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1 ;;; nnvirtual.el --- virtual newsgroups access for Gnus
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2 ;; Copyright (C) 1994,95,96,97 Free Software Foundation, Inc.
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3
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4 ;; Author: David Moore <dmoore@ucsd.edu>
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5 ;; Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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6 ;; Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
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7 ;; Keywords: news
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8
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9 ;; This file is part of GNU Emacs.
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10
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11 ;; GNU Emacs is free software; you can redistribute it and/or modify
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12 ;; it under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; GNU Emacs is distributed in the hope that it will be useful,
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17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 ;; GNU General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;;; Commentary:
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27
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28 ;; The other access methods (nntp, nnspool, etc) are general news
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29 ;; access methods. This module relies on Gnus and can not be used
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30 ;; separately.
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31
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32 ;;; Code:
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33
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34 (require 'nntp)
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35 (require 'nnheader)
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36 (require 'gnus)
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37 (require 'nnoo)
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38 (require 'gnus-util)
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39 (require 'gnus-start)
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40 (require 'gnus-sum)
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41 (eval-when-compile (require 'cl))
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42
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43 (nnoo-declare nnvirtual)
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44
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45 (defvoo nnvirtual-always-rescan nil
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46 "*If non-nil, always scan groups for unread articles when entering a group.
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47 If this variable is nil (which is the default) and you read articles
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48 in a component group after the virtual group has been activated, the
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49 read articles from the component group will show up when you enter the
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50 virtual group.")
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51
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52 (defvoo nnvirtual-component-regexp nil
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53 "*Regexp to match component groups.")
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54
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55 (defvoo nnvirtual-component-groups nil
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56 "Component group in this nnvirtual group.")
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57
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58
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59
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60 (defconst nnvirtual-version "nnvirtual 1.1")
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61
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62 (defvoo nnvirtual-current-group nil)
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63
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64 (defvoo nnvirtual-mapping-table nil
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65 "Table of rules on how to map between component group and article number
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66 to virtual article number.")
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67
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68 (defvoo nnvirtual-mapping-offsets nil
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69 "Table indexed by component group to an offset to be applied to article numbers in that group.")
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70
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71 (defvoo nnvirtual-mapping-len 0
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72 "Number of articles in this virtual group.")
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73
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74 (defvoo nnvirtual-mapping-reads nil
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75 "Compressed sequence of read articles on the virtual group as computed from the unread status of individual component groups.")
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76
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77 (defvoo nnvirtual-mapping-marks nil
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78 "Compressed marks alist for the virtual group as computed from the marks of individual component groups.")
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79
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80 (defvoo nnvirtual-info-installed nil
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81 "T if we have already installed the group info for this group, and shouldn't blast over it again.")
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82
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83 (defvoo nnvirtual-status-string "")
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84
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85 (eval-and-compile
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86 (autoload 'gnus-cache-articles-in-group "gnus-cache"))
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87
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88
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89
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90 ;;; Interface functions.
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91
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92 (nnoo-define-basics nnvirtual)
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93
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94
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95 (deffoo nnvirtual-retrieve-headers (articles &optional newsgroup
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96 server fetch-old)
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97 (when (nnvirtual-possibly-change-server server)
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98 (save-excursion
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99 (set-buffer nntp-server-buffer)
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100 (erase-buffer)
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101 (if (stringp (car articles))
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102 'headers
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103 (let ((vbuf (nnheader-set-temp-buffer
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104 (get-buffer-create " *virtual headers*")))
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105 (carticles (nnvirtual-partition-sequence articles))
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106 (system-name (system-name))
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107 cgroup carticle article result prefix)
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108 (while carticles
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109 (setq cgroup (caar carticles))
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110 (setq articles (cdar carticles))
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111 (pop carticles)
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112 (when (and articles
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113 (gnus-check-server
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114 (gnus-find-method-for-group cgroup) t)
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115 (gnus-request-group cgroup t)
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116 (setq prefix (gnus-group-real-prefix cgroup))
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117 ;; FIX FIX FIX we want to check the cache!
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118 ;; This is probably evil if people have set
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119 ;; gnus-use-cache to nil themselves, but I
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120 ;; have no way of finding the true value of it.
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121 (let ((gnus-use-cache t))
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122 (setq result (gnus-retrieve-headers
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123 articles cgroup nil))))
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124 (set-buffer nntp-server-buffer)
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125 ;; If we got HEAD headers, we convert them into NOV
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126 ;; headers. This is slow, inefficient and, come to think
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127 ;; of it, downright evil. So sue me. I couldn't be
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128 ;; bothered to write a header parse routine that could
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129 ;; parse a mixed HEAD/NOV buffer.
