lisp/gnus/gnus-move.el

   1 ;;; gnus-move.el --- commands for moving Gnus from one server to another
   2
   3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004,
   4 ;;   2005 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   7 ;; Keywords: news
   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 2, or (at your option)
  14 ;; 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; see the file COPYING.  If not, write to the
  23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  24 ;; Boston, MA 02110-1301, USA.
  25
  26 ;;; Commentary:
  27
  28 ;;; Code:
  29
  30 (eval-when-compile (require 'cl))
  31
  32 (require 'gnus)
  33 (require 'gnus-start)
  34 (require 'gnus-int)
  35 (require 'gnus-range)
  36
  37 ;;;
  38 ;;; Moving by comparing Message-ID's.
  39 ;;;
  40
  41 ;;;###autoload
  42 (defun gnus-change-server (from-server to-server)
  43   "Move from FROM-SERVER to TO-SERVER.
  44 Update the .newsrc.eld file to reflect the change of nntp server."
  45   (interactive
  46    (list gnus-select-method (gnus-read-method "Move to method: ")))
  47
  48   ;; First start Gnus.
  49   (let ((gnus-activate-level 0)
  50         (mail-sources nil)
  51         (nnmail-spool-file nil))
  52     (gnus))
  53
  54   (save-excursion
  55     ;; Go through all groups and translate.
  56     (let ((newsrc gnus-newsrc-alist)
  57           (nntp-nov-gap nil)
  58           info)
  59       (while (setq info (pop newsrc))
  60         (when (gnus-group-native-p (gnus-info-group info))
  61           (gnus-move-group-to-server info from-server to-server))))))
  62
  63 (defun gnus-move-group-to-server (info from-server to-server)
  64   "Move group INFO from FROM-SERVER to TO-SERVER."
  65   (let ((group (gnus-info-group info))
  66         to-active hashtb type mark marks
  67         to-article to-reads to-marks article
  68         act-articles)
  69     (gnus-message 7 "Translating %s..." group)
  70     (when (gnus-request-group group nil to-server)
  71       (setq to-active (gnus-parse-active)
  72             hashtb (gnus-make-hashtable 1024)
  73             act-articles (gnus-uncompress-range to-active))
  74       ;; Fetch the headers from the `to-server'.
  75       (when (and to-active
  76                  act-articles
  77                  (setq type (gnus-retrieve-headers
  78                              act-articles
  79                              group to-server)))
  80         ;; Convert HEAD headers.  I don't care.
  81         (when (eq type 'headers)
  82           (nnvirtual-convert-headers))
  83         ;; Create a mapping from Message-ID to article number.
  84         (set-buffer nntp-server-buffer)
  85         (goto-char (point-min))
  86         (while (looking-at
  87                 "^[0-9]+\t[^\t]*\t[^\t]*\t[^\t]*\t\\([^\t]*\\)\t")
  88           (gnus-sethash
  89            (buffer-substring (match-beginning 1) (match-end 1))
  90            (read (current-buffer))
  91            hashtb)
  92           (forward-line 1))
  93         ;; Then we read the headers from the `from-server'.
  94         (when (and (gnus-request-group group nil from-server)
  95                    (gnus-active group)
  96                    (gnus-uncompress-range
  97                     (gnus-active group))
  98                    (setq type (gnus-retrieve-headers
  99                                (gnus-uncompress-range
 100                                 (gnus-active group))
 101                                group from-server)))
 102           ;; Make it easier to map marks.
 103           (let ((mark-lists (gnus-info-marks info))
 104                 ms type m)
 105             (while mark-lists
 106               (setq type (caar mark-lists)
 107                     ms (gnus-uncompress-range (cdr (pop mark-lists))))
 108               (while ms
 109                 (if (setq m (assq (car ms) marks))
 110                     (setcdr m (cons type (cdr m)))
 111                   (push (list (car ms) type) marks))
 112                 (pop ms))))
 113           ;; Convert.
 114           (when (eq type 'headers)
 115             (nnvirtual-convert-headers))
 116           ;; Go through the headers and map away.
 117           (set-buffer nntp-server-buffer)
 118           (goto-char (point-min))
 119           (while (looking-at
 120                   "^[0-9]+\t[^\t]*\t[^\t]*\t[^\t]*\t\\([^\t]*\\)\t")
 121             (when (setq to-article
 122                         (gnus-gethash
 123                          (buffer-substring (match-beginning 1) (match-end 1))
 124                          hashtb))
 125               ;; Add this article to the list of read articles.
 126               (push to-article to-reads)
 127               ;; See if there are any marks and then add them.
 128               (when (setq mark (assq (read (current-buffer)) marks))
 129                 (setq marks (delq mark marks))
 130                 (setcar mark to-article)
 131                 (push mark to-marks))
 132               (forward-line 1)))
 133           ;; Now we know what the read articles are and what the
 134           ;; article marks are.  We transform the information
 135           ;; into the Gnus info format.
 136           (setq to-reads
 137                 (gnus-range-add
 138                  (gnus-compress-sequence
 139                   (and (setq to-reads (delq nil to-reads))
 140                        (sort to-reads '<))
 141                   t)
 142                  (cons 1 (1- (car to-active)))))
 143           (gnus-info-set-read info to-reads)
 144           ;; Do the marks.  I'm sure y'all understand what's
 145           ;; going on down below, so I won't bother with any
 146           ;; further comments.  <duck>
 147           (let ((mlists gnus-article-mark-lists)
 148                 lists ms a)
 149             (while mlists
 150               (push (list (cdr (pop mlists))) lists))
 151             (while (setq ms (pop marks))
 152               (setq article (pop ms))
 153               (while ms
 154                 (setcdr (setq a (assq (pop ms) lists))
 155                         (cons article (cdr a)))))
 156             (setq a lists)
 157             (while a
 158               (setcdr (car a) (gnus-compress-sequence
 159                                (and (cdar a) (sort (cdar a) '<))))
 160               (pop a))
 161             (gnus-info-set-marks info lists t)))))
 162     (gnus-message 7 "Translating %s...done" group)))
 163
 164 (defun gnus-group-move-group-to-server (info from-server to-server)
 165   "Move the group on the current line from FROM-SERVER to TO-SERVER."
 166   (interactive
 167    (let ((info (gnus-get-info (gnus-group-group-name))))
 168      (list info (gnus-find-method-for-group (gnus-info-group info))
 169            (gnus-read-method (format "Move group %s to method: "
 170                                      (gnus-info-group info))))))
 171   (save-excursion
 172     (gnus-move-group-to-server info from-server to-server)
 173     ;; We have to update the group info to point use the right server.
 174     (gnus-info-set-method info to-server t)
 175     ;; We also have to change the name of the group and stuff.
 176     (let* ((group (gnus-info-group info))
 177            (new-name (gnus-group-prefixed-name
 178                       (gnus-group-real-name group) to-server)))
 179       (gnus-info-set-group info new-name)
 180       (gnus-sethash new-name (gnus-gethash group gnus-newsrc-hashtb)
 181                     gnus-newsrc-hashtb)
 182       (gnus-sethash group nil gnus-newsrc-hashtb))))
 183
 184 (provide 'gnus-move)
 185
 186 ;;; arch-tag: 503742b8-7d66-4d79-bb31-4a698070707b
 187 ;;; gnus-move.el ends here