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1 ;;; nneething.el --- random file 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 ;; 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 ;;; Code:
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28
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29 (require 'nnheader)
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30 (require 'nnmail)
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31 (require 'nnoo)
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32 (require 'gnus-util)
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33 (require 'cl)
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34
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35 (nnoo-declare nneething)
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36
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37 (defvoo nneething-map-file-directory "~/.nneething/"
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112
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38 "Where nneething stores the map files.")
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39
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40 (defvoo nneething-map-file ".nneething"
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41 "Name of the map files.")
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42
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43 (defvoo nneething-exclude-files nil
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44 "Regexp saying what files to exclude from the group.
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45 If this variable is nil, no files will be excluded.")
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46
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47
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48
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49 ;;; Internal variables.
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50
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51 (defconst nneething-version "nneething 1.0"
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52 "nneething version.")
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53
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54 (defvoo nneething-current-directory nil
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55 "Current news group directory.")
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56
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57 (defvoo nneething-status-string "")
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58
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59 (defvoo nneething-message-id-number 0)
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60 (defvoo nneething-work-buffer " *nneething work*")
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61
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62 (defvoo nneething-group nil)
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63 (defvoo nneething-map nil)
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64 (defvoo nneething-read-only nil)
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65 (defvoo nneething-active 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 nneething)
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72
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73 (deffoo nneething-retrieve-headers (articles &optional group server fetch-old)
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74 (nneething-possibly-change-directory group)
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75
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76 (save-excursion
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77 (set-buffer nntp-server-buffer)
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78 (erase-buffer)
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79 (let* ((number (length articles))
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80 (count 0)
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81 (large (and (numberp nnmail-large-newsgroup)
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82 (> number nnmail-large-newsgroup)))
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83 article file)
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84
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85 (if (stringp (car articles))
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86 'headers
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87
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88 (while (setq article (pop articles))
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89 (setq file (nneething-file-name article))
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90
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91 (when (and (file-exists-p file)
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92 (or (file-directory-p file)
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93 (not (zerop (nnheader-file-size file)))))
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94 (insert (format "221 %d Article retrieved.\n" article))
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95 (nneething-insert-head file)
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96 (insert ".\n"))
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97
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98 (incf count)
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99
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100 (and large
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101 (zerop (% count 20))
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102 (message "nneething: Receiving headers... %d%%"
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103 (/ (* count 100) number))))
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104
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105 (when large
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106 (message "nneething: Receiving headers...done"))
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107
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108 (nnheader-fold-continuation-lines)
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109 'headers))))
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110
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111 (deffoo nneething-request-article (id &optional group server buffer)
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112 (nneething-possibly-change-directory group)
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113 (let ((file (unless (stringp id)
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114 (nneething-file-name id)))
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115 (nntp-server-buffer (or buffer nntp-server-buffer)))
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116 (and (stringp file) ; We did not request by Message-ID.
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117 (file-exists-p file) ; The file exists.
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118 (not (file-directory-p file)) ; It's not a dir.
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119 (save-excursion
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120 (nnmail-find-file file) ; Insert the file in the nntp buf.
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121 (unless (nnheader-article-p) ; Either it's a real article...
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122 (goto-char (point-min))
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123 (nneething-make-head file (current-buffer)) ; ... or we fake some headers.
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124 (insert "\n"))
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125 t))))
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126
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112
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127 (deffoo nneething-request-group (group &optional server dont-check)
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128 (nneething-possibly-change-directory group server)
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129 (unless dont-check
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130 (nneething-create-mapping)
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131 (if (> (car nneething-active) (cdr nneething-active))
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132 (nnheader-insert "211 0 1 0 %s\n" group)
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133 (nnheader-insert
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134 "211 %d %d %d %s\n"
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135 (- (1+ (cdr nneething-active)) (car nneething-active))
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136 (car nneething-active) (cdr nneething-active)
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137 group)))
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138 t)
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139
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140 (deffoo nneething-request-list (&optional server dir)
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141 (nnheader-report 'nneething "LIST is not implemented."))
