X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=lisp%2Fnnwarchive.el;h=4057db58aca079aada1a6dc33bde45198d4017a4;hb=9666b624de9a725ca0ba06db23573ae684359225;hp=33bd5ea81b151e2f66adb885aa583ea413a6b451;hpb=73edf76920c3d86afa1628ca8f1509394cb7b26c;p=elisp%2Fgnus.git- diff --git a/lisp/nnwarchive.el b/lisp/nnwarchive.el index 33bd5ea..4057db5 100644 --- a/lisp/nnwarchive.el +++ b/lisp/nnwarchive.el @@ -2,7 +2,7 @@ ;; Copyright (C) 1999 Free Software Foundation, Inc. ;; Author: Shenghuo Zhu -;; Keywords: news +;; Keywords: news egroups mail-archive ;; This file is part of GNU Emacs. @@ -23,16 +23,12 @@ ;;; Commentary: -;; Note: You need to have `url' and `w3' installed for this backend to -;; work. +;; Note: You need to have `url' (w3 0.46) or greater version +;; installed for this backend to work. -;; A lot of codes stolen from mail-source, nnslashdot, nnweb. - -;; Todo: To support more web archives. - -;; Known bugs: in w3 0.44, there are two copies of url-maybe-relative. -;; If it is loaded from w3.el, (load-library "url"). w3 0.45 should -;; work. +;; Todo: +;; 1. To support more web archives. +;; 2. Generalize webmail to other MHonArc archive. ;;; Code: @@ -42,6 +38,7 @@ (require 'message) (require 'gnus-util) (require 'gnus) +(require 'gnus-bcklg) (require 'nnmail) (require 'mm-util) (require 'mail-source) @@ -60,38 +57,57 @@ (nnoo-declare nnwarchive) -(eval-and-compile - (defvar nnwarchive-type-definition - '((egroups - (open-url - "http://www.egroups.com/register?method=loginAction&email=%s&password=%s" - login passwd) - (list-url - "http://www.egroups.com/UserGroupsPage?") - (list-dissect . nnwarchive-egroups-list) - (list-groups . nnwarchive-egroups-list-groups) - (xover-url - "http://www.egroups.com/group/%s/?fetchForward=1&start=%d" group start) - (xover-last-url - "http://www.egroups.com/group/%s/?fetchForward=1" group) - (xover-page-size . 13) - (xover-dissect . nnwarchive-egroups-xover) - (article-url - "http://www.egroups.com/group/%s/%d.html?raw=1" group article) - (article-dissect . nnwarchive-egroups-article))))) - -(eval-and-compile - (defvar nnwarchive-short-names - '(login passwd))) +(defvar nnwarchive-type-definition + '((egroups + (address . "www.egroups.com") + (open-url + "http://www.egroups.com/register?method=loginAction&email=%s&password=%s" + nnwarchive-login nnwarchive-passwd) + (list-url + "http://www.egroups.com/UserGroupsPage?") + (list-dissect . nnwarchive-egroups-list) + (list-groups . nnwarchive-egroups-list-groups) + (xover-url + "http://www.egroups.com/group/%s/?fetchForward=1&start=%d" group aux) + (xover-last-url + "http://www.egroups.com/group/%s/?fetchForward=1" group) + (xover-page-size . 13) + (xover-dissect . nnwarchive-egroups-xover) + (article-url + "http://www.egroups.com/group/%s/%d.html?raw=1" group article) + (article-dissect . nnwarchive-egroups-article) + (authentication . t) + (article-offset . 0) + (xover-files . nnwarchive-egroups-xover-files)) + (mail-archive + (address . "www.mail-archive.com") + (open-url) + (list-url + "http://www.mail-archive.com/lists.html") + (list-dissect . nnwarchive-mail-archive-list) + (list-groups . nnwarchive-mail-archive-list-groups) + (xover-url + "http://www.mail-archive.com/%s/mail%d.html" group aux) + (xover-last-url + "http://www.mail-archive.com/%s/maillist.html" group) + (xover-page-size) + (xover-dissect . nnwarchive-mail-archive-xover) + (article-url + "http://www.mail-archive.com/%s/msg%05d.html" group article1) + (article-dissect . nnwarchive-mail-archive-article) + (xover-files . nnwarchive-mail-archive-xover-files) + (authentication) + (article-offset . 