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1 ;;; nndoc.el --- single file 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 ;; Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
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6 ;; Keywords: news
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7
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8 ;; This file is part of GNU Emacs.
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9
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10 ;; GNU Emacs is free software; you can redistribute it and/or modify
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11 ;; it under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; GNU Emacs is distributed in the hope that it will be useful,
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16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ;; GNU General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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23 ;; Boston, MA 02111-1307, USA.
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24
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25 ;;; Commentary:
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26
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27 ;;; Code:
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28
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29 (require 'nnheader)
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30 (require 'message)
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31 (require 'nnmail)
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32 (require 'nnoo)
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33 (eval-when-compile (require 'cl))
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34
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35 (nnoo-declare nndoc)
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36
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37 (defvoo nndoc-article-type 'guess
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38 "*Type of the file.
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39 One of `mbox', `babyl', `digest', `news', `rnews', `mmdf', `forward',
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40 `mime-digest', `standard-digest', `slack-digest', `clari-briefs' or
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41 `guess'.")
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42
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43 (defvoo nndoc-post-type 'mail
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44 "*Whether the nndoc group is `mail' or `post'.")
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45
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46 (defvar nndoc-type-alist
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47 `((mmdf
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48 (article-begin . "^\^A\^A\^A\^A\n")
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49 (body-end . "^\^A\^A\^A\^A\n"))
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50 (news
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51 (article-begin . "^Path:"))
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52 (rnews
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53 (article-begin . "^#! *rnews +\\([0-9]+\\) *\n")
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54 (body-end-function . nndoc-rnews-body-end))
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55 (mbox
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56 (article-begin .
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57 ,(let ((delim (concat "^" message-unix-mail-delimiter)))
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58 (if (string-match "\n\\'" delim)
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59 (substring delim 0 (match-beginning 0))
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60 delim)))
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61 (body-end-function . nndoc-mbox-body-end))
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62 (babyl
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63 (article-begin . "\^_\^L *\n")
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64 (body-end . "\^_")
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65 (body-begin-function . nndoc-babyl-body-begin)
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66 (head-begin-function . nndoc-babyl-head-begin))
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67 (forward
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68 (article-begin . "^-+ Start of forwarded message -+\n+")
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69 (body-end . "^-+ End of forwarded message -+$")
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70 (prepare-body . nndoc-unquote-dashes))
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71 (clari-briefs
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72 (article-begin . "^ \\*")
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73 (body-end . "^\t------*[ \t]^*\n^ \\*")
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74 (body-begin . "^\t")
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75 (head-end . "^\t")
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76 (generate-head . nndoc-generate-clari-briefs-head)
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77 (article-transform . nndoc-transform-clari-briefs))
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78 (slack-digest
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79 (article-begin . "^------------------------------*[\n \t]+")
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80 (head-end . "^ ?$")
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81 (body-end-function . nndoc-digest-body-end)
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82 (body-begin . "^ ?$")
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83 (file-end . "^End of")
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84 (prepare-body . nndoc-unquote-dashes))
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85 (mime-digest
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86 (article-begin . "")
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87 (head-end . "^ ?$")
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88 (body-end . "")
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89 (file-end . ""))
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90 (standard-digest
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91 (first-article . ,(concat "^" (make-string 70 ?-) "\n\n+"))
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92 (article-begin . ,(concat "\n\n" (make-string 30 ?-) "\n\n+"))
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93 (prepare-body . nndoc-unquote-dashes)
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94 (body-end-function . nndoc-digest-body-end)
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95 (head-end . "^ ?$")
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96 (body-begin . "^ ?\n")
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97 (file-end . "^End of .*digest.*[0-9].*\n\\*\\*\\|^End of.*Digest *$"))
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98 (guess
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99 (guess . nndoc-guess-type))
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100 (digest
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101 (guess . nndoc-guess-digest-type))
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102 ))
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103
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104
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105
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106 (defvoo nndoc-file-begin nil)
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107 (defvoo nndoc-first-article nil)
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108 (defvoo nndoc-article-end nil)
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109 (defvoo nndoc-article-begin nil)
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110 (defvoo nndoc-head-begin nil)
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111 (defvoo nndoc-head-end nil)
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112 (defvoo nndoc-file-end nil)
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113 (defvoo nndoc-body-begin nil)
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114 (defvoo nndoc-body-end-function nil)
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115 (defvoo nndoc-body-begin-function nil)
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116 (defvoo nndoc-head-begin-function nil)
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117 (defvoo nndoc-body-end nil)
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118 (defvoo nndoc-dissection-alist nil)
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119 (defvoo nndoc-prepare-body nil)
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120 (defvoo nndoc-generate-head nil)
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121 (defvoo nndoc-article-transform nil)
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122
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123 (defvoo nndoc-status-string "")
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124 (defvoo nndoc-group-alist nil)
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125 (defvoo nndoc-current-buffer nil
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126 "Current nndoc news buffer.")
