[bpt/emacs.git] / lisp / nnvirtual.el

;;; nnvirtual.el --- virtual newsgroups access for Gnus
;; Copyright (C) 1994,95,96 Free Software Foundation, Inc.

;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
;; 	Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
;; 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 'nnoo)
(eval-when-compile (require 'cl))

(nnoo-declare nnvirtual)

(defvoo nnvirtual-always-rescan nil
  "*If non-nil, always scan groups for unread articles when entering a group.
If this variable is nil (which is the default) and you read articles
in a component group after the virtual group has been activated, the
read articles from the component group will show up when you enter the
virtual group.")

(defvoo nnvirtual-component-regexp nil
  "*Regexp to match component groups.")

\f

(defconst nnvirtual-version "nnvirtual 1.0")

(defvoo nnvirtual-current-group nil)
(defvoo nnvirtual-component-groups nil)
(defvoo nnvirtual-mapping nil)

(defvoo nnvirtual-status-string "")

(eval-and-compile
  (autoload 'gnus-cache-articles-in-group "gnus-cache"))

\f

;;; Interface functions.

(nnoo-define-basics nnvirtual)

(deffoo nnvirtual-retrieve-headers (articles &optional newsgroup
					     server fetch-old)
  (when (nnvirtual-possibly-change-server server)
    (save-excursion
      (set-buffer nntp-server-buffer)
      (erase-buffer)
      (if (stringp (car articles))
	  'headers
	(let ((vbuf (nnheader-set-temp-buffer 
		     (get-buffer-create " *virtual headers*")))
	      (unfetched (mapcar (lambda (g) (list g))
				 nnvirtual-component-groups))
	      (system-name (system-name))
	      cgroup article result prefix)
	  (while articles
	    (setq article (assq (pop articles) nnvirtual-mapping))
	    (when (and (setq cgroup (cadr article))
		       (gnus-check-server
			(gnus-find-method-for-group cgroup) t)
		       (gnus-request-group cgroup t))
	      (setq prefix (gnus-group-real-prefix cgroup))
	      (when (setq result (gnus-retrieve-headers 
				  (list (caddr article)) cgroup nil))
		(set-buffer nntp-server-buffer)
		(if (zerop (buffer-size))
		    (nconc (assq cgroup unfetched) (list (caddr article)))
		  ;; If we got HEAD headers, we convert them into NOV
		  ;; headers.  This is slow, inefficient and, come to think
		  ;; of it, downright evil.  So sue me.  I couldn't be
		  ;; bothered to write a header parse routine that could
		  ;; parse a mixed HEAD/NOV buffer.
		  (when (eq result 'headers)
		    (nnvirtual-convert-headers))
		  (goto-char (point-min))
		  (while (not (eobp))
		    (delete-region 
		     (point) (progn (read nntp-server-buffer) (point)))
		    (princ (car article) (current-buffer))
		    (beginning-of-line)
		    (looking-at 
		     "[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t")
		    (goto-char (match-end 0))
		    (or (search-forward 
			 "\t" (save-excursion (end-of-line) (point)) t)
			(end-of-line))
		    (while (= (char-after (1- (point))) ? )
		      (forward-char -1)
		      (delete-char 1))
		    (if (eolp)
			(progn
			  (end-of-line)
			  (or (= (char-after (1- (point))) ?\t)
			      (insert ?\t))
			  (insert "Xref: " system-name " " cgroup ":")
			  (princ (caddr article) (current-buffer))
			  (insert "\t"))
		      (insert "Xref: " system-name " " cgroup ":")
		      (princ (caddr article) (current-buffer))
		      (insert " ")
		      (if (not (string= "" prefix))
			  (while (re-search-forward 
				  "[^ ]+:[0-9]+"
				  (save-excursion (end-of-line) (point)) t)
			    (save-excursion
			      (goto-char (match-beginning 0))
			      (insert prefix))))
		      (end-of-line)
		      (or (= (char-after (1- (point))) ?\t)
			  (insert ?\t)))
		    (forward-line 1))
		  (set-buffer vbuf)
		  (goto-char (point-max))
		  (insert-buffer-substring nntp-server-buffer)))))
	  
