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1 ;;; nnheader.el --- header access macros for Gnus and its backends
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2 ;; Copyright (C) 1987,88,89,90,93,94,95,96 Free Software Foundation, Inc.
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3
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4 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
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5 ;; Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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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 ;; These macros may look very much like the ones in GNUS 4.1. They
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28 ;; are, in a way, but you should note that the indices they use have
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29 ;; been changed from the internal GNUS format to the NOV format. The
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30 ;; makes it possible to read headers from XOVER much faster.
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31 ;;
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32 ;; The format of a header is now:
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33 ;; [number subject from date id references chars lines xref]
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34 ;;
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35 ;; (That last entry is defined as "misc" in the NOV format, but Gnus
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36 ;; uses it for xrefs.)
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37
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38 ;;; Code:
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39
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40 (require 'mail-utils)
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41 (eval-when-compile (require 'cl))
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42
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43 (defvar nnheader-max-head-length 4096
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44 "*Max length of the head of articles.")
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45
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46 (defvar nnheader-file-name-translation-alist nil
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47 "*Alist that says how to translate characters in file names.
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48 For instance, if \":\" is illegal as a file character in file names
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49 on your system, you could say something like:
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50
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51 \(setq nnheader-file-name-translation-alist '((?: . ?_)))")
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52
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53 ;;; Header access macros.
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54
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55 (defmacro mail-header-number (header)
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56 "Return article number in HEADER."
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57 `(aref ,header 0))
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58
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59 (defmacro mail-header-set-number (header number)
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60 "Set article number of HEADER to NUMBER."
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61 `(aset ,header 0 ,number))
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62
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63 (defmacro mail-header-subject (header)
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64 "Return subject string in HEADER."
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65 `(aref ,header 1))
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66
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67 (defmacro mail-header-set-subject (header subject)
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68 "Set article subject of HEADER to SUBJECT."
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69 `(aset ,header 1 ,subject))
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70
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71 (defmacro mail-header-from (header)
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72 "Return author string in HEADER."
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73 `(aref ,header 2))
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74
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75 (defmacro mail-header-set-from (header from)
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76 "Set article author of HEADER to FROM."
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77 `(aset ,header 2 ,from))
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78
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79 (defmacro mail-header-date (header)
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80 "Return date in HEADER."
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81 `(aref ,header 3))
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82
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83 (defmacro mail-header-set-date (header date)
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84 "Set article date of HEADER to DATE."
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85 `(aset ,header 3 ,date))
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86
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87 (defalias 'mail-header-message-id 'mail-header-id)
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88 (defmacro mail-header-id (header)
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89 "Return Id in HEADER."
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90 `(aref ,header 4))
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91
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92 (defalias 'mail-header-set-message-id 'mail-header-set-id)
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93 (defmacro mail-header-set-id (header id)
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94 "Set article Id of HEADER to ID."
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95 `(aset ,header 4 ,id))
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96
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97 (defmacro mail-header-references (header)
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98 "Return references in HEADER."
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99 `(aref ,header 5))
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100
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101 (defmacro mail-header-set-references (header ref)
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102 "Set article references of HEADER to REF."
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103 `(aset ,header 5 ,ref))
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104
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105 (defmacro mail-header-chars (header)
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106 "Return number of chars of article in HEADER."
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107 `(aref ,header 6))
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108
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109 (defmacro mail-header-set-chars (header chars)
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110 "Set number of chars in article of HEADER to CHARS."
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111 `(aset ,header 6 ,chars))
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112
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113 (defmacro mail-header-lines (header)
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114 "Return lines in HEADER."
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115 `(aref ,header 7))
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116
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117 (defmacro mail-header-set-lines (header lines)
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118 "Set article lines of HEADER to LINES."
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119 `(aset ,header 7 ,lines))
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120
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121 (defmacro mail-header-xref (header)
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122 "Return xref string in HEADER."
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123 `(aref ,header 8))
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124
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125 (defmacro mail-header-set-xref (header xref)
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126 "Set article xref of HEADER to xref."
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127 `(aset ,header 8 ,xref))
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128
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129 (defun make-mail-header (&optional init)
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130 "Create a new mail header structure initialized with INIT."
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131 (make-vector 9 init))
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132
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133 ;; Parsing headers and NOV lines.
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134
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135 (defsubst nnheader-header-value ()
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136 (buffer-substring (match-end 0) (gnus-point-at-eol)))
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137
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138 (defvar nnheader-newsgroup-none-id 1)
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139
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140 (defun nnheader-parse-head (&optional naked)
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141 (let ((case-fold-search t)
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142 (cur (current-buffer))
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143 (buffer-read-only nil)
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144 end ref in-reply-to lines p)
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145 (goto-char (point-min))
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146 (when naked
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147 (insert "\n"))
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148 ;; Search to the beginning of the next header. Error messages
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149 ;; do not begin with 2 or 3.
