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+;;; nnweb.el --- retrieving articles via web search engines
+;; Copyright (C) 1996,97 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 'gnus)
+(require 'w3)
+(require 'url)
+(require 'nnmail)
+(ignore-errors
+  (require 'w3-forms))
+
+(nnoo-declare nnweb)
+
+(defvoo nnweb-directory (nnheader-concat gnus-directory "nnweb/")
+  "Where nnweb will save its files.")
+
+(defvoo nnweb-type 'dejanews
+  "What search engine type is being used.")
+
+(defvar nnweb-type-definition
+  '((dejanews
+     (article . nnweb-dejanews-wash-article)
+     (map . nnweb-dejanews-create-mapping)
+     (search . nnweb-dejanews-search)
+     (address . "http://xp9.dejanews.com/dnquery.xp")
+     (identifier . nnweb-dejanews-identity))
+    (reference
+     (article . nnweb-reference-wash-article)
+     (map . nnweb-reference-create-mapping)
+     (search . nnweb-reference-search)
+     (address . "http://www.reference.com/cgi-bin/pn/go")
+     (identifier . identity))
+    (altavista
+     (article . nnweb-altavista-wash-article)
+     (map . nnweb-altavista-create-mapping)
+     (search . nnweb-altavista-search)
+     (address . "http://www.altavista.digital.com/cgi-bin/query")
+     (id . "/cgi-bin/news?id@%s")
+     (identifier . identity)))
+  "Type-definition alist.")
+
+(defvoo nnweb-search nil
+  "Search string to feed to DejaNews.")
+
+(defvoo nnweb-max-hits 100
+  "Maximum number of hits to display.")
+
+(defvoo nnweb-ephemeral-p nil
+  "Whether this nnweb server is ephemeral.")
+
+;;; Internal variables
+
+(defvoo nnweb-articles nil)
+(defvoo nnweb-buffer nil)
+(defvoo nnweb-group-alist nil)
+(defvoo nnweb-group nil)
+(defvoo nnweb-hashtb nil)
+
+;;; Interface functions
+
+(nnoo-define-basics nnweb)
+
+(deffoo nnweb-retrieve-headers (articles &optional group server fetch-old)
+  (nnweb-possibly-change-server group server)
+  (save-excursion
+    (set-buffer nntp-server-buffer)
+    (erase-buffer)
+    (let (article header)
+      (while (setq article (pop articles))
+	(when (setq header (cadr (assq article nnweb-articles)))
+	  (nnheader-insert-nov header)))
+      'nov)))
+
+(deffoo nnweb-request-scan (&optional group server)
+  (nnweb-possibly-change-server group server)
+  (setq nnweb-hashtb (gnus-make-hashtable 4095))
+  (funcall (nnweb-definition 'map))
+  (unless nnweb-ephemeral-p
+    (nnweb-write-active)
+    (nnweb-write-overview group)))
+
+(deffoo nnweb-request-group (group &optional server dont-check)
+  (nnweb-possibly-change-server nil server)
+  (when (and group
+	     (not (equal group nnweb-group))
+	     (not nnweb-ephemeral-p))
+    (let ((info (assoc group nnweb-group-alist)))
+      (setq nnweb-group group)
+      (setq nnweb-type (nth 2 info))
+      (setq nnweb-search (nth 3 info))
+      (unless dont-check
+	(nnweb-read-overview group))))
+  (cond
+   ((not nnweb-articles)
+    (nnheader-report 'nnweb "No matching articles"))
+   (t
+    (let ((active (if nnweb-ephemeral-p
+		      (cons (caar nnweb-articles)
+			    (caar (last nnweb-articles)))
+		    (cadr (assoc group nnweb-group-alist)))))
+      (nnheader-report 'nnweb "Opened group %s" group)
+      (nnheader-insert
+       "211 %d %d %d %s\n" (length nnweb-articles)
+       (car active) (cdr active) group)))))
+
+(deffoo nnweb-close-group (group &optional server)
+  (nnweb-possibly-change-server group server)
