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1 ;;; nnmh.el --- mhspool 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, mail
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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 ;; Based on nnspool.el by Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>.
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28 ;; For an overview of what the interface functions do, please see the
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29 ;; Gnus sources.
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30
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31 ;;; Code:
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32
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33 (require 'nnheader)
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34 (require 'nnmail)
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35 (require 'gnus)
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36 (require 'nnoo)
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37 (eval-and-compile (require 'cl))
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38
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39 (nnoo-declare nnmh)
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40
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41 (defvoo nnmh-directory message-directory
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42 "*Mail spool directory.")
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43
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44 (defvoo nnmh-get-new-mail t
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45 "*If non-nil, nnmh will check the incoming mail file and split the mail.")
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46
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47 (defvoo nnmh-prepare-save-mail-hook nil
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48 "*Hook run narrowed to an article before saving.")
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49
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50 (defvoo nnmh-be-safe nil
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51 "*If non-nil, nnmh will check all articles to make sure whether they are new or not.")
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52
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53
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54
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55 (defconst nnmh-version "nnmh 1.0"
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56 "nnmh version.")
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57
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58 (defvoo nnmh-current-directory nil
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59 "Current news group directory.")
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60
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61 (defvoo nnmh-status-string "")
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62 (defvoo nnmh-group-alist nil)
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63
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64
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65
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66 ;;; Interface functions.
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67
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68 (nnoo-define-basics nnmh)
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69
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70 (deffoo nnmh-retrieve-headers (articles &optional newsgroup server fetch-old)
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71 (save-excursion
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72 (set-buffer nntp-server-buffer)
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73 (erase-buffer)
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74 (let* ((file nil)
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75 (number (length articles))
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76 (large (and (numberp nnmail-large-newsgroup)
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77 (> number nnmail-large-newsgroup)))
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78 (count 0)
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79 beg article)
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80 (nnmh-possibly-change-directory newsgroup server)
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81 ;; We don't support fetching by Message-ID.
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82 (if (stringp (car articles))
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83 'headers
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84 (while articles
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85 (when (and (file-exists-p
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86 (setq file (concat (file-name-as-directory
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87 nnmh-current-directory)
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88 (int-to-string
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89 (setq article (pop articles))))))
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90 (not (file-directory-p file)))
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91 (insert (format "221 %d Article retrieved.\n" article))
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92 (setq beg (point))
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93 (nnheader-insert-head file)
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94 (goto-char beg)
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95 (if (search-forward "\n\n" nil t)
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96 (forward-char -1)
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97 (goto-char (point-max))
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98 (insert "\n\n"))
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99 (insert ".\n")
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100 (delete-region (point) (point-max)))
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101 (setq count (1+ count))
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102
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103 (and large
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104 (zerop (% count 20))
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105 (message "nnmh: Receiving headers... %d%%"
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106 (/ (* count 100) number))))
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107
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108 (and large (message "nnmh: Receiving headers...done"))
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109
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110 (nnheader-fold-continuation-lines)
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111 'headers))))
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112
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113 (deffoo nnmh-open-server (server &optional defs)
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114 (nnoo-change-server 'nnmh server defs)
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115 (when (not (file-exists-p nnmh-directory))
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116 (condition-case ()
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117 (make-directory nnmh-directory t)
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118 (error t)))
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119 (cond
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120 ((not (file-exists-p nnmh-directory))
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121 (nnmh-close-server)
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122 (nnheader-report 'nnmh "Couldn't create directory: %s" nnmh-directory))
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123 ((not (file-directory-p (file-truename nnmh-directory)))
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124 (nnmh-close-server)
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125 (nnheader-report 'nnmh "Not a directory: %s" nnmh-directory))
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126 (t
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127 (nnheader-report 'nnmh "Opened server %s using directory %s"
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128 server nnmh-directory)
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129 t)))
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130
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131 (deffoo nnmh-request-article (id &optional newsgroup server buffer)
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132 (nnmh-possibly-change-directory newsgroup server)
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133 (let ((file (if (stringp id)
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134 nil
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135 (concat nnmh-current-directory (int-to-string id))))
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136 (nntp-server-buffer (or buffer nntp-server-buffer)))
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137 (and (stringp file)
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138 (file-exists-p file)
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139 (not (file-directory-p file))
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140 (save-excursion (nnmail-find-file file))
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141 (string-to-int (file-name-nondirectory file)))))
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142
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143 (deffoo nnmh-request-group (group &optional server dont-check)
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144 (let ((pathname (nnmail-group-pathname group nnmh-directory))
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145 dir)
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146 (cond
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147 ((not (file-directory-p pathname))
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148 (nnheader-report
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149 'nnmh "Can't select group (no such directory): %s" group))
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150 (t
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151 (setq nnmh-current-directory pathname)
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152 (and nnmh-get-new-mail
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153 nnmh-be-safe
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154 (nnmh-update-gnus-unreads group))
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155 (cond
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156 (dont-check
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157 (nnheader-report 'nnmh "Selected group %s" group)
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158 t)
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159 (t
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2
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160 ;; Re-scan the directory if it's on a foreign system.
