;;; nnvirtual.el --- virtual newsgroups access for Gnus
;; Copyright (C) 1994,95,96 Free Software Foundation, Inc.
-;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
+;; Author: David Moore <dmoore@ucsd.edu>
+;; Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
;; Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
;; Keywords: news
\f
-(defconst nnvirtual-version "nnvirtual 1.0")
+(defconst nnvirtual-version "nnvirtual 1.1")
(defvoo nnvirtual-current-group nil)
-(defvoo nnvirtual-mapping nil)
+
+(defvoo nnvirtual-mapping-table nil
+ "Table of rules on how to map between component group and article number
+to virtual article number.")
+
+(defvoo nnvirtual-mapping-offsets nil
+ "Table indexed by component group to an offset to be applied to article
+numbers in that group.")
+
+(defvoo nnvirtual-mapping-len 0
+ "Number of articles in this virtual group.")
+
+(defvoo nnvirtual-mapping-reads nil
+ "Compressed sequence of read articles on the virtual group as computed
+from the unread status of individual component groups.")
+
+(defvoo nnvirtual-mapping-marks nil
+ "Compressed marks alist for the virtual group as computed from the
+marks of individual component groups.")
(defvoo nnvirtual-status-string "")
(nnoo-define-basics nnvirtual)
+
(deffoo nnvirtual-retrieve-headers (articles &optional newsgroup
server fetch-old)
(when (nnvirtual-possibly-change-server server)
'headers
(let ((vbuf (nnheader-set-temp-buffer
(get-buffer-create " *virtual headers*")))
- (unfetched (mapcar (lambda (g) (list g))
- nnvirtual-component-groups))
+ (carticles (nnvirtual-partition-sequence articles))
(system-name (system-name))
- cgroup article result prefix)
- (while articles
- (setq article (assq (pop articles) nnvirtual-mapping))
- (when (and (setq cgroup (cadr article))
+ cgroup carticle article result prefix)
+ (while carticles
+ (setq cgroup (caar carticles))
+ (setq articles (cdar carticles))
+ (pop carticles)
+ (when (and articles
(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))
+ (gnus-request-group cgroup t)
+ (setq prefix (gnus-group-real-prefix cgroup))
+ ;; FIX FIX FIX we want to check the cache!
+ ;; This is probably evil if people have set
+ ;; gnus-use-cache to nil themselves, but I
+ ;; have no way of finding the true value of it.
+ (let ((gnus-use-cache t))
+ (setq result (gnus-retrieve-headers
+ articles cgroup nil))))
+ (set-buffer nntp-server-buffer)
+ ;; 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
+ (setq carticle (read nntp-server-buffer))
+ (point)))
+
+ ;; We remove this article from the articles list, if
+ ;; anything is left in the articles list after going through
+ ;; the entire buffer, then those articles have been
+ ;; expired or canceled, so we appropriately update the
+ ;; component group below. They should be coming up
+ ;; generally in order, so this shouldn't be slow.
+ (setq articles (delq carticle articles))
+
+ (setq article (nnvirtual-reverse-map-article cgroup carticle))
+ (if (null article)
+ ;; This line has no reverse mapping, that means it
+ ;; was an extra article reference returned by nntp.
+ (progn
(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 " ")
- (when (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)))
+ (delete-region (point) (progn (forward-line 1) (point))))
+ ;; Otherwise insert the virtual article number,
+ ;; and clean up the xrefs.
+ (princ article nntp-server-buffer)
+ (nnvirtual-update-xref-header cgroup carticle
+ prefix system-name)
+ (forward-line 1))
+ )
+
+ (set-buffer vbuf)
+ (goto-char (point-max))
+ (insert-buffer-substring nntp-server-buffer))
+ ;; Anything left in articles is expired or canceled.
+ ;; Could be smart and not tell it about articles already known?
