lisp/gnus/gnus-picon.el

   1 ;;; gnus-picon.el --- displaying pretty icons in Gnus
   2
   3 ;; Copyright (C) 1996-2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; Keywords: news xpm annotation glyph faces
   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 ;; There are three picon types relevant to Gnus:
  26 ;;
  27 ;; Persons: person@subdomain.dom
  28 ;;          users/dom/subdomain/person/face.gif
  29 ;;          usenix/dom/subdomain/person/face.gif
  30 ;;          misc/MISC/person/face.gif
  31 ;; Domains: subdomain.dom
  32 ;;          domain/dom/subdomain/unknown/face.gif
  33 ;; Groups:  comp.lang.lisp
  34 ;;          news/comp/lang/lisp/unknown/face.gif
  35 ;;
  36 ;; Original implementation by Wes Hardaker <hardaker@ece.ucdavis.edu>.
  37 ;;
  38 ;;; Code:
  39
  40 (eval-when-compile (require 'cl))
  41
  42 (require 'gnus)
  43 (require 'gnus-art)
  44
  45 ;;; User variables:
  46
  47 (defcustom gnus-picon-news-directories '("news")
  48   "*List of directories to search for newsgroups faces."
  49   :type '(repeat string)
  50   :group 'gnus-picon)
  51
  52 (defcustom gnus-picon-user-directories '("users" "usenix" "local" "misc")
  53   "*List of directories to search for user faces."
  54   :type '(repeat string)
  55   :group 'gnus-picon)
  56
  57 (defcustom gnus-picon-domain-directories '("domains")
  58   "*List of directories to search for domain faces.
  59 Some people may want to add \"unknown\" to this list."
  60   :type '(repeat string)
  61   :group 'gnus-picon)
  62
  63 (defcustom gnus-picon-file-types
  64   (let ((types (list "xbm")))
  65     (when (gnus-image-type-available-p 'gif)
  66       (push "gif" types))
  67     (when (gnus-image-type-available-p 'xpm)
  68       (push "xpm" types))
  69     types)
  70   "*List of suffixes on picon file names to try."
  71   :type '(repeat string)
  72   :group 'gnus-picon)
  73
  74 (defcustom gnus-picon-properties '(:color-symbols (("None" . "white")))
  75   "List of image properties applied to picons."
  76   :type 'sexp
  77   :version "24.3"
  78   :group 'gnus-picon)
  79
  80 (defcustom gnus-picon-style 'inline
  81   "How should picons be displayed.
  82 If `inline', the textual representation is replaced.  If `right', picons are
  83 added right to the textual representation."
  84   ;; FIXME: `right' needs improvement for XEmacs.
  85   :type '(choice (const inline)
  86                  (const right))
  87   :group 'gnus-picon)
  88
  89 (defcustom gnus-picon-inhibit-top-level-domains t
  90   "If non-nil, don't piconify top-level domains.
  91 These are often not very interesting."
  92   :version "24.1"
  93   :type 'boolean
  94   :group 'gnus-picon)
  95
  96 ;;; Internal variables:
  97
  98 (defvar gnus-picon-glyph-alist nil
  99   "Picon glyphs cache.
 100 List of pairs (KEY . GLYPH) where KEY is either a filename or an URL.")
 101 (defvar gnus-picon-cache nil)
 102
 103 ;;; Functions:
 104
 105 (defsubst gnus-picon-split-address (address)
 106   (setq address (split-string address "@"))
 107   (if (stringp (cadr address))
 108       (cons (car address) (split-string (cadr address) "\\."))
 109     (if (stringp (car address))
 110         (split-string (car address) "\\."))))
 111
 112 (defun gnus-picon-find-face (address directories &optional exact)
 113   (let* ((address (gnus-picon-split-address address))
 114          (user (pop address))
 115          (faddress address)
 116          database directory result instance base)
 117     (catch 'found
 118       (dolist (database gnus-picon-databases)
 119         (dolist (directory directories)
 120           (setq address faddress
 121                 base (expand-file-name directory database))
 122           (while address
 123             (when (setq result (gnus-picon-find-image
 124                                 (concat base "/" (mapconcat 'downcase
 125                                                             (reverse address)
 126                                                             "/")
 127                                         "/" (downcase user) "/")))
 128               (throw 'found result))
 129             (if exact
 130                 (setq address nil)
 131               (pop address)))
 132           ;; Kludge to search MISC as well.  But not in "news".
