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

   1 ;;; gnus-picon.el --- displaying pretty icons in Gnus
   2
   3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;; Keywords: news xpm annotation glyph faces
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; There are three picon types relevant to Gnus:
  27 ;;
  28 ;; Persons: person@subdomain.dom
  29 ;;          users/dom/subdomain/person/face.gif
  30 ;;          usenix/dom/subdomain/person/face.gif
  31 ;;          misc/MISC/person/face.gif
  32 ;; Domains: subdomain.dom
  33 ;;          domain/dom/subdomain/unknown/face.gif
  34 ;; Groups:  comp.lang.lisp
  35 ;;          news/comp/lang/lisp/unknown/face.gif
  36 ;;
  37 ;; Original implementation by Wes Hardaker <hardaker@ece.ucdavis.edu>.
  38 ;;
  39 ;;; Code:
  40
  41 ;; For Emacs < 22.2.
  42 (eval-and-compile
  43   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  44
  45 (eval-when-compile (require 'cl))
  46
  47 (require 'gnus)
  48 (require 'gnus-art)
  49
  50 ;;; User variables:
  51
  52 (defcustom gnus-picon-news-directories '("news")
  53   "*List of directories to search for newsgroups faces."
  54   :type '(repeat string)
  55   :group 'gnus-picon)
  56
  57 (defcustom gnus-picon-user-directories '("users" "usenix" "local" "misc")
  58   "*List of directories to search for user faces."
  59   :type '(repeat string)
  60   :group 'gnus-picon)
  61
  62 (defcustom gnus-picon-domain-directories '("domains")
  63   "*List of directories to search for domain faces.
  64 Some people may want to add \"unknown\" to this list."
  65   :type '(repeat string)
  66   :group 'gnus-picon)
  67
  68 (defcustom gnus-picon-file-types
  69   (let ((types (list "xbm")))
  70     (when (gnus-image-type-available-p 'gif)
  71       (push "gif" types))
  72     (when (gnus-image-type-available-p 'xpm)
  73       (push "xpm" types))
  74     types)
  75   "*List of suffixes on picon file names to try."
  76   :type '(repeat string)
  77   :group 'gnus-picon)
  78
  79 (defcustom gnus-picon-style 'inline
  80   "How should picons be displayed.
  81 If `inline', the textual representation is replaced.  If `right', picons are
  82 added right to the textual representation."
  83   ;; FIXME: `right' needs improvement for XEmacs.
  84   :type '(choice (const inline)
  85                  (const right))
  86   :group 'gnus-picon)
  87
  88 (defface gnus-picon-xbm '((t (:foreground "black" :background "white")))
  89   "Face to show xbm picon in."
  90   :group 'gnus-picon)
  91 ;; backward-compatibility alias
  92 (put 'gnus-picon-xbm-face 'face-alias 'gnus-picon-xbm)
  93
  94 (defface gnus-picon '((t (:foreground "black" :background "white")))
  95   "Face to show picon in."
  96   :group 'gnus-picon)
  97 ;; backward-compatibility alias
  98 (put 'gnus-picon-face 'face-alias 'gnus-picon)
  99
 100 ;;; Internal variables:
 101
 102 (defvar gnus-picon-setup-p nil)
 103 (defvar gnus-picon-glyph-alist nil
 104   "Picon glyphs cache.
 105 List of pairs (KEY . GLYPH) where KEY is either a filename or an URL.")
 106 (defvar gnus-picon-cache nil)
 107
 108 ;;; Functions:
 109
 110 (defsubst gnus-picon-split-address (address)
 111   (setq address (split-string address "@"))
 112   (if (stringp (cadr address))
 113       (cons (car address) (split-string (cadr address) "\\."))
 114     (if (stringp (car address))
 115         (split-string (car address) "\\."))))
 116
 117 (defun gnus-picon-find-face (address directories &optional exact)
 118   (let* ((address (gnus-picon-split-address address))
 119          (user (pop address))
 120          (faddress address)
 121          database directory result instance base)
 122     (catch 'found
 123       (dolist (database gnus-picon-databases)
 124         (dolist (directory directories)
 125           (setq address faddress
 126                 base (expand-file-name directory database))
 127           (while address
 128             (when (setq result (gnus-picon-find-image
 129                                 (concat base "/" (mapconcat 'downcase
 130                                                             (reverse address)
 131                                                             "/")
 132                                         "/" (downcase user) "/")))
 133               (throw 'found result))
 134             (if exact
 135                 (setq address nil)
 136               (pop address)))
 137           ;; Kludge to search MISC as well.  But not in "news".