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161 (nnheader-re-read-dir pathname)
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0
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162 (setq dir
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163 (sort
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164 (mapcar (lambda (name) (string-to-int name))
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165 (directory-files pathname nil "^[0-9]+$" t))
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166 '<))
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167 (cond
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168 (dir
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169 (nnheader-report 'nnmh "Selected group %s" group)
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170 (nnheader-insert
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171 "211 %d %d %d %s\n" (length dir) (car dir)
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172 (progn (while (cdr dir) (setq dir (cdr dir))) (car dir))
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173 group))
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174 (t
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175 (nnheader-report 'nnmh "Empty group %s" group)
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176 (nnheader-insert (format "211 0 1 0 %s\n" group))))))))))
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177
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178 (deffoo nnmh-request-scan (&optional group server)
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179 (nnmail-get-new-mail 'nnmh nil nnmh-directory group))
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180
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181 (deffoo nnmh-request-list (&optional server dir)
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182 (nnheader-insert "")
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183 (let ((nnmh-toplev
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184 (or dir (file-truename (file-name-as-directory nnmh-directory)))))
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185 (nnmh-request-list-1 nnmh-toplev))
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186 (setq nnmh-group-alist (nnmail-get-active))
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187 t)
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188
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189 (defvar nnmh-toplev)
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190 (defun nnmh-request-list-1 (dir)
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191 (setq dir (expand-file-name dir))
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192 ;; Recurse down all directories.
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193 (let ((dirs (and (file-readable-p dir)
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194 (> (nth 1 (file-attributes (file-chase-links dir))) 2)
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195 (directory-files dir t nil t)))
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196 dir)
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197 ;; Recurse down directories.
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198 (while (setq dir (pop dirs))
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199 (when (and (not (member (file-name-nondirectory dir) '("." "..")))
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200 (file-directory-p dir)
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201 (file-readable-p dir))
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202 (nnmh-request-list-1 dir))))
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203 ;; For each directory, generate an active file line.
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204 (unless (string= (expand-file-name nnmh-toplev) dir)
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205 (let ((files (mapcar
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206 (lambda (name) (string-to-int name))
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207 (directory-files dir nil "^[0-9]+$" t))))
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208 (when files
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209 (save-excursion
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210 (set-buffer nntp-server-buffer)
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211 (goto-char (point-max))
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212 (insert
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213 (format
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214 "%s %d %d y\n"
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215 (progn
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216 (string-match
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217 (regexp-quote
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218 (file-truename (file-name-as-directory
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219 (expand-file-name nnmh-toplev)))) dir)
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220 (nnheader-replace-chars-in-string
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221 (substring dir (match-end 0)) ?/ ?.))