+  (when (gnus-buffer-live-p nnweb-buffer)
+    (save-excursion
+      (set-buffer nnweb-buffer)
+      (set-buffer-modified-p nil)
+      (kill-buffer nnweb-buffer)))
+  t)
+
+(deffoo nnweb-request-article (article &optional group server buffer)
+  (nnweb-possibly-change-server group server)
+  (save-excursion
+    (set-buffer (or buffer nntp-server-buffer))
+    (let* ((header (cadr (assq article nnweb-articles)))
+	   (url (and header (mail-header-xref header))))
+      (when (or (and url
+		     (nnweb-fetch-url url))
+		(and (stringp article)
+		     (nnweb-definition 'id t)
+		     (let ((fetch (nnweb-definition 'id))
+			   art)
+		       (when (string-match "^<\\(.*\\)>$" article)
+			 (setq art (match-string 1 article)))
+		       (and fetch
+			    art
+			    (nnweb-fetch-url
+			     (format fetch article))))))
+	(unless nnheader-callback-function
+	  (funcall (nnweb-definition 'article))
+	  (nnweb-decode-entities))
+	(nnheader-report 'nnweb "Fetched article %s" article)
+	t))))
+
+(deffoo nnweb-close-server (&optional server)
+  (when (and (nnweb-server-opened server)
+	     (gnus-buffer-live-p nnweb-buffer))
+    (save-excursion
+      (set-buffer nnweb-buffer)
+      (set-buffer-modified-p nil)
+      (kill-buffer nnweb-buffer)))
+  (nnoo-close-server 'nnweb server))
+
+(deffoo nnweb-request-list (&optional server)
+  (nnweb-possibly-change-server nil server)
+  (save-excursion
+    (set-buffer nntp-server-buffer)
+    (nnmail-generate-active nnweb-group-alist)
+    t))
+
+(deffoo nnweb-request-update-info (group info &optional server)
+  (nnweb-possibly-change-server group server)
+  ;;(setcar (cddr info) nil)
+  )
+
+(deffoo nnweb-asynchronous-p ()
+  t)
+
+(deffoo nnweb-request-create-group (group &optional server args)
+  (nnweb-possibly-change-server nil server)
+  (nnweb-request-delete-group group)
+  (push `(,group ,(cons 1 0) ,@args) nnweb-group-alist)
+  (nnweb-write-active)
+  t)
+
+(deffoo nnweb-request-delete-group (group &optional force server)
+  (nnweb-possibly-change-server group server)
+  (gnus-delete-assoc group nnweb-group-alist)
+  (gnus-delete-file (nnweb-overview-file group))
+  t)
+
+(nnoo-define-skeleton nnweb)
+
+;;; Internal functions
+
+(defun nnweb-read-overview (group)
+  "Read the overview of GROUP and build the map."
+  (when (file-exists-p (nnweb-overview-file group))
+    (nnheader-temp-write nil
+      (nnheader-insert-file-contents (nnweb-overview-file group))
+      (goto-char (point-min))
+      (let (header)
+	(while (not (eobp))
+	  (setq header (nnheader-parse-nov))
+	  (forward-line 1)
+	  (push (list (mail-header-number header)
+		      header (mail-header-xref header))
+		nnweb-articles)
+	  (nnweb-set-hashtb header (car nnweb-articles)))))))
+
+(defun nnweb-write-overview (group)
+  "Write the overview file for GROUP."
+  (nnheader-temp-write (nnweb-overview-file group)
+    (let ((articles nnweb-articles))
+      (while articles
+	(nnheader-insert-nov (cadr (pop articles)))))))
+
+(defun nnweb-set-hashtb (header data)
+  (gnus-sethash (nnweb-identifier (mail-header-xref header))
+		data nnweb-hashtb))
+
+(defun nnweb-get-hashtb (url)
+  (gnus-gethash (nnweb-identifier url) nnweb-hashtb))
+
+(defun nnweb-identifier (ident)
+  (funcall (nnweb-definition 'identifier) ident))
+
+(defun nnweb-overview-file (group)
+  "Return the name of the overview file of GROUP."