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150 (prog1
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151 (when (or naked (re-search-forward "^[23][0-9]+ " nil t))
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152 ;; This implementation of this function, with nine
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153 ;; search-forwards instead of the one re-search-forward and
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154 ;; a case (which basically was the old function) is actually
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155 ;; about twice as fast, even though it looks messier. You
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156 ;; can't have everything, I guess. Speed and elegance
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157 ;; doesn't always go hand in hand.
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158 (vector
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159 ;; Number.
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160 (if naked
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161 (progn
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162 (setq p (point-min))
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163 0)
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164 (prog1
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165 (read cur)
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166 (end-of-line)
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167 (setq p (point))
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168 (narrow-to-region (point)
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169 (or (and (search-forward "\n.\n" nil t)
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170 (- (point) 2))
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171 (point)))))
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172 ;; Subject.
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173 (progn
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174 (goto-char p)
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175 (if (search-forward "\nsubject: " nil t)
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176 (nnheader-header-value) "(none)"))
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177 ;; From.
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178 (progn
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179 (goto-char p)
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180 (if (search-forward "\nfrom: " nil t)
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181 (nnheader-header-value) "(nobody)"))
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182 ;; Date.
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183 (progn
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184 (goto-char p)
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185 (if (search-forward "\ndate: " nil t)
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186 (nnheader-header-value) ""))
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187 ;; Message-ID.
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188 (progn
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189 (goto-char p)
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190 (if (search-forward "\nmessage-id: " nil t)
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191 (nnheader-header-value)
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192 ;; If there was no message-id, we just fake one to make
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193 ;; subsequent routines simpler.
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194 (concat "none+"
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195 (int-to-string
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196 (incf nnheader-newsgroup-none-id)))))
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197 ;; References.
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198 (progn
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199 (goto-char p)
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200 (if (search-forward "\nreferences: " nil t)
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201 (nnheader-header-value)
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202 ;; Get the references from the in-reply-to header if there
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203 ;; were no references and the in-reply-to header looks
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204 ;; promising.
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205 (if (and (search-forward "\nin-reply-to: " nil t)
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206 (setq in-reply-to (nnheader-header-value))
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207 (string-match "<[^>]+>" in-reply-to))
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208 (substring in-reply-to (match-beginning 0)
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209 (match-end 0))
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210 "")))
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211 ;; Chars.
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212 0
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213 ;; Lines.
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214 (progn
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215 (goto-char p)
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216 (if (search-forward "\nlines: " nil t)
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217 (if (numberp (setq lines (read cur)))
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218 lines 0)
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219 0))
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220 ;; Xref.
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221 (progn
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222 (goto-char p)
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223 (and (search-forward "\nxref: " nil t)
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224 (nnheader-header-value)))))
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225 (when naked
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226 (goto-char (point-min))
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227 (delete-char 1)))))
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228
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229 (defun nnheader-insert-nov (header)
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230 (princ (mail-header-number header) (current-buffer))
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231 (insert
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232 "\t"
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233 (or (mail-header-subject header) "(none)") "\t"
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234 (or (mail-header-from header) "(nobody)") "\t"
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235 (or (mail-header-date header) "") "\t"
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236 (or (mail-header-id header)
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237 (nnmail-message-id)) "\t"
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238 (or (mail-header-references header) "") "\t")
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239 (princ (or (mail-header-chars header) 0) (current-buffer))
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240 (insert "\t")
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241 (princ (or (mail-header-lines header) 0) (current-buffer))
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242 (insert "\t")
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243 (when (mail-header-xref header)
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244 (insert "Xref: " (mail-header-xref header) "\t"))
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245 (insert "\n"))
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246
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247 (defun nnheader-insert-article-line (article)
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248 (goto-char (point-min))
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249 (insert "220 ")
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250 (princ article (current-buffer))
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251 (insert " Article retrieved.\n")
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252 (search-forward "\n\n" nil 'move)
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253 (delete-region (point) (point-max))
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254 (forward-char -1)
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255 (insert "."))
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256
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257 ;; Various cruft the backends and Gnus need to communicate.
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258
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259 (defvar nntp-server-buffer nil)
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260 (defvar gnus-verbose-backends 7
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261 "*A number that says how talkative the Gnus backends should be.")
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262 (defvar gnus-nov-is-evil nil
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263 "If non-nil, Gnus backends will never output headers in the NOV format.")
