--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/gnus/nnkiboze.el	Mon Aug 13 08:45:50 2007 +0200
@@ -0,0 +1,388 @@
+;;; nnkiboze.el --- select virtual news access for Gnus
+;; Copyright (C) 1995,96 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:
+
+;; The other access methods (nntp, nnspool, etc) are general news
+;; access methods. This module relies on Gnus and can not be used
+;; separately.
+
+;;; Code:
+
+(require 'nntp)
+(require 'nnheader)
+(require 'gnus)
+(require 'gnus-score)
+(require 'nnoo)
+(eval-when-compile (require 'cl))
+
+(nnoo-declare nnkiboze)
+(defvoo nnkiboze-directory gnus-directory
+  "nnkiboze will put its files in this directory.")
+
+(defvoo nnkiboze-level 9
+  "*The maximum level to be searched for articles.")
+
+(defvoo nnkiboze-remove-read-articles t
+  "*If non-nil, nnkiboze will remove read articles from the kiboze group.")
+
+
+
+(defconst nnkiboze-version "nnkiboze 1.0"
+  "Version numbers of this version of nnkiboze.")
+
+(defvoo nnkiboze-current-group nil)
+(defvoo nnkiboze-current-score-group "")
+(defvoo nnkiboze-status-string "")
+
+
+
+;;; Interface functions.
+
+(nnoo-define-basics nnkiboze)
+
+(deffoo nnkiboze-retrieve-headers (articles &optional group server fetch-old)
+  (nnkiboze-possibly-change-newsgroups group)
+  (if gnus-nov-is-evil
+      nil
+    (if (stringp (car articles))
+	'headers
+      (let ((first (car articles))
+	    (last (progn (while (cdr articles) (setq articles (cdr articles)))
+			 (car articles)))
+	    (nov (nnkiboze-nov-file-name)))
+	(if (file-exists-p nov)
+	    (save-excursion
+	      (set-buffer nntp-server-buffer)
+	      (erase-buffer)
+	      (insert-file-contents nov)
+	      (goto-char (point-min))
+	      (while (and (not (eobp)) (< first (read (current-buffer))))
+		(forward-line 1))
+	      (beginning-of-line)
+	      (if (not (eobp)) (delete-region 1 (point)))
+	      (while (and (not (eobp)) (>= last (read (current-buffer))))
+		(forward-line 1))
+	      (beginning-of-line)
+	      (if (not (eobp)) (delete-region (point) (point-max)))
+	      'nov))))))
+
+(deffoo nnkiboze-open-server (newsgroups &optional something)
+  (gnus-make-directory nnkiboze-directory)
+  (nnheader-init-server-buffer))
+
+(deffoo nnkiboze-server-opened (&optional server)
+  (and nntp-server-buffer
+       (get-buffer nntp-server-buffer)))
+
+(deffoo nnkiboze-request-article (article &optional newsgroup server buffer)
+  (nnkiboze-possibly-change-newsgroups newsgroup)
+  (if (not (numberp article))
+      ;; This is a real kludge. It might not work at times, but it
+      ;; does no harm I think. The only alternative is to offer no
+      ;; article fetching by message-id at all.
+      (nntp-request-article article newsgroup gnus-nntp-server buffer)
+    (let* ((header (gnus-summary-article-header article))
+	   (xref (mail-header-xref header))
+	   igroup iarticle)
+      (or xref (error "nnkiboze: No xref"))
+      (or (string-match " \\([^ ]+\\):\\([0-9]+\\)" xref)
+	  (error "nnkiboze: Malformed xref"))
+      (setq igroup (substring xref (match-beginning 1) (match-end 1)))
+      (setq iarticle (string-to-int 
+		      (substring xref (match-beginning 2) (match-end 2))))
+      (and (gnus-request-group igroup t)
+	   (gnus-request-article iarticle igroup buffer)))))
+
+(deffoo nnkiboze-request-group (group &optional server dont-check)
+  "Make GROUP the current newsgroup."