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130 (when (eq result 'headers)
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131 (nnvirtual-convert-headers))
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132 (goto-char (point-min))
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133 (while (not (eobp))
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134 (delete-region (point)
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135 (progn
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136 (setq carticle (read nntp-server-buffer))
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137 (point)))
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138
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139 ;; We remove this article from the articles list, if
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140 ;; anything is left in the articles list after going through
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141 ;; the entire buffer, then those articles have been
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142 ;; expired or canceled, so we appropriately update the
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143 ;; component group below. They should be coming up
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144 ;; generally in order, so this shouldn't be slow.
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145 (setq articles (delq carticle articles))
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146
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147 (setq article (nnvirtual-reverse-map-article cgroup carticle))
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148 (if (null article)
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149 ;; This line has no reverse mapping, that means it
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150 ;; was an extra article reference returned by nntp.
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151 (progn
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152 (beginning-of-line)
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153 (delete-region (point) (progn (forward-line 1) (point))))
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154 ;; Otherwise insert the virtual article number,
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155 ;; and clean up the xrefs.
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156 (princ article nntp-server-buffer)
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157 (nnvirtual-update-xref-header cgroup carticle
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158 prefix system-name)
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159 (forward-line 1))
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160 )
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161
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162 (set-buffer vbuf)
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163 (goto-char (point-max))
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164 (insert-buffer-substring nntp-server-buffer))
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165 ;; Anything left in articles is expired or canceled.
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166 ;; Could be smart and not tell it about articles already known?
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167 (when articles
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168 (gnus-group-make-articles-read cgroup articles))
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169 )
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170
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171 ;; The headers are ready for reading, so they are inserted into
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172 ;; the nntp-server-buffer, which is where Gnus expects to find
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173 ;; them.
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174 (prog1
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175 (save-excursion
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176 (set-buffer nntp-server-buffer)
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177 (erase-buffer)
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178 (insert-buffer-substring vbuf)
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179 ;; FIX FIX FIX, we should be able to sort faster than
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180 ;; this if needed, since each cgroup is sorted, we just
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181 ;; need to merge
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182 (sort-numeric-fields 1 (point-min) (point-max))
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183 'nov)
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184 (kill-buffer vbuf)))))))
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185
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186
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187 (defvoo nnvirtual-last-accessed-component-group nil)
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188
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189 (deffoo nnvirtual-request-article (article &optional group server buffer)
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190 (when (nnvirtual-possibly-change-server server)
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191 (if (stringp article)
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192 ;; This is a fetch by Message-ID.
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193 (cond
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194 ((not nnvirtual-last-accessed-component-group)
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195 (nnheader-report
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196 'nnvirtual "Don't know what server to request from"))
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197 (t
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198 (save-excursion
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199 (when buffer
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200 (set-buffer buffer))
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201 (let ((method (gnus-find-method-for-group
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202 nnvirtual-last-accessed-component-group)))
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203 (funcall (gnus-get-function method 'request-article)
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204 article nil (nth 1 method) buffer)))))
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205 ;; This is a fetch by number.
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206 (let* ((amap (nnvirtual-map-article article))
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207 (cgroup (car amap)))
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208 (cond
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209 ((not amap)
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210 (nnheader-report 'nnvirtual "No such article: %s" article))
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211 ((not (gnus-check-group cgroup))
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212 (nnheader-report
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213 'nnvirtual "Can't open server where %s exists" cgroup))
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214 ((not (gnus-request-group cgroup t))
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215 (nnheader-report 'nnvirtual "Can't open component group %s" cgroup))
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216 (t
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217 (setq nnvirtual-last-accessed-component-group cgroup)
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218 (if buffer
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219 (save-excursion
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220 (set-buffer buffer)
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221 (gnus-request-article-this-buffer (cdr amap) cgroup))
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222 (gnus-request-article (cdr amap) cgroup))))))))
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223
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224
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225 (deffoo nnvirtual-open-server (server &optional defs)
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226 (unless (assq 'nnvirtual-component-regexp defs)
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227 (push `(nnvirtual-component-regexp ,server)
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228 defs))
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229 (nnoo-change-server 'nnvirtual server defs)
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230 (if nnvirtual-component-groups
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231 t
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232 (setq nnvirtual-mapping-table nil
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233 nnvirtual-mapping-offsets nil
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234 nnvirtual-mapping-len 0
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235 nnvirtual-mapping-reads nil
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236 nnvirtual-mapping-marks nil
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237 nnvirtual-info-installed nil)
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238 (when nnvirtual-component-regexp
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239 ;; Go through the newsrc alist and find all component groups.
