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1 ;;; nnkiboze.el --- select virtual news access for Gnus
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2 ;; Copyright (C) 1995,96 Free Software Foundation, Inc.
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3
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4 ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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5 ;; Keywords: news
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6
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7 ;; This file is part of GNU Emacs.
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8
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9 ;; GNU Emacs is free software; you can redistribute it and/or modify
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10 ;; it under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; GNU Emacs is distributed in the hope that it will be useful,
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15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 ;; GNU General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 ;; Boston, MA 02111-1307, USA.
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23
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24 ;;; Commentary:
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25
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26 ;; The other access methods (nntp, nnspool, etc) are general news
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27 ;; access methods. This module relies on Gnus and can not be used
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28 ;; separately.
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29
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30 ;;; Code:
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31
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32 (require 'nntp)
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33 (require 'nnheader)
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34 (require 'gnus)
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35 (require 'gnus-score)
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36 (require 'nnoo)
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37 (eval-when-compile (require 'cl))
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38
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39 (nnoo-declare nnkiboze)
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40 (defvoo nnkiboze-directory gnus-directory
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41 "nnkiboze will put its files in this directory.")
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42
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43 (defvoo nnkiboze-level 9
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44 "*The maximum level to be searched for articles.")
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45
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46 (defvoo nnkiboze-remove-read-articles t
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47 "*If non-nil, nnkiboze will remove read articles from the kiboze group.")
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48
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49
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50
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51 (defconst nnkiboze-version "nnkiboze 1.0"
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52 "Version numbers of this version of nnkiboze.")
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53
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54 (defvoo nnkiboze-current-group nil)
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55 (defvoo nnkiboze-current-score-group "")
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56 (defvoo nnkiboze-status-string "")
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57
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58
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59
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60 ;;; Interface functions.
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61
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62 (nnoo-define-basics nnkiboze)
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63
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64 (deffoo nnkiboze-retrieve-headers (articles &optional group server fetch-old)
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65 (nnkiboze-possibly-change-newsgroups group)
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66 (if gnus-nov-is-evil
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67 nil
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68 (if (stringp (car articles))
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69 'headers
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70 (let ((first (car articles))
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71 (last (progn (while (cdr articles) (setq articles (cdr articles)))
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72 (car articles)))
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73 (nov (nnkiboze-nov-file-name)))
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74 (if (file-exists-p nov)
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75 (save-excursion
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76 (set-buffer nntp-server-buffer)
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77 (erase-buffer)
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78 (insert-file-contents nov)
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79 (goto-char (point-min))
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80 (while (and (not (eobp)) (< first (read (current-buffer))))
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81 (forward-line 1))
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82 (beginning-of-line)
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83 (if (not (eobp)) (delete-region 1 (point)))
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84 (while (and (not (eobp)) (>= last (read (current-buffer))))
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85 (forward-line 1))
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86 (beginning-of-line)
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87 (if (not (eobp)) (delete-region (point) (point-max)))
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88 'nov))))))
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89
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90 (deffoo nnkiboze-open-server (newsgroups &optional something)
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91 (gnus-make-directory nnkiboze-directory)
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92 (nnheader-init-server-buffer))
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93
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94 (deffoo nnkiboze-server-opened (&optional server)
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95 (and nntp-server-buffer
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96 (get-buffer nntp-server-buffer)))
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97
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98 (deffoo nnkiboze-request-article (article &optional newsgroup server buffer)
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99 (nnkiboze-possibly-change-newsgroups newsgroup)
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100 (if (not (numberp article))
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101 ;; This is a real kludge. It might not work at times, but it
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102 ;; does no harm I think. The only alternative is to offer no
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103 ;; article fetching by message-id at all.
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104 (nntp-request-article article newsgroup gnus-nntp-server buffer)
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105 (let* ((header (gnus-summary-article-header article))
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106 (xref (mail-header-xref header))
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107 igroup iarticle)
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108 (or xref (error "nnkiboze: No xref"))
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109 (or (string-match " \\([^ ]+\\):\\([0-9]+\\)" xref)
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110 (error "nnkiboze: Malformed xref"))
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111 (setq igroup (substring xref (match-beginning 1) (match-end 1)))
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112 (setq iarticle (string-to-int
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113 (substring xref (match-beginning 2) (match-end 2))))
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114 (and (gnus-request-group igroup t)
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115 (gnus-request-article iarticle igroup buffer)))))
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116
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117 (deffoo nnkiboze-request-group (group &optional server dont-check)
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118 "Make GROUP the current newsgroup."
