--- /dev/null
+;;; nnwfm.el --- interfacing with a web forum
+;; Copyright (C) 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 nnwfm)
+
+(defvoo nnwfm-directory (nnheader-concat gnus-directory "wfm/")
+ "Where nnwfm will save its files.")
+
+(defvoo nnwfm-address ""
+ "The address of the Ultimate bulletin board.")
+
+;;; Internal variables
+
+(defvar nnwfm-groups-alist nil)
+(defvoo nnwfm-groups nil)
+(defvoo nnwfm-headers nil)
+(defvoo nnwfm-articles nil)
+(defvar nnwfm-table-regexp
+ "postings.*editpost\\|forumdisplay\\|Forum[0-9]+/HTML\\|getbio")
+
+;;; Interface functions
+
+(nnoo-define-basics nnwfm)
+
+(deffoo nnwfm-retrieve-headers (articles &optional group server fetch-old)
+ (nnwfm-possibly-change-server group server)
+ (unless gnus-nov-is-evil
+ (let* ((last (car (last articles)))
+ (did nil)
+ (start 1)
+ (entry (assoc group nnwfm-groups))
+ (sid (nth 2 entry))
+ (topics (nth 4 entry))
+ (mapping (nth 5 entry))
+ (old-total (or (nth 6 entry) 1))
+ (nnwfm-table-regexp "Thread.asp")
+ 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
+ thread-id tables hstuff bstuff time)
+ (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/nnwfm 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 nnwfm-articles nil)
+ (mm-with-unibyte-buffer
+ (dolist (elem fetchers)
+ (erase-buffer)
+ (setq subject (nth 2 (assq (car elem) topics))
+ thread-id (nth 0 (assq (car elem) topics)))
+ (nnweb-insert
+ (concat nnwfm-address
+ (format "Item.asp?GroupID=%d&ThreadID=%d" sid
+ thread-id)))
+ (goto-char (point-min))
+ (setq contents
+ (ignore-errors (w3-parse-buffer (current-buffer))))
+ (setq tables (caddar (caddar (cdr (caddar (caddar contents))))))
+ (setq tables (cdr (caddar (memq (assq 'div tables) tables))))
+ (setq contents nil)
+ (dolist (table tables)
+ (setq table (caddar (caddar (caddr table)))
+ hstuff (delete ":link" (nnweb-text (car table)))
+ bstuff (car (caddar (cdr table)))
+ from (car hstuff))
+ (when (nth 2 hstuff)
+ (setq time (nnwfm-date-to-time (nth 2 hstuff)))
+ (push (list from time bstuff) contents)))
+ (setq contents (nreverse contents))
+ (dolist (art (cdr elem))
+ (push (list (car art)
+ (nth (1- (cdr art)) contents)
+ subject)
+ nnwfm-articles))))
+ (setq nnwfm-articles
+ (sort nnwfm-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 nnwfm-articles)
+ (setq article (nth 0 articlef)
+ contents (nth 1 articlef)
+ subject (nth 2 articlef))
+ (setq from (nth 0 contents)
+ date (message-make-date (nth 1 contents)))
+ (push
+ (cons
+ article
+ (make-full-mail-header
+ article subject
+ from (or date "")
+ (concat "<" (number-to-string sid) "%"
+ (number-to-string article)
+ "@wfm>")
+ "" 0
+ (/ (length (mapconcat 'identity (nnweb-text (nth 2 contents)) ""))
+ 70)
+ nil nil))
+ headers))
+ (setq nnwfm-headers (sort headers 'car-less-than-car))
+ (save-excursion
+ (set-buffer nntp-server-buffer)
+ (mm-with-unibyte-current-buffer
+ (erase-buffer)
+ (dolist (header nnwfm-headers)
+ (nnheader-insert-nov (cdr header))))))
+ 'nov)))
+
+(deffoo nnwfm-request-group (group &optional server dont-check)
+ (nnwfm-possibly-change-server nil server)
+ (when (not nnwfm-groups)
+ (nnwfm-request-list))
+ (unless dont-check
+ (nnwfm-create-mapping group))
+ (let ((elem (assoc group nnwfm-groups)))
+ (cond
+ ((not elem)
+ (nnheader-report 'nnwfm "Group does not exist"))
+ (t
+ (nnheader-report 'nnwfm "Opened group %s" group)
+ (nnheader-insert
+ "211 %d %d %d %s\n" (cadr elem) 1 (cadr elem)
+ (prin1-to-string group))))))
+
+(deffoo nnwfm-request-close ()
+ (setq nnwfm-groups-alist nil
+ nnwfm-groups nil))
+
+(deffoo nnwfm-request-article (article &optional group server buffer)
+ (nnwfm-possibly-change-server group server)
+ (let ((contents (cdr (assq article nnwfm-articles))))
+ (when (setq contents (nth 2 (car contents)))