	  ;; In case some of the articles have expired or been
	  ;; cancelled, we have to mark them as read in the
	  ;; component group.
	  (while unfetched
	    (when (cdar unfetched)
	      (gnus-group-make-articles-read 
	       (caar unfetched) (sort (cdar unfetched) '<)))
	    (setq unfetched (cdr unfetched)))

	  ;; The headers are ready for reading, so they are inserted into
	  ;; the nntp-server-buffer, which is where Gnus expects to find
	  ;; them.
	  (prog1
	      (save-excursion
		(set-buffer nntp-server-buffer)
		(erase-buffer)
		(insert-buffer-substring vbuf)
		'nov)
	    (kill-buffer vbuf)))))))

(deffoo nnvirtual-request-article (article &optional group server buffer)
  (when (and (nnvirtual-possibly-change-server server)
	     (numberp article))
    (let* ((amap (assq article nnvirtual-mapping))
	   (cgroup (cadr amap)))
      (cond
       ((not amap)
	(nnheader-report 'nnvirtual "No such article: %s" article))
       ((not (gnus-check-group cgroup))
	(nnheader-report
	 'nnvirtual "Can't open server where %s exists" cgroup))
       ((not (gnus-request-group cgroup t))
	(nnheader-report 'nnvirtual "Can't open component group %s" cgroup))
       (t
	(if buffer 
	    (save-excursion
	      (set-buffer buffer)
	      (gnus-request-article-this-buffer (caddr amap) cgroup))
	  (gnus-request-article (caddr amap) cgroup)))))))

(deffoo nnvirtual-open-server (server &optional defs)
  (unless (assq 'nnvirtual-component-regexp defs)
    (push `(nnvirtual-component-regexp ,server)
	  defs))
  (nnoo-change-server 'nnvirtual server defs)
  (if nnvirtual-component-groups
      t
    (setq nnvirtual-mapping nil)
    ;; Go through the newsrc alist and find all component groups.
    (let ((newsrc (cdr gnus-newsrc-alist))
	  group)
      (while (setq group (car (pop newsrc)))
	(when (string-match nnvirtual-component-regexp group) ; Match
	  ;; Add this group to the list of component groups.
	  (setq nnvirtual-component-groups
		(cons group (delete group nnvirtual-component-groups))))))
    (if (not nnvirtual-component-groups)
	(nnheader-report 'nnvirtual "No component groups: %s" server)
      t)))

(deffoo nnvirtual-request-group (group &optional server dont-check)
  (nnvirtual-possibly-change-server server)
  (setq nnvirtual-component-groups
	(delete (nnvirtual-current-group) nnvirtual-component-groups))
  (cond
   ((null nnvirtual-component-groups)
    (setq nnvirtual-current-group nil)
    (nnheader-report 'nnvirtual "No component groups in %s" group))
   (t
    (unless dont-check
      (nnvirtual-create-mapping))
    (setq nnvirtual-current-group group)
    (let ((len (length nnvirtual-mapping)))
      (nnheader-insert "211 %d 1 %d %s\n" len len group)))))

(deffoo nnvirtual-request-type (group &optional article)
  (if (not article)
      'unknown
    (let ((mart (assq article nnvirtual-mapping)))
      (when mart
	(gnus-request-type (cadr mart) (car mart))))))

(deffoo nnvirtual-request-update-mark (group article mark)
  (let* ((nart (assq article nnvirtual-mapping))
	 (cgroup (cadr nart))
	 ;; The component group might be a virtual group.
	 (nmark (gnus-request-update-mark cgroup (caddr nart) mark)))
    (when (and nart
	       (= mark nmark)
	       (gnus-group-auto-expirable-p cgroup))
      (setq mark gnus-expirable-mark)))
  mark)
    
(deffoo nnvirtual-close-group (group &optional server)
  (when (nnvirtual-possibly-change-server server)
    ;; Copy (un)read articles.
    (nnvirtual-update-reads)
    ;; We copy the marks from this group to the component
    ;; groups here.
    (nnvirtual-update-marked))
  t)
    
(deffoo nnvirtual-request-list (&optional server) 
  (nnheader-report 'nnvirtual "LIST is not implemented."))

