+++ /dev/null
-;;; nnvirtual.el --- virtual newsgroups access for Gnus
-;; Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001
-;; Free Software Foundation, Inc.
-
-;; Author: David Moore <dmoore@ucsd.edu>
-;; Lars Magne Ingebrigtsen <larsi@gnus.org>
-;; 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:
-
-(eval-when-compile (require 'cl))
-
-(require 'nntp)
-(require 'nnheader)
-(require 'gnus)
-(require 'nnoo)
-(require 'gnus-util)
-(require 'gnus-start)
-(require 'gnus-sum)
-(require 'gnus-msg)
-
-(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.")
-
-\f
-
-(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"))
-
-\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*")))
- (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) '<)))
-
-\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-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 (= (point) (point-max))
- (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 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."
- (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)
-
-;;; nnvirtual.el ends here
projects / elisp / gnus.git- / blobdiff