lisp/gnus/mm-extern.el

   1 ;;; mm-extern.el --- showing message/external-body
   2
   3 ;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
   5
   6 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
   7 ;; Keywords: message external-body
   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 ;;; Code:
  27
  28 ;; For Emacs < 22.2.
  29 (eval-and-compile
  30   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  31
  32 (eval-when-compile (require 'cl))
  33
  34 (require 'mm-util)
  35 (require 'mm-decode)
  36 (require 'mm-url)
  37
  38 (defvar gnus-article-mime-handles)
  39
  40 (defvar mm-extern-function-alist
  41   '((local-file . mm-extern-local-file)
  42     (url . mm-extern-url)
  43     (anon-ftp . mm-extern-anon-ftp)
  44     (ftp . mm-extern-ftp)
  45 ;;;     (tftp . mm-extern-tftp)
  46     (mail-server . mm-extern-mail-server)
  47 ;;;     (afs . mm-extern-afs))
  48     ))
  49
  50 (defvar mm-extern-anonymous "anonymous")
  51
  52 (defun mm-extern-local-file (handle)
  53   (erase-buffer)
  54   (let ((name (cdr (assq 'name (cdr (mm-handle-type handle)))))
  55         (coding-system-for-read mm-binary-coding-system))
  56     (unless name
  57       (error "The filename is not specified"))
  58     (mm-disable-multibyte)
  59     (if (file-exists-p name)
  60         (mm-insert-file-contents name nil nil nil nil t)
  61       (error "File %s is gone" name))))
  62
  63 (defun mm-extern-url (handle)
  64   (erase-buffer)
  65   (let ((url (cdr (assq 'url (cdr (mm-handle-type handle)))))
  66         (name buffer-file-name)
  67         (coding-system-for-read mm-binary-coding-system))
  68     (unless url
  69       (error "URL is not specified"))
  70     (mm-with-unibyte-current-buffer
  71       (mm-url-insert-file-contents url))
  72     (mm-disable-multibyte)
  73     (setq buffer-file-name name)))
  74
  75 (defun mm-extern-anon-ftp (handle)
  76   (erase-buffer)
  77   (let* ((params (cdr (mm-handle-type handle)))
  78          (name (cdr (assq 'name params)))
  79          (site (cdr (assq 'site params)))
  80          (directory (cdr (assq 'directory params)))
  81          (mode (cdr (assq 'mode params)))
  82          (path (concat "/" (or mm-extern-anonymous
  83                                (read-string (format "ID for %s: " site)))
  84                        "@" site ":" directory "/" name))
  85          (coding-system-for-read mm-binary-coding-system))
  86     (unless name
  87       (error "The filename is not specified"))
  88     (mm-disable-multibyte)
  89     (mm-insert-file-contents path nil nil nil nil t)))
  90
  91 (defun mm-extern-ftp (handle)
  92   (let (mm-extern-anonymous)
  93     (mm-extern-anon-ftp handle)))
  94
  95 (declare-function message-goto-body "message" (&optional interactivep))
  96
  97 (defun mm-extern-mail-server (handle)
  98   (require 'message)
  99   (let* ((params (cdr (mm-handle-type handle)))
 100          (server (cdr (assq 'server params)))
 101          (subject (or (cdr (assq 'subject params)) "none"))
 102          (buf (current-buffer))
 103          info)
 104     (if (y-or-n-p (format "Send a request message to %s? " server))
 105         (save-window-excursion
 106           (message-mail server subject)
 107           (message-goto-body)
 108           (delete-region (point) (point-max))
 109           (insert-buffer-substring buf)
 110           (message "Requesting external body...")
 111           (message-send-and-exit)
 112           (setq info "Request is sent.")
 113           (message info))
 114       (setq info "Request is not sent."))
 115     (goto-char (point-min))
 116     (insert "[" info "]\n\n")))
 117
 118 ;;;###autoload
 119 (defun mm-extern-cache-contents (handle)
 120   "Put the external-body part of HANDLE into its cache."
 121   (let* ((access-type (cdr (assq 'access-type
 122                                  (cdr (mm-handle-type handle)))))
 123          (func (cdr (assq (intern
 124                            (downcase
 125                             (or access-type
 126                                 (error "Couldn't find access type"))))
 127                           mm-extern-function-alist)))
 128          buf handles)
 129     (unless func
 130       (error "Access type (%s) is not supported" access-type))
 131     (mm-with-part handle
 132       (goto-char (point-max))
 133       (insert "\n\n")
 134       ;; It should be just a single MIME handle.
 135       (setq handles (mm-dissect-buffer t)))
 136     (unless (bufferp (car handles))
 137       (mm-destroy-parts handles)
 138       (error "Multipart external body is not supported"))
 139     (save-excursion
 140       (set-buffer (setq buf (mm-handle-buffer handles)))
 141       (let (good)
 142         (unwind-protect
 143             (progn
 144               (funcall func handle)
 145               (setq good t))
 146           (unless good
 147             (mm-destroy-parts handles))))
 148       (mm-handle-set-cache handle handles))
 149     (setq gnus-article-mime-handles
 150           (mm-merge-handles gnus-article-mime-handles handles))))
 151
 152 ;;;###autoload
 153 (defun mm-inline-external-body (handle &optional no-display)
 154   "Show the external-body part of HANDLE.
 155 This function replaces the buffer of HANDLE with a buffer contains
 156 the entire message.
 157 If NO-DISPLAY is nil, display it. Otherwise, do nothing after replacing."
 158   (unless (mm-handle-cache handle)
 159     (mm-extern-cache-contents handle))
 160   (unless no-display
 161     (save-excursion
 162       (save-restriction
 163         (narrow-to-region (point) (point))
 164         (mm-display-part (mm-handle-cache handle))))
 165     ;; Move undisplayer added to the cached handle to the parent.
 166     (mm-handle-set-undisplayer
 167      handle (mm-handle-undisplayer (mm-handle-cache handle)))
 168     (mm-handle-set-undisplayer (mm-handle-cache handle) nil)))
 169
 170 (provide 'mm-extern)
 171
 172 ;; arch-tag: 9653808e-14d9-4172-86e6-adceaa05378e
 173 ;;; mm-extern.el ends here