1)))) + +(defvar nnwarchive-default-type 'egroups) (defvoo nnwarchive-directory (nnheader-concat gnus-directory "warchive/") "Where nnwarchive will save its files.") -(eval-and-compile - (defvoo nnwarchive-type 'egroups - "The type of nnwarchive.")) +(defvoo nnwarchive-type nil + "The type of nnwarchive.") -(defvoo nnwarchive-address "egroups.com" +(defvoo nnwarchive-address "" "The address of nnwarchive.") (defvoo nnwarchive-login nil @@ -104,138 +120,148 @@ (defvoo nnwarchive-headers-cache nil) -(defvoo nnwarchive-opened nil) +(defvoo nnwarchive-authentication nil) + +(defvoo nnwarchive-nov-is-evil nil) (defconst nnwarchive-version "nnwarchive 1.0") ;;; Internal variables -(defvar nnwarchive-open-url nil) -(defvar nnwarchive-open-dissect nil) +(defvoo nnwarchive-open-url nil) +(defvoo nnwarchive-open-dissect nil) + +(defvoo nnwarchive-list-url nil) +(defvoo nnwarchive-list-dissect nil) +(defvoo nnwarchive-list-groups nil) + +(defvoo nnwarchive-xover-files nil) +(defvoo nnwarchive-xover-url nil) +(defvoo nnwarchive-xover-last-url nil) +(defvoo nnwarchive-xover-dissect nil) +(defvoo nnwarchive-xover-page-size nil) -(defvar nnwarchive-list-url nil) -(defvar nnwarchive-list-dissect nil) -(defvar nnwarchive-list-groups nil) +(defvoo nnwarchive-article-url nil) +(defvoo nnwarchive-article-dissect nil) +(defvoo nnwarchive-xover-files nil) +(defvoo nnwarchive-article-offset 0) -(defvar nnwarchive-xover-url nil) -(defvar nnwarchive-xover-last-url nil) -(defvar nnwarchive-xover-dissect nil) -(defvar nnwarchive-xover-page-size nil) +(defvoo nnwarchive-buffer nil) -(defvar nnwarchive-article-url nil) -(defvar nnwarchive-article-dissect nil) +(defvoo nnwarchive-keep-backlog 300) +(defvar nnwarchive-backlog-articles nil) +(defvar nnwarchive-backlog-hashtb nil) -(defvar nnwarchive-buffer nil) +(defvoo nnwarchive-headers nil) -(defvar nnwarchive-headers nil) ;;; Interface functions (nnoo-define-basics nnwarchive) -(eval-and-compile - (defun nnwarchive-bind-1 () - (let ((defaults (cdr (assq nnwarchive-type nnwarchive-type-definition))) - (short-names nnwarchive-short-names) - default bind) - (while (setq default (pop defaults)) - (push (list (intern (concat "nnwarchive-" (symbol-name (car default)))) - (list 'quote (cdr default))) bind)) - (while (setq default (pop short-names)) - (push (list default - (intern (concat "nnwarchive-" - (symbol-name default)))) - bind)) - bind))) - -(defmacro nnwarchive-bind (&rest body) - "Return a `let' form that binds all variables in TYPE. -Read `mail-source-bind' for details." - `(let ,(nnwarchive-bind-1) - ,@body)) - -(put 'nnwarchive-bind 'lisp-indent-function 0) -(put 'nnwarchive-bind 'edebug-form-spec '(form body)) +(defun nnwarchive-set-default (type) + (let ((defs (cdr (assq type nnwarchive-type-definition))) + def) + (dolist (def defs) + (set (intern (concat "nnwarchive-" (symbol-name (car def)))) + (cdr def))))) + +(defmacro nnwarchive-backlog (&rest form) + `(let ((gnus-keep-backlog nnwarchive-keep-backlog) + (gnus-backlog-buffer + (format " *nnwarchive backlog %s*" nnwarchive-address)) + (gnus-backlog-articles nnwarchive-backlog-articles) + (gnus-backlog-hashtb nnwarchive-backlog-hashtb)) + (unwind-protect + (progn ,@form) + (setq nnwarchive-backlog-articles gnus-backlog-articles + nnwarchive-backlog-hashtb gnus-backlog-hashtb)))) +(put 'nnwarchive-backlog 'lisp-indent-function 0) +(put 'nnwarchive-backlog 'edebug-form-spec '(form body)) + +(defun nnwarchive-backlog-enter-article (group number buffer) + (nnwarchive-backlog + (gnus-backlog-enter-article group number buffer))) + +(defun nnwarchive-get-article (article &optional group server buffer) + (if (numberp article) + (if (nnwarchive-backlog + (gnus-backlog-request-article group article + (or buffer nntp-server-buffer))) + (cons group article) + (let (contents) + (save-excursion + (set-buffer nnwarchive-buffer) + (goto-char (point-min)) + (let ((article1 (- article nnwarchive-article-offset))) + (nnwarchive-url nnwarchive-article-url)) + (setq contents (funcall nnwarchive-article-dissect group article))) + (when contents + (save-excursion + (set-buffer (or buffer nntp-server-buffer)) + (erase-buffer) + (insert contents) + (nnwarchive-backlog-enter-article group article (current-buffer)) + (nnheader-report 'nnwarchive "Fetched article %s" article) + (cons group article))))) + nil)) (deffoo nnwarchive-retrieve-headers (articles &optional group server fetch-old) (nnwarchive-possibly-change-server group server) - (nnwarchive-bind + (if (or gnus-nov-is-evil nnwarchive-nov-is-evil) + (with-temp-buffer + (with-current-buffer nntp-server-buffer + (erase-buffer)) + (let ((buf (current-buffer)) b e) + (dolist (art articles) + (nnwarchive-get-article art group server buf) + (setq b (goto-char (point-min))) + (if (search-forward "\n\n" nil t) + (forward-char -1) + (goto-char (point-max))) + (setq e (point)) + (with-current-buffer nntp-server-buffer + (insert (format "221 %d Article retrieved.\n" art)) + (insert-buffer-substring buf b e) + (insert ".\n")))) + 'headers) (setq nnwarchive-headers (cdr (assoc group nnwarchive-headers-cache))) (save-excursion (set-buffer nnwarchive-buffer) (erase-buffer) - (let (point start starts) - (setq starts (nnwarchive-paged (sort articles '<))) - (while (setq start (pop starts)) - (goto-char (point-max)) - (nnwarchive-url nnwarchive-xover-url)) - (if nnwarchive-xover-dissect - (funcall nnwarchive-xover-dissect)))) + (funcall nnwarchive-xover-files group articles)) (save-excursion (set-buffer nntp-server-buffer) (erase-buffer) (let (header) - (dolist (art articles) - (if (setq header (assq art nnwarchive-headers)) - (nnheader-insert-nov (cdr header)))))) + (dolist (art articles) + (if (setq header (assq art nnwarchive-headers)) + (nnheader-insert-nov (cdr header)))))) (let ((elem (assoc group nnwarchive-headers-cache))) (if elem (setcdr elem nnwarchive-headers) (push (cons group nnwarchive-headers) nnwarchive-headers-cache))) 'nov)) -(deffoo nnwarchive-retrieve-groups (groups &optional server) - "Retrieve group info on GROUPS." - (nnwarchive-possibly-change-server nil server) - (nnwarchive-bind - (if nnwarchive-list-groups - (funcall nnwarchive-list-groups groups)) - (nnwarchive-write-groups) - (nnwarchive-generate-active) - 'active)) - (deffoo nnwarchive-request-group (group &optional server dont-check) (nnwarchive-possibly-change-server nil server) - (nnwarchive-bind - (if nnwarchive-list-groups - (funcall nnwarchive-list-groups (list group))) - (nnwarchive-write-groups) - (let ((elem (assoc group nnwarchive-groups))) - (cond - ((not elem) - (nnheader-report 'nnwarchive "Group does not exist")) - (t - (nnheader-report 'nnwarchive "Opened group %s" group) - (nnheader-insert - "211 %d %d %d %s\n" (or (cadr elem) 0) 1 (or (cadr elem) 0) - (prin1-to-string group)) - t))))) - -(deffoo nnwarchive-close-group (group &optional server) - (nnwarchive-possibly-change-server group server) - (nnwarchive-bind - (when (gnus-buffer-live-p nnwarchive-buffer) - (save-excursion - (set-buffer nnwarchive-buffer) - (kill-buffer nnwarchive-buffer))) - t)) + (when (and (not dont-check) nnwarchive-list-groups) + (funcall nnwarchive-list-groups (list group)) + (nnwarchive-write-groups)) + (let ((elem (assoc group nnwarchive-groups))) + (cond + ((not elem) + (nnheader-report 'nnwarchive "Group does not