--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/gnus/nnbabyl.el	Mon Aug 13 08:45:50 2007 +0200
@@ -0,0 +1,625 @@
+;;; nnbabyl.el --- rmail mbox access for Gnus
+;; Copyright (C) 1995,96 Free Software Foundation, Inc.
+
+;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; 	Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
+;; Keywords: news, mail
+
+;; 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:
+
+;; For an overview of what the interface functions do, please see the
+;; Gnus sources.  
+
+;;; Code:
+
+(require 'nnheader)
+(require 'rmail)
+(require 'nnmail)
+(require 'nnoo)
+(eval-when-compile (require 'cl))
+
+(nnoo-declare nnbabyl)
+
+(defvoo nnbabyl-mbox-file (expand-file-name "~/RMAIL")
+  "The name of the rmail box file in the users home directory.")
+
+(defvoo nnbabyl-active-file (expand-file-name "~/.rmail-active")
+  "The name of the active file for the rmail box.")
+
+(defvoo nnbabyl-get-new-mail t
+  "If non-nil, nnbabyl will check the incoming mail file and split the mail.")
+
+(defvoo nnbabyl-prepare-save-mail-hook nil
+  "Hook run narrowed to an article before saving.")
+
+
+
+(defvar nnbabyl-mail-delimiter "\^_")
+
+(defconst nnbabyl-version "nnbabyl 1.0"
+  "nnbabyl version.")
+
+(defvoo nnbabyl-mbox-buffer nil)
+(defvoo nnbabyl-current-group nil)
+(defvoo nnbabyl-status-string "")
+(defvoo nnbabyl-group-alist nil)
+(defvoo nnbabyl-active-timestamp nil)
+
+(defvoo nnbabyl-previous-buffer-mode nil)
+
+(eval-and-compile
+  (autoload 'gnus-set-text-properties "gnus-ems"))
+
+
+
+;;; Interface functions
+
+(nnoo-define-basics nnbabyl)
+
+(deffoo nnbabyl-retrieve-headers (articles &optional group server fetch-old)
+  (save-excursion
+    (set-buffer nntp-server-buffer)
+    (erase-buffer)
+    (let ((number (length articles))
+	  (count 0)
+	  (delim (concat "^" nnbabyl-mail-delimiter))
+	  article art-string start stop)
+      (nnbabyl-possibly-change-newsgroup group server)
+      (while (setq article (pop articles))
+	(setq art-string (nnbabyl-article-string article))
+	(set-buffer nnbabyl-mbox-buffer)
+	(beginning-of-line)
+	(when (or (search-forward art-string nil t)
+		  (search-backward art-string nil t))
+	  (re-search-backward delim nil t)
+	  (while (and (not (looking-at ".+:"))
+		      (zerop (forward-line 1))))
+	  (setq start (point))
+	  (search-forward "\n\n" nil t)
+	  (setq stop (1- (point)))
+	  (set-buffer nntp-server-buffer)
+	  (insert "221 ")
+	  (princ article (current-buffer))
+	  (insert " Article retrieved.\n")
+	  (insert-buffer-substring nnbabyl-mbox-buffer start stop)
+	  (goto-char (point-max))
+	  (insert ".\n"))
+	(and (numberp nnmail-large-newsgroup)
+	     (> number nnmail-large-newsgroup)
+	     (zerop (% (incf count) 20))
+	     (nnheader-message 5 "nnbabyl: Receiving headers... %d%%"
+			       (/ (* count 100) number))))
+
+      (and (numberp nnmail-large-newsgroup)
+	   (> number nnmail-large-newsgroup)
+	   (nnheader-message 5 "nnbabyl: Receiving headers...done"))
+
+      (set-buffer nntp-server-buffer)
+      (nnheader-fold-continuation-lines)
+      'headers)))
+
+(deffoo nnbabyl-open-server (server &optional defs)
+  (nnoo-change-server 'nnbabyl server defs)
+  (cond 
+   ((not (file-exists-p nnbabyl-mbox-file))
+    (nnbabyl-close-server)
+    (nnheader-report 'nnbabyl "No such file: %s" nnbabyl-mbox-file))
+   ((file-directory-p nnbabyl-mbox-file)
+    (nnbabyl-close-server)
+    (nnheader-report 'nnbabyl "Not a regular file: %s" nnbabyl-mbox-file))
+   (t
+    (nnheader-report 'nnbabyl "Opened server %s using mbox %s" server
+		     nnbabyl-mbox-file)
+    t)))
+
+(deffoo nnbabyl-close-server (&optional server)
+  ;; Restore buffer mode.