(deffoo nnvirtual-request-newgroups (date &optional server)
  (nnheader-report 'nnvirtual "NEWGROUPS is not supported."))

(deffoo nnvirtual-request-list-newsgroups (&optional server)
  (nnheader-report 'nnvirtual "LIST NEWSGROUPS is not implemented."))

(deffoo nnvirtual-request-update-info (group info &optional server)
  (when (nnvirtual-possibly-change-server server)
    (let ((map nnvirtual-mapping)
	  (marks (mapcar (lambda (m) (list (cdr m))) gnus-article-mark-lists))
	  reads mr m op)
      ;; Go through the mapping.
      (while map
	(unless (nth 3 (setq m (pop map)))
	  ;; Read article.
	  (push (car m) reads))
	;; Copy marks.
	(when (setq mr (nth 4 m))
	  (while mr
	    (setcdr (setq op (assq (pop mr) marks)) (cons (car m) (cdr op))))))
      ;; Compress the marks and the reads.
      (setq mr marks)
      (while mr
	(setcdr (car mr) (gnus-compress-sequence (sort (cdr (pop mr)) '<))))
      (setcar (cddr info) (gnus-compress-sequence (nreverse reads)))
      ;; Remove empty marks lists.
      (while (and marks (not (cdar marks)))
	(setq marks (cdr marks)))
      (setq mr marks)
      (while (cdr mr)
	(if (cdadr mr)
	    (setq mr (cdr mr))
	  (setcdr mr (cddr mr))))

      ;; Enter these new marks into the info of the group.
      (if (nthcdr 3 info)
	  (setcar (nthcdr 3 info) marks)
	;; Add the marks lists to the end of the info.
	(when marks
	  (setcdr (nthcdr 2 info) (list marks))))
      t)))

(deffoo nnvirtual-catchup-group (group &optional server all)
  (nnvirtual-possibly-change-server server)
  (let ((gnus-group-marked (copy-sequence nnvirtual-component-groups))
	(gnus-expert-user t))
    ;; Make sure all groups are activated.
    (mapcar
     (lambda (g)
       (when (not (numberp (car (gnus-gethash g gnus-newsrc-hashtb))))
	 (gnus-activate-group g)))
     nnvirtual-component-groups)
    (save-excursion
      (set-buffer gnus-group-buffer)
      (gnus-group-catchup-current nil all))))

(deffoo nnvirtual-find-group-art (group article)
  "Return the real group and article for virtual GROUP and ARTICLE."
  (let ((mart (assq article nnvirtual-mapping)))
    (when mart
      (cons (cadr mart) (caddr mart)))))

\f
;;; Internal functions.

(defun nnvirtual-convert-headers ()
  "Convert HEAD headers into NOV headers."
  (save-excursion
    (set-buffer nntp-server-buffer)
    (let* ((dependencies (make-vector 100 0))
	   (headers (gnus-get-newsgroup-headers dependencies))
	   header)
      (erase-buffer)
      (while (setq header (pop headers))
	(nnheader-insert-nov header)))))

(defun nnvirtual-possibly-change-server (server)
  (or (not server)
      (nnoo-current-server-p 'nnvirtual server)
      (nnvirtual-open-server server)))

(defun nnvirtual-update-marked ()
  "Copy marks from the virtual group to the component groups."
  (let ((mark-lists gnus-article-mark-lists)
	(marks (gnus-info-marks (gnus-get-info (nnvirtual-current-group))))
	type list mart cgroups)
    (while (setq type (cdr (pop mark-lists)))
      (setq list (gnus-uncompress-range (cdr (assq type marks))))
      (setq cgroups 
	    (mapcar (lambda (g) (list g)) nnvirtual-component-groups))
      (while list
	(nconc (assoc (cadr (setq mart (assq (pop list) nnvirtual-mapping)))
		      cgroups)
	       (list (caddr mart))))
      (while cgroups
	(gnus-add-marked-articles 
	 (caar cgroups) type (cdar cgroups) nil t)
	(gnus-group-update-group (car (pop cgroups)) t)))))