+ (save-excursion
+ (set-buffer (or buffer nntp-server-buffer))
+ (erase-buffer)
+ (nnweb-insert-html contents)
+ (goto-char (point-min))
+ (insert "Content-Type: text/html\nMIME-Version: 1.0\n")
+ (let ((header (cdr (assq article nnwfm-headers))))
+ (mm-with-unibyte-current-buffer
+ (nnheader-insert-header header)))
+ (nnheader-report 'nnwfm "Fetched article %s" article)
+ (cons group article)))))
+
+(deffoo nnwfm-request-list (&optional server)
+ (nnwfm-possibly-change-server nil server)
+ (mm-with-unibyte-buffer
+ (nnweb-insert
+ (if (string-match "/$" nnwfm-address)
+ (concat nnwfm-address "Group.asp")
+ nnwfm-address))
+ (let* ((nnwfm-table-regexp "Thread.asp")
+ (contents (w3-parse-buffer (current-buffer)))
+ sid elem description articles a href group forum
+ a1 a2)
+ (dolist (row (cdr (nth 2 (car (nth 2 (nnwfm-find-forum-table
+ contents))))))
+ (setq row (nth 2 row))
+ (when (setq a (nnweb-parse-find 'a row))
+ (setq group (car (last (nnweb-text a)))
+ href (cdr (assq 'href (nth 1 a))))
+ (setq description (car (last (nnweb-text (nth 1 row)))))
+ (setq articles
+ (string-to-number
+ (nnweb-replace-in-string
+ (car (last (nnweb-text (nth 3 row)))) "," "")))
+ (when (and href
+ (string-match "GroupId=\\([0-9]+\\)" href))
+ (setq forum (string-to-number (match-string 1 href)))
+ (if (setq elem (assoc group nnwfm-groups))
+ (setcar (cdr elem) articles)
+ (push (list group articles forum description nil nil nil nil)
+ nnwfm-groups))))))
+ (nnwfm-write-groups)
+ (nnwfm-generate-active)
+ t))
+
+(deffoo nnwfm-request-newgroups (date &optional server)
+ (nnwfm-possibly-change-server nil server)
+ (nnwfm-generate-active)
+ t)
+
+(nnoo-define-skeleton nnwfm)
+
+;;; Internal functions
+
+(defun nnwfm-new-threads-p (group time)
+ "See whether we want to fetch the threads for GROUP written before TIME."
+ (let ((old-time (nth 7 (assoc group nnwfm-groups))))
+ (or (null old-time)
+ (time-less-p old-time time))))
+
+(defun nnwfm-create-mapping (group)
+ (let* ((entry (assoc group nnwfm-groups))
+ (sid (nth 2 entry))
+ (topics (nth 4 entry))
+ (mapping (nth 5 entry))
+ (old-total (or (nth 6 entry) 1))
+ (current-time (current-time))
+ (nnwfm-table-regexp "Thread.asp")
+ (furls (list (concat nnwfm-address
+ (format "Thread.asp?GroupId=%d" sid))))
+ fetched-urls
+ contents forum-contents a subject href
+ garticles topic tinfo old-max inc parse elem date
+ url time)
+ (mm-with-unibyte-buffer
+ (while furls
+ (erase-buffer)
+ (push (car furls) fetched-urls)
+ (nnweb-insert (pop furls))
+ (goto-char (point-min))
+ (while (re-search-forward " wr(" nil t)
+ (forward-char -1)
+ (setq elem (message-tokenize-header
+ (buffer-substring
+ (1+ (point))
+ (progn
+ (forward-sexp 1)
+ (1- (point))))))
+ (push (list
+ (string-to-number (nth 1 elem))
+ (nnweb-replace-in-string (nth 2 elem) "\"" "")
+ (string-to-number (nth 5 elem)))
+ forum-contents))
+ (when (re-search-forward "href=\"\\(Thread.*DateLast=\\([^\"]+\\)\\)"
+ nil t)
+ (setq url (match-string 1)
+ time (nnwfm-date-to-time (url-unhex-string (match-string 2))))
+ (when (and (nnwfm-new-threads-p group time)
+ (not (member
+ (setq url (concat
+ nnwfm-address
+ (nnweb-decode-entities-string url)))
+ fetched-urls)))
+ (push url furls))))
+ ;; The main idea here is to map Gnus article numbers to
+ ;; nnwfm article numbers. Say there are three topics in
+ ;; this forum, the first with 4 articles, the seconds with 2,
+ ;; and the third with 1. Then this will translate into 7 Gnus
+ ;; article numbers, where 1-4 comes from the first topic, 5-6
+ ;; from the second and 7 from the third. Now, then next time
+ ;; the group is entered, there's 2 new articles in topic one
+ ;; and 1 in topic three. Then Gnus article number 8-9 be 5-6
+ ;; in topic one and 10 will be the 2 in topic three.