+  (nnheader-concat nnweb-directory group ".overview"))
+
+(defun nnweb-write-active ()
+  "Save the active file."
+  (nnheader-temp-write (nnheader-concat nnweb-directory "active")
+    (prin1 `(setq nnweb-group-alist ',nnweb-group-alist) (current-buffer))))
+
+(defun nnweb-read-active ()
+  "Read the active file."
+  (load (nnheader-concat nnweb-directory "active") t t t))
+
+(defun nnweb-definition (type &optional noerror)
+  "Return the definition of TYPE."
+  (let ((def (cdr (assq type (assq nnweb-type nnweb-type-definition)))))
+    (when (and (not def)
+	       (not noerror))
+      (error "Undefined definition %s" type))
+    def))
+
+(defun nnweb-possibly-change-server (&optional group server)
+  (nnweb-init server)
+  (when server
+    (unless (nnweb-server-opened server)
+      (nnweb-open-server server)))
+  (unless nnweb-group-alist
+    (nnweb-read-active))
+  (when group
+    (when (and (not nnweb-ephemeral-p)
+	       (not (equal group nnweb-group)))
+      (nnweb-request-group group nil t))))
+
+(defun nnweb-init (server)
+  "Initialize buffers and such."
+  (unless (gnus-buffer-live-p nnweb-buffer)
+    (setq nnweb-buffer
+	  (save-excursion
+	    (nnheader-set-temp-buffer
+	     (format " *nnweb %s %s %s*" nnweb-type nnweb-search server))))))
+
+(defun nnweb-fetch-url (url)
+  (save-excursion
+    (if (not nnheader-callback-function)
+	(let ((buf (current-buffer)))
+	  (save-excursion
+	    (set-buffer nnweb-buffer)
+	    (erase-buffer)
+	    (prog1
+		(url-insert-file-contents url)
+	      (copy-to-buffer buf (point-min) (point-max)))))
+      (nnweb-url-retrieve-asynch
+       url 'nnweb-callback (current-buffer) nnheader-callback-function)
+      t)))
+
+(defun nnweb-callback (buffer callback)
+  (when (gnus-buffer-live-p url-working-buffer)
+    (save-excursion
+      (set-buffer url-working-buffer)
+      (funcall (nnweb-definition 'article))
+      (nnweb-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 nnweb-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 " *nnweb*")))
+    (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 nnweb-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 nnweb-fetch-form (url pairs)
+  (let ((url-request-data (nnweb-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)
+    (setq buffer-file-name nil))
+  t)
+
+(defun nnweb-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)))
+
+(defun nnweb-remove-markup ()
+  (goto-char (point-min))
+  (while (search-forward "<!--" nil t)
+    (delete-region (match-beginning 0)
+		   (or (search-forward "-->" nil t)
+		       (point-max))))
+  (goto-char (point-min))
+  (while (re-search-forward "<[^>]+>" nil t)
+    (replace-match "" t t)))
+
+;;;
+;;; DejaNews functions.
+;;;
+
+(defun nnweb-dejanews-create-mapping ()
+  "Perform the search and create an number-to-url alist."
+  (save-excursion
+    (set-buffer nnweb-buffer)
+    (erase-buffer)
+    (when (funcall (nnweb-definition 'search) nnweb-search)
+      (let ((i 0)
+	    (more t)
+	    (case-fold-search t)
+	    (active (or (cadr (assoc nnweb-group nnweb-group-alist))
+			(cons 1 0)))
+	    Subject Score Date Newsgroup Author
+	    map url)
+	(while more
+	  ;; Go through all the article hits on this page.