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119 (nnkiboze-possibly-change-newsgroups group)
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120 (if dont-check
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121 ()
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122 (let ((nov-file (nnkiboze-nov-file-name))
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123 beg end total)
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124 (save-excursion
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125 (set-buffer nntp-server-buffer)
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126 (erase-buffer)
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127 (if (not (file-exists-p nov-file))
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128 (insert (format "211 0 0 0 %s\n" group))
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129 (insert-file-contents nov-file)
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130 (if (zerop (buffer-size))
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131 (insert (format "211 0 0 0 %s\n" group))
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132 (goto-char (point-min))
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133 (and (looking-at "[0-9]+") (setq beg (read (current-buffer))))
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134 (goto-char (point-max))
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135 (and (re-search-backward "^[0-9]" nil t)
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136 (setq end (read (current-buffer))))
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137 (setq total (count-lines (point-min) (point-max)))
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138 (erase-buffer)
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139 (insert (format "211 %d %d %d %s\n" total beg end group)))))))
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140 t)
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141
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142 (deffoo nnkiboze-close-group (group &optional server)
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143 (nnkiboze-possibly-change-newsgroups group)
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144 ;; Remove NOV lines of articles that are marked as read.
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145 (when (and (file-exists-p (nnkiboze-nov-file-name))
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146 nnkiboze-remove-read-articles
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147 (eq major-mode 'gnus-summary-mode))
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148 (save-excursion
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149 (let ((unreads gnus-newsgroup-unreads)
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150 (unselected gnus-newsgroup-unselected)
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151 (version-control 'never))
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152 (set-buffer (get-buffer-create "*nnkiboze work*"))
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153 (buffer-disable-undo (current-buffer))
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154 (erase-buffer)
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155 (let ((cur (current-buffer))
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156 article)
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157 (insert-file-contents (nnkiboze-nov-file-name))
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158 (goto-char (point-min))
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159 (while (looking-at "[0-9]+")
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160 (if (or (memq (setq article (read cur)) unreads)
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161 (memq article unselected))
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162 (forward-line 1)
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163 (delete-region (progn (beginning-of-line) (point))
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164 (progn (forward-line 1) (point)))))
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165 (write-file (nnkiboze-nov-file-name))
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166 (kill-buffer (current-buffer)))))
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167 (setq nnkiboze-current-group nil)))
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168
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169 (deffoo nnkiboze-request-list (&optional server)
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170 (nnheader-report 'nnkiboze "LIST is not implemented."))
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171
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172 (deffoo nnkiboze-request-newgroups (date &optional server)
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173 "List new groups."
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174 (nnheader-report 'nnkiboze "NEWGROUPS is not supported."))
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175
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176 (deffoo nnkiboze-request-list-newsgroups (&optional server)
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177 (nnheader-report 'nnkiboze "LIST NEWSGROUPS is not implemented."))
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178
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179 (deffoo nnkiboze-request-delete-group (group &optional force server)
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180 (nnkiboze-possibly-change-newsgroups group)
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181 (when force
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182 (let ((files (list (nnkiboze-nov-file-name)
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183 (concat nnkiboze-directory group ".newsrc")
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184 (nnkiboze-score-file group))))
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185 (while files
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186 (and (file-exists-p (car files))
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187 (file-writable-p (car files))
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188 (delete-file (car files)))
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189 (setq files (cdr files)))))
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190 (setq nnkiboze-current-group nil))
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191
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192
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193 ;;; Internal functions.
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194
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195 (defun nnkiboze-possibly-change-newsgroups (group)
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196 (setq nnkiboze-current-group group))
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197
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198 (defun nnkiboze-prefixed-name (group)
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199 (gnus-group-prefixed-name group '(nnkiboze "")))
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200
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201 ;;;###autoload
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202 (defun nnkiboze-generate-groups ()
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203 "Usage: emacs -batch -l nnkiboze -f nnkiboze-generate-groups
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204 Finds out what articles are to be part of the nnkiboze groups."
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205 (interactive)
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206 (let ((nnmail-spool-file nil)
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207 (gnus-use-dribble-file nil)
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208 (gnus-read-active-file t)
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209 (gnus-expert-user t))
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210 (gnus))
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211 (let* ((gnus-newsrc-alist (gnus-copy-sequence gnus-newsrc-alist))
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212 (newsrc gnus-newsrc-alist)
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213 gnus-newsrc-hashtb)
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214 (gnus-make-hashtable-from-newsrc-alist)
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215 ;; We have copied all the newsrc alist info over to local copies
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216 ;; so that we can mess all we want with these lists.
