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 file))))))
55 (defun gnus-x-face-from-file (file)
56 "Insert an X-Face header based on an image file."
57 (interactive "fImage file name:" )
58 (when (file-exists-p file)
59 (shell-command-to-string
60 (format gnus-convert-image-to-x-face-command file))))
62 (defun gnus-convert-image-to-gray-x-face (file depth)
63 (let* ((mapfile (make-temp-name (expand-file-name "gnus." mm-tmp-directory)))
64 (levels (expt 2 depth))
65 (step (/ 255 (1- levels)))
66 color-alist bits bits-list mask pixel x-faces)
67 (with-temp-file mapfile
69 (insert (format "%d 1\n" levels))
72 (insert (format "%d %d %d\n"
73 (* step i) (* step i) (* step i)))
74 (push (cons (* step i) i) color-alist)))
75 (when (file-exists-p file)
77 (insert (shell-command-to-string (format "giftopnm '%s' | ppmnorm 2>/dev/null | pnmscale -width 48 -height 48 | ppmquant -map %s 2>/dev/null | ppmtopgm | pnmtoplainpnm"
79 (goto-char (point-min))
81 (while (setq pixel (ignore-errors (read (current-buffer))))
82 (push (cdr (assq pixel color-alist)) bits-list))
83 (setq bits-list (nreverse bits-list))
84 (dotimes (bit-number depth)
85 (setq mask (expt 2 bit-number))
87 (insert "P1\n48 48\n")
88 (dolist (bits bits-list)
89 (insert (if (zerop (logand bits mask)) "0 " "1 ")))
90 (shell-command-on-region
91 (point-min) (point-max)
94 (push (buffer-string) x-faces))))
95 (dotimes (i (length x-faces))
96 (insert (if (zerop i) "X-Face:" (format "X-Face-%s:" i))
98 (delete-file mapfile)))
101 (defun gnus-convert-gray-x-face-to-xpm (faces)
102 (let* ((depth (length faces))
103 (scale (/ 255 (1- (expt 2 depth))))
104 bit-list bit-lists pixels pixel)
108 (shell-command-on-region
109 (point-min) (point-max)
110 "uncompface -X | xbmtopbm | pnmtoplainpnm"
112 (goto-char (point-min))
116 ((eq (following-char) ?0)
118 ((eq (following-char) ?1)
121 (push bit-list bit-lists))
122 (dotimes (i (* 48 48))
124 (dotimes (plane depth)
125 (setq pixel (+ (* pixel 2) (nth i (nth plane bit-lists)))))
128 (insert "P2\n48 48\n255\n")
129 (dolist (pixel pixels)
130 (insert (number-to-string (* scale pixel)) " "))
131 (shell-command-on-region
132 (point-min) (point-max)
134 (current-buffer) t (get-buffer-create " *junk"))
138 (defun gnus-convert-gray-x-face-region (beg end)
139 "Convert the X-Faces in region to a PPM file."
141 (let ((input (buffer-substring beg end))
145 (goto-char (point-min))
148 (mail-header-narrow-to-field)
149 (push (mail-header-field-value) faces)
150 (goto-char (point-max)))))
151 (gnus-convert-gray-x-face-to-xpm faces)))
155 ;;; gnus-fun.el ends here