(defun nnvirtual-update-reads ()
  "Copy (un)reads from the current group to the component groups."
  (let ((groups (mapcar (lambda (g) (list g)) nnvirtual-component-groups))
	(articles (gnus-list-of-unread-articles
		   (nnvirtual-current-group)))
	m)
    (while articles
      (setq m (assq (pop articles) nnvirtual-mapping))
      (nconc (assoc (nth 1 m) groups) (list (nth 2 m))))
    (while groups
      (gnus-update-read-articles (caar groups) (cdr (pop groups))))))

(defun nnvirtual-current-group ()
  "Return the prefixed name of the current nnvirtual group."
  (concat "nnvirtual:" nnvirtual-current-group))

(defsubst nnvirtual-marks (article marks)
  "Return a list of mark types for ARTICLE."
  (let (out)
    (while marks
      (when (memq article (cdar marks))
	(push (caar marks) out))
      (setq marks (cdr marks)))
    out))

(defun nnvirtual-create-mapping ()
  "Create an article mapping for the current group."
  (let* ((div nil)
	 m marks list article unreads marks active
	 (map (sort
	       (apply 
		'nconc
		(mapcar
		 (lambda (g)
		   (when (and (setq active (gnus-activate-group g))
			      (> (cdr active) (car active)))
		     (setq unreads (gnus-list-of-unread-articles g)
			   marks (gnus-uncompress-marks
				  (gnus-info-marks (gnus-get-info g))))
		     (when gnus-use-cache
		       (push (cons 'cache (gnus-cache-articles-in-group g))
			     marks))
		     (setq div (/ (float (car active)) 
				  (if (zerop (cdr active))
				      1 (cdr active))))
		     (mapcar (lambda (n) 
			       (list (* div (- n (car active)))
				     g n (and (memq n unreads) t)
				     (inline (nnvirtual-marks n marks))))
			     (gnus-uncompress-range active))))
		 nnvirtual-component-groups))
	       (lambda (m1 m2)
		 (< (car m1) (car m2)))))
	 (i 0))
    (setq nnvirtual-mapping map)
    ;; Set the virtual article numbers.
    (while (setq m (pop map))
      (setcar m (setq article (incf i))))))

(provide 'nnvirtual)