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127 (defvoo nndoc-address nil)
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128
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129 (defconst nndoc-version "nndoc 1.0"
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130 "nndoc version.")
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131
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132
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133
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134 ;;; Interface functions
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135
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136 (nnoo-define-basics nndoc)
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137
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138 (deffoo nndoc-retrieve-headers (articles &optional newsgroup server fetch-old)
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139 (when (nndoc-possibly-change-buffer newsgroup server)
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140 (save-excursion
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141 (set-buffer nntp-server-buffer)
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142 (erase-buffer)
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143 (let (article entry)
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144 (if (stringp (car articles))
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145 'headers
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146 (while articles
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147 (when (setq entry (cdr (assq (setq article (pop articles))
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148 nndoc-dissection-alist)))
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149 (insert (format "221 %d Article retrieved.\n" article))
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150 (if nndoc-generate-head
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151 (funcall nndoc-generate-head article)
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152 (insert-buffer-substring
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153 nndoc-current-buffer (car entry) (nth 1 entry)))
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154 (goto-char (point-max))
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155 (or (= (char-after (1- (point))) ?\n) (insert "\n"))
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156 (insert (format "Lines: %d\n" (nth 4 entry)))
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157 (insert ".\n")))
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158
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159 (nnheader-fold-continuation-lines)
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160 'headers)))))
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161
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162 (deffoo nndoc-request-article (article &optional newsgroup server buffer)
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163 (nndoc-possibly-change-buffer newsgroup server)
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164 (save-excursion
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165 (let ((buffer (or buffer nntp-server-buffer))
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166 (entry (cdr (assq article nndoc-dissection-alist)))
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167 beg)
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168 (set-buffer buffer)
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169 (erase-buffer)
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170 (if (stringp article)
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171 nil
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172 (insert-buffer-substring
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173 nndoc-current-buffer (car entry) (nth 1 entry))
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174 (insert "\n")
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175 (setq beg (point))
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176 (insert-buffer-substring
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177 nndoc-current-buffer (nth 2 entry) (nth 3 entry))
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178 (goto-char beg)
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179 (when nndoc-prepare-body
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180 (funcall nndoc-prepare-body))
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181 (when nndoc-article-transform
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182 (funcall nndoc-article-transform article))
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183 t))))
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184
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185 (deffoo nndoc-request-group (group &optional server dont-check)
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186 "Select news GROUP."