+  (when (and (nnbabyl-server-opened)
+	     nnbabyl-previous-buffer-mode)
+    (save-excursion
+      (set-buffer nnbabyl-mbox-buffer)
+      (narrow-to-region
+       (caar nnbabyl-previous-buffer-mode)
+       (cdar nnbabyl-previous-buffer-mode))
+      (funcall (cdr nnbabyl-previous-buffer-mode))))
+  (nnoo-close-server 'nnbabyl server)
+  (setq nnbabyl-mbox-buffer nil)
+  t)
+
+(deffoo nnbabyl-server-opened (&optional server)
+  (and (nnoo-current-server-p 'nnbabyl server)
+       nnbabyl-mbox-buffer
+       (buffer-name nnbabyl-mbox-buffer)
+       nntp-server-buffer
+       (buffer-name nntp-server-buffer)))
+
+(deffoo nnbabyl-request-article (article &optional newsgroup server buffer)
+  (nnbabyl-possibly-change-newsgroup newsgroup server)
+  (save-excursion
+    (set-buffer nnbabyl-mbox-buffer)
+    (goto-char (point-min))
+    (when (search-forward (nnbabyl-article-string article) nil t)
+      (let (start stop summary-line)
+	(re-search-backward (concat "^" nnbabyl-mail-delimiter) nil t)
+	(while (and (not (looking-at ".+:"))
+		    (zerop (forward-line 1))))
+	(setq start (point))
+	(or (and (re-search-forward 
+		  (concat "^" nnbabyl-mail-delimiter) nil t)
+		 (forward-line -1))
+	    (goto-char (point-max)))
+	(setq stop (point))
+	(let ((nntp-server-buffer (or buffer nntp-server-buffer)))
+	  (set-buffer nntp-server-buffer)
+	  (erase-buffer)
+	  (insert-buffer-substring nnbabyl-mbox-buffer start stop)
+	  (goto-char (point-min))
+	  ;; If there is an EOOH header, then we have to remove some
+	  ;; duplicated headers. 
+	  (setq summary-line (looking-at "Summary-line:"))
+	  (when (search-forward "\n*** EOOH ***" nil t)
+	    (if summary-line
+		;; The headers to be deleted are located before the
+		;; EOOH line...
+		(delete-region (point-min) (progn (forward-line 1)
+						  (point)))
+	      ;; ...or after.
+	      (delete-region (progn (beginning-of-line) (point))
+			     (or (search-forward "\n\n" nil t)
+				 (point)))))
+	  (if (numberp article) 
+	      (cons nnbabyl-current-group article)
+	    (nnbabyl-article-group-number)))))))
+
+(deffoo nnbabyl-request-group (group &optional server dont-check)
+  (let ((active (cadr (assoc group nnbabyl-group-alist))))
+    (save-excursion
+      (cond 
+       ((or (null active)
+	    (null (nnbabyl-possibly-change-newsgroup group server)))
+	(nnheader-report 'nnbabyl "No such group: %s" group))
+       (dont-check
+	(nnheader-report 'nnbabyl "Selected group %s" group)
+	(nnheader-insert ""))
+       (t
+	(nnheader-report 'nnbabyl "Selected group %s" group)
+	(nnheader-insert "211 %d %d %d %s\n" 
+			 (1+ (- (cdr active) (car active)))
+			 (car active) (cdr active) group))))))
+
+(deffoo nnbabyl-request-scan (&optional group server)
+  (nnbabyl-read-mbox)
+  (nnmail-get-new-mail 
+   'nnbabyl 
+   (lambda ()
+     (save-excursion
+       (set-buffer nnbabyl-mbox-buffer)
+       (save-buffer)))
+   nnbabyl-mbox-file group
+   (lambda ()
+     (save-excursion
+       (let ((in-buf (current-buffer)))
+	 (goto-char (point-min))
+	 (while (search-forward "\n\^_\n" nil t)
+	   (delete-char -1))
+	 (set-buffer nnbabyl-mbox-buffer)
+	 (goto-char (point-max))
+	 (search-backward "\n\^_" nil t)
+	 (goto-char (match-end 0))
+	 (insert-buffer-substring in-buf)))
+     (nnmail-save-active nnbabyl-group-alist nnbabyl-active-file))))
+
+(deffoo nnbabyl-close-group (group &optional server)
+  t)
+
+(deffoo nnbabyl-request-create-group (group &optional server) 
+  (nnmail-activate 'nnbabyl)
+  (unless (assoc group nnbabyl-group-alist)
+    (setq nnbabyl-group-alist (cons (list group (cons 1 0))
+				    nnbabyl-group-alist))
+    (nnmail-save-active nnbabyl-group-alist nnbabyl-active-file))
+  t)
+
+(deffoo nnbabyl-request-list (&optional server)
+  (save-excursion
+    (nnmail-find-file nnbabyl-active-file)
+    (setq nnbabyl-group-alist (nnmail-get-active))))
+
+(deffoo nnbabyl-request-newgroups (date &optional server)
+  (nnbabyl-request-list server))
+
+(deffoo nnbabyl-request-list-newsgroups (&optional server)
+  (nnheader-report 'nnbabyl "nnbabyl: LIST NEWSGROUPS is not implemented."))