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264 (defvar news-reply-yank-from nil)
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265 (defvar news-reply-yank-message-id nil)
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266
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267 (defvar nnheader-callback-function nil)
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268
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269 (defun nnheader-init-server-buffer ()
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270 "Initialize the Gnus-backend communication buffer."
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271 (save-excursion
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272 (setq nntp-server-buffer (get-buffer-create " *nntpd*"))
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273 (set-buffer nntp-server-buffer)
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274 (buffer-disable-undo (current-buffer))
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275 (erase-buffer)
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276 (kill-all-local-variables)
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277 (setq case-fold-search t) ;Should ignore case.
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278 t))
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279
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280
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281 ;;; Various functions the backends use.
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282
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283 (defun nnheader-file-error (file)
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284 "Return a string that says what is wrong with FILE."
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285 (format
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286 (cond
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287 ((not (file-exists-p file))
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288 "%s does not exist")
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289 ((file-directory-p file)
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290 "%s is a directory")
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291 ((not (file-readable-p file))
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292 "%s is not readable"))
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293 file))
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294
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295 (defun nnheader-insert-head (file)
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296 "Insert the head of the article."
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297 (when (file-exists-p file)
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298 (if (eq nnheader-max-head-length t)
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299 ;; Just read the entire file.
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300 (nnheader-insert-file-contents-literally file)
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301 ;; Read 1K blocks until we find a separator.
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302 (let ((beg 0)
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303 format-alist
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304 (chop 1024))
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305 (while (and (eq chop (nth 1 (insert-file-contents
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306 file nil beg (incf beg chop))))
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307 (prog1 (not (search-forward "\n\n" nil t))
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308 (goto-char (point-max)))
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309 (or (null nnheader-max-head-length)
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310 (< beg nnheader-max-head-length))))))
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311 t))
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312
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313 (defun nnheader-article-p ()
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314 "Say whether the current buffer looks like an article."
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315 (goto-char (point-min))
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316 (if (not (search-forward "\n\n" nil t))
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317 nil
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318 (narrow-to-region (point-min) (1- (point)))
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319 (goto-char (point-min))
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320 (while (looking-at "[A-Z][^ \t]+:.*\n\\([ \t].*\n\\)*\\|From .*\n")
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321 (goto-char (match-end 0)))
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322 (prog1
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323 (eobp)
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324 (widen))))
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325
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326 (defun nnheader-insert-references (references message-id)
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327 "Insert a References header based on REFERENCES and MESSAGE-ID."
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328 (if (and (not references) (not message-id))
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329 () ; This is illegal, but not all articles have Message-IDs.
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330 (mail-position-on-field "References")
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331 (let ((begin (save-excursion (beginning-of-line) (point)))
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332 (fill-column 78)
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333 (fill-prefix "\t"))
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334 (if references (insert references))
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335 (if (and references message-id) (insert " "))
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336 (if message-id (insert message-id))
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337 ;; Fold long References lines to conform to RFC1036 (sort of).
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338 ;; The region must end with a newline to fill the region
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339 ;; without inserting extra newline.
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340 (fill-region-as-paragraph begin (1+ (point))))))
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341
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342 (defun nnheader-replace-header (header new-value)
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343 "Remove HEADER and insert the NEW-VALUE."
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344 (save-excursion
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345 (save-restriction
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346 (nnheader-narrow-to-headers)
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347 (prog1
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348 (message-remove-header header)
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349 (goto-char (point-max))
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350 (insert header ": " new-value "\n")))))
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351
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352 (defun nnheader-narrow-to-headers ()
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353 "Narrow to the head of an article."
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354 (widen)
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355 (narrow-to-region
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356 (goto-char (point-min))
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357 (if (search-forward "\n\n" nil t)
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358 (1- (point))
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359 (point-max)))
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360 (goto-char (point-min)))
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361
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362 (defun nnheader-set-temp-buffer (name)
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363 "Set-buffer to an empty (possibly new) buffer called NAME with undo disabled."
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364 (set-buffer (get-buffer-create name))
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365 (buffer-disable-undo (current-buffer))
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366 (erase-buffer)
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367 (current-buffer))
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368
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369 (defmacro nnheader-temp-write (file &rest forms)
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370 "Create a new buffer, evaluate FORM there, and write the buffer to FILE."