+ (when articles
+ (gnus-group-make-articles-read cgroup articles))
+ )
;; The headers are ready for reading, so they are inserted into
;; the nntp-server-buffer, which is where Gnus expects to find
(set-buffer nntp-server-buffer)
(erase-buffer)
(insert-buffer-substring vbuf)
+ ;; FIX FIX FIX, we should be able to sort faster than
+ ;; this if needed, since each cgroup is sorted, we just
+ ;; need to merge
+ (sort-numeric-fields 1 (point-min) (point-max))
'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)))
+ (let* ((amap (nnvirtual-map-article article))
+ (cgroup (car amap)))
(cond
((not amap)
(nnheader-report 'nnvirtual "No such article: %s" article))
(if buffer
(save-excursion
(set-buffer buffer)
- (gnus-request-article-this-buffer (caddr amap) cgroup))
- (gnus-request-article (caddr amap) cgroup)))))))
+ (gnus-request-article-this-buffer (cdr amap) cgroup))
+ (gnus-request-article (cdr amap) cgroup)))))))
+
(deffoo nnvirtual-open-server (server &optional defs)
(unless (assq 'nnvirtual-component-regexp defs)
(nnoo-change-server 'nnvirtual server defs)
(if nnvirtual-component-groups
t
- (setq nnvirtual-mapping nil)
+ (setq nnvirtual-mapping-table nil
+ nnvirtual-mapping-offsets nil
+ nnvirtual-mapping-len 0
+ nnvirtual-mapping-reads nil
+ nnvirtual-mapping-marks nil)
(when nnvirtual-component-regexp
;; Go through the newsrc alist and find all component groups.
(let ((newsrc (cdr gnus-newsrc-alist))
(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
nnvirtual-always-rescan)
(nnvirtual-create-mapping))
(setq nnvirtual-current-group group)
- (let ((len (length nnvirtual-mapping)))
- (nnheader-insert "211 %d 1 %d %s\n" len len group)))))
+ (nnheader-insert "211 %d 1 %d %s\n"
+ nnvirtual-mapping-len nnvirtual-mapping-len group))))
+
(deffoo nnvirtual-request-type (group &optional article)
(if (not article)
'unknown
- (let ((mart (assq article nnvirtual-mapping)))
+ (let ((mart (nnvirtual-map-article article)))
(when mart
- (gnus-request-type (cadr mart) (car mart))))))
+ (gnus-request-type (car mart) (cdr mart))))))
(deffoo nnvirtual-request-update-mark (group article mark)
- (let* ((nart (assq article nnvirtual-mapping))
- (cgroup (cadr nart))
+ (let* ((nart (nnvirtual-map-article article))
+ (cgroup (car nart))
;; The component group might be a virtual group.
- (nmark (gnus-request-update-mark cgroup (caddr nart) mark)))
+ (nmark (gnus-request-update-mark cgroup (cdr 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 (and (nnvirtual-possibly-change-server server)
(not (gnus-ephemeral-group-p (nnvirtual-current-group))))
- ;; Copy (un)read articles.
+ ;; Copy (un)read status and marks back to component groups.
(nnvirtual-update-reads)
- ;; We copy the marks from this group to the component
- ;; groups here.
- (nnvirtual-update-marked))
+ (nnvirtual-update-marked t))
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)))
+ ;; Install the lists.
+ (setcar (cddr info) nnvirtual-mapping-reads)
+ (if (nthcdr 3 info)
+ (setcar (nthcdr 3 info) nnvirtual-mapping-marks)
+ (when nnvirtual-mapping-marks
+ (setcdr (nthcdr 2 info) (list nnvirtual-mapping-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))))
+ (when (and (nnvirtual-possibly-change-server server)
+ (not (gnus-ephemeral-group-p (nnvirtual-current-group))))
+ ;; copy over existing marks first, in case they set anything
+ (nnvirtual-update-marked nil)
+ ;; do a catchup on all component groups
+ (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)))))
+ (nnvirtual-map-article article))
\f
;;; Internal functions.