+
+(deffoo nnbabyl-request-expire-articles
+  (articles newsgroup &optional server force)
+  (nnbabyl-possibly-change-newsgroup newsgroup server)
+  (let* ((is-old t)
+	 rest)
+    (nnmail-activate 'nnbabyl)
+
+    (save-excursion 
+      (set-buffer nnbabyl-mbox-buffer)
+      (gnus-set-text-properties (point-min) (point-max) nil)
+      (while (and articles is-old)
+	(goto-char (point-min))
+	(if (search-forward (nnbabyl-article-string (car articles)) nil t)
+	    (if (setq is-old
+		      (nnmail-expired-article-p
+		       newsgroup
+		       (buffer-substring 
+			(point) (progn (end-of-line) (point))) force))
+		(progn
+		  (nnheader-message 5 "Deleting article %d in %s..." 
+				    (car articles) newsgroup)
+		  (nnbabyl-delete-mail))
+	      (setq rest (cons (car articles) rest))))
+	(setq articles (cdr articles)))
+      (save-buffer)
+      ;; Find the lowest active article in this group.
+      (let ((active (nth 1 (assoc newsgroup nnbabyl-group-alist))))
+	(goto-char (point-min))
+	(while (and (not (search-forward
+			  (nnbabyl-article-string (car active)) nil t))
+		    (<= (car active) (cdr active)))
+	  (setcar active (1+ (car active)))
+	  (goto-char (point-min))))
+      (nnmail-save-active nnbabyl-group-alist nnbabyl-active-file)
+      (nconc rest articles))))
+
+(deffoo nnbabyl-request-move-article 
+  (article group server accept-form &optional last)
+  (nnbabyl-possibly-change-newsgroup group server)
+  (let ((buf (get-buffer-create " *nnbabyl move*"))
+	result)
+    (and 
+     (nnbabyl-request-article article group server)
+     (save-excursion
+       (set-buffer buf)
+       (insert-buffer-substring nntp-server-buffer)
+       (goto-char (point-min))
+       (if (re-search-forward 
+	    "^X-Gnus-Newsgroup:" 
+	    (save-excursion (search-forward "\n\n" nil t) (point)) t)
+	   (delete-region (progn (beginning-of-line) (point))
+			  (progn (forward-line 1) (point))))
+       (setq result (eval accept-form))
+       (kill-buffer (current-buffer))
+       result)
+     (save-excursion
+       (set-buffer nnbabyl-mbox-buffer)
+       (goto-char (point-min))
+       (if (search-forward (nnbabyl-article-string article) nil t)
+	   (nnbabyl-delete-mail))
+       (and last (save-buffer))))
+    result))
+
+(deffoo nnbabyl-request-accept-article (group &optional server last)
+  (nnbabyl-possibly-change-newsgroup group server)
+  (nnmail-check-syntax)
+  (let ((buf (current-buffer))
+	result beg)
+    (and 
+     (nnmail-activate 'nnbabyl)
+     (save-excursion
+       (goto-char (point-min))
+       (search-forward "\n\n" nil t)
+       (forward-line -1)
+       (save-excursion
+	 (while (re-search-backward "^X-Gnus-Newsgroup: " beg t)
+	   (delete-region (point) (progn (forward-line 1) (point)))))
+       (let ((nnmail-split-methods
+	      (if (stringp group) (list (list group "")) 
+		nnmail-split-methods)))
+	 (setq result (car (nnbabyl-save-mail))))
+       (set-buffer nnbabyl-mbox-buffer)
+       (goto-char (point-max))
+       (search-backward "\n\^_")
+       (goto-char (match-end 0))
+       (insert-buffer-substring buf)
+       (when last
+	 (save-buffer)
+	 (nnmail-save-active nnbabyl-group-alist nnbabyl-active-file))
+       result))))
+
+(deffoo nnbabyl-request-replace-article (article group buffer)
+  (nnbabyl-possibly-change-newsgroup group)
+  (save-excursion
+    (set-buffer nnbabyl-mbox-buffer)
+    (goto-char (point-min))
+    (if (not (search-forward (nnbabyl-article-string article) nil t))
+	nil
+      (nnbabyl-delete-mail t t)
+      (insert-buffer-substring buffer)
+      (save-buffer)
+      t)))
+
+(deffoo nnbabyl-request-delete-group (group &optional force server)
+  (nnbabyl-possibly-change-newsgroup group server)
+  ;; Delete all articles in GROUP.
