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1 ;;; nnkiboze.el --- select virtual news access for Gnus
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2 ;; Copyright (C) 1995,96,97 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't 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 (nnheader-concat gnus-directory "kiboze/")
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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 (defvoo nnkiboze-ephemeral nil
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50 "If non-nil, don't store any data anywhere.")
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51
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52 (defvoo nnkiboze-scores nil
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53 "Score rules for generating the nnkiboze group.")
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54
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55 (defvoo nnkiboze-regexp nil
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56 "Regexp for matching component groups.")
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57
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58
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59
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60 (defconst nnkiboze-version "nnkiboze 1.0")
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61
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62 (defvoo nnkiboze-current-group nil)
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63 (defvoo nnkiboze-status-string "")
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64
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65 (defvoo nnkiboze-headers nil)
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66
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67
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68
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69 ;;; Interface functions.
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70
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71 (nnoo-define-basics nnkiboze)
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72
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73 (deffoo nnkiboze-retrieve-headers (articles &optional group server fetch-old)
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74 (nnkiboze-possibly-change-group group)
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75 (unless gnus-nov-is-evil
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76 (if (stringp (car articles))
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77 'headers
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78 (let ((nov (nnkiboze-nov-file-name)))
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79 (when (file-exists-p nov)
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80 (save-excursion
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81 (set-buffer nntp-server-buffer)
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82 (erase-buffer)
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83 (nnheader-insert-file-contents nov)
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84 (nnheader-nov-delete-outside-range
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85 (car articles) (car (last articles)))
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86 'nov))))))
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87
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88 (deffoo nnkiboze-request-article (article &optional newsgroup server buffer)
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89 (nnkiboze-possibly-change-group newsgroup)
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90 (if (not (numberp article))
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91 ;; This is a real kludge. It might not work at times, but it
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92 ;; does no harm I think. The only alternative is to offer no
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93 ;; article fetching by message-id at all.
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94 (nntp-request-article article newsgroup gnus-nntp-server buffer)
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95 (let* ((header (gnus-summary-article-header article))
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96 (xref (mail-header-xref header)))
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97 (unless xref
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98 (error "nnkiboze: No xref"))
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99 (unless (string-match " \\([^ ]+\\):\\([0-9]+\\)" xref)
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100 (error "nnkiboze: Malformed xref"))
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101 (gnus-request-article (string-to-int (match-string 2 xref))
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102 (match-string 1 xref)
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103 buffer))))
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104
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105 (deffoo nnkiboze-request-scan (&optional group server)
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106 (nnkiboze-generate-group (concat "nnkiboze:" group)))
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107
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108 (deffoo nnkiboze-request-group (group &optional server dont-check)
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109 "Make GROUP the current newsgroup."
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110 (nnkiboze-possibly-change-group group)
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111 (if dont-check
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112 t
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113 (let ((nov-file (nnkiboze-nov-file-name))
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114 beg end total)
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115 (save-excursion
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116 (set-buffer nntp-server-buffer)
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117 (erase-buffer)
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118 (if (not (file-exists-p nov-file))
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119 (nnheader-report 'nnkiboze "Can't select group %s" group)
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120 (nnheader-insert-file-contents nov-file)
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121 (if (zerop (buffer-size))
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122 (nnheader-insert "211 0 0 0 %s\n" group)
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123 (goto-char (point-min))
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124 (when (looking-at "[0-9]+")
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125 (setq beg (read (current-buffer))))
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126 (goto-char (point-max))
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127 (when (re-search-backward "^[0-9]" nil t)
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128 (setq end (read (current-buffer))))
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129 (setq total (count-lines (point-min) (point-max)))
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130 (nnheader-insert "211 %d %d %d %s\n" total beg end group)))))))
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131
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132 (deffoo nnkiboze-close-group (group &optional server)
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133 (nnkiboze-possibly-change-group group)
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134 ;; Remove NOV lines of articles that are marked as read.
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135 (when (and (file-exists-p (nnkiboze-nov-file-name))
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136 nnkiboze-remove-read-articles)
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137 (nnheader-temp-write (nnkiboze-nov-file-name)
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138 (let ((cur (current-buffer)))
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139 (nnheader-insert-file-contents (nnkiboze-nov-file-name))
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140 (goto-char (point-min))
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141 (while (not (eobp))
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142 (if (not (gnus-article-read-p (read cur)))
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143 (forward-line 1)
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144 (gnus-delete-line))))))
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145 (setq nnkiboze-current-group nil))
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146
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147 (deffoo nnkiboze-open-server (server &optional defs)
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148 (unless (assq 'nnkiboze-regexp defs)
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149 (push `(nnkiboze-regexp ,server)
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150 defs))
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151 (nnoo-change-server 'nnkiboze server defs))
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152
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153 (deffoo nnkiboze-request-delete-group (group &optional force server)
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154 (nnkiboze-possibly-change-group group)
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155 (when force
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156 (let ((files (list (nnkiboze-nov-file-name)
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157 (concat nnkiboze-directory group ".newsrc")
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158 (nnkiboze-score-file group))))
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159 (while files
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160 (and (file-exists-p (car files))
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161 (file-writable-p (car files))
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162 (delete-file (car files)))
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163 (setq files (cdr files)))))
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164 (setq nnkiboze-current-group nil))
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165
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166 (nnoo-define-skeleton nnkiboze)
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167
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168
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169 ;;; Internal functions.