;;; nnvirtual.el ends here
Commit	Line	Data
41487370	1	;;; nnvirtual.el --- virtual newsgroups access for Gnus
231f989b	2	;; Copyright (C) 1994,95,96 Free Software Foundation, Inc.
41487370 LMI	3
	4	;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
	5	;; Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
	6	;; Keywords: news
	7
	8	;; This file is part of GNU Emacs.
	9
	10	;; GNU Emacs is free software; you can redistribute it and/or modify
	11	;; it under the terms of the GNU General Public License as published by
	12	;; the Free Software Foundation; either version 2, or (at your option)
	13	;; any later version.
	14
	15	;; GNU Emacs is distributed in the hope that it will be useful,
	16	;; but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	;; GNU General Public License for more details.
	19
	20	;; You should have received a copy of the GNU General Public License
b578f267 EN	21	;; along with GNU Emacs; see the file COPYING. If not, write to the
	22	;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	23	;; Boston, MA 02111-1307, USA.
41487370 LMI	24
	25	;;; Commentary:
	26
	27	;; The other access methods (nntp, nnspool, etc) are general news
	28	;; access methods. This module relies on Gnus and can not be used
	29	;; separately.
	30
	31	;;; Code:
	32
	33	(require 'nntp)
	34	(require 'nnheader)
	35	(require 'gnus)
231f989b LMI	36	(require 'nnoo)
	37	(eval-when-compile (require 'cl))
	38
	39	(nnoo-declare nnvirtual)
	40
	41	(defvoo nnvirtual-always-rescan nil
	42	"*If non-nil, always scan groups for unread articles when entering a group.
	43	If this variable is nil (which is the default) and you read articles
	44	in a component group after the virtual group has been activated, the
	45	read articles from the component group will show up when you enter the
	46	virtual group.")
	47
	48	(defvoo nnvirtual-component-regexp nil
	49	"*Regexp to match component groups.")
41487370 LMI	50
	51	\f
	52
231f989b	53	(defconst nnvirtual-version "nnvirtual 1.0")
41487370	54
231f989b LMI	55	(defvoo nnvirtual-current-group nil)
	56	(defvoo nnvirtual-component-groups nil)
	57	(defvoo nnvirtual-mapping nil)
41487370	58
231f989b	59	(defvoo nnvirtual-status-string "")
41487370	60
231f989b LMI	61	(eval-and-compile
231f989b LMI	62	(autoload 'gnus-cache-articles-in-group "gnus-cache"))
41487370 LMI	63
	64	\f
	65
	66	;;; Interface functions.
	67
231f989b LMI	68	(nnoo-define-basics nnvirtual)
	69
	70	(deffoo nnvirtual-retrieve-headers (articles &optional newsgroup
	71	server fetch-old)
	72	(when (nnvirtual-possibly-change-server server)
	73	(save-excursion
	74	(set-buffer nntp-server-buffer)
	75	(erase-buffer)
	76	(if (stringp (car articles))
	77	'headers
	78	(let ((vbuf (nnheader-set-temp-buffer
	79	(get-buffer-create " virtual headers")))
	80	(unfetched (mapcar (lambda (g) (list g))
	81	nnvirtual-component-groups))
	82	(system-name (system-name))
	83	cgroup article result prefix)
	84	(while articles
	85	(setq article (assq (pop articles) nnvirtual-mapping))
	86	(when (and (setq cgroup (cadr article))
	87	(gnus-check-server
	88	(gnus-find-method-for-group cgroup) t)
	89	(gnus-request-group cgroup t))
	90	(setq prefix (gnus-group-real-prefix cgroup))
	91	(when (setq result (gnus-retrieve-headers
	92	(list (caddr article)) cgroup nil))
	93	(set-buffer nntp-server-buffer)
	94	(if (zerop (buffer-size))
	95	(nconc (assq cgroup unfetched) (list (caddr article)))
	96	;; If we got HEAD headers, we convert them into NOV
	97	;; headers. This is slow, inefficient and, come to think
	98	;; of it, downright evil. So sue me. I couldn't be
	99	;; bothered to write a header parse routine that could
	100	;; parse a mixed HEAD/NOV buffer.
	101	(when (eq result 'headers)