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187 (let (number)
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188 (cond
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189 ((not (nndoc-possibly-change-buffer group server))
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190 (nnheader-report 'nndoc "No such file or buffer: %s"
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191 nndoc-address))
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192 (dont-check
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193 (nnheader-report 'nndoc "Selected group %s" group)
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194 t)
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195 ((zerop (setq number (length nndoc-dissection-alist)))
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196 (nndoc-close-group group)
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197 (nnheader-report 'nndoc "No articles in group %s" group))
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198 (t
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199 (nnheader-insert "211 %d %d %d %s\n" number 1 number group)))))
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200
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201 (deffoo nndoc-request-type (group &optional article)
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202 (cond ((not article) 'unknown)
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203 (nndoc-post-type nndoc-post-type)
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204 (t 'unknown)))
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205
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206 (deffoo nndoc-close-group (group &optional server)
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207 (nndoc-possibly-change-buffer group server)
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208 (and nndoc-current-buffer
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209 (buffer-name nndoc-current-buffer)
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210 (kill-buffer nndoc-current-buffer))
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211 (setq nndoc-group-alist (delq (assoc group nndoc-group-alist)
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212 nndoc-group-alist))
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213 (setq nndoc-current-buffer nil)
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214 (nnoo-close-server 'nndoc server)
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215 (setq nndoc-dissection-alist nil)
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216 t)
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217
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218 (deffoo nndoc-request-list (&optional server)
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219 nil)
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220
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221 (deffoo nndoc-request-newgroups (date &optional server)
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222 nil)
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223
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224 (deffoo nndoc-request-list-newsgroups (&optional server)
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225 nil)
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226
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227
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228 ;;; Internal functions.
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229
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230 (defun nndoc-possibly-change-buffer (group source)
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231 (let (buf)
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232 (cond
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233 ;; The current buffer is this group's buffer.
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234 ((and nndoc-current-buffer
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235 (buffer-name nndoc-current-buffer)
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236 (eq nndoc-current-buffer
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237 (setq buf (cdr (assoc group nndoc-group-alist))))))
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238 ;; We change buffers by taking an old from the group alist.
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239 ;; `source' is either a string (a file name) or a buffer object.
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240 (buf
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241 (setq nndoc-current-buffer buf))
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242 ;; It's a totally new group.
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243 ((or (and (bufferp nndoc-address)
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244 (buffer-name nndoc-address))
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245 (and (stringp nndoc-address)
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246 (file-exists-p nndoc-address)
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247 (not (file-directory-p nndoc-address))))
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248 (push (cons group (setq nndoc-current-buffer
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249 (get-buffer-create
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250 (concat " *nndoc " group "*"))))
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251 nndoc-group-alist)
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252 (setq nndoc-dissection-alist nil)
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253 (save-excursion
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254 (set-buffer nndoc-current-buffer)
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255 (buffer-disable-undo (current-buffer))
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256 (erase-buffer)
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257 (if (stringp nndoc-address)
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258 (insert-file-contents nndoc-address)
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259 (insert-buffer-substring nndoc-address)))))
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260 ;; Initialize the nndoc structures according to this new document.
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261 (when (and nndoc-current-buffer
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262 (not nndoc-dissection-alist))
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263 (save-excursion
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264 (set-buffer nndoc-current-buffer)
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265 (nndoc-set-delims)
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266 (nndoc-dissect-buffer)))
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267 (unless nndoc-current-buffer
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268 (nndoc-close-server))
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269 ;; Return whether we managed to select a file.
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270 nndoc-current-buffer))
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271
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272 ;; MIME (RFC 1341) digest hack by Ulrik Dickow <dickow@nbi.dk>.
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273 (defun nndoc-guess-digest-type ()
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274 "Guess what digest type the current document is."
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275 (let ((case-fold-search t) ; We match a bit too much, keep it simple.
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276 boundary-id b-delimiter entry)
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277 (goto-char (point-min))
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278 (cond
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279 ;; MIME digest.
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280 ((and
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281 (re-search-forward
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282 (concat "^Content-Type: *multipart/digest;[ \t\n]*[ \t]"
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283 "boundary=\"\\([^\"\n]*[^\" \t\n]\\)\"")
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284 nil t)
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285 (match-beginning 1))
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286 (setq boundary-id (match-string 1)
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287 b-delimiter (concat "\n--" boundary-id "[\n \t]+"))
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288 (setq entry (assq 'mime-digest nndoc-type-alist))
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289 (setcdr entry
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290 (list
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291 (cons 'head-end "^ ?$")
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292 (cons 'body-begin "^ ?\n")
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293 (cons 'article-begin b-delimiter)
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294 (cons 'body-end-function 'nndoc-digest-body-end)
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295 ; (cons 'body-end
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296 ; (concat "\n--" boundary-id "\\(--\\)?[\n \t]+"))
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297 (cons 'file-end (concat "\n--" boundary-id "--[ \t]*$"))))
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298 'mime-digest)
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299 ;; Standard digest.
