elmo/elmo-mime.el

   1 ;;; elmo-mime.el --- MIME module for ELMO.
   2
   3 ;; Copyright (C) 1998,1999,2000 Yuuichi Teranishi <teranisi@gohome.org>
   4
   5 ;; Author: Yuuichi Teranishi <teranisi@gohome.org>
   6 ;; Keywords: mail, net news
   7
   8 ;; This file is part of ELMO (Elisp Library for Message Orchestration).
   9
  10 ;; This program 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 2, or (at your option)
  13 ;; any later version.
  14 ;;
  15 ;; This program 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., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24 ;;
  25
  26 ;;; Commentary:
  27 ;;
  28
  29 ;;; Code:
  30 ;;
  31 (require 'elmo-vars)
  32 (require 'mmbuffer)
  33 (require 'mmimap)
  34 (require 'mime-view)
  35
  36 (eval-and-compile
  37   (luna-define-class mime-elmo-buffer-entity (mime-buffer-entity) ())
  38   (luna-define-class mime-elmo-imap-entity (mime-imap-entity) ()))
  39
  40 ;; Provide backend
  41 (provide 'mmelmo-imap)
  42 (provide 'mmelmo-buffer)
  43
  44 (defvar elmo-message-ignored-field-list mime-view-ignored-field-list)
  45 (defvar elmo-message-visible-field-list mime-view-visible-field-list)
  46 (defvar elmo-message-sorted-field-list nil)
  47
  48 (defcustom elmo-mime-header-max-column fill-column
  49   "*Header max column number. Default is `fill-colmn'.
  50 If a symbol of function is specified, the function is called and its return
  51 value is used."
  52   :type '(choice (integer :tag "Column Number")
  53                  (function :tag "Function"))
  54   :group 'elmo)
  55
  56 (defcustom elmo-mime-display-as-is-coding-system (if (boundp 'MULE)
  57                                                      '*autoconv* 'undecided)
  58   "*Coding system used when message is displayed as is."
  59   :type 'symbol
  60   :group 'elmo)
  61
  62 (luna-define-method initialize-instance :after ((entity mime-elmo-buffer-entity)
  63                                                 &rest init-args)
  64   entity)
  65
  66 (luna-define-method initialize-instance :around ((entity mime-elmo-imap-entity)
  67                                                  &rest init-args)
  68   (luna-call-next-method))
  69
  70 ;;; Insert sorted header.
  71 (defsubst elmo-mime-insert-header-from-buffer (buffer
  72                                                start end
  73                                                &optional invisible-fields
  74                                                visible-fields
  75                                                sort-fields)
  76   (let ((the-buf (current-buffer))
  77         (mode-obj (mime-find-field-presentation-method 'wide))
  78         field-decoder
  79         f-b p f-e field-name field field-body
  80         vf-alist (sl sort-fields))
  81     (save-excursion
  82       (set-buffer buffer)
  83       (save-restriction
  84         (narrow-to-region start end)
  85         (goto-char start)
  86         (while (re-search-forward std11-field-head-regexp nil t)
  87           (setq f-b (match-beginning 0)
  88                 p (match-end 0)
  89                 field-name (buffer-substring f-b p)
  90                 f-e (std11-field-end))
  91           (when (mime-visible-field-p field-name
  92                                       visible-fields invisible-fields)
  93             (setq field (intern
  94                          (capitalize (buffer-substring f-b (1- p))))
  95                   field-body (buffer-substring p f-e)
  96                   field-decoder (inline (mime-find-field-decoder-internal
  97                                          field mode-obj)))
  98             (setq vf-alist (append (list
  99                                     (cons field-name
 100                                           (list field-body field-decoder)))
 101                                    vf-alist))))
 102         (and vf-alist
 103              (setq vf-alist
 104                    (sort vf-alist
 105                          (function (lambda (s d)
 106                                      (let ((n 0) re
 107                                            (sf (car s))
 108                                            (df (car d)))
 109                                        (catch 'done
 110                                          (while (setq re (nth n sl))
 111                                            (setq n (1+ n))
 112                                            (and (string-match re sf)
 113                                                 (throw 'done t))
 114                                            (and (string-match re df)
 115                                                 (throw 'done nil)))
 116                                          t)))))))
 117         (with-current-buffer the-buf
 118           (while vf-alist
 119             (let* ((vf (car vf-alist))
 120                    (field-name (car vf))
 121                    (field-body (car (cdr vf)))
 122                    (field-decoder (car (cdr (cdr vf)))))
 123               (insert field-name)
 124               (insert (if field-decoder
 125                           (funcall field-decoder field-body
 126                                    (string-width field-name)
 127                                    (if (functionp elmo-mime-header-max-column)
 128                                        (funcall elmo-mime-header-max-column)
 129                                      elmo-mime-header-max-column))
 130                         ;; Don't decode
 131                         field-body))
 132               (insert "\n"))
 133             (setq vf-alist (cdr vf-alist)))
 134           (run-hooks 'mmelmo-header-inserted-hook))))))
 135
 136 (luna-define-generic elmo-mime-insert-sorted-header (entity
 137                                                      &optional invisible-fields
 138                                                      visible-fields
 139                                                      sorted-fields)
 140   "Insert sorted header fields of the ENTITY.")