(while (setq header (pop headers))
(nnheader-insert-nov header)))))
+
+(defun nnvirtual-update-xref-header (group article prefix system-name)
+ "Edit current NOV header in current buffer to have an xref to the
+component group, and also server prefix any existing xref lines."
+ ;; Move to beginning of Xref field, creating a slot if needed.
+ (beginning-of-line)
+ (looking-at
+ "[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t")
+ (goto-char (match-end 0))
+ (unless (search-forward "\t" (gnus-point-at-eol) 'move)
+ (insert "\t"))
+
+ ;; Remove any spaces at the beginning of the Xref field.
+ (while (= (char-after (1- (point))) ? )
+ (forward-char -1)
+ (delete-char 1))
+
+ (insert "Xref: " system-name " " group ":")
+ (princ article (current-buffer))
+
+ ;; If there were existing xref lines, clean them up to have the correct
+ ;; component server prefix.
+ (let ((xref-end (save-excursion
+ (search-forward "\t" (gnus-point-at-eol) 'move)
+ (point)))
+ (len (length prefix)))
+ (unless (= (point) xref-end)
+ (insert " ")
+ (when (not (string= "" prefix))
+ (while (re-search-forward "[^ ]+:[0-9]+" xref-end t)
+ (save-excursion
+ (goto-char (match-beginning 0))
+ (insert prefix))
+ (setq xref-end (+ xref-end len)))
+ )))
+
+ ;; Ensure a trailing \t.
+ (end-of-line)
+ (or (= (char-after (1- (point))) ?\t)
+ (insert ?\t)))
+
+
(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))))
+ "Copy (un)read status from the virtual group to the component groups."
+ (let ((unreads (nnvirtual-partition-sequence (gnus-list-of-unread-articles
+ (nnvirtual-current-group))))
+ entry)
+ (while (setq entry (pop unreads))
+ (gnus-update-read-articles (car entry) (cdr entry)))))
+
+
+(defun nnvirtual-update-marked (update-p)
+ "Copy marks from the virtual group to the component groups.
+If UPDATE-P is not nil, call gnus-group-update-group on the components."
+ (let ((type-marks (mapcar (lambda (ml)
+ (cons (car ml)
+ (nnvirtual-partition-sequence (cdr ml))))
+ (gnus-info-marks (gnus-get-info
+ (nnvirtual-current-group)))))
+ mark type groups carticles info)
+
+ ;; clear all existing marks on the component groups, since
+ ;; we install new versions below.
+ (setq groups nnvirtual-component-groups)
(while groups
- (gnus-update-read-articles (caar groups) (cdr (pop groups))))))
+ (when (and (setq info (gnus-get-info (pop groups)))
+ (gnus-info-marks info))
+ (gnus-info-set-marks info nil)))
+
+ ;; Ok, currently type-marks is an assq list with keys of a mark type,
+ ;; with data of an assq list with keys of component group names
+ ;; and the articles which correspond to that key/group pair.
+ (while (setq mark (pop type-marks))
+ (setq type (car mark))
+ (setq groups (cdr mark))
+ (while (setq carticles (pop groups))
+ (gnus-add-marked-articles (car carticles) type (cdr carticles)
+ nil t)))
+
+ ;; possibly update the display, it is really slow
+ (when update-p
+ (setq groups nnvirtual-component-groups)
+ (while groups
+ (gnus-group-update-group (pop groups) t)))
+ ))
+
(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))
+
+
+;;; This is currently O(kn^2) to merge n lists of length k.
+;;; You could do it in O(knlogn), but we have a small n, and the
+;;; overhead of the other approach is probably greater.
+(defun nnvirtual-merge-sorted-lists (&rest lists)
+ "Merge many sorted lists of numbers."
