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, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007, 2008 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 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 (eval-when-compile (require 'cl))
  29
  30 (require 'gnus)
  31 (require 'gnus-start)
  32 (require 'gnus-int)
  33 (require 'gnus-range)
  34
  35 ;;;
  36 ;;; Moving by comparing Message-ID's.
  37 ;;;
  38
  39 ;;;###autoload
  40 (defun gnus-change-server (from-server to-server)
  41   "Move from FROM-SERVER to TO-SERVER.
  42 Update the .newsrc.eld file to reflect the change of nntp server."
  43   (interactive
  44    (list gnus-select-method (gnus-read-method "Move to method: ")))
  45
  46   ;; First start Gnus.
  47   (let ((gnus-activate-level 0)
  48         (mail-sources nil))
  49     (gnus))
  50
  51   (save-excursion
  52     ;; Go through all groups and translate.
  53     (let ((nntp-nov-gap nil))
  54       (dolist (info gnus-newsrc-alist)
  55         (when (gnus-group-native-p (gnus-info-group info))
  56           (gnus-move-group-to-server info from-server to-server))))))
  57
  58 (defun gnus-move-group-to-server (info from-server to-server)
  59   "Move group INFO from FROM-SERVER to TO-SERVER."
  60   (let ((group (gnus-info-group info))
  61         to-active hashtb type mark marks
  62         to-article to-reads to-marks article
  63         act-articles)
  64     (gnus-message 7 "Translating %s..." group)
  65     (when (gnus-request-group group nil to-server)
  66       (setq to-active (gnus-parse-active)
  67             hashtb (gnus-make-hashtable 1024)
  68             act-articles (gnus-uncompress-range to-active))
  69       ;; Fetch the headers from the `to-server'.
  70       (when (and to-active
  71                  act-articles
  72                  (setq type (gnus-retrieve-headers
  73                              act-articles
  74                              group to-server)))
  75         ;; Convert HEAD headers.  I don't care.
  76         (when (eq type 'headers)
  77           (nnvirtual-convert-headers))
  78         ;; Create a mapping from Message-ID to article number.
  79         (set-buffer nntp-server-buffer)
  80         (goto-char (point-min))
  81         (while (looking-at
  82                 "^[0-9]+\t[^\t]*\t[^\t]*\t[^\t]*\t\\([^\t]*\\)\t")
  83           (gnus-sethash
  84            (buffer-substring (match-beginning 1) (match-end 1))
  85            (read (current-buffer))
  86            hashtb)
  87           (forward-line 1))
  88         ;; Then we read the headers from the `from-server'.
  89         (when (and (gnus-request-group group nil from-server)
  90                    (gnus-active group)
  91                    (gnus-uncompress-range
  92                     (gnus-active group))
  93                    (setq type (gnus-retrieve-headers
  94                                (gnus-uncompress-range
  95                                 (gnus-active group))
  96                                group from-server)))
  97           ;; Make it easier to map marks.
  98           (let ((mark-lists (gnus-info-marks info))
  99                 ms type m)
 100             (while mark-lists
 101               (setq type (caar mark-lists)
 102                     ms (gnus-uncompress-range (cdr (pop mark-lists))))
 103               (while ms
 104                 (if (setq m (assq (car ms) marks))
 105                     (setcdr m (cons type (cdr m)))
 106                   (push (list (car ms) type) marks))
 107                 (pop ms))))
 108           ;; Convert.
 109           (when (eq type 'headers)
 110             (nnvirtual-convert-headers))
 111           ;; Go through the headers and map away.
 112           (set-buffer nntp-server-buffer)
 113           (goto-char (point-min))
 114           (while (looking-at
 115                   "^[0-9]+\t[^\t]*\t[^\t]*\t[^\t]*\t\\([^\t]*\\)\t")
 116             (when (setq to-article
 117                         (gnus-gethash
 118                          (buffer-substring (match-beginning 1) (match-end 1))
 119                          hashtb))
 120               ;; Add this article to the list of read articles.
 121               (push to-article to-reads)
 122               ;; See if there are any marks and then add them.
 123               (when (setq mark (assq (read (current-buffer)) marks))
 124                 (setq marks (delq mark marks))
 125                 (setcar mark to-article)
 126                 (push mark to-marks))
 127               (forward-line 1)))
 128           ;; Now we know what the read articles are and what the
 129           ;; article marks are.  We transform the information
 130           ;; into the Gnus info format.
 131           (setq to-reads
 132                 (gnus-range-add
 133                  (gnus-compress-sequence
 134                   (and (setq to-reads (delq nil to-reads))
 135                        (sort to-reads '<))
 136                   t)
 137                  (cons 1 (1- (car to-active)))))
 138           (gnus-info-set-read info to-reads)
 139           ;; Do the marks.  I'm sure y'all understand what's
 140           ;; going on down below, so I won't bother with any
 141           ;; further comments.  <duck>
 142           (let ((mlists gnus-article-mark-lists)
 143                 lists ms a)
 144             (while mlists
 145               (push (list (cdr (pop mlists))) lists))
 146             (while (setq ms (pop marks))
 147               (setq article (pop ms))
 148               (while ms
 149                 (setcdr (setq a (assq (pop ms) lists))
 150                         (cons article (cdr a)))))
 151             (setq a lists)
 152             (while a
 153               (setcdr (car a) (gnus-compress-sequence
 154                                (and (cdar a) (sort (cdar a) '<))))
 155               (pop a))
 156             (gnus-info-set-marks info lists t)))))
 157     (gnus-message 7 "Translating %s...done" group)))
 158
 159 (defun gnus-group-move-group-to-server (info from-server to-server)
 160   "Move the group on the current line from FROM-SERVER to TO-SERVER."
 161   (interactive
 162    (let ((info (gnus-get-info (gnus-group-group-name))))
 163      (list info (gnus-find-method-for-group (gnus-info-group info))
 164            (gnus-read-method (format "Move group %s to method: "
 165                                      (gnus-info-group info))))))
 166   (save-excursion
 167     (gnus-move-group-to-server info from-server to-server)
 168     ;; We have to update the group info to point use the right server.
 169     (gnus-info-set-method info to-server t)
 170     ;; We also have to change the name of the group and stuff.
 171     (let* ((group (gnus-info-group info))
 172            (new-name (gnus-group-prefixed-name
 173                       (gnus-group-real-name group) to-server)))
 174       (gnus-info-set-group info new-name)
 175       (gnus-sethash new-name (gnus-group-entry group) gnus-newsrc-hashtb)
 176       (gnus-sethash group nil gnus-newsrc-hashtb))))
 177
 178 (provide 'gnus-move)
 179
 180 ;; arch-tag: 503742b8-7d66-4d79-bb31-4a698070707b
 181 ;;; gnus-move.el ends here