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240 (let ((newsrc (cdr gnus-newsrc-alist))
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241 group)
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242 (while (setq group (car (pop newsrc)))
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243 (when (string-match nnvirtual-component-regexp group) ; Match
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244 ;; Add this group to the list of component groups.
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245 (setq nnvirtual-component-groups
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246 (cons group (delete group nnvirtual-component-groups)))))))
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247 (if (not nnvirtual-component-groups)
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248 (nnheader-report 'nnvirtual "No component groups: %s" server)
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249 t)))
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250
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251
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252 (deffoo nnvirtual-request-group (group &optional server dont-check)
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253 (nnvirtual-possibly-change-server server)
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254 (setq nnvirtual-component-groups
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255 (delete (nnvirtual-current-group) nnvirtual-component-groups))
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256 (cond
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257 ((null nnvirtual-component-groups)
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258 (setq nnvirtual-current-group nil)
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259 (nnheader-report 'nnvirtual "No component groups in %s" group))
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260 (t
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261 (when (or (not dont-check)
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262 nnvirtual-always-rescan)
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263 (nnvirtual-create-mapping))
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264 (setq nnvirtual-current-group group)
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265 (nnheader-insert "211 %d 1 %d %s\n"
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266 nnvirtual-mapping-len nnvirtual-mapping-len group))))
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267
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268
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269 (deffoo nnvirtual-request-type (group &optional article)
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270 (if (not article)
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271 'unknown
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272 (let ((mart (nnvirtual-map-article article)))
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273 (when mart
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274 (gnus-request-type (car mart) (cdr mart))))))
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275
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276 (deffoo nnvirtual-request-update-mark (group article mark)
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277 (let* ((nart (nnvirtual-map-article article))
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278 (cgroup (car nart))
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279 ;; The component group might be a virtual group.
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280 (nmark (gnus-request-update-mark cgroup (cdr nart) mark)))
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281 (when (and nart
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282 (= mark nmark)
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283 (gnus-group-auto-expirable-p cgroup))
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284 (setq mark gnus-expirable-mark)))
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285 mark)
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286
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287
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288 (deffoo nnvirtual-close-group (group &optional server)
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289 (when (and (nnvirtual-possibly-change-server server)
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290 (not (gnus-ephemeral-group-p (nnvirtual-current-group))))
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291 (nnvirtual-update-read-and-marked t t))
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292 t)
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293
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294
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295 (deffoo nnvirtual-request-list (&optional server)
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296 (nnheader-report 'nnvirtual "LIST is not implemented."))
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297
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298
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299 (deffoo nnvirtual-request-newgroups (date &optional server)
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300 (nnheader-report 'nnvirtual "NEWGROUPS is not supported."))
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301
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302
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303 (deffoo nnvirtual-request-list-newsgroups (&optional server)
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304 (nnheader-report 'nnvirtual "LIST NEWSGROUPS is not implemented."))
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305
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306
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307 (deffoo nnvirtual-request-update-info (group info &optional server)
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308 (when (and (nnvirtual-possibly-change-server server)
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309 (not nnvirtual-info-installed))
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310 ;; Install the precomputed lists atomically, so the virtual group
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311 ;; is not left in a half-way state in case of C-g.
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312 (gnus-atomic-progn
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313 (setcar (cddr info) nnvirtual-mapping-reads)
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314 (if (nthcdr 3 info)
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315 (setcar (nthcdr 3 info) nnvirtual-mapping-marks)
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316 (when nnvirtual-mapping-marks
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317 (setcdr (nthcdr 2 info) (list nnvirtual-mapping-marks))))
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318 (setq nnvirtual-info-installed t))
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319 t))
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320
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321
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322 (deffoo nnvirtual-catchup-group (group &optional server all)
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323 (when (and (nnvirtual-possibly-change-server server)
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324 (not (gnus-ephemeral-group-p (nnvirtual-current-group))))
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325 ;; copy over existing marks first, in case they set anything
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326 (nnvirtual-update-read-and-marked nil nil)
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327 ;; do a catchup on all component groups
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328 (let ((gnus-group-marked (copy-sequence nnvirtual-component-groups))
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329 (gnus-expert-user t))
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330 ;; Make sure all groups are activated.
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331 (mapcar
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332 (lambda (g)
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333 (when (not (numberp (car (gnus-gethash g gnus-newsrc-hashtb))))
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334 (gnus-activate-group g)))
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335 nnvirtual-component-groups)
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336 (save-excursion
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337 (set-buffer gnus-group-buffer)
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338 (gnus-group-catchup-current nil all)))))
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339
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340
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341 (deffoo nnvirtual-find-group-art (group article)
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342 "Return the real group and article for virtual GROUP and ARTICLE."