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222 (apply 'max files)
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223 (apply 'min files)))))))
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224 t)
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225
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226 (deffoo nnmh-request-newgroups (date &optional server)
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227 (nnmh-request-list server))
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228
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229 (deffoo nnmh-request-expire-articles (articles newsgroup &optional server force)
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230 (nnmh-possibly-change-directory newsgroup server)
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231 (let* ((active-articles
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232 (mapcar
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233 (function
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234 (lambda (name)
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235 (string-to-int name)))
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236 (directory-files nnmh-current-directory nil "^[0-9]+$" t)))
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237 (is-old t)
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238 article rest mod-time)
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239 (nnmail-activate 'nnmh)
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240
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241 (while (and articles is-old)
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242 (setq article (concat nnmh-current-directory
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243 (int-to-string (car articles))))
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244 (if (setq mod-time (nth 5 (file-attributes article)))
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245 (if (and (nnmh-deletable-article-p newsgroup (car articles))
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246 (setq is-old
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247 (nnmail-expired-article-p newsgroup mod-time force)))
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248 (progn
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249 (nnheader-message 5 "Deleting article %s in %s..."
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250 article newsgroup)
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251 (condition-case ()
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252 (funcall nnmail-delete-file-function article)
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253 (file-error
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254 (nnheader-message 1 "Couldn't delete article %s in %s"
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255 article newsgroup)
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256 (setq rest (cons (car articles) rest)))))
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257 (setq rest (cons (car articles) rest))))
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258 (setq articles (cdr articles)))
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259 (message "")
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260 (nconc rest articles)))
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261
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262 (deffoo nnmh-close-group (group &optional server)
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263 t)
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264
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265 (deffoo nnmh-request-move-article
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266 (article group server accept-form &optional last)
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267 (let ((buf (get-buffer-create " *nnmh move*"))
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268 result)
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269 (and
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270 (nnmh-deletable-article-p group article)
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271 (nnmh-request-article article group server)
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272 (save-excursion
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273 (set-buffer buf)
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274 (insert-buffer-substring nntp-server-buffer)
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275 (setq result (eval accept-form))
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276 (kill-buffer (current-buffer))
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277 result)
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278 (progn
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279 (nnmh-possibly-change-directory group server)
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280 (condition-case ()
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281 (funcall nnmail-delete-file-function
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282 (concat nnmh-current-directory (int-to-string article)))
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283 (file-error nil))))
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284 result))
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285
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286 (deffoo nnmh-request-accept-article (group &optional server last noinsert)
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287 (nnmh-possibly-change-directory group server)
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288 (nnmail-check-syntax)
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289 (if (stringp group)
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290 (and
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291 (nnmail-activate 'nnmh)
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292 ;; We trick the choosing function into believing that only one
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293 ;; group is available.
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294 (let ((nnmail-split-methods (list (list group ""))))
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295 (car (nnmh-save-mail noinsert))))
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296 (and
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297 (nnmail-activate 'nnmh)
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298 (car (nnmh-save-mail noinsert)))))
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299
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300 (deffoo nnmh-request-replace-article (article group buffer)
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301 (nnmh-possibly-change-directory group)
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302 (save-excursion
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303 (set-buffer buffer)
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304 (nnmh-possibly-create-directory group)
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305 (condition-case ()
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306 (progn
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307 (write-region
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308 (point-min) (point-max)
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309 (concat nnmh-current-directory (int-to-string article))
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310 nil (if (nnheader-be-verbose 5) nil 'nomesg))
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311 t)
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312 (error nil))))
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313
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314 (deffoo nnmh-request-create-group (group &optional server)
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315 (nnmail-activate 'nnmh)
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316 (or (assoc group nnmh-group-alist)
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317 (let (active)
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318 (setq nnmh-group-alist (cons (list group (setq active (cons 1 0)))
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319 nnmh-group-alist))
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320 (nnmh-possibly-create-directory group)
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321 (nnmh-possibly-change-directory group server)
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322 (let ((articles (mapcar
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323 (lambda (file)
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324 (string-to-int file))
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325 (directory-files
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326 nnmh-current-directory nil "^[0-9]+$"))))
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327 (and articles
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328 (progn
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329 (setcar active (apply 'min articles))
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330 (setcdr active (apply 'max articles)))))))
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331 t)
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332
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333 (deffoo nnmh-request-delete-group (group &optional force server)
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334 (nnmh-possibly-change-directory group server)
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335 ;; Delete all articles in GROUP.