+ (dolist (elem (nreverse forum-contents))
+ (setq subject (nth 1 elem)
+ topic (nth 0 elem)
+ garticles (nth 2 elem))
+ (if (setq tinfo (assq topic topics))
+ (progn
+ (setq old-max (cadr tinfo))
+ (setcar (cdr tinfo) garticles))
+ (setq old-max 0)
+ (push (list topic garticles subject) topics)
+ (setcar (nthcdr 4 entry) topics))
+ (when (not (= old-max garticles))
+ (setq inc (- garticles old-max))
+ (setq mapping (nconc mapping
+ (list
+ (list
+ old-total (1- (incf old-total inc))
+ topic (1+ old-max)))))
+ (incf old-max inc)
+ (setcar (nthcdr 5 entry) mapping)
+ (setcar (nthcdr 6 entry) old-total))))
+ (setcar (nthcdr 7 entry) current-time)
+ (setcar (nthcdr 1 entry) (1- old-total))
+ (nnwfm-write-groups)
+ mapping))
+
+(defun nnwfm-possibly-change-server (&optional group server)
+ (nnwfm-init server)
+ (when (and server
+ (not (nnwfm-server-opened server)))
+ (nnwfm-open-server server))
+ (unless nnwfm-groups-alist
+ (nnwfm-read-groups)
+ (setq nnwfm-groups (cdr (assoc nnwfm-address
+ nnwfm-groups-alist)))))
+
+(deffoo nnwfm-open-server (server &optional defs connectionless)
+ (nnheader-init-server-buffer)
+ (if (nnwfm-server-opened server)
+ t
+ (unless (assq 'nnwfm-address defs)
+ (setq defs (append defs (list (list 'nnwfm-address server)))))
+ (nnoo-change-server 'nnwfm server defs)))
+
+(defun nnwfm-read-groups ()
+ (setq nnwfm-groups-alist nil)
+ (let ((file (expand-file-name "groups" nnwfm-directory)))
+ (when (file-exists-p file)
+ (mm-with-unibyte-buffer
+ (insert-file-contents file)
+ (goto-char (point-min))
+ (setq nnwfm-groups-alist (read (current-buffer)))))))
+
+(defun nnwfm-write-groups ()
+ (setq nnwfm-groups-alist
+ (delq (assoc nnwfm-address nnwfm-groups-alist)
+ nnwfm-groups-alist))
+ (push (cons nnwfm-address nnwfm-groups)
+ nnwfm-groups-alist)
+ (with-temp-file (expand-file-name "groups" nnwfm-directory)
+ (prin1 nnwfm-groups-alist (current-buffer))))
+
+(defun nnwfm-init (server)
+ "Initialize buffers and such."
+ (unless (file-exists-p nnwfm-directory)
+ (gnus-make-directory nnwfm-directory)))
+
+(defun nnwfm-generate-active ()
+ (save-excursion
+ (set-buffer nntp-server-buffer)
+ (erase-buffer)
+ (dolist (elem nnwfm-groups)
+ (insert (prin1-to-string (car elem))
+ " " (number-to-string (cadr elem)) " 1 y\n"))))
+
+(defun nnwfm-find-forum-table (contents)
+ (catch 'found
+ (nnwfm-find-forum-table-1 contents)))
+
+(defun nnwfm-find-forum-table-1 (contents)
+ (dolist (element contents)
+ (unless (stringp element)
+ (when (and (eq (car element) 'table)
+ (nnwfm-forum-table-p element))
+ (throw 'found element))
+ (when (nth 2 element)
+ (nnwfm-find-forum-table-1 (nth 2 element))))))
+
+(defun nnwfm-forum-table-p (parse)
+ (when (not (apply 'gnus-or
+ (mapcar
+ (lambda (p)
+ (nnweb-parse-find 'table p))
+ (nth 2 parse))))
+ (let ((href (cdr (assq 'href (nth 1 (nnweb-parse-find 'a parse 20)))))
+ case-fold-search)
+ (when (and href (string-match nnwfm-table-regexp href))
+ t))))
+
+(defun nnwfm-date-to-time (date)
+ (let ((time (mapcar #'string-to-number (split-string date "[\\.\\+ :]"))))
+ (encode-time 0 (nth 4 time) (nth 3 time)
+ (nth 0 time) (nth 1 time)
+ (if (< (nth 2 time) 70)
+ (+ 2000 (nth 2 time))
+ (+ 1900 (nth 2 time))))))
+
+(provide 'nnwfm)
+
+;; Local Variables:
+;; coding: iso-8859-1
+;; End:
+
+;;; nnwfm.el ends here
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