 141
 142 (luna-define-method elmo-mime-insert-sorted-header ((entity
 143                                                      mime-elmo-buffer-entity)
 144                                                     &optional invisible-fields
 145                                                     visible-fields
 146                                                     sorted-fields)
 147   (elmo-mime-insert-header-from-buffer
 148    (mime-buffer-entity-buffer-internal entity)
 149    (mime-buffer-entity-header-start-internal entity)
 150    (mime-buffer-entity-header-end-internal entity)
 151    invisible-fields visible-fields sorted-fields))
 152
 153 (luna-define-method elmo-mime-insert-sorted-header ((entity
 154                                                      mime-elmo-imap-entity)
 155                                                     &optional invisible-fields
 156                                                     visible-fields
 157                                                     sorted-fields)
 158   (let ((the-buf (current-buffer))
 159         buf p-min p-max)
 160     (with-temp-buffer
 161       (insert (mime-imap-entity-header-string entity))
 162       (setq buf (current-buffer)
 163             p-min (point-min)
 164             p-max (point-max))
 165       (set-buffer the-buf)
 166       (elmo-mime-insert-header-from-buffer buf p-min p-max
 167                                            invisible-fields
 168                                            visible-fields
 169                                            sorted-fields))))
 170
 171 (luna-define-method mime-insert-text-content :around
 172   ((entity mime-elmo-buffer-entity))
 173   (luna-call-next-method)
 174   (run-hooks 'elmo-message-text-content-inserted-hook))
 175
 176 (luna-define-method mime-insert-text-content :around
 177   ((entity mime-elmo-imap-entity))
 178   (luna-call-next-method)
 179   (run-hooks 'elmo-message-text-content-inserted-hook))
 180
 181 (defun elmo-mime-insert-header (entity situation)
 182   (elmo-mime-insert-sorted-header
 183    entity
 184    elmo-message-ignored-field-list
 185    elmo-message-visible-field-list
 186    elmo-message-sorted-field-list)
 187   (run-hooks 'elmo-message-header-inserted-hook))
 188
 189 (defun elmo-make-mime-message-location (folder number strategy rawbuf unread)
 190 ;; Return the MIME message location structure.
 191 ;; FOLDER is the ELMO folder structure.
 192 ;; NUMBER is the number of the message in the FOLDER.
 193 ;; STRATEGY is the message fetching strategy.
 194 ;; RAWBUF is the output buffer for original message.
 195 ;; If second optional argument UNREAD is non-nil, message is not marked
 196 ;; as read.
 197   (if (and strategy
 198            (eq (elmo-fetch-strategy-entireness strategy) 'section))
 199       (luna-make-entity
 200        'mime-elmo-imap-location
 201        :folder folder
 202        :number number
 203        :rawbuf rawbuf
 204        :strategy strategy)
 205     (with-current-buffer rawbuf
 206       (let (buffer-read-only)
 207         (erase-buffer)
 208         (if strategy
 209             (elmo-message-fetch folder number strategy
 210                                 nil (current-buffer)
 211                                 unread))))
 212     rawbuf))
 213
 214 (defun elmo-mime-message-display (folder number viewbuf rawbuf original-mode
 215                                          &optional ignore-cache unread keymap)
 216   "Display MIME message.
 217 A message in the FOLDER with NUMBER is displayed on the VIEWBUF using RAWBUF.
 218 VIEWBUF is a view buffer and RAWBUF is a raw buffer.
 219 ORIGINAL is the major mode of RAWBUF.
 220 If optional argument IGNORE-CACHE is specified, existing cache is ignored.
 221 If second optional argument UNREAD is specified, message is displayed but
 222 keep it as unread.
 223 Return non-nil if not entire message was fetched."
 224   (let (mime-display-header-hook ; Do nothing.