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142
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143 (deffoo nneething-request-newgroups (date &optional server)
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144 (nnheader-report 'nneething "NEWSGROUPS is not implemented."))
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145
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146 (deffoo nneething-request-type (group &optional article)
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147 'unknown)
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148
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149 (deffoo nneething-close-group (group &optional server)
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150 (setq nneething-current-directory nil)
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151 t)
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152
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114
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153 (deffoo nneething-open-server (server &optional defs)
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154 (nnheader-init-server-buffer)
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155 (if (nneething-server-opened server)
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156 t
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157 (unless (assq 'nneething-directory defs)
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158 (setq defs (append defs (list (list 'nneething-directory server)))))
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159 (nnoo-change-server 'nneething server defs)))
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160
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161
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162 ;;; Internal functions.
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163
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114
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164 (defun nneething-possibly-change-directory (group &optional server)
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165 (when (and server
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166 (not (nneething-server-opened server)))
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167 (nneething-open-server server))
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168 (when (and group
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169 (not (equal nneething-group group)))
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170 (setq nneething-group group)
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171 (setq nneething-map nil)
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172 (setq nneething-active (cons 1 0))
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173 (nneething-create-mapping)))
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174
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175 (defun nneething-map-file ()
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176 ;; We make sure that the .nneething directory exists.
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177 (gnus-make-directory nneething-map-file-directory)
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178 ;; We store it in a special directory under the user's home dir.
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179 (concat (file-name-as-directory nneething-map-file-directory)
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180 nneething-group nneething-map-file))
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181
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182 (defun nneething-create-mapping ()
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183 ;; Read nneething-active and nneething-map.
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184 (when (file-exists-p nneething-directory)
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185 (let ((map-file (nneething-map-file))
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186 (files (directory-files nneething-directory))
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187 touched map-files)
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188 (when (file-exists-p map-file)
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189 (ignore-errors
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190 (load map-file nil t t)))
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191 (unless nneething-active
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192 (setq nneething-active (cons 1 0)))
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193 ;; Old nneething had a different map format.
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194 (when (and (cdar nneething-map)
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195 (atom (cdar nneething-map)))
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196 (setq nneething-map
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197 (mapcar (lambda (n)
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198 (list (cdr n) (car n)
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199 (nth 5 (file-attributes
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200 (nneething-file-name (car n))))))
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201 nneething-map)))
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202 ;; Remove files matching the exclusion regexp.
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203 (when nneething-exclude-files
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204 (let ((f files)
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205 prev)
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206 (while f
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207 (if (string-match nneething-exclude-files (car f))
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208 (if prev (setcdr prev (cdr f))
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209 (setq files (cdr files)))
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210 (setq prev f))
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211 (setq f (cdr f)))))
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212 ;; Remove deleted files from the map.
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213 (let ((map nneething-map)
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214 prev)
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215 (while map
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216 (if (and (member (cadar map) files)
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217 ;; We also remove files that have changed mod times.
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218 (equal (nth 5 (file-attributes
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219 (nneething-file-name (cadar map))))
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220 (caddar map)))
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221 (progn
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222 (push (cadar map) map-files)
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223 (setq prev map))
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224 (setq touched t)
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225 (if prev
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226 (setcdr prev (cdr map))
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227 (setq nneething-map (cdr nneething-map))))
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228 (setq map (cdr map))))
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229 ;; Find all new files and enter them into the map.
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230 (while files
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231 (unless (member (car files) map-files)
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232 ;; This file is not in the map, so we enter it.
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233 (setq touched t)
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234 (setcdr nneething-active (1+ (cdr nneething-active)))
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235 (push (list (cdr nneething-active) (car files)
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236 (nth 5 (file-attributes
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237 (nneething-file-name (car files)))))
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238 nneething-map))
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239 (setq files (cdr files)))
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240 (when (and touched
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241 (not nneething-read-only))
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242 (nnheader-temp-write map-file
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243 (insert "(setq nneething-map '")
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244 (gnus-prin1 nneething-map)
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245 (insert ")\n(setq nneething-active '")
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246 (gnus-prin1 nneething-active)
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247 (insert ")\n"))))))
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248
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249 (defun nneething-insert-head (file)
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250 "Insert the head of FILE."
