lisp/gnus/gnus-fun.el

   1 ;;; gnus-fun.el --- various frivolous extension functions to Gnus
   2
   3 ;; Copyright (C) 2002-2014 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 of the License, or
  13 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;;; Code:
  26
  27 ;; For Emacs <22.2 and XEmacs.
  28 (eval-and-compile
  29   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  30
  31 (eval-when-compile
  32   (require 'cl))
  33
  34 (require 'mm-util)
  35 (require 'gnus-ems)
  36 (require 'gnus-util)
  37 (require 'gnus)
  38
  39 (defvar gnus-face-properties-alist)
  40
  41 (defcustom gnus-x-face-directory (expand-file-name "x-faces" gnus-directory)
  42   "*Directory where X-Face PBM files are stored."
  43   :version "22.1"
  44   :group 'gnus-fun
  45   :type 'directory)
  46
  47 (defcustom gnus-convert-pbm-to-x-face-command "pbmtoxbm %s | compface"
  48   "Command for converting a PBM to an X-Face."
  49   :version "22.1"
  50   :group 'gnus-fun
  51   :type 'string)
  52
  53 (defcustom gnus-convert-image-to-x-face-command
  54   "convert -scale 48x48! %s xbm:- | xbm2xface.pl"
  55   "Command for converting an image to an X-Face.
  56 The command must take a image filename (use \"%s\") as input.
  57 The output must be the X-Face header data on stdout."
  58   :version "22.1"
  59   :group 'gnus-fun
  60   :type '(choice (const :tag "giftopnm, netpbm (GIF input only)"
  61                         "giftopnm %s | ppmnorm | pnmscale -width 48 -height 48 | ppmtopgm | pgmtopbm | pbmtoxbm | compface")
  62                  (const :tag "convert"
  63                         "convert -scale 48x48! %s xbm:- | xbm2xface.pl")
  64                  (string)))
  65
  66 (defcustom gnus-convert-image-to-face-command
  67   "convert -scale 48x48! %s -colors %d png:-"
  68   "Command for converting an image to a Face.
  69
  70 The command must take an image filename (first format argument
  71 \"%s\") and the number of colors (second format argument: \"%d\")
  72 as input.  The output must be the Face header data on stdout in
  73 PNG format."
  74   :version "22.1"
  75   :group 'gnus-fun
  76   :type '(choice (const :tag "djpeg, netpbm (JPG input only)"
  77                         "djpeg %s | ppmnorm | pnmscale -width 48 -height 48 | ppmquant %d | pnmtopng")
  78                  (const :tag "convert"
  79                         "convert -scale 48x48! %s -colors %d png:-")
  80                  (string)))
  81
  82 (defun gnus-shell-command-to-string (command)
  83   "Like `shell-command-to-string' except not mingling ERROR."
  84   (with-output-to-string
  85     (call-process shell-file-name nil (list standard-output nil)
  86                   nil shell-command-switch command)))
  87
  88 ;;;###autoload
  89 (defun gnus-random-x-face ()
  90   "Return X-Face header data chosen randomly from `gnus-x-face-directory'."
  91   (interactive)
  92   (when (file-exists-p gnus-x-face-directory)
  93     (let* ((files (directory-files gnus-x-face-directory t "\\.pbm$"))
  94            (file (nth (random (length files)) files)))
  95       (when file
  96         (gnus-shell-command-to-string
  97          (format gnus-convert-pbm-to-x-face-command
  98                  (shell-quote-argument file)))))))
  99
 100 (autoload 'message-goto-eoh "message" nil t)
 101
 102 ;;;###autoload
 103 (defun gnus-insert-random-x-face-header ()
 104   "Insert a random X-Face header from `gnus-x-face-directory'."
 105   (interactive)
 106   (let ((data (gnus-random-x-face)))
 107     (save-excursion
 108       (message-goto-eoh)
 109       (if data
 110           (insert "X-Face: " data)
 111         (message
 112          "No face returned by `gnus-random-x-face'.  Does %s/*.pbm exist?"
 113          gnus-x-face-directory)))))
 114
 115 ;;;###autoload
 116 (defun gnus-x-face-from-file (file)
 117   "Insert an X-Face header based on an image file.
 118
 119 Depending on `gnus-convert-image-to-x-face-command' it may accept
 120 different input formats."
 121   (interactive "fImage file name: ")
 122   (when (file-exists-p file)
 123     (gnus-shell-command-to-string
 124      (format gnus-convert-image-to-x-face-command
 125              (shell-quote-argument (expand-file-name file))))))
 126
 127 ;;;###autoload
 128 (defun gnus-face-from-file (file)
 129   "Return a Face header based on an image file.
 130
 131 Depending on `gnus-convert-image-to-face-command' it may accept
 132 different input formats."
 133   (interactive "fImage file name: ")
 134   (when (file-exists-p file)
 135     (let ((done nil)
 136           (attempt "")
 137           (quant 16))
 138       (while (and (not done)
 139                   (> quant 1))
 140         (setq attempt
 141               (let ((coding-system-for-read 'binary))
 142                 (gnus-shell-command-to-string
 143                  (format gnus-convert-image-to-face-command
 144                          (shell-quote-argument (expand-file-name file))
 145                          quant))))
 146         (if (> (length attempt) 726)
 147             (progn
 148               (setq quant (- quant (if (< quant 10) 1 2)))
 149               (gnus-message 9 "Length %d; trying quant %d"
 150                             (length attempt) quant))
 151           (setq done t)))
 152       (if done
 153           (mm-with-unibyte-buffer
 154             (insert attempt)
 155             (gnus-face-encode))
 156         nil))))
 157
 158 (defun gnus-face-encode ()
 159   (let ((step 72))
 160     (base64-encode-region (point-min) (point-max))
 161     (goto-char (point-min))
 162     (while (search-forward "\n" nil t)
 163       (replace-match ""))
 164     (goto-char (point-min))
 165     (while (> (- (point-max) (point))
 166               step)
 167       (forward-char step)
 168       (insert "\n ")
 169       (setq step 76))
 170     (buffer-string)))
 171
 172 ;;;###autoload
 173 (defun gnus-convert-face-to-png (face)
 174   "Convert FACE (which is base64-encoded) to a PNG.
