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[Emacs-diffs] Changes to emacs/lisp/gnus/nnvirtual.el [gnus-5_10-branch]
From: |
Andreas Schwab |
Subject: |
[Emacs-diffs] Changes to emacs/lisp/gnus/nnvirtual.el [gnus-5_10-branch] |
Date: |
Thu, 22 Jul 2004 13:14:21 -0400 |
Index: emacs/lisp/gnus/nnvirtual.el
diff -c /dev/null emacs/lisp/gnus/nnvirtual.el:1.10.2.1
*** /dev/null Thu Jul 22 16:47:19 2004
--- emacs/lisp/gnus/nnvirtual.el Thu Jul 22 16:45:51 2004
***************
*** 0 ****
--- 1,822 ----
+ ;;; nnvirtual.el --- virtual newsgroups access for Gnus
+ ;; Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
+ ;; Free Software Foundation, Inc.
+
+ ;; Author: David Moore <address@hidden>
+ ;; Lars Magne Ingebrigtsen <address@hidden>
+ ;; Masanobu UMEDA <address@hidden>
+ ;; 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)
+ (require 'gnus-util)
+ (require 'gnus-start)
+ (require 'gnus-sum)
+ (require 'gnus-msg)
+ (eval-when-compile (require 'cl))
+
+ (nnoo-declare nnvirtual)
+
+ (defvoo nnvirtual-always-rescan t
+ "If non-nil, always scan groups for unread articles when entering a group.
+ If this variable is nil 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.")
+
+ (defvoo nnvirtual-component-groups nil
+ "Component group in this nnvirtual group.")
+
+
+
+ (defconst nnvirtual-version "nnvirtual 1.1")
+
+ (defvoo nnvirtual-current-group 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-info-installed nil
+ "T if we have already installed the group info for this group, and
shouldn't blast over it again.")
+
+ (defvoo nnvirtual-status-string "")
+
+ (eval-and-compile
+ (autoload 'gnus-cache-articles-in-group "gnus-cache"))
+
+
+
+ ;;; 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*")))
+ (carticles (nnvirtual-partition-sequence articles))
+ (system-name (system-name))
+ 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))
+ ;; 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)
+ (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
+ ;; them.
+ (prog1
+ (save-excursion
+ (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)))))))
+
+
+ (defvoo nnvirtual-last-accessed-component-group nil)
+
+ (deffoo nnvirtual-request-article (article &optional group server buffer)
+ (when (nnvirtual-possibly-change-server server)
+ (if (stringp article)
+ ;; This is a fetch by Message-ID.
+ (cond
+ ((not nnvirtual-last-accessed-component-group)
+ (nnheader-report
+ 'nnvirtual "Don't know what server to request from"))
+ (t
+ (save-excursion
+ (when buffer
+ (set-buffer buffer))
+ (let* ((gnus-override-method nil)
+ (method (gnus-find-method-for-group
+ nnvirtual-last-accessed-component-group)))
+ (funcall (gnus-get-function method 'request-article)
+ article nil (nth 1 method) buffer)))))
+ ;; This is a fetch by number.
+ (let* ((amap (nnvirtual-map-article article))
+ (cgroup (car 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
+ (setq nnvirtual-last-accessed-component-group cgroup)
+ (if buffer
+ (save-excursion
+ (set-buffer buffer)
+ ;; We bind this here to avoid double decoding.
+ (let ((gnus-article-decode-hook nil))
+ (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)
+ (push `(nnvirtual-component-regexp ,server)
+ defs))
+ (nnoo-change-server 'nnvirtual server defs)
+ (if nnvirtual-component-groups
+ t
+ (setq nnvirtual-mapping-table nil
+ nnvirtual-mapping-offsets nil
+ nnvirtual-mapping-len 0
+ nnvirtual-mapping-reads nil
+ nnvirtual-mapping-marks nil
+ nnvirtual-info-installed nil)
+ (when nnvirtual-component-regexp
+ ;; 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
+ (setq nnvirtual-current-group group)
+ (when (or (not dont-check)
+ nnvirtual-always-rescan)
+ (nnvirtual-create-mapping)
+ (when nnvirtual-always-rescan
+ (nnvirtual-request-update-info
+ (nnvirtual-current-group)
+ (gnus-get-info (nnvirtual-current-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
+ (if (numberp article)
+ (let ((mart (nnvirtual-map-article article)))
+ (if mart
+ (gnus-request-type (car mart) (cdr mart))))
+ (gnus-request-type
+ nnvirtual-last-accessed-component-group nil))))
+
+ (deffoo nnvirtual-request-update-mark (group article mark)
+ (let* ((nart (nnvirtual-map-article article))
+ (cgroup (car nart)))
+ (when (and nart
+ (memq mark gnus-auto-expirable-marks)
+ ;; The component group might be a virtual group.
+ (= mark (gnus-request-update-mark cgroup (cdr nart) mark))
+ (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))))
+ (nnvirtual-update-read-and-marked t 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 (and (nnvirtual-possibly-change-server server)
+ (not nnvirtual-info-installed))
+ ;; Install the precomputed lists atomically, so the virtual group
+ ;; is not left in a half-way state in case of C-g.