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170
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171 (defun nnkiboze-possibly-change-group (group)
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172 (setq nnkiboze-current-group group))
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173
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174 (defun nnkiboze-prefixed-name (group)
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175 (gnus-group-prefixed-name group '(nnkiboze "")))
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176
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177 ;;;###autoload
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178 (defun nnkiboze-generate-groups ()
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179 "Usage: emacs -batch -l nnkiboze -f nnkiboze-generate-groups
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180 Finds out what articles are to be part of the nnkiboze groups."
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181 (interactive)
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182 (let ((nnmail-spool-file nil)
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183 (gnus-use-dribble-file nil)
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184 (gnus-read-active-file t)
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185 (gnus-expert-user t))
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186 (gnus))
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187 (let* ((gnus-newsrc-alist (gnus-copy-sequence gnus-newsrc-alist))
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188 (newsrc (cdr gnus-newsrc-alist))
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189 gnus-newsrc-hashtb info)
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190 (gnus-make-hashtable-from-newsrc-alist)
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191 ;; We have copied all the newsrc alist info over to local copies
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192 ;; so that we can mess all we want with these lists.
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193 (while (setq info (pop newsrc))
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194 (when (string-match "nnkiboze" (gnus-info-group info))
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195 ;; For each kiboze group, we call this function to generate
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196 ;; it.
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197 (nnkiboze-generate-group (gnus-info-group info))))))
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198
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199 (defun nnkiboze-score-file (group)
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200 (list (expand-file-name
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201 (concat (file-name-as-directory gnus-kill-files-directory)
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202 (nnheader-translate-file-chars
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203 (concat (nnkiboze-prefixed-name nnkiboze-current-group)
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204 "." gnus-score-file-suffix))))))
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205
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206 (defun nnkiboze-generate-group (group)
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207 (let* ((info (nth 2 (gnus-gethash group gnus-newsrc-hashtb)))
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208 (newsrc-file (concat nnkiboze-directory group ".newsrc"))
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209 (nov-file (concat nnkiboze-directory group ".nov"))
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210 method nnkiboze-newsrc gname newsrc active
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211 ginfo lowest glevel orig-info nov-buffer
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212 ;; Bind various things to nil to make group entry faster.
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213 (gnus-expert-user t)
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214 (gnus-large-newsgroup nil)
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215 (gnus-score-find-score-files-function 'nnkiboze-score-file)
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216 (gnus-verbose (min gnus-verbose 3))
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217 gnus-select-group-hook gnus-summary-prepare-hook
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218 gnus-thread-sort-functions gnus-show-threads
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219 gnus-visual gnus-suppress-duplicates)
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220 (unless info
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221 (error "No such group: %s" group))
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222 ;; Load the kiboze newsrc file for this group.
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223 (when (file-exists-p newsrc-file)
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224 (load newsrc-file))
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225 (nnheader-temp-write nov-file
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226 (when (file-exists-p nov-file)
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227 (insert-file-contents nov-file))
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228 (setq nov-buffer (current-buffer))
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229 ;; Go through the active hashtb and add new all groups that match the
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230 ;; kiboze regexp.
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231 (mapatoms
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232 (lambda (group)
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233 (and (string-match nnkiboze-regexp
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234 (setq gname (symbol-name group))) ; Match
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235 (not (assoc gname nnkiboze-newsrc)) ; It isn't registered
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236 (numberp (car (symbol-value group))) ; It is active
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237 (or (> nnkiboze-level 7)
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238 (and (setq glevel (nth 1 (nth 2 (gnus-gethash
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239 gname gnus-newsrc-hashtb))))
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240 (>= nnkiboze-level glevel)))
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241 (not (string-match "^nnkiboze:" gname)) ; Exclude kibozes
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242 (push (cons gname (1- (car (symbol-value group))))
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243 nnkiboze-newsrc)))
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244 gnus-active-hashtb)
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245 ;; `newsrc' is set to the list of groups that possibly are
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246 ;; component groups to this kiboze group. This list has elements
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247 ;; on the form `(GROUP . NUMBER)', where NUMBER is the highest
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248 ;; number that has been kibozed in GROUP in this kiboze group.
