenience)
+
+(defcustom bar-cursor-mode nil
+  "*Non-nil means to convert the block cursor into a bar cursor.
+In overwrite mode, the bar cursor changes back into a block cursor.
+This is a quasi-minor mode, meaning that it can be turned on & off easily
+though only globally (hence the quasi-)"
+  :type 'boolean
+  :group 'bar-cursor
+  :require 'bar-cursor
+  :set (lambda (symbol value)
+         (set-default symbol value)
+         (bar-cursor-change)))
+
+;;; **************************************************************************
+;;; ***** we're done
+;;; **************************************************************************
+(provide 'bar-cursor)
+
+;;; bar-cursor.el ends here
+;;; **************************************************************************
+;;;; *****  EOF  *****  EOF  *****  EOF  *****  EOF  *****  EOF  *************