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336 (if (not force)
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337 () ; Don't delete the articles.
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338 (let ((articles (directory-files nnmh-current-directory t "^[0-9]+$")))
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339 (while articles
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340 (and (file-writable-p (car articles))
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341 (progn
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342 (nnheader-message 5 "Deleting article %s in %s..."
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343 (car articles) group)
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344 (funcall nnmail-delete-file-function (car articles))))
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345 (setq articles (cdr articles))))
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346 ;; Try to delete the directory itself.
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347 (condition-case ()
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348 (delete-directory nnmh-current-directory)
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349 (error nil)))
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350 ;; Remove the group from all structures.
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351 (setq nnmh-group-alist
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352 (delq (assoc group nnmh-group-alist) nnmh-group-alist)
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353 nnmh-current-directory nil)
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354 t)
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355
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356 (deffoo nnmh-request-rename-group (group new-name &optional server)
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357 (nnmh-possibly-change-directory group server)
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358 ;; Rename directory.
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359 (and (file-writable-p nnmh-current-directory)
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360 (condition-case ()
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361 (progn
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362 (rename-file
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363 (directory-file-name nnmh-current-directory)
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364 (directory-file-name
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365 (nnmail-group-pathname new-name nnmh-directory)))
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366 t)
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367 (error nil))
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368 ;; That went ok, so we change the internal structures.
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369 (let ((entry (assoc group nnmh-group-alist)))
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370 (and entry (setcar entry new-name))
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371 (setq nnmh-current-directory nil)
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372 t)))
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373
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374
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375 ;;; Internal functions.
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376
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377 (defun nnmh-possibly-change-directory (newsgroup &optional server)
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378 (when (and server
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379 (not (nnmh-server-opened server)))
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380 (nnmh-open-server server))
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381 (if newsgroup
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382 (let ((pathname (nnmail-group-pathname newsgroup nnmh-directory)))
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383 (if (file-directory-p pathname)
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384 (setq nnmh-current-directory pathname)
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385 (error "No such newsgroup: %s" newsgroup)))))
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386
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387 (defun nnmh-possibly-create-directory (group)
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388 (let (dir dirs)
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389 (setq dir (nnmail-group-pathname group nnmh-directory))
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390 (while (not (file-directory-p dir))
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391 (setq dirs (cons dir dirs))
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392 (setq dir (file-name-directory (directory-file-name dir))))
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393 (while dirs
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394 (if (make-directory (directory-file-name (car dirs)))
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395 (error "Could not create directory %s" (car dirs)))
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396 (nnheader-message 5 "Creating mail directory %s" (car dirs))
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397 (setq dirs (cdr dirs)))))
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398
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399 (defun nnmh-save-mail (&optional noinsert)
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400 "Called narrowed to an article."
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401 (let ((group-art (nreverse (nnmail-article-group 'nnmh-active-number))))
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402 (unless noinsert
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403 (nnmail-insert-lines)
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404 (nnmail-insert-xref group-art))
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405 (run-hooks 'nnmail-prepare-save-mail-hook)
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406 (run-hooks 'nnmh-prepare-save-mail-hook)
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407 (goto-char (point-min))
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408 (while (looking-at "From ")
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409 (replace-match "X-From-Line: ")
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410 (forward-line 1))
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411 ;; We save the article in all the newsgroups it belongs in.
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412 (let ((ga group-art)
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413 first)
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414 (while ga
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415 (nnmh-possibly-create-directory (caar ga))
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416 (let ((file (concat (nnmail-group-pathname
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417 (caar ga) nnmh-directory)
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418 (int-to-string (cdar ga)))))
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419 (if first
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420 ;; It was already saved, so we just make a hard link.
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421 (funcall nnmail-crosspost-link-function first file t)
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422 ;; Save the article.
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423 (write-region (point-min) (point-max) file nil nil)
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424 (setq first file)))
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425 (setq ga (cdr ga))))
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426 group-art))
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427
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428 (defun nnmh-active-number (group)
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429 "Compute the next article number in GROUP."