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343 (nnvirtual-map-article article))
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344
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345
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346 ;;; Internal functions.
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347
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348 (defun nnvirtual-convert-headers ()
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349 "Convert HEAD headers into NOV headers."
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350 (save-excursion
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351 (set-buffer nntp-server-buffer)
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352 (let* ((dependencies (make-vector 100 0))
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353 (headers (gnus-get-newsgroup-headers dependencies))
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354 header)
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355 (erase-buffer)
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356 (while (setq header (pop headers))
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357 (nnheader-insert-nov header)))))
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358
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359
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360 (defun nnvirtual-update-xref-header (group article prefix system-name)
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361 "Edit current NOV header in current buffer to have an xref to the component group, and also server prefix any existing xref lines."
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362 ;; Move to beginning of Xref field, creating a slot if needed.
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363 (beginning-of-line)
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364 (looking-at
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365 "[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t[^\t]*\t")
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366 (goto-char (match-end 0))
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367 (unless (search-forward "\t" (gnus-point-at-eol) 'move)
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368 (insert "\t"))
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369
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370 ;; Remove any spaces at the beginning of the Xref field.
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371 (while (= (char-after (1- (point))) ? )
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372 (forward-char -1)
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373 (delete-char 1))
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374
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375 (insert "Xref: " system-name " " group ":")
|
|
|
376 (princ article (current-buffer))
|
|
|
377
|
|
|
378 ;; If there were existing xref lines, clean them up to have the correct
|
|
|
379 ;; component server prefix.
|
|
|
380 (let ((xref-end (save-excursion
|
|
18
|
381 (search-forward "\t" (gnus-point-at-eol) 'move)
|
|
16
|
382 (point)))
|
|
|
383 (len (length prefix)))
|
|
|
384 (unless (= (point) xref-end)
|
|
|
385 (insert " ")
|
|
|
386 (when (not (string= "" prefix))
|
|
|
387 (while (re-search-forward "[^ ]+:[0-9]+" xref-end t)
|
|
|
388 (save-excursion
|
|
|
389 (goto-char (match-beginning 0))
|
|
|
390 (insert prefix))
|
|
|
391 (setq xref-end (+ xref-end len)))
|
|
|
392 )))
|
|
|
393
|
|
|
394 ;; Ensure a trailing \t.
|
|
|
395 (end-of-line)
|
|
|
396 (or (= (char-after (1- (point))) ?\t)
|
|
|
397 (insert ?\t)))
|
|
|
398
|
|
|
399
|
|
0
|
400 (defun nnvirtual-possibly-change-server (server)
|
|
|
401 (or (not server)
|
|
|
402 (nnoo-current-server-p 'nnvirtual server)
|
|
|
403 (nnvirtual-open-server server)))
|
|
|
404
|
|
16
|
405
|
|
|
406 (defun nnvirtual-update-read-and-marked (read-p update-p)
|
|
|
407 "Copy marks from the virtual group to the component groups.
|
|
|
408 If READ-P is not nil, update the (un)read status of the components.
|
|
|
409 If UPDATE-P is not nil, call gnus-group-update-group on the components."
|
|
18
|
410 (when nnvirtual-current-group
|
|
|
411 (let ((unreads (and read-p
|
|
30
|
412 (nnvirtual-partition-sequence
|
|
|
413 (gnus-list-of-unread-articles
|
|
18
|
414 (nnvirtual-current-group)))))
|
|
|
415 (type-marks (mapcar (lambda (ml)
|
|
|
416 (cons (car ml)
|
|
|
417 (nnvirtual-partition-sequence (cdr ml))))
|
|
|
418 (gnus-info-marks (gnus-get-info
|
|
|
419 (nnvirtual-current-group)))))
|
|
|
420 mark type groups carticles info entry)
|
|
16
|
421
|
|
18
|
422 ;; Ok, atomically move all of the (un)read info, clear any old
|
|
|
423 ;; marks, and move all of the current marks. This way if someone
|
|
|
424 ;; hits C-g, you won't leave the component groups in a half-way state.