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371 `(save-excursion
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372 (let ((nnheader-temp-file ,file)
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373 (nnheader-temp-cur-buffer
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374 (nnheader-set-temp-buffer
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375 (generate-new-buffer-name " *nnheader temp*"))))
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376 (when (and nnheader-temp-file
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377 (not (file-directory-p (file-name-directory
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378 nnheader-temp-file))))
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379 (make-directory (file-name-directory nnheader-temp-file) t))
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380 (unwind-protect
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381 (prog1
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382 (progn
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383 ,@forms)
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384 (when nnheader-temp-file
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385 (set-buffer nnheader-temp-cur-buffer)
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386 (write-region (point-min) (point-max)
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387 nnheader-temp-file nil 'nomesg)))
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388 (when (buffer-name nnheader-temp-cur-buffer)
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389 (kill-buffer nnheader-temp-cur-buffer))))))
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390
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391 (put 'nnheader-temp-write 'lisp-indent-function 1)
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392 (put 'nnheader-temp-write 'lisp-indent-hook 1)
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393 (put 'nnheader-temp-write 'edebug-form-spec '(form body))
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394
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395 (defvar jka-compr-compression-info-list)
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396 (defvar nnheader-numerical-files
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397 (if (boundp 'jka-compr-compression-info-list)
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398 (concat "\\([0-9]+\\)\\("
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399 (mapconcat (lambda (i) (aref i 0))
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400 jka-compr-compression-info-list "\\|")
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401 "\\)?")
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402 "[0-9]+$")
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403 "Regexp that match numerical files.")
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404
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405 (defvar nnheader-numerical-short-files (concat "^" nnheader-numerical-files)
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406 "Regexp that matches numerical file names.")
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407
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408 (defvar nnheader-numerical-full-files (concat "/" nnheader-numerical-files)
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409 "Regexp that matches numerical full file paths.")
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410
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411 (defsubst nnheader-file-to-number (file)
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412 "Take a file name and return the article number."
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413 (if (not (boundp 'jka-compr-compression-info-list))
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414 (string-to-int file)
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415 (string-match nnheader-numerical-short-files file)
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416 (string-to-int (match-string 0 file))))
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417
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418 (defun nnheader-directory-files-safe (&rest args)
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419 ;; It has been reported numerous times that `directory-files'
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420 ;; fails with an alarming frequency on NFS mounted file systems.
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421 ;; This function executes that function twice and returns
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422 ;; the longest result.
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423 (let ((first (apply 'directory-files args))
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424 (second (apply 'directory-files args)))
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425 (if (> (length first) (length second))
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426 first
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427 second)))
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428
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429 (defun nnheader-directory-articles (dir)
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430 "Return a list of all article files in a directory."
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431 (mapcar 'nnheader-file-to-number
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432 (nnheader-directory-files-safe
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433 dir nil nnheader-numerical-short-files t)))
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434
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435 (defun nnheader-article-to-file-alist (dir)
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436 "Return an alist of article/file pairs in DIR."
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437 (mapcar (lambda (file) (cons (nnheader-file-to-number file) file))
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438 (nnheader-directory-files-safe
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439 dir nil nnheader-numerical-short-files t)))
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440
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441 (defun nnheader-fold-continuation-lines ()
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442 "Fold continuation lines in the current buffer."
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443 (goto-char (point-min))
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444 (while (re-search-forward "\\(\r?\n[ \t]+\\)+" nil t)
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445 (replace-match " " t t)))
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446
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447 (defun nnheader-translate-file-chars (file)
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448 (if (null nnheader-file-name-translation-alist)
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449 ;; No translation is necessary.
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450 file
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451 ;; We translate -- but only the file name. We leave the directory
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452 ;; alone.
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453 (let* ((i 0)
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454 trans leaf path len)
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455 (if (string-match "/[^/]+\\'" file)
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456 ;; This is needed on NT's and stuff.
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457 (setq leaf (substring file (1+ (match-beginning 0)))
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458 path (substring file 0 (1+ (match-beginning 0))))
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459 ;; Fall back on this.
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460 (setq leaf (file-name-nondirectory file)
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461 path (file-name-directory file)))
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462 (setq len (length leaf))
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463 (while (< i len)
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464 (when (setq trans (cdr (assq (aref leaf i)
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465 nnheader-file-name-translation-alist)))
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466 (aset leaf i trans))
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467 (incf i))
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468 (concat path leaf))))
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469
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470 (defun nnheader-report (backend &rest args)
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471 "Report an error from the BACKEND.
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472 The first string in ARGS can be a format string."
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473 (set (intern (format "%s-status-string" backend))
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474 (if (< (length args) 2)
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475 (car args)
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476 (apply 'format args)))
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477 nil)
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478
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479 (defun nnheader-get-report (backend)
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480 (message "%s" (symbol-value (intern (format "%s-status-string" backend)))))
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481
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482 (defun nnheader-insert (format &rest args)
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483 "Clear the communicaton buffer and insert FORMAT and ARGS into the buffer.