+	  (goto-char (point-min))
+	  (nnweb-decode-entities)
+	  (goto-char (point-min))
+	  (while (re-search-forward "^ +[0-9]+\\." nil t)
+	    (narrow-to-region
+	     (point)
+	     (cond ((re-search-forward "^ +[0-9]+\\." nil t)
+		    (match-beginning 0))
+		   ((search-forward "\n\n" nil t)
+		    (point))
+		   (t
+		    (point-max))))
+	    (goto-char (point-min))
+	    (when (looking-at ".*HREF=\"\\([^\"]+\\)\"")
+	      (setq url (match-string 1)))
+	    (nnweb-remove-markup)
+	    (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]+ *$" Subject)
+	      (setq Subject (substring Subject 0 (match-beginning 0))))
+	    (incf i)
+	    (unless (nnweb-get-hashtb url)
+	      (push
+	       (list
+		(incf (cdr active))
+		(make-full-mail-header
+		 (cdr active) (concat  "(" Newsgroup ") " Subject) Author Date
+		 (concat "<" (nnweb-identifier url) "@dejanews>")
+		 nil 0 (string-to-int Score) url))
+	       map)
+	      (nnweb-set-hashtb (cadar map) (car map))))
+	  ;; See whether there is a "Get next 20 hits" button here.
+	  (if (or (not (re-search-forward
+			"HREF=\"\\([^\"]+\\)\">Get next" nil t))
+		  (>= i nnweb-max-hits))
+	      (setq more nil)
+	    ;; Yup -- fetch it.
+	    (setq more (match-string 1))
+	    (erase-buffer)
+	    (url-insert-file-contents more)))
+	;; Return the articles in the right order.
+	(setq nnweb-articles
+	      (sort (nconc nnweb-articles map)
+		    (lambda (s1 s2) (< (car s1) (car s2)))))))))
+
+(defun nnweb-dejanews-wash-article ()
+  (let ((case-fold-search t))
+    (goto-char (point-min))
+    (re-search-forward "<PRE>" nil t)
+    (delete-region (point-min) (point))
+    (re-search-forward "</PRE>" nil t)
+    (delete-region (point) (point-max))
+    (nnweb-remove-markup)
+    (goto-char (point-min))
+    (while (and (looking-at " *$")
+		(not (eobp)))
+      (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 nnweb-dejanews-search (search)
+  (nnweb-fetch-form
+   (nnweb-definition 'address)
+   `(("query" . ,search)
+     ("defaultOp" . "AND")
+     ("svcclass" . "dncurrent")
+     ("maxhits" . "100")
+     ("format" . "verbose")
+     ("threaded" . "0")
+     ("showsort" . "score")
+     ("agesign" . "1")
+     ("ageweight" . "1")))
+  t)
+
+(defun nnweb-dejanews-identity (url)
+  "Return an unique identifier based on URL."
+  (if (string-match "recnum=\\([0-9]+\\)" url)
+      (match-string 1 url)
+    url))
+
+;;;
+;;; InReference
+;;;
+
+(defun nnweb-reference-create-mapping ()
+  "Perform the search and create an number-to-url alist."
+  (save-excursion
+    (set-buffer nnweb-buffer)
+    (erase-buffer)
+    (when (funcall (nnweb-definition 'search) nnweb-search)
+      (let ((i 0)
+	    (more t)
+	    (case-fold-search t)
+	    (active (or (cadr (assoc nnweb-group nnweb-group-alist))
+			(cons 1 0)))
+	    Subject Score Date Newsgroups From Message-ID
+	    map url)
+	(while more
+	  ;; Go through all the article hits on this page.