 133           (unless (string= directory "news")
 134             (when (setq result (gnus-picon-find-image
 135                                 (concat base "/MISC/" user "/")))
 136               (throw 'found result))))))))
 137
 138 (defun gnus-picon-find-image (directory)
 139   (let ((types gnus-picon-file-types)
 140         found type file)
 141     (while (and (not found)
 142                 (setq type (pop types)))
 143       (setq found (file-exists-p (setq file (concat directory "face." type)))))
 144     (if found
 145         file
 146       nil)))
 147
 148 (defun gnus-picon-insert-glyph (glyph category &optional nostring)
 149   "Insert GLYPH into the buffer.
 150 GLYPH can be either a glyph or a string.  When NOSTRING, no textual
 151 replacement is added."
 152   ;; Using NOSTRING prevents wrong BBDB entries with `gnus-picon-style' set to
 153   ;; 'right.
 154   (if (stringp glyph)
 155       (insert glyph)
 156     (gnus-add-wash-type category)
 157     (gnus-add-image category (car glyph))
 158     (gnus-put-image (car glyph) (unless nostring (cdr glyph)) category)))
 159
 160 (defun gnus-picon-create-glyph (file)
 161   (or (cdr (assoc file gnus-picon-glyph-alist))
 162       (cdar (push (cons file (apply 'gnus-create-image
 163                                     file nil nil
 164                                     gnus-picon-properties))
 165                   gnus-picon-glyph-alist))))
 166
 167 ;;; Functions that does picon transformations:
 168
 169 (declare-function image-size "image.c" (spec &optional pixels frame))
 170
 171 (defun gnus-picon-transform-address (header category)
 172   (gnus-with-article-headers
 173    (let ((addresses
 174           (mail-header-parse-addresses
 175            ;; mail-header-parse-addresses does not work (reliably) on
 176            ;; decoded headers.
 177            (or
 178             (ignore-errors
 179              (mail-encode-encoded-word-string
 180               (or (mail-fetch-field header) "")))
 181             (mail-fetch-field header))))
 182          spec file point cache len)
 183      (dolist (address addresses)
 184        (setq address (car address))
 185        (when (and (stringp address)
 186                   (setq spec (gnus-picon-split-address address)))
 187          (if (setq cache (cdr (assoc address gnus-picon-cache)))
 188              (setq spec cache)
 189            (when (setq file (or (gnus-picon-find-face
 190                                  address gnus-picon-user-directories)
 191                                 (gnus-picon-find-face
 192                                  (concat "unknown@"
 193                                          (mapconcat
 194                                           'identity (cdr spec) "."))
 195                                  gnus-picon-user-directories)))
 196              (setcar spec (cons (gnus-picon-create-glyph file)
 197                                 (car spec))))
 198
 199            (dotimes (i (- (length spec)
 200                           (if gnus-picon-inhibit-top-level-domains
 201                               2 1)))
 202              (when (setq file (gnus-picon-find-face
 203                                (concat "unknown@"
 204                                        (mapconcat
 205                                         'identity (nthcdr (1+ i) spec) "."))
 206                                gnus-picon-domain-directories t))
 207                (setcar (nthcdr (1+ i) spec)
 208                        (cons (gnus-picon-create-glyph file)
 209                              (nth (1+ i) spec)))))
 210            (setq spec (nreverse spec))
 211            (push (cons address spec) gnus-picon-cache))
 212
 213          (gnus-article-goto-header header)
 214          (mail-header-narrow-to-field)
 215          (case gnus-picon-style
 216                (right
 217                 (when (= (length addresses) 1)
 218                   (setq len (apply '+ (mapcar (lambda (x)
 219                                                 (condition-case nil
 220                                                     (car (image-size (car x)))
 221                                                   (error 0))) spec)))
 222                   (when (> len 0)
 223                     (goto-char (point-at-eol))
 224                     (insert (propertize
 225                              " " 'display
 226                              (cons 'space
 227                                    (list :align-to (- (window-width) 1 len))))))
 228                   (goto-char (point-at-eol))
 229                   (setq point (point-at-eol))
 230                   (dolist (image spec)
 231                     (unless (stringp image)
 232                       (goto-char point)
 233                       (gnus-picon-insert-glyph image category 'nostring)))))
 234                (inline
 235                  (when (search-forward address nil t)
 236                    (delete-region (match-beginning 0) (match-end 0))
 237                    (setq point (point))
 238                    (while spec
 239                      (goto-char point)
 240                      (if (> (length spec) 2)
 241                          (insert ".")
