lisp/gnus/mm-partial.el

   1 ;;; mm-partial.el --- showing message/partial
   2
   3 ;; Copyright (C) 2000-2015 Free Software Foundation, Inc.
   4
   5 ;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
   6 ;; Keywords: message partial
   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 ;;; Code:
  26
  27 (eval-when-compile (require 'cl))
  28
  29 (require 'gnus-sum)
  30 (require 'mm-util)
  31 (require 'mm-decode)
  32
  33 (defun mm-partial-find-parts (id &optional art)
  34   (let ((headers (with-current-buffer gnus-summary-buffer
  35                    gnus-newsgroup-headers))
  36         phandles header)
  37     (while (setq header (pop headers))
  38       (unless (eq (aref header 0) art)
  39         (mm-with-unibyte-buffer
  40           (gnus-request-article-this-buffer (aref header 0)
  41                                             gnus-newsgroup-name)
  42           (when (search-forward id nil t)
  43             (let ((nhandles (mm-dissect-buffer
  44                              nil gnus-article-loose-mime)) nid)
  45               (if (consp (car nhandles))
  46                   (mm-destroy-parts nhandles)
  47                 (setq nid (cdr (assq 'id
  48                                      (cdr (mm-handle-type nhandles)))))
  49                 (if (not (equal id nid))
  50                     (mm-destroy-parts nhandles)
  51                   (push nhandles phandles))))))))
  52     phandles))
  53
  54 ;;;###autoload
  55 (defun mm-inline-partial (handle &optional no-display)
  56   "Show the partial part of HANDLE.
  57 This function replaces the buffer of HANDLE with a buffer contains
  58 the entire message.
  59 If NO-DISPLAY is nil, display it. Otherwise, do nothing after replacing."
  60   (let ((id (cdr (assq 'id (cdr (mm-handle-type handle)))))
  61         phandles
  62         (b (point)) (n 1) total
  63         phandle nn ntotal
  64         gnus-displaying-mime handles buffer)
  65     (unless (mm-handle-cache handle)
  66       (unless id
  67         (error "Can not find message/partial id"))
  68       (setq phandles
  69             (sort (cons handle
  70                         (mm-partial-find-parts
  71                          id
  72                          (with-current-buffer gnus-summary-buffer
  73                            (gnus-summary-article-number))))
  74                   #'(lambda (a b)
  75                       (let ((anumber (string-to-number
  76                                       (cdr (assq 'number
  77                                                  (cdr (mm-handle-type a))))))
  78                             (bnumber (string-to-number
  79                                       (cdr (assq 'number
  80                                                  (cdr (mm-handle-type b)))))))
  81                         (< anumber bnumber)))))
  82       (setq gnus-article-mime-handles
  83             (mm-merge-handles gnus-article-mime-handles phandles))
  84       (with-current-buffer (generate-new-buffer " *mm*")
  85         (while (setq phandle (pop phandles))
  86           (setq nn (string-to-number
  87                     (cdr (assq 'number
  88                                (cdr (mm-handle-type phandle))))))
  89           (setq ntotal (string-to-number
  90                         (cdr (assq 'total
  91                                    (cdr (mm-handle-type phandle))))))
  92           (if ntotal
  93               (if total
  94                   (unless (eq total ntotal)
  95                   (error "The numbers of total are different"))
  96                 (setq total ntotal)))
  97           (unless (< nn n)
  98             (unless (eq nn n)
  99               (error "Missing part %d" n))
 100             (mm-insert-part phandle)
 101             (goto-char (point-max))
 102             (when (not (eq 0 (skip-chars-backward "\r\n")))
 103               ;; remove tail blank spaces except one
 104               (if (looking-at "\r?\n")
 105                   (goto-char (match-end 0)))
 106               (delete-region (point) (point-max)))
 107             (setq n (+ n 1))))
 108         (unless total
 109           (error "Don't known the total number of"))
 110         (if (<= n total)
 111             (error "Missing part %d" n))
 112         (kill-buffer (mm-handle-buffer handle))
 113         (goto-char (point-min))
 114         (let ((point (if (search-forward "\n\n" nil t)
 115                          (1- (point))
 116                        (point-max))))
 117           (goto-char (point-min))
 118           (unless (re-search-forward "^mime-version:" point t)
 119             (insert "MIME-Version: 1.0\n")))
 120         (setcar handle (current-buffer))
 121         (mm-handle-set-cache handle t)))
 122     (unless no-display
 123       (save-excursion
 124         (save-restriction
 125           (narrow-to-region b b)
 126           (mm-insert-part handle)
 127           (let (gnus-article-mime-handles)
 128             (run-hooks 'gnus-article-decode-hook)
 129             (gnus-article-prepare-display)
 130             (setq handles gnus-article-mime-handles))
 131           (when handles
 132             ;; It is in article buffer.
 133             (setq gnus-article-mime-handles
 134                   (mm-merge-handles gnus-article-mime-handles handles)))
 135           (mm-handle-set-undisplayer
 136            handle
 137            `(lambda ()
 138               (let (buffer-read-only)
 139                 (condition-case nil
 140                     ;; This is only valid on XEmacs.
 141                     (mapcar (lambda (prop)
 142                             (remove-specifier
 143                              (face-property 'default prop) (current-buffer)))
 144                             '(background background-pixmap foreground))
 145                   (error nil))
 146                 (delete-region ,(point-min-marker) ,(point-max-marker))))))))))
 147
 148 (provide 'mm-partial)
 149
 150 ;;; mm-partial.el ends here