|
|
|
425 (gnus-atomic-progn
|
|
|
426 ;; move (un)read
|
|
|
427 (let ((gnus-newsgroup-active nil)) ;workaround guns-update-read-articles
|
|
|
428 (while (setq entry (pop unreads))
|
|
|
429 (gnus-update-read-articles (car entry) (cdr entry))))
|
|
0
|
430
|
|
18
|
431 ;; clear all existing marks on the component groups
|
|
|
432 (setq groups nnvirtual-component-groups)
|
|
|
433 (while groups
|
|
|
434 (when (and (setq info (gnus-get-info (pop groups)))
|
|
|
435 (gnus-info-marks info))
|
|
|
436 (gnus-info-set-marks info nil)))
|
|
30
|
437
|
|
18
|
438 ;; Ok, currently type-marks is an assq list with keys of a mark type,
|
|
|
439 ;; with data of an assq list with keys of component group names
|
|
|
440 ;; and the articles which correspond to that key/group pair.
|
|
|
441 (while (setq mark (pop type-marks))
|
|
|
442 (setq type (car mark))
|
|
|
443 (setq groups (cdr mark))
|
|
|
444 (while (setq carticles (pop groups))
|
|
30
|
445 (gnus-add-marked-articles (car carticles) type (cdr carticles)
|
|
18
|
446 nil t))))
|
|
30
|
447
|
|
18
|
448 ;; possibly update the display, it is really slow
|
|
|
449 (when update-p
|
|
|
450 (setq groups nnvirtual-component-groups)
|
|
|
451 (while groups
|
|
|
452 (gnus-group-update-group (pop groups) t))))))
|
|
16
|
453
|
|
0
|
454
|
|
|
455 (defun nnvirtual-current-group ()
|
|
|
456 "Return the prefixed name of the current nnvirtual group."
|
|
|
457 (concat "nnvirtual:" nnvirtual-current-group))
|
|
|
458
|
|
16
|
459
|
|
|
460
|
|
|
461 ;;; This is currently O(kn^2) to merge n lists of length k.
|
|
|
462 ;;; You could do it in O(knlogn), but we have a small n, and the
|
|
|
463 ;;; overhead of the other approach is probably greater.
|
|
|
464 (defun nnvirtual-merge-sorted-lists (&rest lists)
|
|
|
465 "Merge many sorted lists of numbers."
|
|
|
466 (if (null (cdr lists))
|
|
|
467 (car lists)
|
|
|
468 (apply 'nnvirtual-merge-sorted-lists
|
|
|
469 (merge 'list (car lists) (cadr lists) '<)
|
|
|
470 (cddr lists))))
|
|
|
471
|
|
|
472
|
|
|
473
|
|
|
474 ;;; We map between virtual articles and real articles in a manner
|
|
|
475 ;;; which keeps the size of the virtual active list the same as
|
|
|
476 ;;; the sum of the component active lists.
|
|
|
477 ;;; To achieve fair mixing of the groups, the last article in
|
|
|
478 ;;; each of N component groups will be in the the last N articles
|
|
|
479 ;;; in the virtual group.
|
|
|
480
|
|
|
481 ;;; If you have 3 components A, B and C, with articles 1-8, 1-5, and 6-7
|
|
|
482 ;;; resprectively, then the virtual article numbers look like:
|
|
|
483 ;;;
|
|
|
484 ;;; 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
|
|
|
485 ;;; A1 A2 A3 A4 B1 A5 B2 A6 B3 A7 B4 C6 A8 B5 C7
|
|
|
486
|
|
|
487 ;;; To compute these mappings we generate a couple tables and then
|
|
|
488 ;;; do some fast operations on them. Tables for the example above:
|
|
|
489 ;;;
|
|
|
490 ;;; Offsets - [(A 0) (B -3) (C -1)]
|
|
|
491 ;;;
|
|
|
492 ;;; a b c d e
|
|
|
493 ;;; Mapping - ([ 3 0 1 3 0 ]
|
|
|
494 ;;; [ 6 3 2 9 3 ]
|
|
|
495 ;;; [ 8 6 3 15 9 ])
|
|
|
496 ;;;
|
|
|
497 ;;; (note column 'e' is different in real algorithm, which is slightly
|
|
|
498 ;;; different than described here, but this gives you the methodology.)
|
|
|
499 ;;;
|
|
|
500 ;;; The basic idea is this, when going from component->virtual, apply
|
|
|
501 ;;; the appropriate offset to the article number. Then search the first
|
|
|
502 ;;; column of the table for a row where 'a' is less than or equal to the
|
|
|
503 ;;; modified number. You can see that only group A can therefore go to
|
|
|
504 ;;; the first row, groups A and B to the second, and all to the last.
|
|
|
505 ;;; The third column of the table is telling us the number of groups
|
|
|
506 ;;; which might be able to reach that row (it might increase by more than
|
|
|
507 ;;; 1 if several groups have the same size).