 242                        (if (= (length spec) 2)
 243                            (insert "@")))
 244                      (gnus-picon-insert-glyph (pop spec) category))))))))))
 245
 246 (defun gnus-picon-transform-newsgroups (header)
 247   (interactive)
 248   (gnus-with-article-headers
 249    (gnus-article-goto-header header)
 250    (mail-header-narrow-to-field)
 251    (let ((groups (message-tokenize-header (mail-fetch-field header)))
 252          spec file point)
 253      (dolist (group groups)
 254        (unless (setq spec (cdr (assoc group gnus-picon-cache)))
 255          (setq spec (nreverse (split-string group "[.]")))
 256          (dotimes (i (length spec))
 257            (when (setq file (gnus-picon-find-face
 258                              (concat "unknown@"
 259                                      (mapconcat
 260                                       'identity (nthcdr i spec) "."))
 261                              gnus-picon-news-directories t))
 262              (setcar (nthcdr i spec)
 263                      (cons (gnus-picon-create-glyph file)
 264                            (nth i spec)))))
 265          (push (cons group spec) gnus-picon-cache))
 266        (when (search-forward group nil t)
 267          (delete-region (match-beginning 0) (match-end 0))
 268          (save-restriction
 269            (narrow-to-region (point) (point))
 270            (while spec
 271              (goto-char (point-min))
 272              (if (> (length spec) 1)
 273                  (insert "."))
 274              (gnus-picon-insert-glyph (pop spec) 'newsgroups-picon))
 275            (goto-char (point-max))))))))
 276
 277 ;;; Commands:
 278
 279 ;; #### NOTE: the test for buffer-read-only is the same as in
 280 ;; article-display-[x-]face. See the comment up there.
 281
 282 ;;;###autoload
 283 (defun gnus-treat-from-picon ()
 284   "Display picons in the From header.
 285 If picons are already displayed, remove them."
 286   (interactive)
 287   (let ((wash-picon-p buffer-read-only))
 288     (gnus-with-article-buffer
 289      (if (and wash-picon-p (memq 'from-picon gnus-article-wash-types))
 290          (gnus-delete-images 'from-picon)
 291        (gnus-picon-transform-address "from" 'from-picon)))))
 292
 293 ;;;###autoload
 294 (defun gnus-treat-mail-picon ()
 295   "Display picons in the Cc and To headers.
 296 If picons are already displayed, remove them."
 297   (interactive)
 298   (let ((wash-picon-p buffer-read-only))
 299     (gnus-with-article-buffer
 300      (if (and wash-picon-p (memq 'mail-picon gnus-article-wash-types))
 301          (gnus-delete-images 'mail-picon)
 302        (gnus-picon-transform-address "cc" 'mail-picon)
 303        (gnus-picon-transform-address "to" 'mail-picon)))))
 304
 305 ;;;###autoload
 306 (defun gnus-treat-newsgroups-picon ()
 307   "Display picons in the Newsgroups and Followup-To headers.
 308 If picons are already displayed, remove them."
 309   (interactive)
 310   (let ((wash-picon-p buffer-read-only))
 311     (gnus-with-article-buffer
 312      (if (and wash-picon-p (memq 'newsgroups-picon gnus-article-wash-types))
 313          (gnus-delete-images 'newsgroups-picon)
 314        (gnus-picon-transform-newsgroups "newsgroups")
 315        (gnus-picon-transform-newsgroups "followup-to")))))
 316
 317 (provide 'gnus-picon)
 318
 319 ;;; gnus-picon.el ends here