1 ;;; gnus-fun.el --- various frivoluos extension functions to Gnus
2 ;; Copyright (C) 2002 Free Software Foundation, Inc.
4 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software; you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 ;; Boston, MA 02111-1307, USA.
28 (defcustom gnus-x-face-directory (expand-file-name "x-faces" gnus-directory)
29 "*Directory where X-Face PBM files are stored."
33 (defcustom gnus-convert-pbm-to-x-face-command "pbmtoxbm %s | compface"
34 "Command for converting a PBM to an X-Face."
38 (defcustom gnus-convert-image-to-x-face-command "giftopnm %s | ppmnorm 2>/dev/null | pnmscale -width 48 -height 48 | ppmtopgm | pgmtopbm | pbmtoxbm | compface"
39 "Command for converting a GIF to an X-Face."
44 (defun gnus-random-x-face ()
45 "Insert a random X-Face header from `gnus-x-face-directory'."
47 (when (file-exists-p gnus-x-face-directory)
48 (let* ((files (directory-files gnus-x-face-directory t "\\.pbm$"))
49 (file (nth (random (length files)) files)))
51 (shell-command-to-string
52 (format gnus-convert-pbm-to-x-face-command
53 (shell-quote-argument file)))))))
56 (defun gnus-x-face-from-file (file)
57 "Insert an X-Face header based on an image file."
58 (interactive "fImage file name:" )
59 (when (file-exists-p file)
60 (shell-command-to-string
61 (format gnus-convert-image-to-x-face-command
62 (shell-quote-argument file)))))
64 (defun gnus-convert-image-to-gray-x-face (file depth)
65 (let* ((mapfile (make-temp-name (expand-file-name "gnus." mm-tmp-directory)))
66 (levels (expt 2 depth))
67 (step (/ 255 (1- levels)))
68 color-alist bits bits-list mask pixel x-faces)
69 (with-temp-file mapfile
71 (insert (format "%d 1\n" levels))
74 (insert (format "%d %d %d\n"
75 (* step i) (* step i) (* step i)))
76 (push (cons (* step i) i) color-alist)))
77 (when (file-exists-p file)
79 (insert (shell-command-to-string
80 (format "giftopnm %s | ppmnorm 2>/dev/null | pnmscale -width 48 -height 48 | ppmquant -fs -map %s 2>/dev/null | ppmtopgm | pnmnoraw"
81 (shell-quote-argument file)
83 (goto-char (point-min))
85 (while (setq pixel (ignore-errors (read (current-buffer))))
86 (push (cdr (assq pixel color-alist)) bits-list))
87 (setq bits-list (nreverse bits-list))
88 (dotimes (bit-number depth)
89 (setq mask (expt 2 bit-number))
91 (insert "P1\n48 48\n")
92 (dolist (bits bits-list)
93 (insert (if (zerop (logand bits mask)) "0 " "1 ")))
94 (shell-command-on-region
95 (point-min) (point-max)
98 (push (buffer-string) x-faces))))
99 (dotimes (i (length x-faces))
100 (insert (if (zerop i) "X-Face:" (format "X-Face-%s:" i))
102 (delete-file mapfile)))
105 (defun gnus-convert-gray-x-face-to-xpm (faces)
106 (let* ((depth (length faces))
107 (scale (/ 255 (1- (expt 2 depth))))
109 bit-list bit-lists pixels pixel)
113 (insert (uncompface face))
114 (shell-command-on-region
115 (point-min) (point-max)
116 "pnmnoraw 2>/dev/null"
118 (goto-char (point-min))
122 ((eq (following-char) ?0)
124 ((eq (following-char) ?1)
127 (unless (= (length bit-list) (* 48 48))
129 (push bit-list bit-lists))
131 (dotimes (i (* 48 48))
133 (dotimes (plane depth)
134 (setq pixel (+ (* pixel 2) (nth i (nth plane bit-lists)))))
137 (insert "P2\n48 48\n255\n")
138 (dolist (pixel pixels)
139 (insert (number-to-string (* scale pixel)) " "))
140 (shell-command-on-region
141 (point-min) (point-max)
142 "ppmtoxpm 2>/dev/null"
147 (defun gnus-convert-gray-x-face-region (beg end)
148 "Convert the X-Faces in region to a PPM file."
150 (let ((input (buffer-substring beg end))
154 (goto-char (point-min))
157 (mail-header-narrow-to-field)
158 (push (mail-header-field-value) faces)
159 (goto-char (point-max)))))
160 (gnus-convert-gray-x-face-to-xpm faces)))
162 (defface gnus-x-face '((t (:foreground "black" :background "white")))
163 "Face to show X-Face.
164 The colors from this face are used as the foreground and background
165 colors of the displayed X-Faces."
166 :group 'gnus-article-headers)
168 (defun gnus-display-x-face-in-from (data)
169 "Display the X-Face DATA in the From header."
170 (let ((default-enable-multibyte-characters nil)
172 (when (or (gnus-image-type-available-p 'xface)
173 (and (gnus-image-type-available-p 'pbm)
174 (setq pbm (uncompface data))))
177 (article-narrow-to-head)
178 (gnus-article-goto-header "from")
182 (if (gnus-image-type-available-p 'xface)
184 (concat "X-Face: " data)
185 'xface t :ascent 'center :face 'gnus-x-face)
187 pbm 'pbm t :ascent 'center :face 'gnus-x-face))))
188 (gnus-add-wash-type 'xface))))))
192 ;;; gnus-fun.el ends here