 138           (unless (string= directory "news")
 139             (when (setq result (gnus-picon-find-image
 140                                 (concat base "/MISC/" user "/")))
 141               (throw 'found result))))))))
 142
 143 (defun gnus-picon-find-image (directory)
 144   (let ((types gnus-picon-file-types)
 145         found type file)
 146     (while (and (not found)
 147                 (setq type (pop types)))
 148       (setq found (file-exists-p (setq file (concat directory "face." type)))))
 149     (if found
 150         file
 151       nil)))
 152
 153 (defun gnus-picon-insert-glyph (glyph category &optional nostring)
 154   "Insert GLYPH into the buffer.
 155 GLYPH can be either a glyph or a string.  When NOSTRING, no textual
 156 replacement is added."
 157   ;; Using NOSTRING prevents wrong BBDB entries with `gnus-picon-style' set to
 158   ;; 'right.
 159   (if (stringp glyph)
 160       (insert glyph)
 161     (gnus-add-wash-type category)
 162     (gnus-add-image category (car glyph))
 163     (gnus-put-image (car glyph) (unless nostring (cdr glyph)) category)))
 164
 165 (defun gnus-picon-create-glyph (file)
 166   (or (cdr (assoc file gnus-picon-glyph-alist))
 167       (cdar (push (cons file (gnus-create-image file))
 168                   gnus-picon-glyph-alist))))
 169
 170 ;;; Functions that does picon transformations:
 171
 172 (declare-function image-size "image.c" (spec &optional pixels frame))
 173
 174 (defun gnus-picon-transform-address (header category)
 175   (gnus-with-article-headers
 176    (let ((addresses
 177           (mail-header-parse-addresses
 178            ;; mail-header-parse-addresses does not work (reliably) on
 179            ;; decoded headers.
 180            (or
 181             (ignore-errors
 182              (mail-encode-encoded-word-string
 183               (or (mail-fetch-field header) "")))
 184             (mail-fetch-field header))))
 185          spec file point cache len)
 186      (dolist (address addresses)
 187        (setq address (car address))
 188        (when (and (stringp address)
 189                   (setq spec (gnus-picon-split-address address)))
 190          (if (setq cache (cdr (assoc address gnus-picon-cache)))
 191              (setq spec cache)
 192            (when (setq file (or (gnus-picon-find-face
 193                                  address gnus-picon-user-directories)
 194                                 (gnus-picon-find-face
 195                                  (concat "unknown@"
 196                                          (mapconcat
 197                                           'identity (cdr spec) "."))
 198                                  gnus-picon-user-directories)))
 199              (setcar spec (cons (gnus-picon-create-glyph file)
 200                                 (car spec))))
 201
 202            (dotimes (i (1- (length spec)))
 203              (when (setq file (gnus-picon-find-face
 204                                (concat "unknown@"
 205                                        (mapconcat
 206                                         'identity (nthcdr (1+ i) spec) "."))
 207                                gnus-picon-domain-directories t))
 208                (setcar (nthcdr (1+ i) spec)
 209                        (cons (gnus-picon-create-glyph file)
 210                              (nth (1+ i) spec)))))
 211            (setq spec (nreverse spec))
 212            (push (cons address spec) gnus-picon-cache))
 213
 214          (gnus-article-goto-header header)
 215          (mail-header-narrow-to-field)
 216          (case gnus-picon-style
 217                (right
 218                 (when (= (length addresses) 1)
 219                   (setq len (apply '+ (mapcar (lambda (x)
 220                                                 (condition-case nil
 221                                                     (car (image-size (car x)))
 222                                                   (error 0))) spec)))
 223                   (when (> len 0)
 224                     (goto-char (point-at-eol))
 225                     (insert (propertize
 226                              " " 'display
 227                              (cons 'space
 228                                    (list :align-to (- (window-width) 1 len))))))
 229                   (goto-char (point-at-eol))
 230                   (setq point (point-at-eol))
 231                   (dolist (image spec)
 232                     (unless (stringp image)
 233                       (goto-char point)
 234                       (gnus-picon-insert-glyph image category 'nostring)))))
 235                (inline
 236                  (when (search-forward address nil t)
 237                    (delete-region (match-beginning 0) (match-end 0))
 238                    (setq point (point))
 239                    (while spec
 240                      (goto-char point)
 241                      (if (> (length spec) 2)
 242                          (insert ".")
