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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)
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