code.delx.au - gnu-emacs/blob - lisp/gnus/gnus-fun.el

   1 ;;; gnus-fun.el --- various frivolous extension functions to Gnus
   2
   3 ;; Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; Keywords: news
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 3, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29 ;; For Emacs < 22.2.
  30 (eval-and-compile
  31   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  32
  33 (eval-when-compile
  34   (require 'cl))
  35
  36 (require 'mm-util)
  37 (require 'gnus-ems)
  38 (require 'gnus-util)
  39 (require 'gnus)
  40
  41 (defvar gnus-face-properties-alist)
  42
  43 (defcustom gnus-x-face-directory (expand-file-name "x-faces" gnus-directory)
  44   "*Directory where X-Face PBM files are stored."
  45   :version "22.1"
  46   :group 'gnus-fun
  47   :type 'directory)
  48
  49 (defcustom gnus-convert-pbm-to-x-face-command "pbmtoxbm %s | compface"
  50   "Command for converting a PBM to an X-Face."
  51   :version "22.1"
  52   :group 'gnus-fun
  53   :type 'string)
  54
  55 (defcustom gnus-convert-image-to-x-face-command
  56   "convert -scale 48x48! %s xbm:- | xbm2xface.pl"
  57   "Command for converting an image to an X-Face.
  58 The command must take a image filename (use \"%s\") as input.
  59 The output must be the Face header data on stdout in PNG format.
  60
  61 By default it takes a GIF filename and output the X-Face header data
  62 on stdout."
  63   :version "22.1"
  64   :group 'gnus-fun
  65   :type '(choice (const :tag "giftopnm, netpbm (GIF input only)"
  66                         "giftopnm %s | ppmnorm | pnmscale -width 48 -height 48 | ppmtopgm | pgmtopbm | pbmtoxbm | compface")
  67                  (const :tag "convert"
  68                         "convert -scale 48x48! %s xbm:- | xbm2xface.pl")
  69                  (string)))
  70
  71 (defcustom gnus-convert-image-to-face-command
  72   "convert -scale 48x48! %s -colors %d png:-"
  73   "Command for converting an image to a Face.
  74
  75 The command must take an image filename (first format argument
  76 \"%s\") and the number of colors (second format argument: \"%d\")
  77 as input.  The output must be the Face header data on stdout in
  78 PNG format."
  79   :version "22.1"
  80   :group 'gnus-fun
  81   :type '(choice (const :tag "djpeg, netpbm (JPG input only)"
  82                         "djpeg %s | ppmnorm | pnmscale -width 48 -height 48 | ppmquant %d | pnmtopng")
  83                  (const :tag "convert"
  84                         "convert -scale 48x48! %s -colors %d png:-")
  85                  (string)))
  86
  87 (defun gnus-shell-command-to-string (command)
  88   "Like `shell-command-to-string' except not mingling ERROR."
  89   (with-output-to-string
  90     (call-process shell-file-name nil (list standard-output nil)
  91                   nil shell-command-switch command)))
  92
  93 (defun gnus-shell-command-on-region (start end command)
  94   "A simplified `shell-command-on-region'.
  95 Output to the current buffer, replace text, and don't mingle error."
  96   (call-process-region start end shell-file-name t
  97                        (list (current-buffer) nil)
  98                        nil shell-command-switch command))
  99
 100 ;;;###autoload
 101 (defun gnus-random-x-face ()
 102   "Return X-Face header data chosen randomly from `gnus-x-face-directory'."
 103   (interactive)
 104   (when (file-exists-p gnus-x-face-directory)
 105     (let* ((files (directory-files gnus-x-face-directory t "\\.pbm$"))
 106            (file (nth (random (length files)) files)))
 107       (when file
 108         (gnus-shell-command-to-string
 109          (format gnus-convert-pbm-to-x-face-command
 110                  (shell-quote-argument file)))))))
 111
 112 (autoload 'message-goto-eoh "message" nil t)
 113
 114 ;;;###autoload
 115 (defun gnus-insert-random-x-face-header ()
 116   "Insert a random X-Face header from `gnus-x-face-directory'."