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430 (let ((active (cadr (assoc group nnmh-group-alist))))
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431 ;; The group wasn't known to nnmh, so we just create an active
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432 ;; entry for it.
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433 (or active
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434 (progn
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435 (setq active (cons 1 0))
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436 (setq nnmh-group-alist (cons (list group active) nnmh-group-alist))))
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437 (setcdr active (1+ (cdr active)))
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438 (while (file-exists-p
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439 (concat (nnmail-group-pathname group nnmh-directory)
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440 (int-to-string (cdr active))))
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441 (setcdr active (1+ (cdr active))))
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442 (cdr active)))
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443
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444 (defun nnmh-update-gnus-unreads (group)
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445 ;; Go through the .nnmh-articles file and compare with the actual
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446 ;; articles in this folder. The articles that are "new" will be
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447 ;; marked as unread by Gnus.
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448 (let* ((dir nnmh-current-directory)
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449 (files (sort (mapcar (function (lambda (name) (string-to-int name)))
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450 (directory-files nnmh-current-directory
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451 nil "^[0-9]+$" t)) '<))
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452 (nnmh-file (concat dir ".nnmh-articles"))
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453 new articles)
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454 ;; Load the .nnmh-articles file.
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455 (if (file-exists-p nnmh-file)
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456 (setq articles
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457 (let (nnmh-newsgroup-articles)
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458 (condition-case nil (load nnmh-file nil t t) (error nil))
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459 nnmh-newsgroup-articles)))
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460 ;; Add all new articles to the `new' list.
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461 (let ((art files))
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462 (while art
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463 (if (not (assq (car art) articles)) (setq new (cons (car art) new)))
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464 (setq art (cdr art))))
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465 ;; Remove all deleted articles.
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466 (let ((art articles))
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467 (while art
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468 (if (not (memq (caar art) files))
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469 (setq articles (delq (car art) articles)))
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470 (setq art (cdr art))))
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471 ;; Check whether the highest-numbered articles really are the ones
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472 ;; that Gnus thinks they are by looking at the time-stamps.
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473 (let ((art articles))
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474 (while (and art
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475 (not (equal
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476 (nth 5 (file-attributes
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477 (concat dir (int-to-string (caar art)))))
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478 (cdar art))))
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479 (setq articles (delq (car art) articles))
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480 (setq new (cons (caar art) new))
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481 (setq art (cdr art))))
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482 ;; Go through all the new articles and add them, and their
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483 ;; time-stamps to the list.
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484 (let ((n new))
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485 (while n
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486 (setq articles
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487 (cons (cons
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488 (car n)
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489 (nth 5 (file-attributes
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490 (concat dir (int-to-string (car n))))))
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491 articles))
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492 (setq n (cdr n))))
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493 ;; Make Gnus mark all new articles as unread.
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494 (or (zerop (length new))
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495 (gnus-make-articles-unread
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496 (gnus-group-prefixed-name group (list 'nnmh ""))
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497 (setq new (sort new '<))))
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498 ;; Sort the article list with highest numbers first.
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499 (setq articles (sort articles (lambda (art1 art2)
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500 (> (car art1) (car art2)))))
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501 ;; Finally write this list back to the .nnmh-articles file.
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502 (save-excursion
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503 (set-buffer (get-buffer-create "*nnmh out*"))
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504 (insert ";; Gnus article active file for " group "\n\n")
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505 (insert "(setq nnmh-newsgroup-articles '")
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506 (insert (prin1-to-string articles) ")\n")
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507 (write-region (point-min) (point-max) nnmh-file nil 'nomesg)
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508 (kill-buffer (current-buffer)))))
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509
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510 (defun nnmh-deletable-article-p (group article)
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511 "Say whether ARTICLE in GROUP can be deleted."
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512 (let ((path (concat nnmh-current-directory (int-to-string article))))
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513 (and (file-writable-p path)
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514 (or (not nnmail-keep-last-article)
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515 (not (eq (cdr (nth 1 (assoc group nnmh-group-alist)))
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516 article))))))
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517
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518 (provide 'nnmh)
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519
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520 ;;; nnmh.el ends here
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