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-;;; nndb.el --- nndb access for Gnus
-
-;; Copyright (C) 1997, 1998, 2000, 2002, 2003, 2004, 2005, 2006, 2007,
-;; 2008, 2009, 2010 Free Software Foundation, Inc.
-
-;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
-;; Kai Grossjohann <grossjohann@ls6.informatik.uni-dortmund.de>
-;; Joe Hildebrand <joe.hildebrand@ilg.com>
-;; David Blacka <davidb@rwhois.net>
-;; Keywords: news
-
-;; This file is part of GNU Emacs.
-
-;; GNU Emacs is free software: you can redistribute it and/or modify
-;; it under the terms of the GNU General Public License as published by
-;; the Free Software Foundation, either version 3 of the License, or
-;; (at your option) any later version.
-
-;; GNU Emacs is distributed in the hope that it will be useful,
-;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-;; GNU General Public License for more details.
-
-;; You should have received a copy of the GNU General Public License
-;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-
-;;; This was based upon Kai Grossjohan's shamessly snarfed code and
-;;; further modified by Joe Hildebrand. It has been updated for Red
-;;; Gnus.
-
-;; TODO:
-;;
-;; * Fix bug where server connection can be lost and impossible to regain
-;; This hasn't happened to me in a while; think it was fixed in Rgnus
-;;
-;; * make it handle different nndb servers seemlessly
-;;
-;; * Optimize expire if FORCE
-;;
-;; * Optimize move (only expire once)
-;;
-;; * Deal with add/deletion of groups
-;;
-;; * make the backend TOUCH an article when marked as expireable (will
-;; make article expire 'expiry' days after that moment).
-
-;;; Code:
-
-;; For Emacs < 22.2.
-(eval-and-compile
- (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
-
-;;-
-;; Register nndb with known select methods.
-
-(require 'gnus-start)
-(unless (assoc "nndb" gnus-valid-select-methods)
- (gnus-declare-backend "nndb" 'mail 'respool 'address 'prompt-address))
-
-(require 'nnmail)
-(require 'nnheader)
-(require 'nntp)
-(eval-when-compile (require 'cl))
-
-;; Declare nndb as derived from nntp
-
-(nnoo-declare nndb nntp)
-
-;; Variables specific to nndb
-
-;;- currently not used but just in case...
-(defvoo nndb-deliver-program "nndel"
- "*The program used to put a message in an NNDB group.")
-
-(defvoo nndb-server-side-expiry nil
- "If t, expiry calculation will occur on the server side.")
-
-(defvoo nndb-set-expire-date-on-mark nil
- "If t, the expiry date for a given article will be set to the time
-it was marked as expireable; otherwise the date will be the time the
-article was posted to nndb")
-
-;; Variables copied from nntp
-
-(defvoo nndb-server-opened-hook '(nntp-send-authinfo-from-file)
- "Like nntp-server-opened-hook."
- nntp-server-opened-hook)
-
-(defvoo nndb-address "localhost"
- "*The name of the NNDB server."
- nntp-address)
-
-(defvoo nndb-port-number 9000
- "*Port number to connect to."
- nntp-port-number)
-
-;; change to 'news if you are actually using nndb for news
-(defvoo nndb-article-type 'mail)
-
-(defvoo nndb-status-string nil "" nntp-status-string)
-
-
-
-(defconst nndb-version "nndb 0.7"
- "Version numbers of this version of NNDB.")
-
-
-;;; Interface functions.
-
-(nnoo-define-basics nndb)
-
-;;------------------------------------------------------------------
-
-;; this function turns the lisp list into a string list. There is
-;; probably a more efficient way to do this.
-(defun nndb-build-article-string (articles)
- (let (art-string art)
- (while articles
- (setq art (pop articles))
- (setq art-string (concat art-string art " ")))
- art-string))
-
-(defun nndb-build-expire-rest-list (total expire)
- (let (art rest)
- (while total
- (setq art (pop total))
- (if (memq art expire)
- ()
- (push art rest)))
- rest))
-
-
-;;
-(deffoo nndb-request-type (group &optional article)
- nndb-article-type)
-
-;; nndb-request-update-info does not exist and is not needed
-
-;; nndb-request-update-mark does not exist; it should be used to TOUCH
-;; articles as they are marked exipirable
-(defun nndb-touch-article (group article)
- (nntp-send-command nil "X-TOUCH" article))
-
-(deffoo nndb-request-update-mark
- (group article mark)
- "Sets the expiry date for ARTICLE in GROUP to now, if the mark is 'E'"
- (if (and nndb-set-expire-date-on-mark (string-equal mark "E"))
- (nndb-touch-article group article))
- mark)
-
-;; nndb-request-create-group -- currently this isn't necessary; nndb
-;; creates groups on demand.
-
-;; todo -- use some other time than the creation time of the article
-;; best is time since article has been marked as expirable
-
-(defun nndb-request-expire-articles-local
- (articles &optional group server force)
- "Let gnus do the date check and issue the delete commands."