exist")) + (t + (nnheader-report 'nnwarchive "Opened group %s" group) + (nnheader-insert + "211 %d %d %d %s\n" (or (cadr elem) 0) 1 (or (cadr elem) 0) + (prin1-to-string group)) + t)))) (deffoo nnwarchive-request-article (article &optional group server buffer) (nnwarchive-possibly-change-server group server) - (nnwarchive-bind - (let (contents) - (save-excursion - (set-buffer nnwarchive-buffer) - (goto-char (point-min)) - (nnwarchive-url nnwarchive-article-url) - (setq contents (funcall nnwarchive-article-dissect))) - (when contents - (save-excursion - (set-buffer (or buffer nntp-server-buffer)) - (erase-buffer) - (insert contents) - (nnheader-report 'nnwarchive "Fetched article %s" article) - (cons group article)))))) + (nnwarchive-get-article article group server buffer)) (deffoo nnwarchive-close-server (&optional server) (when (and (nnwarchive-server-opened server) @@ -243,59 +269,48 @@ Read `mail-source-bind' for details." (save-excursion (set-buffer nnwarchive-buffer) (kill-buffer nnwarchive-buffer))) + (nnwarchive-backlog + (gnus-backlog-shutdown)) (nnoo-close-server 'nnwarchive server)) (deffoo nnwarchive-request-list (&optional server) (nnwarchive-possibly-change-server nil server) - (nnwarchive-bind - (save-excursion - (set-buffer nnwarchive-buffer) - (erase-buffer) - (if nnwarchive-list-url - (nnwarchive-url nnwarchive-list-url)) - (if nnwarchive-list-dissect - (funcall nnwarchive-list-dissect)) - (nnwarchive-write-groups) - (nnwarchive-generate-active))) - 'active) - -(deffoo nnwarchive-request-newgroups (date &optional server) - (nnwarchive-possibly-change-server nil server) - (nnwarchive-bind + (save-excursion + (set-buffer nnwarchive-buffer) + (erase-buffer) + (if nnwarchive-list-url + (nnwarchive-url nnwarchive-list-url)) + (if nnwarchive-list-dissect + (funcall nnwarchive-list-dissect)) (nnwarchive-write-groups) (nnwarchive-generate-active)) - 'active) - -(deffoo nnwarchive-asynchronous-p () - nil) - -(deffoo nnwarchive-server-opened (&optional server) - nnwarchive-opened) + t) (deffoo nnwarchive-open-server (server &optional defs connectionless) (nnwarchive-init server) (if (nnwarchive-server-opened server) t - (setq nnwarchive-login - (or nnwarchive-login - (read-string - (format "Login at %s: " server) - user-mail-address))) - (setq nnwarchive-passwd - (or nnwarchive-passwd - (mail-source-read-passwd - (format "Password for %s at %s: " nnwarchive-login server)))) - (nnwarchive-bind - (unless nnwarchive-groups - (nnwarchive-read-groups)) - (save-excursion - (set-buffer nnwarchive-buffer) - (erase-buffer) - (if nnwarchive-open-url + (nnoo-change-server 'nnwarchive server defs) + (when nnwarchive-authentication + (setq nnwarchive-login + (or nnwarchive-login + (read-string + (format "Login at %s: " server) + user-mail-address))) + (setq nnwarchive-passwd + (or nnwarchive-passwd + (mail-source-read-passwd + (format "Password for %s at %s: " + nnwarchive-login server))))) + (unless nnwarchive-groups + (nnwarchive-read-groups)) + (save-excursion + (set-buffer nnwarchive-buffer) + (erase-buffer) + (if nnwarchive-open-url (nnwarchive-url nnwarchive-open-url)) - (if nnwarchive-open-dissect - (funcall nnwarchive-open-dissect)) - (setq nnwarchive-opened t))) + (if nnwarchive-open-dissect + (funcall nnwarchive-open-dissect))) t)) (nnoo-define-skeleton nnwarchive) @@ -324,13 +339,28 @@ Read `mail-source-bind' for details." (defun nnwarchive-init (server) "Initialize buffers and such." + (let ((type (intern server)) (defs nnwarchive-type-definition) def) + (cond + ((equal server "") + (setq type nnwarchive-default-type)) + ((assq type nnwarchive-type-definition) t) + (t + (setq type