 225         (elmo-message-displaying t)
 226         entity strategy)
 227     (setq entity (elmo-msgdb-overview-get-entity number
 228                                                  (elmo-folder-msgdb
 229                                                   folder)))
 230     (setq strategy (elmo-find-fetch-strategy folder entity
 231                                              ignore-cache))
 232     (mime-display-message
 233      (mime-open-entity
 234       (if (and strategy
 235                (eq (elmo-fetch-strategy-entireness strategy) 'section))
 236           'elmo-imap
 237         'elmo-buffer)
 238       (elmo-make-mime-message-location
 239        folder number strategy rawbuf unread))
 240      viewbuf nil keymap
 241      original-mode)
 242     (if strategy
 243         (or (elmo-fetch-strategy-use-cache strategy)
 244             (eq (elmo-fetch-strategy-entireness strategy)
 245                 'section)))))
 246
 247 (defun elmo-mime-display-as-is (folder number viewbuf rawbuf original-mode
 248                                        &optional ignore-cache unread keymap)
 249   "Display MIME message.
 250 A message in the FOLDER with NUMBER is displayed on the VIEWBUF using RAWBUF.
 251 VIEWBUF is a view buffer and RAWBUF is a raw buffer.
 252 ORIGINAL is the major mode of RAWBUF.
 253 If optional argument IGNORE-CACHE is specified, existing cache is ignored.
 254 If second optional argument UNREAD is specified, message is displayed but
 255 keep it as unread.
 256 Return non-nil if cache is used."
 257   (let ((entity (elmo-msgdb-overview-get-entity number
 258                                                 (elmo-folder-msgdb folder)))
 259         mime-display-header-hook ; Do nothing.
 260         cache-file strategy use-cache)
 261     (setq cache-file (elmo-file-cache-get
 262                       (elmo-msgdb-overview-entity-get-id entity)))
 263     (setq use-cache (and (elmo-message-use-cache-p folder number)
 264                          (eq (elmo-file-cache-status cache-file) 'entire)))
 265     (setq strategy (elmo-make-fetch-strategy
 266                     'entire use-cache (elmo-message-use-cache-p folder number)
 267                     (elmo-file-cache-path
 268                      cache-file)))
 269     (elmo-mime-display-as-is-internal
 270      (mime-open-entity
 271       'elmo-buffer
 272       (elmo-make-mime-message-location
 273        folder number strategy rawbuf unread))
 274      viewbuf nil keymap original-mode)
 275     (elmo-fetch-strategy-use-cache strategy)))
 276
 277 ;; Replacement of mime-display-message.
 278 (defun elmo-mime-display-as-is-internal (message
 279                                          &optional preview-buffer
 280                                          mother default-keymap-or-function
 281                                          original-major-mode keymap)
 282   (mime-maybe-hide-echo-buffer)
 283   (let ((win-conf (current-window-configuration)))
 284     (or preview-buffer
 285         (setq preview-buffer
 286               (concat "*Preview-" (mime-entity-name message) "*")))
 287     (or original-major-mode
 288         (setq original-major-mode major-mode))
 289     (let ((inhibit-read-only t))
 290       (set-buffer (get-buffer-create preview-buffer))
 291       (widen)
 292       (erase-buffer)
 293       (if mother
 294           (setq mime-mother-buffer mother))
 295       (setq mime-preview-original-window-configuration win-conf)
 296       (setq major-mode 'mime-view-mode)
 297       (setq mode-name "MIME-View")
 298
 299       ;; Humm...
 300       (set-buffer-multibyte nil)
 301       (mime-insert-entity message)
 302       (set-buffer-multibyte t)
 303       (decode-coding-region (point-min) (point-max)
 304                             elmo-mime-display-as-is-coding-system)
 305       (save-restriction
 306         (std11-narrow-to-header)
 307         (run-hooks 'elmo-message-header-inserted-hook))
 308       ;; set original major mode for mime-preview-quit
 309       (put-text-property (point-min) (point-max)
 310                          'mime-view-situation
 311                          `((major-mode . ,original-major-mode)))
 312       (use-local-map
 313        (or keymap
 314            (if default-keymap-or-function
 315                (mime-view-define-keymap default-keymap-or-function)
 316              mime-view-mode-default-map)))
 317       (let ((point
 318              (next-single-property-change (point-min) 'mime-view-entity)))
 319         (if point
 320             (goto-char point)
 321           (goto-char (point-min))
 322           (search-forward "\n\n" nil t)))
 323       (run-hooks 'mime-view-mode-hook)
 324       (set-buffer-modified-p nil)
 325       (setq buffer-read-only t)
 326       preview-buffer)))
 327
 328 (require 'product)
 329 (product-provide (provide 'elmo-mime) (require 'elmo-version))
 330
 331 ;; elmo-mime.el ends here