+ (if (null (cdr lists))
+ (car lists)
+ (apply 'nnvirtual-merge-sorted-lists
+ (merge 'list (car lists) (cadr lists) '<)
+ (cddr lists))))
+
+
+
+;;; We map between virtual articles and real articles in a manner
+;;; which keeps the size of the virtual active list the same as
+;;; the sum of the component active lists.
+;;; To achieve fair mixing of the groups, the last article in
+;;; each of N component groups will be in the the last N articles
+;;; in the virtual group.
+
+;;; If you have 3 components A, B and C, with articles 1-8, 1-5, and 6-7
+;;; resprectively, then the virtual article numbers look like:
+;;;
+;;; 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
+;;; A1 A2 A3 A4 B1 A5 B2 A6 B3 A7 B4 C6 A8 B5 C7
+
+;;; To compute these mappings we generate a couple tables and then
+;;; do some fast operations on them. Tables for the example above:
+;;;
+;;; Offsets - [(A 0) (B -3) (C -1)]
+;;;
+;;; a b c d e
+;;; Mapping - ([ 3 0 1 3 0 ]
+;;; [ 6 3 2 9 3 ]
+;;; [ 8 6 3 15 9 ])
+;;;
+;;; (note column 'e' is different in real algorithm, which is slightly
+;;; different than described here, but this gives you the methodology.)
+;;;
+;;; The basic idea is this, when going from component->virtual, apply
+;;; the appropriate offset to the article number. Then search the first
+;;; column of the table for a row where 'a' is less than or equal to the
+;;; modified number. You can see that only group A can therefore go to
+;;; the first row, groups A and B to the second, and all to the last.
+;;; The third column of the table is telling us the number of groups
+;;; which might be able to reach that row (it might increase by more than
+;;; 1 if several groups have the same size).
+;;; Then column 'b' provides an additional offset you apply when you have
+;;; found the correct row. You then multiply by 'c' and add on the groups
+;;; _position_ in the offset table. The basic idea here is that on
+;;; any given row we are going to map back and forth using X'=X*c+Y and
+;;; X=(X'/c), Y=(X' mod c). Then once you've done this transformation,
+;;; you apply a final offset from column 'e' to give the virtual article.
+;;;
+;;; Going the other direction, you instead search on column 'd' instead
+;;; of 'a', and apply everything in reverse order.
+
+;;; Convert component -> virtual:
+;;; set num = num - Offset(group)
+;;; find first row in Mapping where num <= 'a'
+;;; num = (num-'b')*c + Position(group) + 'e'
+
+;;; Convert virtual -> component:
+;;; find first row in Mapping where num <= 'd'
+;;; num = num - 'e'
+;;; group_pos = num mod 'c'
+;;; num = (num / 'c') + 'b' + Offset(group_pos)
+
+;;; Easy no? :)
+;;;
+;;; Well actually, you need to keep column e offset smaller by the 'c'
+;;; column for that line, and always add 1 more when going from
+;;; component -> virtual. Otherwise you run into a problem with
+;;; unique reverse mapping.
+
+(defun nnvirtual-map-article (article)
+ "Return a cons of the component group and article corresponding to
+the given virtual ARTICLE."
+ (let ((table nnvirtual-mapping-table)
+ entry group-pos)
+ (while (and table
+ (> article (aref (car table) 3)))
+ (setq table (cdr table)))
+ (when (and table
+ (> article 0))
+ (setq entry (car table))
+ (setq article (- article (aref entry 4) 1))
+ (setq group-pos (mod article (aref entry 2)))
+ (cons (car (aref nnvirtual-mapping-offsets group-pos))
+ (+ (/ article (aref entry 2))
+ (aref entry 1)
+ (cdr (aref nnvirtual-mapping-offsets group-pos)))
+ ))
+ ))
+
+
+
+(defun nnvirtual-reverse-map-article (group article)
+ "Return the virtual article number corresponding to the given
+component GROUP and ARTICLE."