+	  (goto-char (point-min))
+	  (search-forward "</pre><hr>" nil t)
+	  (delete-region (point-min) (point))
+					;(nnweb-decode-entities)
+	  (goto-char (point-min))
+	  (while (re-search-forward "^ +[0-9]+\\." nil t)
+	    (narrow-to-region
+	     (point)
+	     (if (re-search-forward "^$" nil t)
+		 (match-beginning 0)
+	       (point-max)))
+	    (goto-char (point-min))
+	    (when (looking-at ".*href=\"\\([^\"]+\\)\"")
+	      (setq url (match-string 1)))
+	    (nnweb-remove-markup)
+	    (goto-char (point-min))
+	    (while (search-forward "\t" nil t)
+	      (replace-match " "))
+	    (goto-char (point-min))
+	    (while (re-search-forward "^\\([^:]+\\): \\(.*\\)$" nil t)
+	      (set (intern (match-string 1)) (match-string 2)))
+	    (widen)
+	    (search-forward "</pre>" nil t)
+	    (incf i)
+	    (unless (nnweb-get-hashtb url)
+	      (push
+	       (list
+		(incf (cdr active))
+		(make-full-mail-header
+		 (cdr active) (concat  "(" Newsgroups ") " Subject) From Date
+		 Message-ID
+		 nil 0 (string-to-int Score) url))
+	       map)
+	      (nnweb-set-hashtb (cadar map) (car map))))
+	  (setq more nil))
+	;; Return the articles in the right order.
+	(setq nnweb-articles
+	      (sort (nconc nnweb-articles map)
+		    (lambda (s1 s2) (< (car s1) (car s2)))))))))
+
+(defun nnweb-reference-wash-article ()
+  (let ((case-fold-search t))
+    (goto-char (point-min))
+    (re-search-forward "^</center><hr>" nil t)
+    (delete-region (point-min) (point))
+    (search-forward "<pre>" nil t)
+    (forward-line -1)
+    (let ((body (point-marker)))
+      (search-forward "</pre>" nil t)
+      (delete-region (point) (point-max))
+      (nnweb-remove-markup)
+      (goto-char (point-min))
+      (while (looking-at " *$")
+	(gnus-delete-line))
+      (narrow-to-region (point-min) body)
+      (while (and (re-search-forward "^$" nil t)
+		  (not (eobp)))
+	(gnus-delete-line))
+      (goto-char (point-min))
+      (while (looking-at "\\(^[^ ]+:\\) *")
+	(replace-match "\\1 " t)
+	(forward-line 1))
+      (goto-char (point-min))
+      (when (re-search-forward "^References:" nil t)
+	(narrow-to-region
+	 (point) (if (re-search-forward "^$\\|^[^:]+:" nil t)
+		     (match-beginning 0)
+		   (point-max)))
+	(goto-char (point-min))
+	(while (not (eobp))
+	  (unless (looking-at "References")
+	    (insert "\t")
+	    (forward-line 1)))
+	(goto-char (point-min))
+	(while (search-forward "," nil t)
+	  (replace-match " " t t)))
+      (widen)
+      (set-marker body nil))))
+
+(defun nnweb-reference-search (search)
+  (prog1
+      (url-insert-file-contents
+       (concat
+	(nnweb-definition 'address)
+	"?"
+	(nnweb-encode-www-form-urlencoded
+	 `(("search" . "advanced")
+	   ("querytext" . ,search)
+	   ("subj" . "")
+	   ("name" . "")
+	   ("login" . "")
+	   ("host" . "")
+	   ("organization" . "")
+	   ("groups" . "")
+	   ("keywords" . "")
+	   ("choice" . "Search")
+	   ("startmonth" . "Jul")
+	   ("startday" . "25")
+	   ("startyear" . "1996")
+	   ("endmonth" . "Aug")
+	   ("endday" . "24")
+	   ("endyear" . "1996")
+	   ("mode" . "Quick")
+	   ("verbosity" . "Verbose")
+	   ("ranking" . "Relevance")
+	   ("first" . "1")
+	   ("last" . "25")
+	   ("score" . "50")))))
+    (setq buffer-file-name nil))
+  t)
+
+;;;
+;;; Alta Vista
+;;;
+
+(defun nnweb-altavista-create-mapping ()
+  "Perform the search and create an number-to-url alist."
