lisp/mh-e/mh-gnus.el

   1 ;;; mh-gnus.el --- make MH-E compatible with various versions of Gnus
   2
   3 ;; Copyright (C) 2003-2004, 2006-2017 Free Software Foundation, Inc.
   4
   5 ;; Author: Satyaki Das <satyaki@theforce.stanford.edu>
   6 ;; Maintainer: Bill Wohler <wohler@newt.com>
   7 ;; Keywords: mail
   8 ;; See: mh-e.el
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;;; Change Log:
  28
  29 ;;; Code:
  30
  31 (require 'mh-e)
  32
  33 (eval-and-compile
  34   (mh-require 'gnus-util nil t)
  35   (mh-require 'mm-bodies nil t)
  36   (mh-require 'mm-decode nil t)
  37   (mh-require 'mm-view nil t)
  38   (mh-require 'mml nil t))
  39
  40 ;; Copy of function from gnus-util.el.
  41 ;; TODO This is not in Gnus 5.11.
  42 (defun-mh mh-gnus-local-map-property gnus-local-map-property (map)
  43   "Return a list suitable for a text property list specifying keymap MAP."
  44   (cond ((featurep 'xemacs) (list 'keymap map))
  45         ((>= emacs-major-version 21) (list 'keymap map))
  46         (t (list 'local-map map))))
  47
  48 ;; Copy of function from mm-decode.el.
  49 (defun-mh mh-mm-merge-handles mm-merge-handles (handles1 handles2)
  50   (append
  51    (if (listp (car handles1))
  52        handles1
  53      (list handles1))
  54    (if (listp (car handles2))
  55        handles2
  56      (list handles2))))
  57
  58 ;; Copy of function from mm-decode.el.
  59 (defun-mh mh-mm-set-handle-multipart-parameter
  60   mm-set-handle-multipart-parameter (handle parameter value)
  61   ;; HANDLE could be a CTL.
  62   (when handle
  63     (put-text-property 0 (length (car handle)) parameter value
  64                        (car handle))))
  65
  66 ;; Copy of function from mm-view.el.
  67 (defun-mh mh-mm-inline-text-vcard mm-inline-text-vcard (handle)
  68   (let ((inhibit-read-only t))
  69     (mm-insert-inline
  70      handle
  71      (concat "\n-- \n"
  72              (ignore-errors
  73                (if (fboundp 'vcard-pretty-print)
  74                    (vcard-pretty-print (mm-get-part handle))
  75                  (vcard-format-string
  76                   (vcard-parse-string (mm-get-part handle)
  77                                       'vcard-standard-filter))))))))
  78
  79 ;; Function from mm-decode.el used in PGP messages. Just define it with older
  80 ;; Gnus to avoid compiler warning.
  81 (defun-mh mh-mm-possibly-verify-or-decrypt
  82   mm-possibly-verify-or-decrypt (parts ctl)
  83   nil)
  84
  85 ;; Copy of macro in mm-decode.el.
  86 (defmacro-mh mh-mm-handle-multipart-ctl-parameter
  87   mm-handle-multipart-ctl-parameter (handle parameter)
  88   `(get-text-property 0 ,parameter (car ,handle)))
  89
  90 ;; Copy of function in mm-decode.el.
  91 (defun-mh mh-mm-readable-p mm-readable-p (handle)
  92   "Say whether the content of HANDLE is readable."
  93   (and (< (with-current-buffer (mm-handle-buffer handle)
  94             (buffer-size)) 10000)
  95        (mm-with-unibyte-buffer
  96          (mm-insert-part handle)
  97          (and (eq (mm-body-7-or-8) '7bit)
  98               (not (mh-mm-long-lines-p 76))))))
  99
 100 ;; Copy of function in mm-bodies.el.
 101 (defun-mh mh-mm-long-lines-p mm-long-lines-p (length)
 102   "Say whether any of the lines in the buffer is longer than LENGTH."
 103   (save-excursion
 104     (goto-char (point-min))
 105     (end-of-line)
 106     (while (and (not (eobp))
 107                 (not (> (current-column) length)))
 108       (forward-line 1)
 109       (end-of-line))
 110     (and (> (current-column) length)
 111          (current-column))))
 112
 113 (defun-mh mh-mm-keep-viewer-alive-p mm-keep-viewer-alive-p (handle)
 114   ;; Released Gnus doesn't keep handles associated with externally displayed
 115   ;; MIME parts. So this will always return nil.
 116   nil)
 117
 118 (defun-mh mh-mm-destroy-parts mm-destroy-parts (list)
 119   "Older versions of Emacs don't have this function."
 120   nil)
 121
 122 (defun-mh mh-mm-uu-dissect-text-parts mm-uu-dissect-text-parts (handles)
 123   "Emacs 21 and XEmacs don't have this function."
 124   nil)
 125
 126 ;; Copy of function in mml.el.
 127 (defun-mh mh-mml-minibuffer-read-disposition
 128   mml-minibuffer-read-disposition (type &optional default filename)
 129   (unless default
 130     (setq default (mml-content-disposition type filename)))
 131   (let ((disposition (completing-read
 132                       (format "Disposition (default %s): " default)
 133                       '(("attachment") ("inline") (""))
 134                       nil t nil nil default)))
 135     (if (not (equal disposition ""))
 136         disposition
 137       default)))
 138
 139 ;; This is mm-save-part from Gnus 5.11 since that function in Emacs
 140 ;; 21.2 is buggy (the args to read-file-name are incorrect) and the
 141 ;; version in Emacs 22 is not consistent with C-x C-w in that you
 142 ;; can't just specify a directory and have the right thing happen.
 143 (defun mh-mm-save-part (handle &optional prompt)
 144   "Write HANDLE to a file.
 145 PROMPT overrides the default one used to ask user for a file name."
 146   (let ((filename (or (mail-content-type-get
 147                        (mm-handle-disposition handle) 'filename)
 148                       (mail-content-type-get
 149                        (mm-handle-type handle) 'name)))
 150         file)
 151     (when filename
 152       (setq filename (gnus-map-function mm-file-name-rewrite-functions
 153                                         (file-name-nondirectory filename))))
 154     (setq file
 155           (read-file-name (or prompt "Save MIME part to: ")
 156                           (or mm-default-directory default-directory)
 157                           nil nil (or filename "")))
 158     (setq mm-default-directory (file-name-directory file))
 159     (and (or (not (file-exists-p file))
 160              (yes-or-no-p (format "File %s already exists; overwrite? "
 161                                   file)))
 162          (progn
 163            (mm-save-part-to-file handle file)
 164            file))))
 165
 166 (defun mh-mm-text-html-renderer ()
 167   "Find the renderer Gnus is using to display text/html MIME parts."
 168   (or (and (boundp 'mm-inline-text-html-renderer) mm-inline-text-html-renderer)
 169       (and (boundp 'mm-text-html-renderer) mm-text-html-renderer)))
 170
 171 (provide 'mh-gnus)
 172
 173 ;; Local Variables:
 174 ;; no-update-autoloads: t
 175 ;; indent-tabs-mode: nil
 176 ;; sentence-end-double-space: nil
 177 ;; End:
 178
 179 ;;; mh-gnus.el ends here