+ (let ((table nnvirtual-mapping-table)
+ (group-pos 0)
+ entry)
+ (while (not (string= group (car (aref nnvirtual-mapping-offsets
+ group-pos))))
+ (setq group-pos (1+ group-pos)))
+ (setq article (- article (cdr (aref nnvirtual-mapping-offsets
+ group-pos))))
+ (while (and table
+ (> article (aref (car table) 0)))
+ (setq table (cdr table)))
+ (setq entry (car table))
+ (when (and entry
+ (> article 0)
+ (< group-pos (aref entry 2))) ; article not out of range below
+ (+ (aref entry 4)
+ group-pos
+ (* (- article (aref entry 1))
+ (aref entry 2))
+ 1))
+ ))
+
+
+(defun nnvirtual-reverse-map-sequence (group articles)
+ "Return list of virtual article numbers for all ARTICLES in GROUP.
+The ARTICLES should be sorted, and can be a compressed sequence.
+If any of the article numbers has no corresponding virtual article,
+then it is left out of the result."
+ (when (numberp (cdr-safe articles))
+ (setq articles (list articles)))
+ (let (result a i j new-a)
+ (while (setq a (pop articles))
+ (if (atom a)
+ (setq i a
+ j a)
+ (setq i (car a)
+ j (cdr a)))
+ (while (<= i j)
+ ;; If this is slow, you can optimize by moving article checking
+ ;; into here. You don't have to recompute the group-pos,
+ ;; nor scan the table every time.
+ (when (setq new-a (nnvirtual-reverse-map-article group i))
+ (push new-a result))
+ (setq i (1+ i))))
+ (nreverse result)))
+
+
+(defun nnvirtual-partition-sequence (articles)
+ "Return an association list of component article numbers, indexed
+by elements of nnvirtual-component-groups, based on the sequence
+ARTICLES of virtual article numbers. ARTICLES should be sorted,
+and can be a compressed sequence. If any of the article numbers has
+no corresponding component article, then it is left out of the result."
+ (when (numberp (cdr-safe articles))
+ (setq articles (list articles)))
+ (let ((carticles (mapcar (lambda (g) (list g))
+ nnvirtual-component-groups))
+ a i j article entry)
+ (while (setq a (pop articles))
+ (if (atom a)
+ (setq i a
+ j a)
+ (setq i (car a)
+ j (cdr a)))
+ (while (<= i j)
+ (when (setq article (nnvirtual-map-article i))
+ (setq entry (assoc (car article) carticles))
+ (setcdr entry (cons (cdr article) (cdr entry))))
+ (setq i (1+ i))))
+ (mapc '(lambda (x) (setcdr x (nreverse (cdr x))))
+ carticles)
+ carticles))
+
(defun nnvirtual-create-mapping ()
- "Create an article mapping for the current group."
- (let* ((div nil)
- m 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 (incf i)))))
+ "Build the tables necessary to map between component (group, article)
+to virtual article. Generate the set of read messages and marks for
+the virtual group based on the marks on the component groups."
+ (let ((cnt 0)
+ (tot 0)
+ (M 0)
+ (i 0)
+ actives all-unreads all-marks
+ active min max size unreads marks
+ next-M next-tot
+ reads beg)
+ ;; Ok, we loop over all component groups and collect a lot of
+ ;; information:
+ ;; Into actives we place (g size max), where size is max-min+1.
+ ;; Into all-unreads we put (g unreads).
+ ;; Into all-marks we put (g marks).
+ ;; We also increment cnt and tot here, and compute M (max of sizes).