	102	(nnvirtual-convert-headers))
	103	(goto-char (point-min))
	104	(while (not (eobp))
	105	(delete-region
	106	(point) (progn (read nntp-server-buffer) (point)))
	107	(princ (car article) (current-buffer))
	108	(beginning-of-line)
	109	(looking-at
	110	"[^\t]\t[^\t]\t[^\t]\t[^\t]\t[^\t]\t[^\t]\t[^\t]*\t")
	111	(goto-char (match-end 0))
	112	(or (search-forward
	113	"\t" (save-excursion (end-of-line) (point)) t)
	114	(end-of-line))
	115	(while (= (char-after (1- (point))) ? )
	116	(forward-char -1)
	117	(delete-char 1))
	118	(if (eolp)
	119	(progn
	120	(end-of-line)
	121	(or (= (char-after (1- (point))) ?\t)
	122	(insert ?\t))
	123	(insert "Xref: " system-name " " cgroup ":")
	124	(princ (caddr article) (current-buffer))
	125	(insert "\t"))
	126	(insert "Xref: " system-name " " cgroup ":")
	127	(princ (caddr article) (current-buffer))
	128	(insert " ")
	129	(if (not (string= "" prefix))
	130	(while (re-search-forward
	131	"[^ ]+:[0-9]+"
132	(save-excursion (end-of-line) (point)) t)
133	(save-excursion
134	(goto-char (match-beginning 0))
135	(insert prefix))))
136	(end-of-line)
137	(or (= (char-after (1- (point))) ?\t)
138	(insert ?\t)))
139	(forward-line 1))
140	(set-buffer vbuf)
141	(goto-char (point-max))
142	(insert-buffer-substring nntp-server-buffer)))))
143
144	;; In case some of the articles have expired or been
145	;; cancelled, we have to mark them as read in the
146	;; component group.
147	(while unfetched
148	(when (cdar unfetched)
149	(gnus-group-make-articles-read
150	(caar unfetched) (sort (cdar unfetched) '<)))
151	(setq unfetched (cdr unfetched)))
152
153	;; The headers are ready for reading, so they are inserted into
154	;; the nntp-server-buffer, which is where Gnus expects to find
155	;; them.
156	(prog1
41487370 LMI	157	(save-excursion
41487370 LMI	158	(set-buffer nntp-server-buffer)
231f989b LMI	159	(erase-buffer)
	160	(insert-buffer-substring vbuf)
	161	'nov)
	162	(kill-buffer vbuf)))))))
	163
	164	(deffoo nnvirtual-request-article (article &optional group server buffer)
	165	(when (and (nnvirtual-possibly-change-server server)
	166	(numberp article))
	167	(let* ((amap (assq article nnvirtual-mapping))
	168	(cgroup (cadr amap)))
	169	(cond
	170	((not amap)
	171	(nnheader-report 'nnvirtual "No such article: %s" article))
	172	((not (gnus-check-group cgroup))
	173	(nnheader-report
	174	'nnvirtual "Can't open server where %s exists" cgroup))
	175	((not (gnus-request-group cgroup t))
	176	(nnheader-report 'nnvirtual "Can't open component group %s" cgroup))
	177	(t
	178	(if buffer
41487370	179	(save-excursion
231f989b LMI	180	(set-buffer buffer)
	181	(gnus-request-article-this-buffer (caddr amap) cgroup))
	182	(gnus-request-article (caddr amap) cgroup)))))))
	183
	184	(deffoo nnvirtual-open-server (server &optional defs)
	185	(unless (assq 'nnvirtual-component-regexp defs)
	186	(push `(nnvirtual-component-regexp ,server)
	187	defs))
	188	(nnoo-change-server 'nnvirtual server defs)
	189	(if nnvirtual-component-groups
	190	t
	191	(setq nnvirtual-mapping nil)
	192	;; Go through the newsrc alist and find all component groups.
	193	(let ((newsrc (cdr gnus-newsrc-alist))
	194	group)
	195	(while (setq group (car (pop newsrc)))
	196	(when (string-match nnvirtual-component-regexp group) ; Match
	197	;; Add this group to the list of component groups.
	198	(setq nnvirtual-component-groups
	199	(cons group (delete group nnvirtual-component-groups))))))
	200	(if (not nnvirtual-component-groups)
	201	(nnheader-report 'nnvirtual "No component groups: %s" server)
	202	t)))
	203
	204	(deffoo nnvirtual-request-group (group &optional server dont-check)
	205	(nnvirtual-possibly-change-server server)
	206	(setq nnvirtual-component-groups