+  (if (not force)
+      ()				; Don't delete the articles.
+    (save-excursion
+      (set-buffer nnbabyl-mbox-buffer)
+      (goto-char (point-min))
+      ;; Delete all articles in this group.
+      (let ((ident (concat "\nX-Gnus-Newsgroup: " nnbabyl-current-group ":"))
+	    found)
+	(while (search-forward ident nil t)
+	  (setq found t)
+	  (nnbabyl-delete-mail))
+	(and found (save-buffer)))))
+  ;; Remove the group from all structures.
+  (setq nnbabyl-group-alist 
+	(delq (assoc group nnbabyl-group-alist) nnbabyl-group-alist)
+	nnbabyl-current-group nil)
+  ;; Save the active file.
+  (nnmail-save-active nnbabyl-group-alist nnbabyl-active-file)
+  t)
+
+(deffoo nnbabyl-request-rename-group (group new-name &optional server)
+  (nnbabyl-possibly-change-newsgroup group server)
+  (save-excursion
+    (set-buffer nnbabyl-mbox-buffer)
+    (goto-char (point-min))
+    (let ((ident (concat "\nX-Gnus-Newsgroup: " nnbabyl-current-group ":"))
+	  (new-ident (concat "\nX-Gnus-Newsgroup: " new-name ":"))
+	  found)
+      (while (search-forward ident nil t)
+	(replace-match new-ident t t)
+	(setq found t))
+      (and found (save-buffer))))
+  (let ((entry (assoc group nnbabyl-group-alist)))
+    (and entry (setcar entry new-name))
+    (setq nnbabyl-current-group nil)
+    ;; Save the new group alist.
+    (nnmail-save-active nnbabyl-group-alist nnbabyl-active-file)
+    t))
+
+
+;;; Internal functions.
+
+;; If FORCE, delete article no matter how many X-Gnus-Newsgroup
+;; headers there are. If LEAVE-DELIM, don't delete the Unix mbox
+;; delimiter line.
+(defun nnbabyl-delete-mail (&optional force leave-delim)
+  ;; Delete the current X-Gnus-Newsgroup line.
+  (or force
+      (delete-region
+       (progn (beginning-of-line) (point))
+       (progn (forward-line 1) (point))))
+  ;; Beginning of the article.
+  (save-excursion
+    (save-restriction
+      (widen)
+      (narrow-to-region
+       (save-excursion
+	 (re-search-backward (concat "^" nnbabyl-mail-delimiter) nil t)
+	 (if leave-delim (progn (forward-line 1) (point))
+	   (match-beginning 0)))
+       (progn
+	 (forward-line 1)
+	 (or (and (re-search-forward (concat "^" nnbabyl-mail-delimiter) 
+				     nil t)
+		  (if (and (not (bobp)) leave-delim)
+		      (progn (forward-line -2) (point))
+		    (match-beginning 0)))
+	     (point-max))))
+      (goto-char (point-min))
+      ;; Only delete the article if no other groups owns it as well.