 117   (interactive)
 118   (let ((data (gnus-random-x-face)))
 119     (save-excursion
 120       (message-goto-eoh)
 121       (if data
 122           (insert "X-Face: " data)
 123         (message
 124          "No face returned by `gnus-random-x-face'.  Does %s/*.pbm exist?"
 125          gnus-x-face-directory)))))
 126
 127 ;;;###autoload
 128 (defun gnus-x-face-from-file (file)
 129   "Insert an X-Face header based on an image file.
 130
 131 Depending on `gnus-convert-image-to-x-face-command' it may accept
 132 different input formats."
 133   (interactive "fImage file name: ")
 134   (when (file-exists-p file)
 135     (gnus-shell-command-to-string
 136      (format gnus-convert-image-to-x-face-command
 137              (shell-quote-argument (expand-file-name file))))))
 138
 139 ;;;###autoload
 140 (defun gnus-face-from-file (file)
 141   "Return a Face header based on an image file.
 142
 143 Depending on `gnus-convert-image-to-face-command' it may accept
 144 different input formats."
 145   (interactive "fImage file name: ")
 146   (when (file-exists-p file)
 147     (let ((done nil)
 148           (attempt "")
 149           (quant 16))
 150       (while (and (not done)
 151                   (> quant 1))
 152         (setq attempt
 153               (let ((coding-system-for-read 'binary))
 154                 (gnus-shell-command-to-string
 155                  (format gnus-convert-image-to-face-command
 156                          (shell-quote-argument (expand-file-name file))
 157                          quant))))
 158         (if (> (length attempt) 726)
 159             (progn
 160               (setq quant (- quant (if (< quant 10) 1 2)))
 161               (gnus-message 9 "Length %d; trying quant %d"
 162                             (length attempt) quant))
 163           (setq done t)))
 164       (if done
 165           (mm-with-unibyte-buffer
 166             (insert attempt)
 167             (gnus-face-encode))
 168         nil))))
 169
 170 (defun gnus-face-encode ()
 171   (let ((step 72))
 172     (base64-encode-region (point-min) (point-max))
 173     (goto-char (point-min))
 174     (while (search-forward "\n" nil t)
 175       (replace-match ""))
 176     (goto-char (point-min))
 177     (while (> (- (point-max) (point))
 178               step)
 179       (forward-char step)
 180       (insert "\n ")
 181       (setq step 76))
 182     (buffer-string)))
 183
 184 ;;;###autoload
 185 (defun gnus-convert-face-to-png (face)
 186   "Convert FACE (which is base64-encoded) to a PNG.
 187 The PNG is returned as a string."
 188   (mm-with-unibyte-buffer
 189     (insert face)
 190     (ignore-errors
 191       (base64-decode-region (point-min) (point-max)))
 192     (buffer-string)))
 193
 194 ;;;###autoload
 195 (defun gnus-convert-png-to-face (file)
 196   "Convert FILE to a Face.
 197 FILE should be a PNG file that's 48x48 and smaller than or equal to
 198 726 bytes."
 199   (mm-with-unibyte-buffer
 200     (insert-file-contents file)
 201     (when (> (buffer-size) 726)
 202       (error "The file is %d bytes long, which is too long"
 203              (buffer-size)))
 204     (gnus-face-encode)))
 205
 206 (defface gnus-x-face '((t (:foreground "black" :background "white")))
 207   "Face to show X-Face.
 208 The colors from this face are used as the foreground and background
 209 colors of the displayed X-Faces."
 210   :group 'gnus-article-headers)
 211
 212 (declare-function article-narrow-to-head   "gnus-art" ())
 213 (declare-function gnus-article-goto-header "gnus-art" (header))
 214 (declare-function gnus-add-image           "gnus-art" (category image))
 215 (declare-function gnus-add-wash-type       "gnus-art" (type))
 216
 217 (defun gnus-display-x-face-in-from (data)
 218   "Display the X-Face DATA in the From header."