+ (gnus-atomic-progn
+ (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))))
+ (setq nnvirtual-info-installed t))
+ t))
+
+
+ (deffoo nnvirtual-catchup-group (group &optional server 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-read-and-marked nil 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."
+ (nnvirtual-map-article article))
+
+
+ (deffoo nnvirtual-request-post (&optional server)
+ (if (not gnus-message-group-art)
+ (nnheader-report 'nnvirtual "Can't post to an nnvirtual group")
+ (let ((group (car (nnvirtual-find-group-art
+ (car gnus-message-group-art)
+ (cdr gnus-message-group-art)))))
+ (gnus-request-post (gnus-find-method-for-group group)))))
+
+
+ (deffoo nnvirtual-request-expire-articles (articles group
+ &optional server force)
+ (nnvirtual-possibly-change-server server)
+ (setq nnvirtual-component-groups
+ (delete (nnvirtual-current-group) nnvirtual-component-groups))
+ (let (unexpired)
+ (dolist (group nnvirtual-component-groups)
+ (setq unexpired (nconc unexpired
+ (mapcar
+ #'(lambda (article)
+ (nnvirtual-reverse-map-article
+ group article))
+ (gnus-uncompress-range
+ (gnus-group-expire-articles-1 group))))))
+ (sort (delq nil unexpired) '<)))
+
+
+ ;;; 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-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 (eq (char-after (1- (point))) ? )
+ (forward-char -1)
+ (delete-char 1))
+
+ (insert "Xref: " system-name " " group ":")
+ (princ article (current-buffer))
+ (insert " ")
+
+ ;; If there were existing xref lines, clean them up to have the correct
+ ;; component server prefix.
+ (save-restriction
+ (narrow-to-region (point)
+ (or (search-forward "\t" (gnus-point-at-eol) t)
+ (gnus-point-at-eol)))
+ (goto-char (point-min))
+ (when (re-search-forward "Xref: *[^\n:0-9 ]+ *" nil t)
+ (replace-match "" t t))
+ (goto-char (point-min))
+ (when (re-search-forward
+ (concat (regexp-quote (gnus-group-real-name group)) ":[0-9]+")
+ nil t)
+ (replace-match "" t t))
+ (unless (eobp)
+ (insert " ")
+ (when (not (string= "" prefix))
+ (while (re-search-forward "[^ ]+:[0-9]+" nil t)
+ (save-excursion
+ (goto-char (match-beginning 0))
+ (insert prefix))))))
+
+ ;; Ensure a trailing \t.
+ (end-of-line)
+ (or (eq (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-read-and-marked (read-p update-p)
+ "Copy marks from the virtual group to the component groups.
+ If READ-P is not nil, update the (un)read status of the components.
+ If UPDATE-P is not nil, call gnus-group-update-group on the components."
+ (when nnvirtual-current-group
+ (let ((unreads (and read-p
+ (nnvirtual-partition-sequence
+ (gnus-list-of-unread-articles
+ (nnvirtual-current-group)))))
+ (type-marks
+ (delq nil
+ (mapcar (lambda (ml)
+ (if (eq (car ml) 'score)
+ nil
+ (cons (car ml)
+ (nnvirtual-partition-sequence (cdr ml)))))
+ (gnus-info-marks (gnus-get-info
+ (nnvirtual-current-group))))))
+ mark type groups carticles info entry)
+
+ ;; Ok, atomically move all of the (un)read info, clear any old
+ ;; marks, and move all of the current marks. This way if someone
+ ;; hits C-g, you won't leave the component groups in a half-way state.
+ (progn
+ ;; move (un)read
+ ;; bind for workaround guns-update-read-articles
+ (let ((gnus-newsgroup-active nil))
+ (while (setq entry (pop unreads))
+ (gnus-update-read-articles (car entry) (cdr entry))))
+
+ ;; clear all existing marks on the component groups
+ (setq groups nnvirtual-component-groups)
+ (while groups
+ (when (and (setq info (gnus-get-info (pop groups)))
+ (gnus-info-marks info))
+ (gnus-info-set-marks
+ info
+ (if (assq 'score (gnus-info-marks info))
+ (list (assq 'score (gnus-info-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))
+
+
+
+ ;;; 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)
+ (sort (apply 'nconc 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 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 respectively, 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."
+ (when (numberp 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))
+ )))
+
+
+ (defsubst 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.
+ These are 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))))
+ (mapcar (lambda (x) (setcdr x (nreverse (cdr x))))
+ carticles)
+ carticles))
+
+
+ (defun nnvirtual-create-mapping ()
+ "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).
+ (mapcar (lambda (g)
+ (setq active (gnus-activate-group g)
+ min (car active)
+ max (cdr active))
+ (when (and active (>= max min) (not (zerop max)))
+ ;; 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 nil)
+ (while marks
+ (if (cdr (car marks))
+ (push (car marks) nnvirtual-mapping-marks))
+ (setq marks (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))
+
+ ;; Throw flag to show we changed the info.
+ (setq nnvirtual-info-installed nil)
+ ))
+
+ (provide 'nnvirtual)
+
+ ;;; arch-tag: ca8c8ad9-1bd8-4b0f-9722-90dc645a45f5
+ ;;; nnvirtual.el ends here
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