	207	(delete (nnvirtual-current-group) nnvirtual-component-groups))
	208	(cond
	209	((null nnvirtual-component-groups)
	210	(setq nnvirtual-current-group nil)
	211	(nnheader-report 'nnvirtual "No component groups in %s" group))
	212	(t
	213	(unless dont-check
	214	(nnvirtual-create-mapping))
	215	(setq nnvirtual-current-group group)
	216	(let ((len (length nnvirtual-mapping)))
	217	(nnheader-insert "211 %d 1 %d %s\n" len len group)))))
	218
	219	(deffoo nnvirtual-request-type (group &optional article)
	220	(if (not article)
	221	'unknown
	222	(let ((mart (assq article nnvirtual-mapping)))
	223	(when mart
	224	(gnus-request-type (cadr mart) (car mart))))))
	225
	226	(deffoo nnvirtual-request-update-mark (group article mark)
	227	(let* ((nart (assq article nnvirtual-mapping))
	228	(cgroup (cadr nart))
	229	;; The component group might be a virtual group.
	230	(nmark (gnus-request-update-mark cgroup (caddr nart) mark)))
	231	(when (and nart
	232	(= mark nmark)
	233	(gnus-group-auto-expirable-p cgroup))
	234	(setq mark gnus-expirable-mark)))
	235	mark)
	236
	237	(deffoo nnvirtual-close-group (group &optional server)
	238	(when (nnvirtual-possibly-change-server server)
	239	;; Copy (un)read articles.
	240	(nnvirtual-update-reads)
	241	;; We copy the marks from this group to the component
	242	;; groups here.
	243	(nnvirtual-update-marked))
41487370	244	t)
231f989b LMI	245
	246	(deffoo nnvirtual-request-list (&optional server)
	247	(nnheader-report 'nnvirtual "LIST is not implemented."))
41487370	248
231f989b LMI	249	(deffoo nnvirtual-request-newgroups (date &optional server)
	250	(nnheader-report 'nnvirtual "NEWGROUPS is not supported."))
	251
	252	(deffoo nnvirtual-request-list-newsgroups (&optional server)
	253	(nnheader-report 'nnvirtual "LIST NEWSGROUPS is not implemented."))
41487370	254
231f989b LMI	255	(deffoo nnvirtual-request-update-info (group info &optional server)
	256	(when (nnvirtual-possibly-change-server server)
	257	(let ((map nnvirtual-mapping)
	258	(marks (mapcar (lambda (m) (list (cdr m))) gnus-article-mark-lists))
	259	reads mr m op)
	260	;; Go through the mapping.
	261	(while map
	262	(unless (nth 3 (setq m (pop map)))
	263	;; Read article.
	264	(push (car m) reads))
	265	;; Copy marks.
	266	(when (setq mr (nth 4 m))
	267	(while mr
	268	(setcdr (setq op (assq (pop mr) marks)) (cons (car m) (cdr op))))))
	269	;; Compress the marks and the reads.
	270	(setq mr marks)
	271	(while mr
	272	(setcdr (car mr) (gnus-compress-sequence (sort (cdr (pop mr)) '<))))
	273	(setcar (cddr info) (gnus-compress-sequence (nreverse reads)))
	274	;; Remove empty marks lists.
	275	(while (and marks (not (cdar marks)))
	276	(setq marks (cdr marks)))
	277	(setq mr marks)
	278	(while (cdr mr)
	279	(if (cdadr mr)
	280	(setq mr (cdr mr))
	281	(setcdr mr (cddr mr))))
	282
	283	;; Enter these new marks into the info of the group.
	284	(if (nthcdr 3 info)
	285	(setcar (nthcdr 3 info) marks)
	286	;; Add the marks lists to the end of the info.
	287	(when marks
	288	(setcdr (nthcdr 2 info) (list marks))))
	289	t)))
	290
	291	(deffoo nnvirtual-catchup-group (group &optional server all)
	292	(nnvirtual-possibly-change-server server)
	293	(let ((gnus-group-marked (copy-sequence nnvirtual-component-groups))
	294	(gnus-expert-user t))
	295	;; Make sure all groups are activated.
	296	(mapcar
	297	(lambda (g)
	298	(when (not (numberp (car (gnus-gethash g gnus-newsrc-hashtb))))
	299	(gnus-activate-group g)))
	300	nnvirtual-component-groups)
41487370	301	(save-excursion
231f989b LMI	302	(set-buffer gnus-group-buffer)
	303	(gnus-group-catchup-current nil all))))
	304
	305	(deffoo nnvirtual-find-group-art (group article)
