-;;; nndejagnus.el --- retrieving articles via DejaNews
-;; Copyright (C) 1996 Free Software Foundation, Inc.
-
-;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
-;; 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:
-
-(require 'nnoo)
-(require 'message)
-(require 'gnus-util)
-(require 'w3-forms)
-(require 'url)
-
-(nnoo-declare nndejagnus)
-
-(defvoo nndejagnus-address "http://www.dejagnus.com/"
- "Base URL of the DejaNews search engine.")
-
-(defvoo nndejagnus-search nil
- "Search string to feed to DejaNews.")
-
-(defvoo nndejagnus-max-hits 100
- "Maximum number of hits to display.")
-
-;;; Internal variables
-
-(defvoo nndejagnus-articles nil)
-(defvoo nndejagnus-buffer nil)
-(defvoo nndejagnus-async-buffer nil)
-(defvar nndejagnus-callback-function nil)
-(defvar nndejagnus-to-buffer nil)
-(defvar nndejagnus-start-point nil)
-(defvar nndejagnus-inside-change-function nil)
-
-;;; Interface functions
-
-(nnoo-define-basics nndejagnus)
-
-(deffoo nndejagnus-retrieve-headers (articles &optional group server fetch-old)
- (nndejagnus-possibly-change-server server)
- (save-excursion
- (set-buffer nntp-server-buffer)
- (erase-buffer)
- (let (article header)
- (while (setq article (pop articles))
- (when (setq header (cadr (assq article nndejagnus-articles)))
- (nnheader-insert-nov header)))
- 'nov)))
-
-(deffoo nndejagnus-request-group (group &optional server dont-check)
- (nndejagnus-possibly-change-server server)
- (when (or (not dont-check)
- (not nndejagnus-articles))
- (nndejagnus-create-mapping group))
- (cond
- ((not nndejagnus-articles)
- (nnheader-report 'nndejagnus "Couldn't request search"))
- (t
- (nnheader-report 'nndejagnus "Opened group %s" group)
- (nnheader-insert
- "211 %d %d %d %s\n" (length nndejagnus-articles)
- (caar nndejagnus-articles) (caar (last nndejagnus-articles))
- group))))
-
-(deffoo nndejagnus-request-article (article &optional group server buffer)
- (nndejagnus-possibly-change-server server)
- (save-excursion
- (set-buffer (or buffer nntp-server-buffer))
- (let ((url (caddr (assq article nndejagnus-articles))))
- (when (and url
- (nndejagnus-fetch-url url))
- (unless nnheader-callback-function
- (nndejagnus-decode-article)
- (nndejagnus-decode-entities))
- (nnheader-report 'nndejagnus "Fetched article %s" article)
- t))))
-
-(deffoo nndejagnus-close-server (&optional server)
- (when (nndejagnus-server-opened server)
- (gnus-kill-buffer nndejagnus-buffer))
- (nnoo-close-server 'nndejagnus server))
-
-(deffoo nndejagnus-request-update-info (group info &optional server)
- (nndejagnus-possibly-change-server server)
- (setcar (cddr info) nil))
-
-(deffoo nndejagnus-asynchronous-p ()
- t)
-
-(nnoo-define-skeleton nndejagnus)
-
-;;; Internal functions
-
-(defun nndejagnus-possibly-change-server (&optional server)
- (nndejagnus-init server)
- (when server
- (unless (nndejagnus-server-opened server)
- (nndejagnus-open-server server))))
-
-(defun nndejagnus-init (server)
- "Initialize buffers and such."
- (unless (gnus-buffer-live-p nndejagnus-buffer)
- (setq nndejagnus-buffer
- (save-excursion
- (nnheader-set-temp-buffer
- (format " *nndejagnus %s*" server))))))
-
-(defun nndejagnus-create-mapping (group)
- "Perform the search and create an number-to-url alist."
- (save-excursion
- (set-buffer nndejagnus-buffer)
- (erase-buffer)
- (when (nndejagnus-fetch-search nndejagnus-search)
- (let ((i 0)
- (more t)
- Subject Score Date Newsgroup Author
- map url)
- (while more
- ;; Go through all the article hits on this page.
- (goto-char (point-min))
- (nndejagnus-decode-entities)
- (goto-char (point-min))
- (while (re-search-forward "^ +[0-9]+\\." nil t)
- (narrow-to-region
- (point)
- (if (re-search-forward "^ +[0-9]+\\." nil t)
- (match-beginning 0)
- (point-max)))
- (goto-char (point-min))
- (when (looking-at ".*HREF=\"\\([^\"]+\\)\"")
- (setq url (match-string 1)))
- (while (re-search-forward "<[^>]+>" nil t)
- (replace-match "" t t))
- (goto-char (point-min))
- (while (search-forward "\t" nil t)
- (replace-match " "))
- (goto-char (point-min))
- (while (re-search-forward "^ +\\([^:]+\\): +\\(.*\\)$" nil t)
- (set (intern (match-string 1)) (match-string 2)))
- (widen)
- (when (string-match "#[0-9]+/[0-9]+ *$" Subject)
- (setq Subject (substring Subject 0 (match-beginning 0))))
- (push
- (list
- (incf i)
- (make-full-mail-header
- i (concat "(" Newsgroup ") " Subject) Author Date
- (concat "<" (message-unique-id) "-" (int-to-string i)
- "@dejanews>")
- nil 0 (string-to-int Score) nil)
- url)
- map))
- ;; See whether there is a "Get next 20 hits" button here.