+      (if (or force (not (re-search-forward "^X-Gnus-Newsgroup: " nil t)))
+	  (delete-region (point-min) (point-max))))))
+
+(defun nnbabyl-possibly-change-newsgroup (newsgroup &optional server)
+  (when (and server 
+	     (not (nnbabyl-server-opened server)))
+    (nnbabyl-open-server server))
+  (if (or (not nnbabyl-mbox-buffer)
+	  (not (buffer-name nnbabyl-mbox-buffer)))
+      (save-excursion (nnbabyl-read-mbox)))
+  (or nnbabyl-group-alist
+      (nnmail-activate 'nnbabyl))
+  (if newsgroup
+      (if (assoc newsgroup nnbabyl-group-alist)
+	  (setq nnbabyl-current-group newsgroup)
+	(nnheader-report 'nnbabyl "No such group in file"))
+    t))
+
+(defun nnbabyl-article-string (article)
+  (if (numberp article)
+      (concat "\nX-Gnus-Newsgroup: " nnbabyl-current-group ":" 
+	      (int-to-string article) " ")
+    (concat "\nMessage-ID: " article)))
+
+(defun nnbabyl-article-group-number ()
+  (save-excursion
+    (goto-char (point-min))
+    (and (re-search-forward "^X-Gnus-Newsgroup: +\\([^:]+\\):\\([0-9]+\\) "
+			    nil t)
+	 (cons (buffer-substring (match-beginning 1) (match-end 1))
+	       (string-to-int
+		(buffer-substring (match-beginning 2) (match-end 2)))))))
+
+(defun nnbabyl-insert-lines ()
+  "Insert how many lines and chars there are in the body of the mail."
+  (let (lines chars)
+    (save-excursion
+      (goto-char (point-min))
+      (when (search-forward "\n\n" nil t) 
+	;; There may be an EOOH line here...
+	(when (looking-at "\\*\\*\\* EOOH \\*\\*\\*")
+	  (search-forward "\n\n" nil t))
+	(setq chars (- (point-max) (point))
+	      lines (max (- (count-lines (point) (point-max)) 1) 0))
+	;; Move back to the end of the headers. 
+	(goto-char (point-min))
+	(search-forward "\n\n" nil t)
+	(forward-char -1)
+	(save-excursion
+	  (when (re-search-backward "^Lines: " nil t)
+	    (delete-region (point) (progn (forward-line 1) (point)))))
+	(insert (format "Lines: %d\n" lines))
+	chars))))
+
+(defun nnbabyl-save-mail ()
+  ;; Called narrowed to an article.
+  (let ((group-art (nreverse (nnmail-article-group 'nnbabyl-active-number))))
+    (nnbabyl-insert-lines)
+    (nnmail-insert-xref group-art)
+    (nnbabyl-insert-newsgroup-line group-art)
+    (run-hooks 'nnbabyl-prepare-save-mail-hook)
+    group-art))
+
+(defun nnbabyl-insert-newsgroup-line (group-art)
+  (save-excursion
+    (goto-char (point-min))
+    (while (looking-at "From ")
+      (replace-match "Mail-from: From " t t)
+      (forward-line 1))
+    ;; If there is a C-l at the beginning of the narrowed region, this
+    ;; isn't really a "save", but rather a "scan".
+    (goto-char (point-min))
+    (or (looking-at "\^L")
+	(save-excursion
+	  (insert "\^L\n0, unseen,,\n*** EOOH ***\n")
+	  (goto-char (point-max))
+	  (insert "\^_\n")))
+    (if (search-forward "\n\n" nil t)
+	(progn
+	  (forward-char -1)
+	  (while group-art
+	    (insert (format "X-Gnus-Newsgroup: %s:%d   %s\n" 
+			    (caar group-art) (cdar group-art)
+			    (current-time-string)))
+	    (setq group-art (cdr group-art)))))
+    t))
+
+(defun nnbabyl-active-number (group)
+  ;; Find the next article number in GROUP.
+  (let ((active (cadr (assoc group nnbabyl-group-alist))))
+    (if active
+	(setcdr active (1+ (cdr active)))
+      ;; This group is new, so we create a new entry for it.
+      ;; This might be a bit naughty... creating groups on the drop of
+      ;; a hat, but I don't know...