+  (nnkiboze-possibly-change-newsgroups group)
+  (if dont-check
+      ()
+    (let ((nov-file (nnkiboze-nov-file-name))
+	  beg end total)
+      (save-excursion
+	(set-buffer nntp-server-buffer)
+	(erase-buffer)
+	(if (not (file-exists-p nov-file))
+	    (insert (format "211 0 0 0 %s\n" group))
+	  (insert-file-contents nov-file)
+	  (if (zerop (buffer-size))
+	      (insert (format "211 0 0 0 %s\n" group))
+	    (goto-char (point-min))
+	    (and (looking-at "[0-9]+") (setq beg (read (current-buffer))))
+	    (goto-char (point-max))
+	    (and (re-search-backward "^[0-9]" nil t)
+		 (setq end (read (current-buffer))))
+	    (setq total (count-lines (point-min) (point-max)))
+	    (erase-buffer)
+	    (insert (format "211 %d %d %d %s\n" total beg end group)))))))
+  t)
+
+(deffoo nnkiboze-close-group (group &optional server)
+  (nnkiboze-possibly-change-newsgroups group)
+  ;; Remove NOV lines of articles that are marked as read.
+  (when (and (file-exists-p (nnkiboze-nov-file-name))
+	     nnkiboze-remove-read-articles
+	     (eq major-mode 'gnus-summary-mode))
+    (save-excursion
+      (let ((unreads gnus-newsgroup-unreads)
+	    (unselected gnus-newsgroup-unselected)
+            (version-control 'never))
+	(set-buffer (get-buffer-create "*nnkiboze work*"))
+	(buffer-disable-undo (current-buffer))
+	(erase-buffer)
+	(let ((cur (current-buffer))
+	      article)
+	  (insert-file-contents (nnkiboze-nov-file-name))
+	  (goto-char (point-min))
+	  (while (looking-at "[0-9]+")
+	    (if (or (memq (setq article (read cur)) unreads)
+		    (memq article unselected))
+		(forward-line 1)
+	      (delete-region (progn (beginning-of-line) (point))
+			     (progn (forward-line 1) (point)))))
+	  (write-file (nnkiboze-nov-file-name))
+	  (kill-buffer (current-buffer)))))
+    (setq nnkiboze-current-group nil)))
+
+(deffoo nnkiboze-request-list (&optional server) 
+  (nnheader-report 'nnkiboze "LIST is not implemented."))
+
+(deffoo nnkiboze-request-newgroups (date &optional server)
+  "List new groups."
+  (nnheader-report 'nnkiboze "NEWGROUPS is not supported."))
+
+(deffoo nnkiboze-request-list-newsgroups (&optional server)
+  (nnheader-report 'nnkiboze "LIST NEWSGROUPS is not implemented."))
+
+(deffoo nnkiboze-request-delete-group (group &optional force server)
+  (nnkiboze-possibly-change-newsgroups group)
+  (when force
+     (let ((files (list (nnkiboze-nov-file-name)
+			(concat nnkiboze-directory group ".newsrc")
+			(nnkiboze-score-file group))))
+       (while files
+	 (and (file-exists-p (car files))
+	      (file-writable-p (car files))
+	      (delete-file (car files)))
+	 (setq files (cdr files)))))
+  (setq nnkiboze-current-group nil))
+
+
+;;; Internal functions.
+
+(defun nnkiboze-possibly-change-newsgroups (group)
+  (setq nnkiboze-current-group group))
+
+(defun nnkiboze-prefixed-name (group)
+  (gnus-group-prefixed-name group '(nnkiboze "")))
+
+;;;###autoload
+(defun nnkiboze-generate-groups ()
+  "Usage: emacs -batch -l nnkiboze -f nnkiboze-generate-groups
+Finds out what articles are to be part of the nnkiboze groups."
+  (interactive)
+  (let ((nnmail-spool-file nil)
+	(gnus-use-dribble-file nil)
+	(gnus-read-active-file t)
+	(gnus-expert-user t))
+    (gnus))
+  (let* ((gnus-newsrc-alist (gnus-copy-sequence gnus-newsrc-alist))
+	 (newsrc gnus-newsrc-alist)
+	 gnus-newsrc-hashtb)
+    (gnus-make-hashtable-from-newsrc-alist)
+    ;; We have copied all the newsrc alist info over to local copies
+    ;; so that we can mess all we want with these lists.