 175 The PNG is returned as a string."
 176   (mm-with-unibyte-buffer
 177     (insert face)
 178     (ignore-errors
 179       (base64-decode-region (point-min) (point-max)))
 180     (buffer-string)))
 181
 182 ;;;###autoload
 183 (defun gnus-convert-png-to-face (file)
 184   "Convert FILE to a Face.
 185 FILE should be a PNG file that's 48x48 and smaller than or equal to
 186 726 bytes."
 187   (mm-with-unibyte-buffer
 188     (insert-file-contents file)
 189     (when (> (buffer-size) 726)
 190       (error "The file is %d bytes long, which is too long"
 191              (buffer-size)))
 192     (gnus-face-encode)))
 193
 194 (defface gnus-x-face '((t (:foreground "black" :background "white")))
 195   "Face to show X-Face.
 196 The colors from this face are used as the foreground and background
 197 colors of the displayed X-Faces."
 198   :group 'gnus-article-headers)
 199
 200 (declare-function article-narrow-to-head   "gnus-art" ())
 201 (declare-function gnus-article-goto-header "gnus-art" (header))
 202 (declare-function gnus-add-image           "gnus-art" (category image))
 203 (declare-function gnus-add-wash-type       "gnus-art" (type))
 204
 205 (defun gnus-display-x-face-in-from (data)
 206   "Display the X-Face DATA in the From header."
 207   (require 'gnus-art)
 208   (let (pbm)
 209     (when (or (gnus-image-type-available-p 'xface)
 210               (and (gnus-image-type-available-p 'pbm)
 211                    (setq pbm (uncompface data))))
 212       (save-excursion
 213         (save-restriction
 214           (article-narrow-to-head)
 215           (gnus-article-goto-header "from")
 216           (when (bobp)
 217             (insert "From: [no `from' set]\n")
 218             (forward-char -17))
 219           (gnus-add-image
 220            'xface
 221            (gnus-put-image
 222             (if (gnus-image-type-available-p 'xface)
 223                 (apply 'gnus-create-image (concat "X-Face: " data) 'xface t
 224                        (cdr (assq 'xface gnus-face-properties-alist)))
 225               (apply 'gnus-create-image pbm 'pbm t
 226                      (cdr (assq 'pbm gnus-face-properties-alist))))
 227             nil 'xface))
 228           (gnus-add-wash-type 'xface))))))
 229
 230 (defun gnus-grab-cam-x-face ()
 231   "Grab a picture off the camera and make it into an X-Face."
 232   (interactive)
 233   (shell-command "xawtv-remote snap ppm")
 234   (let ((file nil))
 235     (while (null (setq file (directory-files "/tftpboot/sparky/tmp"
 236                                              t "snap.*ppm")))
 237       (sleep-for 1))
 238     (setq file (car file))
 239     (with-temp-buffer
 240       (shell-command
 241        (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"
 242                file)
 243        (current-buffer))
 244       ;;(sleep-for 3)
 245       (delete-file file)
 246       (buffer-string))))
 247
 248 (defun gnus-grab-cam-face ()
 249   "Grab a picture off the camera and make it into an X-Face."
 250   (interactive)
 251   (shell-command "xawtv-remote snap ppm")
 252   (let ((file nil)
 253         result)
 254     (while (null (setq file (directory-files "/tftpboot/sparky/tmp"
 255                                              t "snap.*ppm")))
 256       (sleep-for 1))
 257     (setq file (car file))
 258     (shell-command
 259      (format "pnmcut -left 110 -top 30 -width 144 -height 144 '%s' | pnmscale -width 48 -height 48 | ppmtopgm > /tmp/gnus.face.ppm"
 260              file))
 261     (let ((gnus-convert-image-to-face-command
 262            (format "cat '%%s' | ppmquant %%d | ppmchange %s | pnmtopng"
 263                    (gnus-fun-ppm-change-string))))
 264       (setq result (gnus-face-from-file "/tmp/gnus.face.ppm")))
 265     (delete-file file)
 266     ;;(delete-file "/tmp/gnus.face.ppm")
 267     result))
 268
 269 (defun gnus-fun-ppm-change-string ()
 270   (let* ((possibilities '("%02x0000" "00%02x00" "0000%02x"
 271                           "%02x%02x00" "00%02x%02x" "%02x00%02x"))
 272          (format (concat "'#%02x%02x%02x' '#"
 273                          (nth (random 6) possibilities)
 274                          "'"))
 275          (values nil))
 276   (dotimes (i 255)
 277     (push (format format i i i i i i)
 278           values))
 279   (mapconcat 'identity values " ")))
 280
 281 (defun gnus-funcall-no-warning (function &rest args)
 282   (when (fboundp function)
 283     (apply function args)))
 284
 285 (provide 'gnus-fun)
 286
 287 ;;; gnus-fun.el ends here