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300 ((and (re-search-forward (concat "^" (make-string 70 ?-) "\n\n") nil t)
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301 (re-search-forward
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302 (concat "\n\n" (make-string 30 ?-) "\n\n") nil t))
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303 'standard-digest)
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304 ;; Stupid digest.
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305 (t
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306 'slack-digest))))
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307
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308 (defun nndoc-guess-type ()
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309 "Guess what document type is in the current buffer."
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310 (goto-char (point-min))
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311 (cond
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312 ((looking-at message-unix-mail-delimiter)
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313 'mbox)
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314 ((looking-at "\^A\^A\^A\^A$")
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315 'mmdf)
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316 ((looking-at "^Path:.*\n")
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317 'news)
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318 ((looking-at "#! *rnews")
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319 'rnews)
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320 ((re-search-forward "\^_\^L *\n" nil t)
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321 'babyl)
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322 ((save-excursion
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323 (and (re-search-forward "^-+ Start of forwarded message -+\n+" nil t)
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324 (not (re-search-forward "^Subject:.*digest" nil t))))
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325 'forward)
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326 ((let ((case-fold-search nil))
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327 (re-search-forward "^\t[^a-z]+ ([^a-z]+) --" nil t))
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328 'clari-briefs)
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329 (t
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330 'digest)))
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331
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332 (defun nndoc-set-delims ()
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333 "Set the nndoc delimiter variables according to the type of the document."
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334 (let ((vars '(nndoc-file-begin
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335 nndoc-first-article
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336 nndoc-article-end nndoc-head-begin nndoc-head-end
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337 nndoc-file-end nndoc-article-begin
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338 nndoc-body-begin nndoc-body-end-function nndoc-body-end
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339 nndoc-prepare-body nndoc-article-transform
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340 nndoc-generate-head nndoc-body-begin-function
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341 nndoc-head-begin-function)))
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342 (while vars
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343 (set (pop vars) nil)))
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344 (let* (defs guess)
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345 ;; Guess away until we find the real file type.
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346 (while (setq defs (cdr (assq nndoc-article-type nndoc-type-alist))
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347 guess (assq 'guess defs))
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348 (setq nndoc-article-type (funcall (cdr guess))))
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349 ;; Set the nndoc variables.
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350 (while defs
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351 (set (intern (format "nndoc-%s" (caar defs)))
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352 (cdr (pop defs))))))
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353
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354 (defun nndoc-search (regexp)
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355 (prog1
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356 (re-search-forward regexp nil t)
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357 (beginning-of-line)))
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358
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359 (defun nndoc-dissect-buffer ()
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360 "Go through the document and partition it into heads/bodies/articles."
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361 (let ((i 0)
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362 (first t)
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363 head-begin head-end body-begin body-end)
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364 (setq nndoc-dissection-alist nil)
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365 (save-excursion
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366 (set-buffer nndoc-current-buffer)
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367 (goto-char (point-min))
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368 ;; Find the beginning of the file.
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369 (when nndoc-file-begin
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370 (nndoc-search nndoc-file-begin))
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371 ;; Go through the file.
