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[bpt/emacs.git] / lisp / gnus / nnultimate.el

;;; nnultimate.el --- interfacing with the Ultimate Bulletin Board system -*- coding: iso-latin-1 -*-
;; Copyright (C) 1999, 2000 Free Software Foundation, Inc.

;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; 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 2, 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;; Note: You need to have `url' and `w3' installed for this
;; backend to work.

;;; Code:

(eval-when-compile (require 'cl))

(require 'nnoo)
(require 'message)
(require 'gnus-util)
(require 'gnus)
(require 'nnmail)
(require 'mm-util)
(eval-when-compile
  (ignore-errors
    (require 'nnweb)))
;; Report failure to find w3 at load time if appropriate.
(eval '(require 'nnweb))

(nnoo-declare nnultimate)

(defvoo nnultimate-directory (nnheader-concat gnus-directory "ultimate/")
  "Where nnultimate will save its files.")

(defvoo nnultimate-address ""
  "The address of the Ultimate bulletin board.")

;;; Internal variables

(defvar nnultimate-groups-alist nil)
(defvoo nnultimate-groups nil)
(defvoo nnultimate-headers nil)
(defvoo nnultimate-articles nil)

;;; Interface functions

(nnoo-define-basics nnultimate)

(deffoo nnultimate-retrieve-headers (articles &optional group server fetch-old)
  (nnultimate-possibly-change-server group server)
  (unless gnus-nov-is-evil
    (let* ((last (car (last articles)))
	   (did nil)
	   (start 1)
	   (entry (assoc group nnultimate-groups))
	   (sid (nth 2 entry))
	   (topics (nth 4 entry))
	   (mapping (nth 5 entry))
	   (old-total (or (nth 6 entry) 1))
	   (furl "forumdisplay.cgi?action=topics&number=%d&DaysPrune=1000")
	   (furls (list (concat nnultimate-address (format furl sid))))
	   headers article subject score from date lines parent point
	   contents tinfo fetchers map elem a href garticles topic old-max
	   inc datel table string current-page total-contents pages
	   farticles forum-contents parse furl-fetched mmap farticle)
      (setq map mapping)
      (while (and (setq article (car articles))
		  map)
	(while (and map
		    (or (> article (caar map))
			(< (cadar map) (caar map))))
	  (pop map))
	(when (setq mmap (car map))
	  (setq farticle -1)
	  (while (and article
		      (<= article (nth 1 mmap)))
	    ;; Do we already have a fetcher for this topic?
	    (if (setq elem (assq (nth 2 mmap) fetchers))
		;; Yes, so we just add the spec to the end.
		(nconc elem (list (cons article
					(+ (nth 3 mmap) (incf farticle)))))
	      ;; No, so we add a new one.
	      (push (list (nth 2 mmap)
			  (cons article
				(+ (nth 3 mmap) (incf farticle))))
		    fetchers))
	    (pop articles)
	    (setq article (car articles)))))
      ;; Now we have the mapping from/to Gnus/nnultimate article numbers,
      ;; so we start fetching the topics that we need to satisfy the
      ;; request.
      (if (not fetchers)
	  (save-excursion
	    (set-buffer nntp-server-buffer)
	    (erase-buffer))
	(setq nnultimate-articles nil)
	(mm-with-unibyte-buffer
	  (dolist (elem fetchers)
	    (setq pages 1
		  current-page 1
		  total-contents nil)
	    (while (<= current-page pages)
	      (erase-buffer)
	      (setq subject (nth 2 (assq (car elem) topics)))
	      (setq href (nth 3 (assq (car elem) topics)))
	      (if (= current-page 1)
		  (nnweb-insert href)
		(string-match "\\.html$" href)
		(nnweb-insert (concat (substring href 0 (match-beginning 0))
				      "-" (number-to-string current-page)
				      (match-string 0 href))))
	      (goto-char (point-min))
	      (setq contents
		    (ignore-errors (w3-parse-buffer (current-buffer))))
	      (setq table (nnultimate-find-forum-table contents))
	      (setq string (mapconcat 'identity (nnweb-text table) ""))
	      (when (string-match "topic is \\([0-9]\\) pages" string)
		(setq pages (string-to-number (match-string 1 string)))
		(setcdr table nil)
		(setq table (nnultimate-find-forum-table contents)))
	      (setq contents (cdr (nth 2 (car (nth 2 table)))))
	      (setq total-contents (nconc total-contents contents))
	      (incf current-page))
	    ;;(setq total-contents (nreverse total-contents))
	    (dolist (art (cdr elem))
	      (if (not (nth (1- (cdr art)) total-contents))
		  ()			;(debug)
		(push (list (car art)
			    (nth (1- (cdr art)) total-contents)
			    subject)
		      nnultimate-articles)))))
	(setq nnultimate-articles
	      (sort nnultimate-articles 'car-less-than-car))
	;; Now we have all the articles, conveniently in an alist
	;; where the key is the Gnus article number.
	(dolist (articlef nnultimate-articles)
	  (setq article (nth 0 articlef)
		contents (nth 1 articlef)
		subject (nth 2 articlef))
	  (setq from (mapconcat 'identity
				(nnweb-text (car (nth 2 contents)))
				" ")
		datel (nnweb-text (nth 2 (car (cdr (nth 2 contents))))))
	  (while datel
	    (when (string-match "Posted" (car datel))
	      (setq date (substring (car datel) (match-end 0))
		    datel nil))
	    (pop datel))