lisp/gnus/mm-archive.el

   1 ;;; mm-archive.el --- Functions for parsing archive files as MIME
   2
   3 ;; Copyright (C) 2012-2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; This file is part of GNU Emacs.
   7
   8 ;; GNU Emacs is free software: you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation, either version 3 of the License, or
  11 ;; (at your option) any later version.
  12
  13 ;; GNU Emacs is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 ;;; Commentary:
  22
  23 ;;; Code:
  24
  25 (require 'mm-decode)
  26 (eval-when-compile
  27   (autoload 'gnus-recursive-directory-files "gnus-util")
  28   (autoload 'mailcap-extension-to-mime "mailcap"))
  29
  30 (defvar mm-archive-decoders
  31   '(("application/ms-tnef" t "tnef" "-f" "-" "-C")
  32     ("application/zip" nil "unzip" "-j" "-x" "%f" "-d")
  33     ("application/x-gtar-compressed" nil "tar" "xzf" "-" "-C")
  34     ("application/x-tar" nil "tar" "xf" "-" "-C")))
  35
  36 (defun mm-archive-decoders () mm-archive-decoders)
  37
  38 (defun mm-dissect-archive (handle)
  39   (let ((decoder (cddr (assoc (car (mm-handle-type handle))
  40                               mm-archive-decoders)))
  41         (dir (mm-make-temp-file
  42               (expand-file-name "emm." mm-tmp-directory) 'dir)))
  43     (set-file-modes dir #o700)
  44     (unwind-protect
  45         (progn
  46           (mm-with-unibyte-buffer
  47             (mm-insert-part handle)
  48             (if (member "%f" decoder)
  49                 (let ((file (expand-file-name "mail.zip" dir)))
  50                   (write-region (point-min) (point-max) file nil 'silent)
  51                   (setq decoder (copy-sequence decoder))
  52                   (setcar (member "%f" decoder) file)
  53                   (apply 'call-process (car decoder) nil nil nil
  54                          (append (cdr decoder) (list dir)))
  55                   (delete-file file))
  56               (apply 'call-process-region (point-min) (point-max) (car decoder)
  57                      nil (get-buffer-create "*tnef*")
  58                      nil (append (cdr decoder) (list dir)))))
  59           `("multipart/mixed"
  60             ,handle
  61             ,@(mm-archive-list-files (gnus-recursive-directory-files dir))))
  62       (delete-directory dir t))))
  63
  64 (defun mm-archive-list-files (files)
  65   (let ((handles nil)
  66         type disposition)
  67     (dolist (file files)
  68       (with-temp-buffer
  69         (when (string-match "\\.\\([^.]+\\)$" file)
  70           (setq type (mailcap-extension-to-mime (match-string 1 file))))
  71         (unless type
  72           (setq type "application/octet-stream"))
  73         (setq disposition
  74               (if (string-match "^image/\\|^text/" type)
  75                   "inline"
  76                 "attachment"))
  77         (insert (format "Content-type: %s\n" type))
  78         (insert "Content-Transfer-Encoding: 8bit\n\n")
  79         (insert-file-contents file)
  80         (push
  81          (mm-make-handle (mm-copy-to-buffer)
  82                          (list type)
  83                          '8bit nil
  84                          `(,disposition (filename . ,file))
  85                          nil nil nil)
  86          handles)))
  87     handles))
  88
  89 (defun mm-archive-dissect-and-inline (handle)
  90   (let ((start (point-marker)))
  91     (save-restriction
  92       (narrow-to-region (point) (point))
  93       (dolist (handle (cddr (mm-dissect-archive handle)))
  94         (goto-char (point-max))
  95         (mm-display-inline handle))
  96       (goto-char (point-max))
  97       (mm-handle-set-undisplayer
  98        handle
  99        `(lambda ()
 100           (let ((inhibit-read-only t)
 101                 (end ,(point-marker)))
 102             (remove-images ,start end)
 103             (delete-region ,start end)))))))
 104
 105 (provide 'mm-archive)
 106
 107 ;; mm-archive.el ends here