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251 (when (nneething-get-head file)
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252 (insert-buffer-substring nneething-work-buffer)
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253 (goto-char (point-max))))
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254
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255 (defun nneething-make-head (file &optional buffer)
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256 "Create a head by looking at the file attributes of FILE."
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257 (let ((atts (file-attributes file)))
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258 (insert
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259 "Subject: " (file-name-nondirectory file) "\n"
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260 "Message-ID: <nneething-"
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261 (int-to-string (incf nneething-message-id-number))
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262 "@" (system-name) ">\n"
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263 (if (equal '(0 0) (nth 5 atts)) ""
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264 (concat "Date: " (current-time-string (nth 5 atts)) "\n"))
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265 (or (when buffer
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266 (save-excursion
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267 (set-buffer buffer)
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268 (when (re-search-forward "<[a-zA-Z0-9_]@[-a-zA-Z0-9_]>" 1000 t)
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269 (concat "From: " (match-string 0) "\n"))))
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270 (nneething-from-line (nth 2 atts) file))
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271 (if (> (string-to-int (int-to-string (nth 7 atts))) 0)
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272 (concat "Chars: " (int-to-string (nth 7 atts)) "\n")
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273 "")
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108
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274 (if buffer
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275 (save-excursion
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276 (set-buffer buffer)
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277 (concat "Lines: " (int-to-string
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278 (count-lines (point-min) (point-max)))
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279 "\n"))
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280 "")
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281 )))
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282
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283 (defun nneething-from-line (uid &optional file)
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284 "Return a From header based of UID."
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285 (let* ((login (condition-case nil
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286 (user-login-name uid)
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287 (error
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288 (cond ((= uid (user-uid)) (user-login-name))
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289 ((zerop uid) "root")
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290 (t (int-to-string uid))))))
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108
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291 (name (condition-case nil
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292 (user-full-name uid)
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293 (error
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294 (cond ((= uid (user-uid)) (user-full-name))
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295 ((zerop uid) "Ms. Root")))))
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296 (host (if (string-match "\\`/[^/@]*@\\([^:/]+\\):" file)
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297 (prog1
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298 (substring file
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299 (match-beginning 1)
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300 (match-end 1))
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301 (when (string-match "/\\(users\\|home\\)/\\([^/]+\\)/" file)
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302 (setq login (substring file
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303 (match-beginning 2)
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304 (match-end 2))
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305 name nil)))
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306 (system-name))))
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307 (concat "From: " login "@" host
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308 (if name (concat " (" name ")") "") "\n")))
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309
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310 (defun nneething-get-head (file)
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311 "Either find the head in FILE or make a head for FILE."
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312 (save-excursion
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313 (set-buffer (get-buffer-create nneething-work-buffer))
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314 (setq case-fold-search nil)
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315 (buffer-disable-undo (current-buffer))
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316 (erase-buffer)
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108
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317 (cond
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318 ((not (file-exists-p file))
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319 ;; The file do not exist.
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320 nil)
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321 ((or (file-directory-p file)
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322 (file-symlink-p file))
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323 ;; It's a dir, so we fudge a head.
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324 (nneething-make-head file) t)
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108
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325 (t
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326 ;; We examine the file.
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327 (nnheader-insert-head file)
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328 (if (nnheader-article-p)
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108
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329 (delete-region
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330 (progn
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331 (goto-char (point-min))
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332 (or (and (search-forward "\n\n" nil t)
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333 (1- (point)))
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334 (point-max)))
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335 (point-max))
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336 (goto-char (point-min))
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337 (nneething-make-head file (current-buffer))
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338 (delete-region (point) (point-max)))
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339 t))))
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340
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341 (defun nneething-file-name (article)
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342 "Return the file name of ARTICLE."
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343 (concat (file-name-as-directory nneething-directory)
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344 (if (numberp article)
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345 (cadr (assq article nneething-map))
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346 article)))
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347
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348 (provide 'nneething)
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349
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350 ;;; nneething.el ends here
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