	306	"Return the real group and article for virtual GROUP and ARTICLE."
	307	(let ((mart (assq article nnvirtual-mapping)))
	308	(when mart
	309	(cons (cadr mart) (caddr mart)))))
41487370 LMI	310
	311	\f
	312	;;; Internal functions.
	313
41487370	314	(defun nnvirtual-convert-headers ()
231f989b	315	"Convert HEAD headers into NOV headers."
41487370 LMI	316	(save-excursion
41487370 LMI	317	(set-buffer nntp-server-buffer)
231f989b LMI	318	(let* ((dependencies (make-vector 100 0))
231f989b LMI	319	(headers (gnus-get-newsgroup-headers dependencies))
41487370 LMI	320	header)
41487370 LMI	321	(erase-buffer)
231f989b LMI	322	(while (setq header (pop headers))
	323	(nnheader-insert-nov header)))))
	324
	325	(defun nnvirtual-possibly-change-server (server)
	326	(or (not server)
	327	(nnoo-current-server-p 'nnvirtual server)
	328	(nnvirtual-open-server server)))
41487370 LMI	329
41487370 LMI	330	(defun nnvirtual-update-marked ()
231f989b LMI	331	"Copy marks from the virtual group to the component groups."
	332	(let ((mark-lists gnus-article-mark-lists)
	333	(marks (gnus-info-marks (gnus-get-info (nnvirtual-current-group))))
	334	type list mart cgroups)
	335	(while (setq type (cdr (pop mark-lists)))
	336	(setq list (gnus-uncompress-range (cdr (assq type marks))))
	337	(setq cgroups
	338	(mapcar (lambda (g) (list g)) nnvirtual-component-groups))
	339	(while list
	340	(nconc (assoc (cadr (setq mart (assq (pop list) nnvirtual-mapping)))
	341	cgroups)
	342	(list (caddr mart))))
	343	(while cgroups
41487370	344	(gnus-add-marked-articles
231f989b LMI	345	(caar cgroups) type (cdar cgroups) nil t)
	346	(gnus-group-update-group (car (pop cgroups)) t)))))
	347
	348	(defun nnvirtual-update-reads ()
	349	"Copy (un)reads from the current group to the component groups."
	350	(let ((groups (mapcar (lambda (g) (list g)) nnvirtual-component-groups))
	351	(articles (gnus-list-of-unread-articles
	352	(nnvirtual-current-group)))
	353	m)
	354	(while articles
	355	(setq m (assq (pop articles) nnvirtual-mapping))
	356	(nconc (assoc (nth 1 m) groups) (list (nth 2 m))))
	357	(while groups
	358	(gnus-update-read-articles (caar groups) (cdr (pop groups))))))
	359
	360	(defun nnvirtual-current-group ()
	361	"Return the prefixed name of the current nnvirtual group."
	362	(concat "nnvirtual:" nnvirtual-current-group))
	363
	364	(defsubst nnvirtual-marks (article marks)
	365	"Return a list of mark types for ARTICLE."
	366	(let (out)
	367	(while marks
	368	(when (memq article (cdar marks))
	369	(push (caar marks) out))
	370	(setq marks (cdr marks)))
	371	out))
	372
	373	(defun nnvirtual-create-mapping ()
	374	"Create an article mapping for the current group."
	375	(let* ((div nil)
	376	m marks list article unreads marks active
	377	(map (sort
	378	(apply
	379	'nconc
	380	(mapcar
	381	(lambda (g)
	382	(when (and (setq active (gnus-activate-group g))
	383	(> (cdr active) (car active)))
	384	(setq unreads (gnus-list-of-unread-articles g)
	385	marks (gnus-uncompress-marks
	386	(gnus-info-marks (gnus-get-info g))))
	387	(when gnus-use-cache
	388	(push (cons 'cache (gnus-cache-articles-in-group g))
	389	marks))
	390	(setq div (/ (float (car active))
	391	(if (zerop (cdr active))
	392	1 (cdr active))))
	393	(mapcar (lambda (n)
	394	(list (* div (- n (car active)))
	395	g n (and (memq n unreads) t)
	396	(inline (nnvirtual-marks n marks))))
	397	(gnus-uncompress-range active))))
	398	nnvirtual-component-groups))
	399	(lambda (m1 m2)
	400	(< (car m1) (car m2)))))
	401	(i 0))
	402	(setq nnvirtual-mapping map)
	403	;; Set the virtual article numbers.
	404	(while (setq m (pop map))
	405	(setcar m (setq article (incf i))))))
41487370 LMI	406
	407	(provide 'nnvirtual)
	408
	409	;;; nnvirtual.el ends here