+ (mapc (lambda (g)
+ (setq active (gnus-activate-group g)
+ min (car active)
+ max (cdr active))
+ (when (and active (>= max min))
+ ;; store active information
+ (push (list g (- max min -1) max) actives)
+ ;; collect unread/mark info for later
+ (setq unreads (gnus-list-of-unread-articles g))
+ (setq marks (gnus-info-marks (gnus-get-info g)))
+ (when gnus-use-cache
+ (push (cons 'cache
+ (gnus-cache-articles-in-group g))
+ marks))
+ (push (cons g unreads) all-unreads)
+ (push (cons g marks) all-marks)
+ ;; count groups, total #articles, and max size
+ (setq size (- max min -1))
+ (setq cnt (1+ cnt)
+ tot (+ tot size)
+ M (max M size))))
+ nnvirtual-component-groups)
+
+ ;; Number of articles in the virtual group.
+ (setq nnvirtual-mapping-len tot)
+
+
+ ;; We want the actives list sorted by size, to build the tables.
+ (setq actives (sort actives (lambda (g1 g2) (< (nth 1 g1) (nth 1 g2)))))
+
+ ;; Build the offset table. Largest sized groups are at the front.
+ (setq nnvirtual-mapping-offsets
+ (vconcat
+ (nreverse
+ (mapcar (lambda (entry)
+ (cons (nth 0 entry)
+ (- (nth 2 entry) M)))
+ actives))))
+
+ ;; Build the mapping table.
+ (setq nnvirtual-mapping-table nil)
+ (setq actives (mapcar (lambda (entry) (nth 1 entry)) actives))
+ (while actives
+ (setq size (car actives))
+ (setq next-M (- M size))
+ (setq next-tot (- tot (* cnt size)))
+ ;; make current row in table
+ (push (vector M next-M cnt tot (- next-tot cnt))
+ nnvirtual-mapping-table)
+ ;; update M and tot
+ (setq M next-M)
+ (setq tot next-tot)
+ ;; subtract the current size from all entries.
+ (setq actives (mapcar (lambda (x) (- x size)) actives))
+ ;; remove anything that went to 0.
+ (while (and actives
+ (= (car actives) 0))
+ (pop actives)
+ (setq cnt (- cnt 1))))
+
+
+ ;; Now that the mapping tables are generated, we can convert
+ ;; and combine the separate component unreads and marks lists
+ ;; into single lists of virtual article numbers.
+ (setq unreads (apply 'nnvirtual-merge-sorted-lists
+ (mapcar (lambda (x)
+ (nnvirtual-reverse-map-sequence
+ (car x) (cdr x)))
+ all-unreads)))
+ (setq marks (mapcar
+ (lambda (type)
+ (cons (cdr type)
+ (gnus-compress-sequence
+ (apply
+ 'nnvirtual-merge-sorted-lists
+ (mapcar (lambda (x)
+ (nnvirtual-reverse-map-sequence
+ (car x)
+ (cdr (assq (cdr type) (cdr x)))))
+ all-marks)))))
+ gnus-article-mark-lists))
+
+ ;; Remove any empty marks lists, and store.
+ (setq nnvirtual-mapping-marks (delete-if-not 'cdr marks))
+
+ ;; We need to convert the unreads to reads. We compress the
+ ;; sequence as we go, otherwise it could be huge.
+ (while (and (<= (incf i) nnvirtual-mapping-len)
+ unreads)
+ (if (= i (car unreads))
+ (setq unreads (cdr unreads))
+ ;; try to get a range.
+ (setq beg i)
+ (while (and (<= (incf i) nnvirtual-mapping-len)
+ (not (= i (car unreads)))))
+ (setq i (- i 1))
+ (if (= i beg)
+ (push i reads)
+ (push (cons beg i) reads))
+ ))
+ (when (<= i nnvirtual-mapping-len)
+ (if (= i nnvirtual-mapping-len)
+ (push i reads)
+ (push (cons i nnvirtual-mapping-len) reads)))
+
+ ;; Store the reads list for later use.
+ (setq nnvirtual-mapping-reads (nreverse reads))
+ ))
(provide 'nnvirtual)
projects / gnus / commitdiff