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372 (while (if (and first nndoc-first-article)
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373 (nndoc-search nndoc-first-article)
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374 (nndoc-search nndoc-article-begin))
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375 (setq first nil)
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376 (cond (nndoc-head-begin-function
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377 (funcall nndoc-head-begin-function))
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378 (nndoc-head-begin
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379 (nndoc-search nndoc-head-begin)))
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380 (if (and nndoc-file-end
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381 (looking-at nndoc-file-end))
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382 (goto-char (point-max))
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383 (setq head-begin (point))
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384 (nndoc-search (or nndoc-head-end "^$"))
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385 (setq head-end (point))
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386 (if nndoc-body-begin-function
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387 (funcall nndoc-body-begin-function)
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388 (nndoc-search (or nndoc-body-begin "^\n")))
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389 (setq body-begin (point))
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390 (or (and nndoc-body-end-function
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391 (funcall nndoc-body-end-function))
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392 (and nndoc-body-end
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393 (nndoc-search nndoc-body-end))
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394 (nndoc-search nndoc-article-begin)
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395 (progn
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396 (goto-char (point-max))
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397 (when nndoc-file-end
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398 (and (re-search-backward nndoc-file-end nil t)
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399 (beginning-of-line)))))
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400 (setq body-end (point))
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401 (push (list (incf i) head-begin head-end body-begin body-end
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402 (count-lines body-begin body-end))
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403 nndoc-dissection-alist))))))
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404
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405 (defun nndoc-unquote-dashes ()
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406 "Unquote quoted non-separators in digests."
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407 (while (re-search-forward "^- -"nil t)
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408 (replace-match "-" t t)))
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409
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410 (defun nndoc-digest-body-end ()
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411 (and (re-search-forward nndoc-article-begin nil t)
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412 (goto-char (match-beginning 0))))
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413
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414 (defun nndoc-mbox-body-end ()
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415 (let ((beg (point))
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416 len end)
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417 (when
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418 (save-excursion
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419 (and (re-search-backward nndoc-article-begin nil t)
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420 (setq end (point))
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421 (search-forward "\n\n" beg t)
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422 (re-search-backward
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423 "^Content-Length:[ \t]*\\([0-9]+\\) *$" end t)
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424 (setq len (string-to-int (match-string 1)))
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425 (search-forward "\n\n" beg t)
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426 (or (= (setq len (+ (point) len)) (point-max))
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427 (and (< len (point-max))
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428 (goto-char len)
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429 (looking-at nndoc-article-begin)))))
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430 (goto-char len))))
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431
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432 (defun nndoc-rnews-body-end ()
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433 (and (re-search-backward nndoc-article-begin nil t)
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434 (forward-line 1)
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435 (goto-char (+ (point) (string-to-int (match-string 1))))))
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436
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437 (defun nndoc-transform-clari-briefs (article)
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438 (goto-char (point-min))
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439 (when (looking-at " *\\*\\(.*\\)\n")
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440 (replace-match "" t t))
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441 (nndoc-generate-clari-briefs-head article))
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442
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443 (defun nndoc-generate-clari-briefs-head (article)
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444 (let ((entry (cdr (assq article nndoc-dissection-alist)))
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445 subject from)
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446 (save-excursion
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447 (set-buffer nndoc-current-buffer)
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448 (save-restriction
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449 (narrow-to-region (car entry) (nth 3 entry))
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450 (goto-char (point-min))
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451 (when (looking-at " *\\*\\(.*\\)$")
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452 (setq subject (match-string 1))
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453 (when (string-match "[ \t]+$" subject)
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454 (setq subject (substring subject 0 (match-beginning 0)))))
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455 (when
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456 (let ((case-fold-search nil))
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457 (re-search-forward
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458 "^\t\\([^a-z]+\\(,[^(]+\\)? ([^a-z]+)\\) --" nil t))
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459 (setq from (match-string 1)))))
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460 (insert "From: " "clari@clari.net (" (or from "unknown") ")"
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461 "\nSubject: " (or subject "(no subject)") "\n")))
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462
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463 (defun nndoc-babyl-body-begin ()
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464 (re-search-forward "^\n" nil t)
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465 (when (looking-at "\*\*\* EOOH \*\*\*")
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466 (re-search-forward "^\n" nil t)))
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467
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468 (defun nndoc-babyl-head-begin ()
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469 (when (re-search-forward "^[0-9].*\n" nil t)
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470 (when (looking-at "\*\*\* EOOH \*\*\*")
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471 (forward-line 1))
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472 t))
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473
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474 (provide 'nndoc)
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475
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476 ;;; nndoc.el ends here
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