+  (save-excursion
+    (set-buffer nnweb-buffer)
+    (erase-buffer)
+    (let ((part 0))
+      (when (funcall (nnweb-definition 'search) nnweb-search part)
+	(let ((i 0)
+	      (more t)
+	      (case-fold-search t)
+	      (active (or (cadr (assoc nnweb-group nnweb-group-alist))
+			  (cons 1 0)))
+	      subject date from id group
+	      map url)
+	  (while more
+	    ;; Go through all the article hits on this page.
+	    (goto-char (point-min))
+	    (search-forward "<dt>" nil t)
+	    (delete-region (point-min) (match-beginning 0))
+	    (goto-char (point-min))
+	    (while (search-forward "<dt>" nil t)
+	      (replace-match "\n<blubb>"))
+	    (nnweb-decode-entities)
+	    (goto-char (point-min))
+	    (while (re-search-forward "<blubb>.*href=\"\\([^\"]+\\)\"><strong>\\([^>]*\\)</strong></a><dd>\\([^-]+\\)- <b>\\([^<]+\\)<.*href=\"news:\\([^\"]+\\)\">.*\">\\(.+\\)</a><P>"
+				      nil t)
+	      (setq url (match-string 1)
+		    subject (match-string 2)
+		    date (match-string 3)
+		    group (match-string 4)
+		    id (concat "<" (match-string 5) ">")
+		    from (match-string 6))
+	      (incf i)
+	      (unless (nnweb-get-hashtb url)
+		(push
+		 (list
+		  (incf (cdr active))
+		  (make-full-mail-header
+		   (cdr active) (concat  "(" group ") " subject) from date
+		   id nil 0 0 url))
+		 map)
+		(nnweb-set-hashtb (cadar map) (car map))))
+	    ;; See if we want more.
+	    (when (or (not nnweb-articles)
+		      (>= i nnweb-max-hits)
+		      (not (funcall (nnweb-definition 'search)
+				    nnweb-search (incf part))))
+	      (setq more nil)))
+	  ;; Return the articles in the right order.
+	  (setq nnweb-articles
+		(sort (nconc nnweb-articles map)
+		      (lambda (s1 s2) (< (car s1) (car s2))))))))))
+
+(defun nnweb-altavista-wash-article ()
+  (goto-char (point-min))
+  (let ((case-fold-search t))
+    (when (re-search-forward "^<strong>" nil t)
+      (delete-region (point-min) (match-beginning 0)))
+    (goto-char (point-min))
+    (while (looking-at "<strong>\\([^ ]+\\) +</strong> +\\(.*\\)$")
+      (replace-match "\\1: \\2" t)
+      (forward-line 1))
+    (when (re-search-backward "^References:" nil t)
+      (narrow-to-region (point) (progn (forward-line 1) (point)))
+      (goto-char (point-min))
+      (while (re-search-forward "<A.*\\?id@\\([^\"]+\\)\">[0-9]+</A>" nil t)
+	(replace-match "&lt;\\1&gt; " t)))
+    (widen)
+    (nnweb-remove-markup)))
+
+(defun nnweb-altavista-search (search &optional part)
+  (prog1
+      (url-insert-file-contents
+       (concat
+	(nnweb-definition 'address)
+	"?"
+	(nnweb-encode-www-form-urlencoded
+	 `(("pg" . "aq")
+	   ("what" . "news")
+	   ,@(when part `(("stq" . ,(int-to-string (* part 30)))))
+	   ("fmt" . "d")
+	   ("q" . ,search)
+	   ("r" . "")
+	   ("d0" . "")
+	   ("d1" . "")))))
+    (setq buffer-file-name nil)))
+
+(provide 'nnweb)
+
+;;; nnweb.el ends here