- (let (msg art delete-list (num-delete 0) rest)
- (nntp-possibly-change-group group server)
- (while articles
- (setq art (pop articles))
- (nntp-send-command "^\\([23]\\|^423\\).*\n" "X-DATE" art)
- (setq msg (nndb-status-message))
- (if (string-match "^423" msg)
- ()
- (or (string-match "'\\(.+\\)'" msg)
- (error "Not a valid response for X-DATE command: %s"
- msg))
- (if (nnmail-expired-article-p
- group
- (date-to-time (substring msg (match-beginning 1) (match-end 1)))
- force)
- (progn
- (setq delete-list (concat delete-list " " (int-to-string art)))
- (setq num-delete (1+ num-delete)))
- (push art rest))))
- (if (> (length delete-list) 0)
- (progn
- (nnheader-message 5 "Deleting %s article(s) from %s"
- (int-to-string num-delete) group)
- (nntp-send-command "^[23].*\n" "X-DELETE" delete-list))
- )
-
- (nnheader-message 5 "")
- (nconc rest articles)))
-
-(defun nndb-get-remote-expire-response ()
- (let (list)
- (set-buffer nntp-server-buffer)
- (goto-char (point-min))
- (if (looking-at "^[34]")
- ;; x-expire returned error--presume no articles were expirable)
- (setq list nil)
- ;; otherwise, pull all of the following numbers into the list
- (re-search-forward "follows\r?\n?" nil t)
- (while (re-search-forward "^[0-9]+$" nil t)
- (push (string-to-number (match-string 0)) list)))
- list))
-
-(defun nndb-request-expire-articles-remote
- (articles &optional group server force)
- "Let the nndb backend expire articles"
- (let (days art-string delete-list (num-delete 0))
- (nntp-possibly-change-group group server)
-
- ;; first calculate the wait period in days
- (setq days (or (and nnmail-expiry-wait-function
- (funcall nnmail-expiry-wait-function group))
- nnmail-expiry-wait))
- ;; now handle the special cases
- (cond (force
- (setq days 0))
- ((eq days 'never)
- ;; This isn't an expirable group.
- (setq days -1))
- ((eq days 'immediate)
- (setq days 0)))
-
-
- ;; build article string
- (setq art-string (concat days " " (nndb-build-article-string articles)))
- (nntp-send-command "^\.\r?\n\\|^[345].*\n" "X-EXPIRE" art-string)
-
- (setq delete-list (nndb-get-remote-expire-response))
- (setq num-delete (length delete-list))
- (if (> num-delete 0)
- (nnheader-message 5 "Deleting %s article(s) from %s"
- (int-to-string num-delete) group))
-
- (nndb-build-expire-rest-list articles delete-list)))
-
-(deffoo nndb-request-expire-articles
- (articles &optional group server force)
- "Expires ARTICLES from GROUP on SERVER.
-If FORCE, delete regardless of exiration date, otherwise use normal
-expiry mechanism."
- (if nndb-server-side-expiry
- (nndb-request-expire-articles-remote articles group server force)
- (nndb-request-expire-articles-local articles group server force)))
-
-;; _Something_ defines it...
-(declare-function nndb-request-article "nndb" t t)
-
-(deffoo nndb-request-move-article
- (article group server accept-form &optional last move-is-internal)
- "Move ARTICLE (a number) from GROUP on SERVER.
-Evals ACCEPT-FORM in current buffer, where the article is.
-Optional LAST is ignored."
- ;; we guess that the second arg in accept-form is the new group,
- ;; which it will be for nndb, which is all that matters anyway
- (let ((new-group (nth 1 accept-form)) result)
- (nntp-possibly-change-group group server)
-
- ;; use the move command for nndb-to-nndb moves
- (if (string-match "^nndb" new-group)
- (let ((new-group-name (gnus-group-real-name new-group)))
- (nntp-send-command "^[23].*\n" "X-MOVE" article new-group-name)
- (cons new-group article))
- ;; else move normally
- (let ((artbuf (get-buffer-create " *nndb move*")))
- (and
- (nndb-request-article article group server artbuf)
- (save-excursion
- (set-buffer artbuf)
- (insert-buffer-substring nntp-server-buffer)
- (setq result (eval accept-form))
- (kill-buffer (current-buffer))
- result)
- (nndb-request-expire-articles (list article)
- group
- server
- t))
- result)
- )))
-
-(deffoo nndb-request-accept-article (group server &optional last)
- "The article in the current buffer is put into GROUP."
- (nntp-possibly-change-group group server)
- (let (art msg)
- (when (nntp-send-command "^[23].*\r?\n" "ACCEPT" group)
- (nnheader-insert "")
- (nntp-send-buffer "^[23].*\n"))
-
- (set-buffer nntp-server-buffer)
- (setq msg (buffer-string))
- (or (string-match "^\\([0-9]+\\)" msg)
- (error "nndb: %s" msg))
- (setq art (substring msg (match-beginning 1) (match-end 1)))
- (nnheader-message 5 "nndb: accepted %s" art)
- (list art)))
-
-(deffoo nndb-request-replace-article (article group buffer)
- "ARTICLE is the number of the article in GROUP to be replaced with the contents of the BUFFER."
- (set-buffer buffer)
- (when (nntp-send-command "^[23].*\r?\n" "X-REPLACE" (int-to-string article))
- (nnheader-insert "")
- (nntp-send-buffer "^[23.*\n")
- (list (int-to-string article))))
-
- ; nndb-request-delete-group does not exist
- ; todo -- maybe later
-
- ; nndb-request-rename-group does not exist
- ; todo -- maybe later
-
-;; -- standard compatibility functions
-
-(deffoo nndb-status-message (&optional server)
- "Return server status as a string."
- (set-buffer nntp-server-buffer)
- (buffer-string))
-
-;; Import stuff from nntp
-
-(nnoo-import nndb
- (nntp))
-
-(provide 'nndb)
-
-;; arch-tag: 83bd6fb4-58d9-4fed-a901-c6c625ad5f8a
-;;; nndb.el ends here
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