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217 (while newsrc
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218 (if (string-match "nnkiboze" (caar newsrc))
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219 ;; For each kiboze group, we call this function to generate
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220 ;; it.
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221 (nnkiboze-generate-group (caar newsrc)))
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222 (setq newsrc (cdr newsrc)))))
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223
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224 (defun nnkiboze-score-file (group)
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225 (list (expand-file-name
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226 (concat (file-name-as-directory gnus-kill-files-directory)
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227 (nnheader-translate-file-chars
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228 (concat nnkiboze-current-score-group
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229 "." gnus-score-file-suffix))))))
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230
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231 (defun nnkiboze-generate-group (group)
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232 (let* ((info (nth 2 (gnus-gethash group gnus-newsrc-hashtb)))
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233 (newsrc-file (concat nnkiboze-directory group ".newsrc"))
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234 (nov-file (concat nnkiboze-directory group ".nov"))
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235 (regexp (nth 1 (nth 4 info)))
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236 (gnus-expert-user t)
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237 (gnus-large-newsgroup nil)
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238 (version-control 'never)
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239 (gnus-score-find-score-files-function 'nnkiboze-score-file)
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240 gnus-select-group-hook gnus-summary-prepare-hook
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241 gnus-thread-sort-functions gnus-show-threads
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242 gnus-visual
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243 method nnkiboze-newsrc nov-buffer gname newsrc active
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244 ginfo lowest glevel)
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245 (setq nnkiboze-current-score-group group)
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246 (or info (error "No such group: %s" group))
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247 ;; Load the kiboze newsrc file for this group.
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248 (and (file-exists-p newsrc-file) (load newsrc-file))
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249 ;; We also load the nov file for this group.
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250 (save-excursion
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251 (set-buffer (setq nov-buffer (find-file-noselect nov-file)))
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252 (buffer-disable-undo (current-buffer)))
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253 ;; Go through the active hashtb and add new all groups that match the
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254 ;; kiboze regexp.
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255 (mapatoms
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256 (lambda (group)
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257 (and (string-match regexp (setq gname (symbol-name group))) ; Match
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258 (not (assoc gname nnkiboze-newsrc)) ; It isn't registered
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259 (numberp (car (symbol-value group))) ; It is active
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260 (or (> nnkiboze-level 7)
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261 (and (setq glevel (nth 1 (nth 2 (gnus-gethash
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262 gname gnus-newsrc-hashtb))))
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263 (>= nnkiboze-level glevel)))
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264 (not (string-match "^nnkiboze:" gname)) ; Exclude kibozes
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265 (setq nnkiboze-newsrc
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266 (cons (cons gname (1- (car (symbol-value group))))
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267 nnkiboze-newsrc))))
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268 gnus-active-hashtb)
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269 ;; `newsrc' is set to the list of groups that possibly are
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270 ;; component groups to this kiboze group. This list has elements
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271 ;; on the form `(GROUP . NUMBER)', where NUMBER is the highest
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272 ;; number that has been kibozed in GROUP in this kiboze group.
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273 (setq newsrc nnkiboze-newsrc)
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274 (while newsrc
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275 (if (not (setq active (gnus-gethash
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276 (caar newsrc) gnus-active-hashtb)))
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277 ;; This group isn't active after all, so we remove it from
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278 ;; the list of component groups.
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279 (setq nnkiboze-newsrc (delq (car newsrc) nnkiboze-newsrc))
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280 (setq lowest (cdar newsrc))
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281 ;; Ok, we have a valid component group, so we jump to it.
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282 (switch-to-buffer gnus-group-buffer)
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283 (gnus-group-jump-to-group (caar newsrc))
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284 ;; We set all list of article marks to nil. Since we operate
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285 ;; on copies of the real lists, we can destroy anything we
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286 ;; want here.
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287 (and (setq ginfo (nth 2 (gnus-gethash (gnus-group-group-name)
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288 gnus-newsrc-hashtb)))
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289 (nth 3 ginfo)
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290 (setcar (nthcdr 3 ginfo) nil))
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291 ;; We set the list of read articles to be what we expect for
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292 ;; this kiboze group -- either nil or `(1 . LOWEST)'.