+    (while newsrc
+      (if (string-match "nnkiboze" (caar newsrc))
+	  ;; For each kiboze group, we call this function to generate
+	  ;; it.  
+	  (nnkiboze-generate-group (caar newsrc)))
+      (setq newsrc (cdr newsrc)))))
+
+(defun nnkiboze-score-file (group)
+  (list (expand-file-name
+	 (concat (file-name-as-directory gnus-kill-files-directory)
+		 (nnheader-translate-file-chars
+		  (concat nnkiboze-current-score-group 
+			  "." gnus-score-file-suffix))))))
+
+(defun nnkiboze-generate-group (group) 
+  (let* ((info (nth 2 (gnus-gethash group gnus-newsrc-hashtb)))
+	 (newsrc-file (concat nnkiboze-directory group ".newsrc"))
+	 (nov-file (concat nnkiboze-directory group ".nov"))
+	 (regexp (nth 1 (nth 4 info)))
+	 (gnus-expert-user t)
+	 (gnus-large-newsgroup nil)
+	 (version-control 'never)
+	 (gnus-score-find-score-files-function 'nnkiboze-score-file)
+ 	 gnus-select-group-hook gnus-summary-prepare-hook 
+	 gnus-thread-sort-functions gnus-show-threads 
+	 gnus-visual
+	 method nnkiboze-newsrc nov-buffer gname newsrc active
+	 ginfo lowest glevel)
+    (setq nnkiboze-current-score-group group)
+    (or info (error "No such group: %s" group))
+    ;; Load the kiboze newsrc file for this group.
+    (and (file-exists-p newsrc-file) (load newsrc-file))
+    ;; We also load the nov file for this group.
+    (save-excursion
+      (set-buffer (setq nov-buffer (find-file-noselect nov-file)))
+      (buffer-disable-undo (current-buffer)))
+    ;; Go through the active hashtb and add new all groups that match the 
+    ;; kiboze regexp.
+    (mapatoms
+     (lambda (group)
+       (and (string-match regexp (setq gname (symbol-name group))) ; Match
+	    (not (assoc gname nnkiboze-newsrc)) ; It isn't registered
+	    (numberp (car (symbol-value group))) ; It is active
+	    (or (> nnkiboze-level 7)
+		(and (setq glevel (nth 1 (nth 2 (gnus-gethash
+						 gname gnus-newsrc-hashtb))))
+		     (>= nnkiboze-level glevel)))
+	    (not (string-match "^nnkiboze:" gname)) ; Exclude kibozes
+	    (setq nnkiboze-newsrc 
+		  (cons (cons gname (1- (car (symbol-value group))))
+			nnkiboze-newsrc))))
+     gnus-active-hashtb)
+    ;; `newsrc' is set to the list of groups that possibly are
+    ;; component groups to this kiboze group.  This list has elements
+    ;; on the form `(GROUP . NUMBER)', where NUMBER is the highest
+    ;; number that has been kibozed in GROUP in this kiboze group.
+    (setq newsrc nnkiboze-newsrc)
+    (while newsrc
+      (if (not (setq active (gnus-gethash 
+			     (caar newsrc) gnus-active-hashtb)))
+	  ;; This group isn't active after all, so we remove it from
+	  ;; the list of component groups.
+	  (setq nnkiboze-newsrc (delq (car newsrc) nnkiboze-newsrc))
+	(setq lowest (cdar newsrc))
+	;; Ok, we have a valid component group, so we jump to it. 
+	(switch-to-buffer gnus-group-buffer)
+	(gnus-group-jump-to-group (caar newsrc))
+	;; We set all list of article marks to nil.  Since we operate
+	;; on copies of the real lists, we can destroy anything we
+	;; want here.
+	(and (setq ginfo (nth 2 (gnus-gethash (gnus-group-group-name)
+					      gnus-newsrc-hashtb)))
+	     (nth 3 ginfo)
+	     (setcar (nthcdr 3 ginfo) nil))
+	;; We set the list of read articles to be what we expect for
+	;; this kiboze group -- either nil or `(1 . LOWEST)'. 