nil) + (while (setq def (pop defs)) + (when (equal (cdr (assq 'address (cdr def))) server) + (setq defs nil) + (setq type (car def)))) + (unless type + (error "Undefined server %s" server)))) + (setq nnwarchive-type type)) (unless (file-exists-p nnwarchive-directory) (gnus-make-directory nnwarchive-directory)) (unless (gnus-buffer-live-p nnwarchive-buffer) (setq nnwarchive-buffer (save-excursion (nnheader-set-temp-buffer - (format " *nnwarchive %s %s*" nnwarchive-type server)))))) + (format " *nnwarchive %s %s*" nnwarchive-type server))))) + (nnwarchive-set-default nnwarchive-type)) (defun nnwarchive-encode-www-form-urlencoded (pairs) "Return PAIRS encoded for forms." @@ -367,42 +397,6 @@ Read `mail-source-bind' for details." (t (nnweb-insert (apply 'format (nnwarchive-eval xurl))))))) -(defun nnwarchive-decode-entities () - (goto-char (point-min)) - (while (re-search-forward "&\\(#[0-9]+\\|[a-z]+\\);" nil t) - (replace-match (char-to-string - (if (eq (aref (match-string 1) 0) ?\#) - (string-to-number (substring (match-string 1) 1)) - (or (cdr (assq (intern (match-string 1)) - w3-html-entities)) - ?#))) - t t))) - -(defun nnwarchive-decode-entities-string (str) - (with-temp-buffer - (insert str) - (nnwarchive-decode-entities) - (buffer-substring (point-min) (point-max)))) - -(defun nnwarchive-remove-markup () - (goto-char (point-min)) - (while (search-forward "" nil t) - (point-max)))) - (goto-char (point-min)) - (while (re-search-forward "<[^>]+>" nil t) - (replace-match "" t t))) - -(defun nnwarchive-date-to-date (sdate) - (let ((elem (split-string sdate))) - (concat (substring (nth 0 elem) 0 3) " " - (substring (nth 1 elem) 0 3) " " - (substring (nth 2 elem) 0 2) " " - (substring (nth 3 elem) 1 6) " " - (format-time-string "%Y") " " - (nth 4 elem)))) - (defun nnwarchive-generate-active () (save-excursion (set-buffer nntp-server-buffer) @@ -431,17 +425,17 @@ Read `mail-source-bind' for details." (nnwarchive-url nnwarchive-xover-last-url) (goto-char (point-min)) (when (re-search-forward "of \\([0-9]+\\)" nil t) - (setq articles (string-to-number (match-string 1)))) + (setq articles (string-to-number (match-string 1)))) (let ((elem (assoc group nnwarchive-groups))) - (if elem - (setcar (cdr elem) articles) - (push (list group articles "") nnwarchive-groups))) + (if elem + (setcar (cdr elem) articles) + (push (list group articles "") nnwarchive-groups))) (setq nnwarchive-headers (cdr (assoc group nnwarchive-headers-cache))) - (nnwarchive-egroups-xover) - (let ((elem (assoc group nnwarchive-headers-cache))) - (if elem - (setcdr elem nnwarchive-headers) - (push (cons group nnwarchive-headers) nnwarchive-headers-cache))))))) + (nnwarchive-egroups-xover group) + (let ((elem (assoc group nnwarchive-headers-cache))) + (if elem + (setcdr elem nnwarchive-headers) + (push (cons group nnwarchive-headers) nnwarchive-headers-cache))))))) (defun nnwarchive-egroups-list () (let ((case-fold-search t) @@ -458,41 +452,40 @@ Read `mail-source-bind' for details." (setq articles (string-to-number (match-string 1)))) (if (setq elem (assoc group nnwarchive-groups)) (setcar (cdr elem) articles) - (push (list group articles description) nnwarchive-groups))) - (nnwarchive-egroups-list-groups (mapcar 'identity nnwarchive-groups))) + (push (list group articles description) nnwarchive-groups)))) t) -(defun nnwarchive-egroups-xover() - (let (article subject from date group) +(defun nnwarchive-egroups-xover (group) + (let (article subject from date) (goto-char (point-min)) (while (re-search-forward "]+>\\([^<]+\\)<" nil t) - (setq group (match-string 1) - article (string-to-number (match-string 2)) - subject (match-string 3)) - (forward-line 1) - (unless (assq article nnwarchive-headers) - (if (looking-at "]+>]+>\\([^<]+\\)") - (setq from (match-string 1))) - (forward-line 1) - (if (looking-at "]+>]+>\\([^<]+\\)") - (setq date (identity (match-string 1)))) - (push (cons - article - (make-full-mail-header - article - (nnwarchive-decode-entities-string subject) - (nnwarchive-decode-entities-string from) - date - (concat "<" group "%" - (number-to-string article) - "@egroup.com>") - "" - 0 0 "")) nnwarchive-headers)))) + (setq group (match-string 1) + article (string-to-number (match-string 2)) + subject (match-string 3)) + (forward-line 1) + (unless (assq article nnwarchive-headers) + (if (looking-at "]+>]+>\\([^<]+\\)") + (setq from (match-string 1))) + (forward-line 1) + (if (looking-at "]+>]+>\\([^<]+\\)") + (setq date (identity (match-string 1)))) + (push (cons + article + (make-full-mail-header + article + (nnweb-decode-entities-string subject) + (nnweb-decode-entities-string from) + date + (concat "<" group "%" + (number-to-string article) + "@egroup.com>") + "" + 0 0 "")) nnwarchive-headers)))) nnwarchive-headers) -(defun nnwarchive-egroups-article () +(defun nnwarchive-egroups-article (group articles) (goto-char (point-min)) (if (search-forward "
" nil t)
       (delete-region (point-min) (point)))
@@ -502,8 +495,262 @@ Read `mail-source-bind' for details."
   (goto-char (point-min))
   (while (re-search-forward "]+>\\([^<]+\\)" nil t)
     (replace-match "<\\1>"))
-  (nnwarchive-decode-entities)
-  (buffer-substring (point-min) (point-max)))
+  (nnweb-decode-entities)
+  (buffer-string))
+
+(defun nnwarchive-egroups-xover-files (group articles)
+  (let (aux auxs)
+    (setq auxs (nnwarchive-paged (sort articles '<)))
+    (while (setq aux (pop auxs))
+      (goto-char (point-max))
+      (nnwarchive-url nnwarchive-xover-url))
+    (if nnwarchive-xover-dissect
+	(nnwarchive-egroups-xover group))))
+
+;; mail-archive
+
+(defun nnwarchive-mail-archive-list-groups (groups)
+  (save-excursion
+    (let (articles)
+      (set-buffer nnwarchive-buffer)
+      (dolist (group groups)
+	(erase-buffer)
+	(nnwarchive-url nnwarchive-xover-last-url)
+	(goto-char (point-min))
+	(when (re-search-forward "msg\\([0-9]+\\)\\.html" nil t)
+	  (setq articles (1+ (string-to-number (match-string 1)))))
+	(let ((elem (assoc group nnwarchive-groups)))
+	  (if elem
+	      (setcar (cdr elem) articles)
+	    (push (list group articles "") nnwarchive-groups)))
+	(setq nnwarchive-headers (cdr (assoc group nnwarchive-headers-cache)))
+	(nnwarchive-mail-archive-xover group)
+	(let ((elem (assoc group nnwarchive-headers-cache)))
+	  (if elem
+	      (setcdr elem nnwarchive-headers)
+	    (push (cons group nnwarchive-headers) 
+		  nnwarchive-headers-cache)))))))
+
+(defun nnwarchive-mail-archive-list ()
+  (let ((case-fold-search t)
+	group description elem articles)
+    (goto-char (point-min))
+    (while (re-search-forward "\\([^>]+\\)<" nil t)
+      (setq group (match-string 1)
+	    description (match-string 2))
+      (forward-line 1)
+      (setq articles 0)
+      (if (setq elem (assoc group nnwarchive-groups))
+	  (setcar (cdr elem) articles)
+	(push (list group articles description) nnwarchive-groups))))
+  t)
+
+(defun nnwarchive-mail-archive-xover (group)
+  (let (article subject from date)
+    (goto-char (point-min))
+    (while (re-search-forward
+	    "]*HREF=\"msg\\([0-9]+\\)\\.html[^>]+>\\([^<]+\\)<"
+	    nil t)
+      (setq article (1+ (string-to-number (match-string 1)))
+	    subject (match-string 2))
+      (forward-line 1)
+      (unless (assq article nnwarchive-headers)
+	(if (looking-at "