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293 (and ginfo (setcar (nthcdr 2 ginfo)
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294 (and (not (= lowest 1)) (cons 1 lowest))))
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295 (if (not (and (or (not ginfo)
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296 (> (length (gnus-list-of-unread-articles
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297 (car ginfo))) 0))
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298 (progn
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299 (gnus-group-select-group nil)
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300 (eq major-mode 'gnus-summary-mode))))
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301 () ; No unread articles, or we couldn't enter this group.
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302 ;; We are now in the group where we want to be.
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303 (setq method (gnus-find-method-for-group gnus-newsgroup-name))
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304 (and (eq method gnus-select-method) (setq method nil))
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305 ;; We go through the list of scored articles.
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306 (while gnus-newsgroup-scored
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307 (if (> (caar gnus-newsgroup-scored) lowest)
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308 ;; If it has a good score, then we enter this article
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309 ;; into the kiboze group.
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310 (nnkiboze-enter-nov
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311 nov-buffer
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312 (gnus-summary-article-header
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313 (caar gnus-newsgroup-scored))
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314 (if method
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315 (gnus-group-prefixed-name gnus-newsgroup-name method)
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316 gnus-newsgroup-name)))
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317 (setq gnus-newsgroup-scored (cdr gnus-newsgroup-scored)))
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318 ;; That's it. We exit this group.
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319 (gnus-summary-exit-no-update)))
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320 (setcdr (car newsrc) (car active))
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321 (setq newsrc (cdr newsrc)))
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322 ;; We save the nov file.
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323 (set-buffer nov-buffer)
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324 (save-buffer)
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325 (kill-buffer (current-buffer))
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326 ;; We save the kiboze newsrc for this group.
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327 (set-buffer (get-buffer-create "*nnkiboze work*"))
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328 (buffer-disable-undo (current-buffer))
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329 (erase-buffer)
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330 (insert "(setq nnkiboze-newsrc '" (prin1-to-string nnkiboze-newsrc)
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331 ")\n")
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332 (write-file newsrc-file)
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333 (kill-buffer (current-buffer))
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334 (switch-to-buffer gnus-group-buffer)
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335 (gnus-group-list-groups 5 nil)))
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336
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337 (defun nnkiboze-enter-nov (buffer header group)
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338 (save-excursion
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339 (set-buffer buffer)
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340 (goto-char (point-max))
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341 (let ((xref (mail-header-xref header))
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342 (prefix (gnus-group-real-prefix group))
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343 (first t)
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344 article)
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345 (if (zerop (forward-line -1))
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346 (progn
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347 (setq article (1+ (read (current-buffer))))
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348 (forward-line 1))
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349 (setq article 1))
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350 (insert (int-to-string article) "\t"
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351 (or (mail-header-subject header) "") "\t"
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352 (or (mail-header-from header) "") "\t"
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353 (or (mail-header-date header) "") "\t"
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354 (or (mail-header-id header) "") "\t"
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355 (or (mail-header-references header) "") "\t"
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356 (int-to-string (or (mail-header-chars header) 0)) "\t"
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357 (int-to-string (or (mail-header-lines header) 0)) "\t")
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358 (if (or (not xref) (equal "" xref))
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359 (insert "Xref: " (system-name) " " group ":"
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360 (int-to-string (mail-header-number header))
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361 "\t\n")
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362 (insert (mail-header-xref header) "\t\n")
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363 (search-backward "\t" nil t)
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364 (search-backward "\t" nil t)
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365 (while (re-search-forward
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366 "[^ ]+:[0-9]+"
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367 (save-excursion (end-of-line) (point)) t)
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368 (if first
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369 ;; The first xref has to be the group this article
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370 ;; really came for - this is the article nnkiboze
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371 ;; will request when it is asked for the article.
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372 (save-excursion
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373 (goto-char (match-beginning 0))
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374 (insert prefix group ":"
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375 (int-to-string (mail-header-number header)) " ")
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376 (setq first nil)))
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377 (save-excursion
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378 (goto-char (match-beginning 0))
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379 (insert prefix)))))))
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380
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381 (defun nnkiboze-nov-file-name ()
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382 (concat (file-name-as-directory nnkiboze-directory)
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383 (nnheader-translate-file-chars
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384 (concat (nnkiboze-prefixed-name nnkiboze-current-group) ".nov"))))
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385
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386 (provide 'nnkiboze)
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387
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388 ;;; nnkiboze.el ends here
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