- (if (or (not (re-search-forward
- "HREF=\"\\([^\"]+\\)\">Get next" nil t))
- (> i nndejagnus-max-hits))
- (setq more nil)
- ;; Yup -- fetch it.
- (setq more (match-string 1))
- (erase-buffer)
- (url-insert-file-contents more)))
- ;; Return the articles in the right order.
- (setq nndejagnus-articles (nreverse map))))))
-
-(defun nndejagnus-fetch-url (url)
- (save-excursion
- (if (not nnheader-callback-function)
- (let ((buf (current-buffer)))
- (save-excursion
- (set-buffer nndejagnus-buffer)
- (erase-buffer)
- (prog1
- (url-insert-file-contents url)
- (copy-to-buffer buf (point-min) (point-max)))))
- (nndejagnus-url-retrieve-asynch
- url 'nndejanews-callback (current-buffer) nnheader-callback-function)
- t)))
-
-(defun nndejanews-callback (buffer callback)
- (save-excursion
- (set-buffer url-working-buffer)
- (nndejagnus-decode-article)
- (nndejagnus-decode-entities)
- (set-buffer buffer)
- (goto-char (point-max))
- (insert-buffer-substring url-working-buffer))
- (funcall callback t)
- (gnus-kill-buffer url-working-buffer))
-
-(defun nndejagnus-url-retrieve-asynch (url callback &rest data)
- (let ((url-request-method "GET")
- (old-asynch url-be-asynchronous)
- (url-request-data nil)
- (url-request-extra-headers nil)
- (url-working-buffer (generate-new-buffer-name " *dejanews*")))
- (setq-default url-be-asynchronous t)
- (save-excursion
- (set-buffer (get-buffer-create url-working-buffer))
- (setq url-current-callback-data data
- url-be-asynchronous t
- url-current-callback-func callback)
- (url-retrieve url))
- (setq-default url-be-asynchronous old-asynch)))
-
-(defun nndejagnus-decode-article ()
- (goto-char (point-min))
- (re-search-forward "<PRE>" nil t)
- (delete-region (point-min) (point))
- (re-search-forward "</PRE>" nil t)
- (delete-region (point) (point-max))
- (goto-char (point-min))
- (while (re-search-forward "<[^>]+>" nil t)
- (replace-match "" t t))
- (goto-char (point-min))
- (while (looking-at " *$")
- (gnus-delete-line))
- (while (looking-at "\\(^[^ ]+:\\) *")
- (replace-match "\\1 " t)
- (forward-line 1))
- (when (re-search-forward "\n\n+" nil t)
- (replace-match "\n" t t)))
-
-(defun nndejagnus-encode-www-form-urlencoded (pairs)
- "Return PAIRS encoded for forms."
- (mapconcat
- (function
- (lambda (data)
- (concat (w3-form-encode-xwfu (car data)) "="
- (w3-form-encode-xwfu (cdr data))))) pairs "&"))
-
-(defun nndejagnus-fetch-form (url pairs)
- (let ((url-request-data (nndejagnus-encode-www-form-urlencoded pairs))
- (url-request-method 'POST)
- (url-request-extra-headers
- '(("Content-type" . "application/x-www-form-urlencoded"))))
- (url-insert-file-contents url)))
-
-(defun nndejagnus-fetch-search (search)
- (nndejagnus-fetch-form
- "http://xp6.dejanews.com/dnquery.xp"
- `(("query" . ,search)
- ("defaultOp" . "AND")
- ("svcclass" . "dncurrent")
- ("maxhits" . "25")
- ("format" . "verbose")
- ("threaded" . "0")
- ("showsort" . "score")
- ("agesign" . "1")
- ("ageweight" . "1"))))
-
-(defun nndejagnus-decode-entities ()
- (goto-char (point-min))
- (while (re-search-forward "&\\([a-z]+\\);" nil t)
- (replace-match (char-to-string (or (cdr (assq (intern (match-string 1))
- w3-html-entities ))
- ?#))
- t t)))
-
-; "^ +\\([0-9]+\\)\\. +\\([0-9]+\\)/+\\([0-9]+\\)/+\\([0-9]+\\) +\\([0-9]+\\).+HREF=\"\\([^\"]+\\)\">\\([^<]+\\)<.*<B> *\\(.*\\)</B>.+>\\([^<>]+\\)</A> *$"
-
-(provide 'nndejagnus)
-
-;;; nndejagnus.el ends here
projects / gnus / blobdiff