+	(and ginfo (setcar (nthcdr 2 ginfo)
+			   (and (not (= lowest 1)) (cons 1 lowest))))
+	(if (not (and (or (not ginfo)
+			  (> (length (gnus-list-of-unread-articles 
+				      (car ginfo))) 0))
+		      (progn
+			(gnus-group-select-group nil)
+			(eq major-mode 'gnus-summary-mode))))
+	    () ; No unread articles, or we couldn't enter this group.
+	  ;; We are now in the group where we want to be.
+	  (setq method (gnus-find-method-for-group gnus-newsgroup-name))
+	  (and (eq method gnus-select-method) (setq method nil))
+	  ;; We go through the list of scored articles.
+	  (while gnus-newsgroup-scored
+	    (if (> (caar gnus-newsgroup-scored) lowest)
+		;; If it has a good score, then we enter this article
+		;; into the kiboze group.
+		(nnkiboze-enter-nov 
+		 nov-buffer
+		 (gnus-summary-article-header 
+		  (caar gnus-newsgroup-scored))
+		 (if method
+		     (gnus-group-prefixed-name gnus-newsgroup-name method)
+		   gnus-newsgroup-name)))
+	    (setq gnus-newsgroup-scored (cdr gnus-newsgroup-scored)))
+	  ;; That's it.  We exit this group.
+	  (gnus-summary-exit-no-update)))
+      (setcdr (car newsrc) (car active))
+      (setq newsrc (cdr newsrc)))
+    ;; We save the nov file.
+    (set-buffer nov-buffer)
+    (save-buffer)
+    (kill-buffer (current-buffer))
+    ;; We save the kiboze newsrc for this group.
+    (set-buffer (get-buffer-create "*nnkiboze work*"))
+    (buffer-disable-undo (current-buffer))
+    (erase-buffer)
+    (insert "(setq nnkiboze-newsrc '" (prin1-to-string nnkiboze-newsrc)
+	    ")\n")
+    (write-file newsrc-file)
+    (kill-buffer (current-buffer))
+    (switch-to-buffer gnus-group-buffer)
+    (gnus-group-list-groups 5 nil)))
+    
+(defun nnkiboze-enter-nov (buffer header group)
+  (save-excursion
+    (set-buffer buffer)
+    (goto-char (point-max))
+    (let ((xref (mail-header-xref header))
+	  (prefix (gnus-group-real-prefix group))
+	  (first t)
+	  article)
+      (if (zerop (forward-line -1))
+	  (progn
+	    (setq article (1+ (read (current-buffer))))
+	    (forward-line 1))
+	(setq article 1))
+      (insert (int-to-string article) "\t"
+	      (or (mail-header-subject header) "") "\t"
+	      (or (mail-header-from header) "") "\t"
+	      (or (mail-header-date header) "") "\t"
+	      (or (mail-header-id header) "") "\t"
+	      (or (mail-header-references header) "") "\t"
+	      (int-to-string (or (mail-header-chars header) 0)) "\t"
+	      (int-to-string (or (mail-header-lines header) 0)) "\t")
+      (if (or (not xref) (equal "" xref))
+	  (insert "Xref: " (system-name) " " group ":" 
+		  (int-to-string (mail-header-number header))
+		  "\t\n")
+	(insert (mail-header-xref header) "\t\n")
+	(search-backward "\t" nil t)
+	(search-backward "\t" nil t)
+	(while (re-search-forward 
+		"[^ ]+:[0-9]+"
+		(save-excursion (end-of-line) (point)) t)
+	  (if first
+	      ;; The first xref has to be the group this article
+	      ;; really came for - this is the article nnkiboze
+	      ;; will request when it is asked for the article.
+	      (save-excursion
+		(goto-char (match-beginning 0))
+		(insert prefix group ":" 
+			(int-to-string (mail-header-number header)) " ")
+		(setq first nil)))
+	  (save-excursion
+	    (goto-char (match-beginning 0))
+	    (insert prefix)))))))
+
+(defun nnkiboze-nov-file-name ()
+  (concat (file-name-as-directory nnkiboze-directory)
+	  (nnheader-translate-file-chars
+	   (concat (nnkiboze-prefixed-name nnkiboze-current-group) ".nov"))))
+
+(provide 'nnkiboze)
+
+;;; nnkiboze.el ends here