|
|
|
508 ;;; Then column 'b' provides an additional offset you apply when you have
|
|
|
509 ;;; found the correct row. You then multiply by 'c' and add on the groups
|
|
|
510 ;;; _position_ in the offset table. The basic idea here is that on
|
|
|
511 ;;; any given row we are going to map back and forth using X'=X*c+Y and
|
|
|
512 ;;; X=(X'/c), Y=(X' mod c). Then once you've done this transformation,
|
|
|
513 ;;; you apply a final offset from column 'e' to give the virtual article.
|
|
|
514 ;;;
|
|
|
515 ;;; Going the other direction, you instead search on column 'd' instead
|
|
|
516 ;;; of 'a', and apply everything in reverse order.
|
|
|
517
|
|
|
518 ;;; Convert component -> virtual:
|
|
|
519 ;;; set num = num - Offset(group)
|
|
|
520 ;;; find first row in Mapping where num <= 'a'
|
|
|
521 ;;; num = (num-'b')*c + Position(group) + 'e'
|
|
|
522
|
|
|
523 ;;; Convert virtual -> component:
|
|
|
524 ;;; find first row in Mapping where num <= 'd'
|
|
|
525 ;;; num = num - 'e'
|
|
|
526 ;;; group_pos = num mod 'c'
|
|
|
527 ;;; num = (num / 'c') + 'b' + Offset(group_pos)
|
|
|
528
|
|
|
529 ;;; Easy no? :)
|
|
|
530 ;;;
|
|
|
531 ;;; Well actually, you need to keep column e offset smaller by the 'c'
|
|
|
532 ;;; column for that line, and always add 1 more when going from
|
|
|
533 ;;; component -> virtual. Otherwise you run into a problem with
|
|
|
534 ;;; unique reverse mapping.
|
|
|
535
|
|
|
536 (defun nnvirtual-map-article (article)
|
|
|
537 "Return a cons of the component group and article corresponding to the given virtual ARTICLE."
|
|
|
538 (let ((table nnvirtual-mapping-table)
|
|
|
539 entry group-pos)
|
|
|
540 (while (and table
|
|
|
541 (> article (aref (car table) 3)))
|
|
|
542 (setq table (cdr table)))
|
|
|
543 (when (and table
|
|
|
544 (> article 0))
|
|
|
545 (setq entry (car table))
|
|
|
546 (setq article (- article (aref entry 4) 1))
|
|
|
547 (setq group-pos (mod article (aref entry 2)))
|
|
|
548 (cons (car (aref nnvirtual-mapping-offsets group-pos))
|
|
|
549 (+ (/ article (aref entry 2))
|
|
|
550 (aref entry 1)
|
|
|
551 (cdr (aref nnvirtual-mapping-offsets group-pos)))
|
|
|
552 ))
|
|
|
553 ))
|
|
|
554
|
|
|
555
|
|
|
556
|
|
|
557 (defun nnvirtual-reverse-map-article (group article)
|
|
|
558 "Return the virtual article number corresponding to the given component GROUP and ARTICLE."
|
|
|
559 (let ((table nnvirtual-mapping-table)
|
|
|
560 (group-pos 0)
|
|
|
561 entry)
|
|
|
562 (while (not (string= group (car (aref nnvirtual-mapping-offsets
|
|
|
563 group-pos))))
|
|
|
564 (setq group-pos (1+ group-pos)))
|
|
|
565 (setq article (- article (cdr (aref nnvirtual-mapping-offsets
|
|
|
566 group-pos))))
|
|
|
567 (while (and table
|
|
|
568 (> article (aref (car table) 0)))
|
|
|
569 (setq table (cdr table)))
|
|
|
570 (setq entry (car table))
|
|
|
571 (when (and entry
|
|
|
572 (> article 0)
|
|
|
573 (< group-pos (aref entry 2))) ; article not out of range below
|
|
|
574 (+ (aref entry 4)
|
|
|
575 group-pos
|
|
|
576 (* (- article (aref entry 1))
|
|
|
577 (aref entry 2))
|
|
|
578 1))
|
|
|
579 ))
|
|
|
580
|
|
|
581
|
|
|
582 (defun nnvirtual-reverse-map-sequence (group articles)
|
|
|
583 "Return list of virtual article numbers for all ARTICLES in GROUP.
|
|
|
584 The ARTICLES should be sorted, and can be a compressed sequence.
|
|
|
585 If any of the article numbers has no corresponding virtual article,
|
|
|
586 then it is left out of the result."