 219   (require 'gnus-art)
 220   (let ((default-enable-multibyte-characters nil)
 221         pbm)
 222     (when (or (gnus-image-type-available-p 'xface)
 223               (and (gnus-image-type-available-p 'pbm)
 224                    (setq pbm (uncompface data))))
 225       (save-excursion
 226         (save-restriction
 227           (article-narrow-to-head)
 228           (gnus-article-goto-header "from")
 229           (when (bobp)
 230             (insert "From: [no `from' set]\n")
 231             (forward-char -17))
 232           (gnus-add-image
 233            'xface
 234            (gnus-put-image
 235             (if (gnus-image-type-available-p 'xface)
 236                 (apply 'gnus-create-image (concat "X-Face: " data) 'xface t
 237                        (cdr (assq 'xface gnus-face-properties-alist)))
 238               (apply 'gnus-create-image pbm 'pbm t
 239                      (cdr (assq 'pbm gnus-face-properties-alist))))
 240             nil 'xface))
 241           (gnus-add-wash-type 'xface))))))
 242
 243 (defun gnus-grab-cam-x-face ()
 244   "Grab a picture off the camera and make it into an X-Face."
 245   (interactive)
 246   (shell-command "xawtv-remote snap ppm")
 247   (let ((file nil))
 248     (while (null (setq file (directory-files "/tftpboot/sparky/tmp"
 249                                              t "snap.*ppm")))
 250       (sleep-for 1))
 251     (setq file (car file))
 252     (with-temp-buffer
 253       (shell-command
 254        (format "pnmcut -left 110 -top 30 -width 144 -height 144 '%s' | ppmnorm 2>/dev/null | pnmscale -width 48 | ppmtopgm | pgmtopbm -threshold -value 0.92 | pbmtoxbm | compface"
 255                file)
 256        (current-buffer))
 257       ;;(sleep-for 3)
 258       (delete-file file)
 259       (buffer-string))))
 260
 261 (defun gnus-grab-cam-face ()
 262   "Grab a picture off the camera and make it into an X-Face."
 263   (interactive)
 264   (shell-command "xawtv-remote snap ppm")
 265   (let ((file nil)
 266         result)
 267     (while (null (setq file (directory-files "/tftpboot/sparky/tmp"
 268                                              t "snap.*ppm")))
 269       (sleep-for 1))
 270     (setq file (car file))
 271     (shell-command
 272      (format "pnmcut -left 110 -top 30 -width 144 -height 144 '%s' | pnmscale -width 48 -height 48 | ppmtopgm > /tmp/gnus.face.ppm"
 273              file))
 274     (let ((gnus-convert-image-to-face-command
 275            (format "cat '%%s' | ppmquant %%d | ppmchange %s | pnmtopng"
 276                    (gnus-fun-ppm-change-string))))
 277       (setq result (gnus-face-from-file "/tmp/gnus.face.ppm")))
 278     (delete-file file)
 279     ;;(delete-file "/tmp/gnus.face.ppm")
 280     result))
 281
 282 (defun gnus-fun-ppm-change-string ()
 283   (let* ((possibilites '("%02x0000" "00%02x00" "0000%02x"
 284                         "%02x%02x00" "00%02x%02x" "%02x00%02x"))
 285          (format (concat "'#%02x%02x%02x' '#"
 286                          (nth (random 6) possibilites)
 287                          "'"))
 288          (values nil))
 289   (dotimes (i 255)
 290     (push (format format i i i i i i)
 291           values))
 292   (mapconcat 'identity values " ")))
 293
 294 (provide 'gnus-fun)
 295
 296 ;;; arch-tag: 9d000a69-15cc-4491-9dc0-4627484f50c1
 297 ;;; gnus-fun.el ends here