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249 (setq newsrc nnkiboze-newsrc)
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250 (while newsrc
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251 (if (not (setq active (gnus-gethash
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252 (caar newsrc) gnus-active-hashtb)))
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253 ;; This group isn't active after all, so we remove it from
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254 ;; the list of component groups.
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255 (setq nnkiboze-newsrc (delq (car newsrc) nnkiboze-newsrc))
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256 (setq lowest (cdar newsrc))
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108
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257 ;; Ok, we have a valid component group, so we jump to it.
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258 (switch-to-buffer gnus-group-buffer)
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259 (gnus-group-jump-to-group (caar newsrc))
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260 (gnus-message 3 "nnkiboze: Checking %s..." (caar newsrc))
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261 (setq ginfo (gnus-get-info (gnus-group-group-name))
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262 orig-info (gnus-copy-sequence ginfo))
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263 (unwind-protect
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264 (progn
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265 ;; We set all list of article marks to nil. Since we operate
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266 ;; on copies of the real lists, we can destroy anything we
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267 ;; want here.
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268 (when (nth 3 ginfo)
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269 (setcar (nthcdr 3 ginfo) nil))
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270 ;; We set the list of read articles to be what we expect for
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271 ;; this kiboze group -- either nil or `(1 . LOWEST)'.
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272 (when ginfo
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273 (setcar (nthcdr 2 ginfo)
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274 (and (not (= lowest 1)) (cons 1 lowest))))
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275 (when (and (or (not ginfo)
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276 (> (length (gnus-list-of-unread-articles
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277 (car ginfo)))
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278 0))
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279 (progn
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280 (gnus-group-select-group nil)
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281 (eq major-mode 'gnus-summary-mode)))
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282 ;; We are now in the group where we want to be.
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283 (setq method (gnus-find-method-for-group
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284 gnus-newsgroup-name))
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285 (when (eq method gnus-select-method)
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286 (setq method nil))
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287 ;; We go through the list of scored articles.
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288 (while gnus-newsgroup-scored
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289 (when (> (caar gnus-newsgroup-scored) lowest)
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290 ;; If it has a good score, then we enter this article
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291 ;; into the kiboze group.
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108
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292 (nnkiboze-enter-nov
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293 nov-buffer
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294 (gnus-summary-article-header
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295 (caar gnus-newsgroup-scored))
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296 gnus-newsgroup-name))
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297 (setq gnus-newsgroup-scored (cdr gnus-newsgroup-scored)))
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298 ;; That's it. We exit this group.
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299 (gnus-summary-exit-no-update)))
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300 ;; Restore the proper info.
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301 (when ginfo
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302 (setcdr ginfo (cdr orig-info)))))
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303 (setcdr (car newsrc) (car active))
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304 (gnus-message 3 "nnkiboze: Checking %s...done" (caar newsrc))
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305 (setq newsrc (cdr newsrc))))
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306 ;; We save the kiboze newsrc for this group.
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307 (nnheader-temp-write newsrc-file
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308 (insert "(setq nnkiboze-newsrc '")
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309 (gnus-prin1 nnkiboze-newsrc)
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310 (insert ")\n"))
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311 t))
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312
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313 (defun nnkiboze-enter-nov (buffer header group)
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314 (save-excursion
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315 (set-buffer buffer)
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316 (goto-char (point-max))
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317 (let ((xref (mail-header-xref header))
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318 (prefix (gnus-group-real-prefix group))
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319 (oheader (copy-sequence header))
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320 (first t)
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321 article)
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322 (if (zerop (forward-line -1))
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323 (progn
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324 (setq article (1+ (read (current-buffer))))
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325 (forward-line 1))
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326 (setq article 1))
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327 (mail-header-set-number oheader article)
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328 (nnheader-insert-nov oheader)
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329 (search-backward "\t" nil t 2)
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330 (if (re-search-forward " [^ ]+:[0-9]+" nil t)
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331 (goto-char (match-beginning 0))
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332 (forward-char 1))
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333 ;; The first Xref has to be the group this article
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334 ;; really came for - this is the article nnkiboze
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335 ;; will request when it is asked for the article.
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336 (insert group ":"
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337 (int-to-string (mail-header-number header)) " ")
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338 (while (re-search-forward " [^ ]+:[0-9]+" nil t)
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339 (goto-char (1+ (match-beginning 0)))
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340 (insert prefix)))))
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341
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342 (defun nnkiboze-nov-file-name ()
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343 (concat (file-name-as-directory nnkiboze-directory)
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344 (nnheader-translate-file-chars
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345 (concat (nnkiboze-prefixed-name nnkiboze-current-group) ".nov"))))
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346
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347 (provide 'nnkiboze)
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348
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349 ;;; nnkiboze.el ends here
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