|
|
|
587 (when (numberp (cdr-safe articles))
|
|
|
588 (setq articles (list articles)))
|
|
|
589 (let (result a i j new-a)
|
|
|
590 (while (setq a (pop articles))
|
|
|
591 (if (atom a)
|
|
|
592 (setq i a
|
|
|
593 j a)
|
|
|
594 (setq i (car a)
|
|
|
595 j (cdr a)))
|
|
|
596 (while (<= i j)
|
|
|
597 ;; If this is slow, you can optimize by moving article checking
|
|
|
598 ;; into here. You don't have to recompute the group-pos,
|
|
|
599 ;; nor scan the table every time.
|
|
|
600 (when (setq new-a (nnvirtual-reverse-map-article group i))
|
|
|
601 (push new-a result))
|
|
|
602 (setq i (1+ i))))
|
|
|
603 (nreverse result)))
|
|
|
604
|
|
|
605
|
|
|
606 (defun nnvirtual-partition-sequence (articles)
|
|
|
607 "Return an association list of component article numbers.
|
|
|
608 These are indexed by elements of nnvirtual-component-groups, based on
|
|
|
609 the sequence ARTICLES of virtual article numbers. ARTICLES should be
|
|
|
610 sorted, and can be a compressed sequence. If any of the article
|
|
|
611 numbers has no corresponding component article, then it is left out of
|
|
|
612 the result."
|
|
|
613 (when (numberp (cdr-safe articles))
|
|
|
614 (setq articles (list articles)))
|
|
|
615 (let ((carticles (mapcar (lambda (g) (list g))
|
|
|
616 nnvirtual-component-groups))
|
|
|
617 a i j article entry)
|
|
|
618 (while (setq a (pop articles))
|
|
|
619 (if (atom a)
|
|
|
620 (setq i a
|
|
|
621 j a)
|
|
|
622 (setq i (car a)
|
|
|
623 j (cdr a)))
|
|
|
624 (while (<= i j)
|
|
|
625 (when (setq article (nnvirtual-map-article i))
|
|
|
626 (setq entry (assoc (car article) carticles))
|
|
|
627 (setcdr entry (cons (cdr article) (cdr entry))))
|
|
|
628 (setq i (1+ i))))
|
|
|
629 (mapc '(lambda (x) (setcdr x (nreverse (cdr x))))
|
|
|
630 carticles)
|
|
|
631 carticles))
|
|
|
632
|
|
0
|
633
|
|
|
634 (defun nnvirtual-create-mapping ()
|
|
30
|
635 "Build the tables necessary to map between component (group, article) to virtual article.
|
|
16
|
636 Generate the set of read messages and marks for the virtual group
|
|
|
637 based on the marks on the component groups."
|
|
|
638 (let ((cnt 0)
|
|
|
639 (tot 0)
|
|
|
640 (M 0)
|
|
|
641 (i 0)
|
|
|
642 actives all-unreads all-marks
|
|
|
643 active min max size unreads marks
|
|
|
644 next-M next-tot
|
|
|
645 reads beg)
|
|
|
646 ;; Ok, we loop over all component groups and collect a lot of
|
|
|
647 ;; information:
|
|
|
648 ;; Into actives we place (g size max), where size is max-min+1.
|
|
|
649 ;; Into all-unreads we put (g unreads).
|
|
|
650 ;; Into all-marks we put (g marks).
|
|
|
651 ;; We also increment cnt and tot here, and compute M (max of sizes).
|
|
|
652 (mapc (lambda (g)
|
|
|
653 (setq active (gnus-activate-group g)
|
|
|
654 min (car active)
|
|
|
655 max (cdr active))
|
|
|
656 (when (and active (>= max min) (not (zerop max)))
|
|
|
657 ;; store active information
|
|
|
658 (push (list g (- max min -1) max) actives)
|
|
|
659 ;; collect unread/mark info for later
|
|
|
660 (setq unreads (gnus-list-of-unread-articles g))
|
|
|
661 (setq marks (gnus-info-marks (gnus-get-info g)))
|
|
|
662 (when gnus-use-cache
|
|
|
663 (push (cons 'cache
|
|
|
664 (gnus-cache-articles-in-group g))
|
|
|
665 marks))
|
|
|
666 (push (cons g unreads) all-unreads)
|
|
|
667 (push (cons g marks) all-marks)
|
|
|
668 ;; count groups, total #articles, and max size
|
|
|
669 (setq size (- max min -1))
|
|
|
670 (setq cnt (1+ cnt)
|
|
|
671 tot (+ tot size)
|
|
|
672 M (max M size))))
|
|
|
673 nnvirtual-component-groups)
|
|
|
674
|
|
|
675 ;; Number of articles in the virtual group.
|
|
|
676 (setq nnvirtual-mapping-len tot)
|
|
|
677
|
|
|
678
|
|
|
679 ;; We want the actives list sorted by size, to build the tables.