+      (setq nnbabyl-group-alist (cons (list group (setq active (cons 1 1)))
+				      nnbabyl-group-alist)))
+    (cdr active)))
+
+(defun nnbabyl-read-mbox ()
+  (nnmail-activate 'nnbabyl)
+  (unless (file-exists-p nnbabyl-mbox-file)
+    ;; Create a new, empty RMAIL mbox file.
+    (save-excursion
+      (set-buffer (setq nnbabyl-mbox-buffer
+			(create-file-buffer nnbabyl-mbox-file)))
+      (setq buffer-file-name nnbabyl-mbox-file)
+      (insert "BABYL OPTIONS:\n\n\^_")
+      (write-region (point-min) (point-max) nnbabyl-mbox-file t 'nomesg)))
+
+  (if (and nnbabyl-mbox-buffer
+	   (buffer-name nnbabyl-mbox-buffer)
+	   (save-excursion
+	     (set-buffer nnbabyl-mbox-buffer)
+	     (= (buffer-size) (nth 7 (file-attributes nnbabyl-mbox-file)))))
+      () ; This buffer hasn't changed since we read it last.  Possibly.
+    (save-excursion
+      (let ((delim (concat "^" nnbabyl-mail-delimiter))
+	    (alist nnbabyl-group-alist)
+	    start end number)
+	(set-buffer (setq nnbabyl-mbox-buffer 
+			  (nnheader-find-file-noselect 
+			   nnbabyl-mbox-file nil 'raw)))
+	;; Save previous buffer mode.
+	(setq nnbabyl-previous-buffer-mode 
+	      (cons (cons (point-min) (point-max))
+		    major-mode))
+
+	(buffer-disable-undo (current-buffer))
+	(widen)
+	(setq buffer-read-only nil)
+	(fundamental-mode)
+
+	;; Go through the group alist and compare against
+	;; the rmail file.
+	(while alist
+	  (goto-char (point-max))
+	  (when (and (re-search-backward
+		      (format "^X-Gnus-Newsgroup: %s:\\([0-9]+\\) "
+			      (caar alist)) nil t)
+		     (> (setq number
+			      (string-to-number 
+			       (buffer-substring
+				(match-beginning 1) (match-end 1))))
+			(cdadar alist)))
+	    (setcdr (cadar alist) (1+ number)))
+	  (setq alist (cdr alist)))
+	
+	;; We go through the mbox and make sure that each and 
+	;; every mail belongs to some group or other.
+	(goto-char (point-min))
+	(re-search-forward delim nil t)
+	(setq start (match-end 0))
+	(while (re-search-forward delim nil t)
+	  (setq end (match-end 0))
+	  (unless (search-backward "\nX-Gnus-Newsgroup: " start t)
+	    (goto-char end)
+	    (save-excursion
+	      (save-restriction
+		(narrow-to-region (goto-char start) end)
+		(nnbabyl-save-mail)
+		(setq end (point-max)))))
+	  (goto-char (setq start end)))
+	(when (buffer-modified-p (current-buffer))
+	  (save-buffer))
+	(nnmail-save-active nnbabyl-group-alist nnbabyl-active-file)))))
+
+(defun nnbabyl-remove-incoming-delims ()
+  (goto-char (point-min))
+  (while (search-forward "\^_" nil t)
+    (replace-match "?" t t)))
+
+(defun nnbabyl-check-mbox ()
+  "Go through the nnbabyl mbox and make sure that no article numbers are reused."
+  (interactive)
+  (let ((idents (make-vector 1000 0))
+	id)
+    (save-excursion
+      (when (or (not nnbabyl-mbox-buffer)
+		(not (buffer-name nnbabyl-mbox-buffer)))
+	(nnbabyl-read-mbox))
+      (set-buffer nnbabyl-mbox-buffer)
+      (goto-char (point-min))
+      (while (re-search-forward "^X-Gnus-Newsgroup: \\([^ ]+\\) "  nil t)
+	(if (intern-soft (setq id (match-string 1)) idents)
+	    (progn
+	      (delete-region (progn (beginning-of-line) (point))
+			     (progn (forward-line 1) (point)))
+	      (nnheader-message 7 "Moving %s..." id)
+	      (nnbabyl-save-mail))
+	  (intern id idents)))
+      (when (buffer-modified-p (current-buffer))
+	(save-buffer))
+      (nnmail-save-active nnbabyl-group-alist nnbabyl-active-file)
+      (message ""))))
+
+(provide 'nnbabyl)
+
+;;; nnbabyl.el ends here