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+;;; smiley-ems.el --- displaying smiley faces
+
+;; Copyright (C) 2000 Free Software Foundation, Inc.
+
+;; Author: Dave Love <fx@gnu.org>
+;; Keywords: news mail multimedia
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; A re-written, simplified version of Wes Hardaker's XEmacs smiley.el
+;; which might be merged back to smiley.el if we get an assignment for
+;; that.  We don't have assignments for the images smiley.el uses, but
+;; I'm not sure we need that degree of rococoness and defaults like a
+;; yellow background.  Also, using PBM means we can display the images
+;; more generally.  -- fx
+
+;;; Test smileys:  :-) :-\ :-( :-/
+
+;;; Code:
+
+(require 'nnheader)
+
+(defgroup smiley nil
+  "Turn :-)'s into real images."
+  :group 'gnus-visual)
+
+;; Maybe this should go.
+(defcustom smiley-data-directory (nnheader-find-etc-directory "smilies")
+  "*Location of the smiley faces files."
+  :type 'directory
+  :group 'smiley)
+
+;; The XEmacs version has a baroque, if not rococo, set of these.
+(defcustom smiley-regexp-alist
+  ;; Perhaps :-) should be distinct -- it does appear in the Jargon File.
+  '(("\\([:;]-?)\\)\\W" 1 "smile.pbm")
+    ("\\(:-[/\\]\\)\\W" 1 "wry.pbm")
+    ("\\(:-[({]\\)\\W" 1 "frown.pbm"))
+  "*A list of regexps to map smilies to images.
+The elements are (REGEXP MATCH FILE), where MATCH is the submatch in
+rgexp to replace with IMAGE.  IMAGE is the name of a PBM file in
+`smiley-data-directory'."
+  :type '(repeat (list regexp
+                      (integer :tag "Regexp match number")
+                      (string :tag "Image name")))
+  :set (lambda (symbol value)
+        (set-default symbol value)
+        (smiley-update-cache))
+  :initialize 'custom-initialize-default
+  :group 'smiley)
+
+(defvar smiley-cached-regexp-alist nil)
+
+(defun smiley-update-cache ()
+  (dolist (elt smiley-regexp-alist)
+    (let* ((data-directory smiley-data-directory)
+          (image (find-image (list (list :type 'pbm
+                                         :file (nth 2 elt)
+                                         :ascent 100)))))
+      (if image
+         (push (list (car elt) (cadr elt) image)
+               smiley-cached-regexp-alist)))))
+
+(defvar smiley-active nil
+  "Non-nil means smilies in the buffer will be displayed.")
+(make-variable-buffer-local 'smiley-active)
+
+(defvar smiley-mouse-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map [down-mouse-2] 'ignore) ; override widget
+    (define-key map [mouse-2]
+      'smiley-mouse-toggle-buffer)
+    map))
+
+;;;###autoload
+(defun smiley-region (start end)
+  "Replace in the region `smiley-regexp-alist' matches with corresponding images."
+  (interactive "r")
+  (when (and (fboundp 'display-graphic-p)
+            (display-graphic-p))
+    (mapc (lambda (o)
+           (if (eq 'smiley (overlay-get o 'smiley))
+               (delete-overlay o)))
+         (overlays-in start end))
+    (unless smiley-cached-regexp-alist
+      (smiley-update-cache))
+    (save-excursion
+      (let ((beg (or start (point-min)))
+           group overlay image)
+       (dolist (entry smiley-cached-regexp-alist)
+         (setq group (nth 1 entry)
+               image (nth 2 entry))
+         (goto-char beg)
+         (while (re-search-forward (car entry) end t)
+           (when image
+             (setq overlay (make-overlay (match-beginning group)
+                                         (match-end group)))
+             (overlay-put overlay
+                          'display `(when smiley-active ,@image))
+             (overlay-put overlay 'mouse-face 'highlight)
+             (overlay-put overlay 'smiley t)
+             (overlay-put overlay
+                          'help-echo "mouse-2: toggle smilies in buffer")
+             (overlay-put overlay 'keymap smiley-mouse-map))))))
+        (setq smiley-active t)))
+
+(defun smiley-toggle-buffer (&optional arg)
+  "Toggle displaying smiley faces.
+With arg, turn displaying on if and only if arg is positive."
+  (interactive "P")
+  (if (numberp arg)
+      (setq smiley-active (> arg 0))
+    (setq smiley-active (not smiley-active))))
+
+(defun smiley-mouse-toggle-buffer (event)
+  "Toggle displaying smiley faces.
+With arg, turn displaying on if and only if arg is positive."
+  (interactive "e")
+  (save-excursion
+    (save-window-excursion
+      (mouse-set-point event)
+      (smiley-toggle-buffer))))
+
+(eval-when-compile (defvar gnus-article-buffer))
+
+(defun gnus-smiley-display (&optional arg)
+  "Display textual emoticaons (\"smilies\") as small graphical icons.
+With arg, turn displaying on if and only if arg is positive."
+  (interactive "P")
+  (save-excursion
+    (set-buffer gnus-article-buffer)
+    (save-restriction
+      (widen)
+      (article-goto-body)
+      (smiley-region (point-min) (point-max))
+      (if (and (numberp arg) (<= arg 0))
+         (smiley-toggle-buffer arg)))))
+
+(provide 'smiley)
+
+;;; smiley-ems.el ends here