|
|
|
680 (setq actives (sort actives (lambda (g1 g2) (< (nth 1 g1) (nth 1 g2)))))
|
|
30
|
681
|
|
16
|
682 ;; Build the offset table. Largest sized groups are at the front.
|
|
|
683 (setq nnvirtual-mapping-offsets
|
|
|
684 (vconcat
|
|
|
685 (nreverse
|
|
|
686 (mapcar (lambda (entry)
|
|
|
687 (cons (nth 0 entry)
|
|
|
688 (- (nth 2 entry) M)))
|
|
|
689 actives))))
|
|
30
|
690
|
|
16
|
691 ;; Build the mapping table.
|
|
|
692 (setq nnvirtual-mapping-table nil)
|
|
|
693 (setq actives (mapcar (lambda (entry) (nth 1 entry)) actives))
|
|
|
694 (while actives
|
|
|
695 (setq size (car actives))
|
|
|
696 (setq next-M (- M size))
|
|
|
697 (setq next-tot (- tot (* cnt size)))
|
|
|
698 ;; make current row in table
|
|
|
699 (push (vector M next-M cnt tot (- next-tot cnt))
|
|
|
700 nnvirtual-mapping-table)
|
|
|
701 ;; update M and tot
|
|
|
702 (setq M next-M)
|
|
|
703 (setq tot next-tot)
|
|
|
704 ;; subtract the current size from all entries.
|
|
|
705 (setq actives (mapcar (lambda (x) (- x size)) actives))
|
|
|
706 ;; remove anything that went to 0.
|
|
|
707 (while (and actives
|
|
|
708 (= (car actives) 0))
|
|
|
709 (pop actives)
|
|
|
710 (setq cnt (- cnt 1))))
|
|
|
711
|
|
|
712
|
|
|
713 ;; Now that the mapping tables are generated, we can convert
|
|
|
714 ;; and combine the separate component unreads and marks lists
|
|
|
715 ;; into single lists of virtual article numbers.
|
|
|
716 (setq unreads (apply 'nnvirtual-merge-sorted-lists
|
|
|
717 (mapcar (lambda (x)
|
|
|
718 (nnvirtual-reverse-map-sequence
|
|
|
719 (car x) (cdr x)))
|
|
|
720 all-unreads)))
|
|
|
721 (setq marks (mapcar
|
|
|
722 (lambda (type)
|
|
|
723 (cons (cdr type)
|
|
|
724 (gnus-compress-sequence
|
|
|
725 (apply
|
|
|
726 'nnvirtual-merge-sorted-lists
|
|
|
727 (mapcar (lambda (x)
|
|
|
728 (nnvirtual-reverse-map-sequence
|
|
|
729 (car x)
|
|
|
730 (cdr (assq (cdr type) (cdr x)))))
|
|
|
731 all-marks)))))
|
|
|
732 gnus-article-mark-lists))
|
|
|
733
|
|
|
734 ;; Remove any empty marks lists, and store.
|
|
|
735 (setq nnvirtual-mapping-marks (delete-if-not 'cdr marks))
|
|
|
736
|
|
|
737 ;; We need to convert the unreads to reads. We compress the
|
|
|
738 ;; sequence as we go, otherwise it could be huge.
|
|
|
739 (while (and (<= (incf i) nnvirtual-mapping-len)
|
|
|
740 unreads)
|
|
|
741 (if (= i (car unreads))
|
|
|
742 (setq unreads (cdr unreads))
|
|
|
743 ;; try to get a range.
|
|
|
744 (setq beg i)
|
|
|
745 (while (and (<= (incf i) nnvirtual-mapping-len)
|
|
|
746 (not (= i (car unreads)))))
|
|
|
747 (setq i (- i 1))
|
|
|
748 (if (= i beg)
|
|
|
749 (push i reads)
|
|
|
750 (push (cons beg i) reads))
|
|
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751 ))
|
|
|
752 (when (<= i nnvirtual-mapping-len)
|
|
|
753 (if (= i nnvirtual-mapping-len)
|
|
|
754 (push i reads)
|
|
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755 (push (cons i nnvirtual-mapping-len) reads)))
|
|
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756
|
|
|
757 ;; Store the reads list for later use.
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|
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758 (setq nnvirtual-mapping-reads (nreverse reads))
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759
|
|
|
760 ;; Throw flag to show we changed the info.
|
|
|
761 (setq nnvirtual-info-installed nil)
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|
|
762 ))
|
|
0
|
763
|
|
|
764 (provide 'nnvirtual)
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|
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765
|
|
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766 ;;; nnvirtual.el ends here
|