 243                        (if (= (length spec) 2)
 244                            (insert "@")))
 245                      (gnus-picon-insert-glyph (pop spec) category))))))))))
 246
 247 (defun gnus-picon-transform-newsgroups (header)
 248   (interactive)
 249   (gnus-with-article-headers
 250    (gnus-article-goto-header header)
 251    (mail-header-narrow-to-field)
 252    (let ((groups (message-tokenize-header (mail-fetch-field header)))
 253          spec file point)
 254      (dolist (group groups)
 255        (unless (setq spec (cdr (assoc group gnus-picon-cache)))
 256          (setq spec (nreverse (split-string group "[.]")))
 257          (dotimes (i (length spec))
 258            (when (setq file (gnus-picon-find-face
 259                              (concat "unknown@"
 260                                      (mapconcat
 261                                       'identity (nthcdr i spec) "."))
 262                              gnus-picon-news-directories t))
 263              (setcar (nthcdr i spec)
 264                      (cons (gnus-picon-create-glyph file)
 265                            (nth i spec)))))
 266          (push (cons group spec) gnus-picon-cache))
 267        (when (search-forward group nil t)
 268          (delete-region (match-beginning 0) (match-end 0))
 269          (save-restriction
 270            (narrow-to-region (point) (point))
 271            (while spec
 272              (goto-char (point-min))
 273              (if (> (length spec) 1)
 274                  (insert "."))
 275              (gnus-picon-insert-glyph (pop spec) 'newsgroups-picon))
 276            (goto-char (point-max))))))))
 277
 278 ;;; Commands:
 279
 280 ;; #### NOTE: the test for buffer-read-only is the same as in
 281 ;; article-display-[x-]face. See the comment up there.
 282
 283 ;;;###autoload
 284 (defun gnus-treat-from-picon ()
 285   "Display picons in the From header.
 286 If picons are already displayed, remove them."
 287   (interactive)
 288   (let ((wash-picon-p buffer-read-only))
 289     (gnus-with-article-buffer
 290      (if (and wash-picon-p (memq 'from-picon gnus-article-wash-types))
 291          (gnus-delete-images 'from-picon)
 292        (gnus-picon-transform-address "from" 'from-picon)))))
 293
 294 ;;;###autoload
 295 (defun gnus-treat-mail-picon ()
 296   "Display picons in the Cc and To headers.
 297 If picons are already displayed, remove them."
 298   (interactive)
 299   (let ((wash-picon-p buffer-read-only))
 300     (gnus-with-article-buffer
 301      (if (and wash-picon-p (memq 'mail-picon gnus-article-wash-types))
 302          (gnus-delete-images 'mail-picon)
 303        (gnus-picon-transform-address "cc" 'mail-picon)
 304        (gnus-picon-transform-address "to" 'mail-picon)))))
 305
 306 ;;;###autoload
 307 (defun gnus-treat-newsgroups-picon ()
 308   "Display picons in the Newsgroups and Followup-To headers.
 309 If picons are already displayed, remove them."
 310   (interactive)
 311   (let ((wash-picon-p buffer-read-only))
 312     (gnus-with-article-buffer
 313      (if (and wash-picon-p (memq 'newsgroups-picon gnus-article-wash-types))
 314          (gnus-delete-images 'newsgroups-picon)
 315        (gnus-picon-transform-newsgroups "newsgroups")
 316        (gnus-picon-transform-newsgroups "followup-to")))))
 317
 318 (provide 'gnus-picon)
 319
 320 ;; arch-tag: fe9aede0-1b1b-463a-b4ab-807f98bcb31f
 321 ;;; gnus-picon.el ends here