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+;;; autosmiley.el --- Convert smileys into their graphical representation
+
+;; Author: Damyan Pepper (gmail account, username damyanp)
+;; Created: 20060315
+
+;; 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; if not, you can either send email to this
+;; program's maintainer or write to: The Free Software Foundation,
+;; Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Defines the minor mode autosmiley-mode that converts smileys like
+;; :-) into their graphical representations on the fly.
+
+;; Tested on:
+;;
+;; GNU Emacs 22.0.50.1 (i386-mingw-nt5.1.2600) of 2006-03-14 on W2ONE
+;;
+;; History:
+;;
+;; 20060315 - First Release
+
+
+
+(require 'smiley)
+
+(defun autosmiley-overlay-p (overlay)
+  "Return whether OVERLAY is an overlay of autosmiley mode."
+  (memq (overlay-get overlay 'category)
+		'(autosmiley)))
+
+(defun autosmiley-remove-smileys (beg end)
+  (dolist (o (overlays-in beg end))
+	(when (autosmiley-overlay-p o)
+	  (delete-overlay o))))
+
+(defvar *autosmiley-counter* 0
+  "Each smiley needs to have a unique display string otherwise
+  adjacent smileys will be merged into a single image.  So we put
+  a counter on each one to make them unique")
+
+(defun autosmiley-add-smiley (beg end image)  
+  (let ((overlay (make-overlay beg end)))
+	(overlay-put overlay 'category 'autosmiley)
+	(overlay-put overlay 'display (append image (list :counter (incf *autosmiley-counter*))))))
+
+
+(defun autosmiley-add-smileys (beg end)
+  (save-excursion
+	(dolist (entry smiley-cached-regexp-alist)
+	  (let ((regexp (car entry))
+			(group (nth 1 entry))
+			(image (nth 2 entry)))
+		(when image
+		  (goto-char beg)
+		  (while (re-search-forward regexp end t)
+			(autosmiley-add-smiley (match-beginning group) (match-end group) image)))))))
+
+
+(defun autosmiley-change (beg end &optional old-len)
+  (let ((beg-line (save-excursion (goto-char beg) (line-beginning-position)))
+		(end-line (save-excursion (goto-char end) (line-end-position))))
+	(autosmiley-remove-smileys beg-line end-line)
+	(autosmiley-add-smileys beg-line end-line)))
+  
+
+;;;###autoload
+(define-minor-mode autosmiley-mode
+  "Minor mode for automatically replacing smileys in text with
+cute little graphical smileys."
+  :group 'autosmiley :lighter " :)"
+  (save-excursion
+	(save-restriction
+	  (widen)
+	  (autosmiley-remove-smileys (point-min) (point-max))
+	  (if autosmiley-mode
+		  (progn
+			(unless smiley-cached-regexp-alist
+			  (smiley-update-cache))
+			(jit-lock-register 'autosmiley-change))
+		(jit-lock-unregister 'autosmiley-change)))))
+
+
+(provide 'autosmiley)