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484 If FORMAT isn't a format string, it and all ARGS will be inserted
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485 without formatting."
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486 (save-excursion
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487 (set-buffer nntp-server-buffer)
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488 (erase-buffer)
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489 (if (string-match "%" format)
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490 (insert (apply 'format format args))
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491 (apply 'insert format args))
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492 t))
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493
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494 (defun nnheader-mail-file-mbox-p (file)
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495 "Say whether FILE looks like an Unix mbox file."
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496 (when (and (file-exists-p file)
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497 (file-readable-p file)
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498 (file-regular-p file))
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499 (save-excursion
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500 (nnheader-set-temp-buffer " *mail-file-mbox-p*")
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501 (nnheader-insert-file-contents-literally file)
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502 (goto-char (point-min))
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503 (prog1
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504 (looking-at message-unix-mail-delimiter)
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505 (kill-buffer (current-buffer))))))
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506
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507 (defun nnheader-replace-chars-in-string (string from to)
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508 "Replace characters in STRING from FROM to TO."
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509 (let ((string (substring string 0)) ;Copy string.
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510 (len (length string))
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511 (idx 0))
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512 ;; Replace all occurrences of FROM with TO.
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513 (while (< idx len)
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514 (if (= (aref string idx) from)
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515 (aset string idx to))
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516 (setq idx (1+ idx)))
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517 string))
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518
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519 (defun nnheader-file-to-group (file &optional top)
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520 "Return a group name based on FILE and TOP."
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521 (nnheader-replace-chars-in-string
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522 (if (not top)
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523 file
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524 (condition-case ()
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525 (substring (expand-file-name file)
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526 (length
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527 (expand-file-name
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528 (file-name-as-directory top))))
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529 (error "")))
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530 ?/ ?.))
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531
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532 (defun nnheader-message (level &rest args)
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533 "Message if the Gnus backends are talkative."
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534 (if (or (not (numberp gnus-verbose-backends))
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535 (<= level gnus-verbose-backends))
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536 (apply 'message args)
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537 (apply 'format args)))
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538
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539 (defun nnheader-be-verbose (level)
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540 "Return whether the backends should be verbose on LEVEL."
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|
541 (or (not (numberp gnus-verbose-backends))
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542 (<= level gnus-verbose-backends)))
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543
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|
544 (defun nnheader-group-pathname (group dir &optional file)
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545 "Make pathname for GROUP."
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|
546 (concat
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547 (let ((dir (file-name-as-directory (expand-file-name dir))))
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548 ;; If this directory exists, we use it directly.
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549 (if (file-directory-p (concat dir group))
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550 (concat dir group "/")
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551 ;; If not, we translate dots into slashes.
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552 (concat dir (nnheader-replace-chars-in-string group ?. ?/) "/")))
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553 (cond ((null file) "")
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554 ((numberp file) (int-to-string file))
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555 (t file))))
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556
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557 (defun nnheader-functionp (form)
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558 "Return non-nil if FORM is funcallable."
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559 (or (and (symbolp form) (fboundp form))
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560 (and (listp form) (eq (car form) 'lambda))))
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561
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562 (defun nnheader-concat (dir file)
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563 "Concat DIR as directory to FILE."
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|
564 (concat (file-name-as-directory dir) file))
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565
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566 (defun nnheader-ms-strip-cr ()
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567 "Strip ^M from the end of all lines."
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|
568 (save-excursion
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569 (goto-char (point-min))
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570 (while (re-search-forward "\r$" nil t)
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|
|
571 (delete-backward-char 1))))
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572
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|
2
|
573 (defun nnheader-file-size (file)
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|
574 "Return the file size of FILE or 0."
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|
|
575 (or (nth 7 (file-attributes file)) 0))
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576
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577 (defun nnheader-find-etc-directory (package)
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578 "Go through the path and find the \".../etc/PACKAGE\" directory."
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|
|
579 (let ((path load-path)
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580 dir result)
|
|
|
581 ;; We try to find the dir by looking at the load path,
|
|
|
582 ;; stripping away the last component and adding "etc/".
|
|
|
583 (while path
|
|
|
584 (if (and (car path)
|
|
|
585 (file-exists-p
|
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|
586 (setq dir (concat
|
|
|
587 (file-name-directory
|
|
|
588 (directory-file-name (car path)))
|
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|
589 "etc/" package "/")))
|
|
|
590 (file-directory-p dir))
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|
|
591 (setq result dir
|
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592 path nil)
|
|
|
593 (setq path (cdr path))))
|
|
|
594 result))
|
|
|
595
|
|
|
596 (defvar ange-ftp-path-format)
|
|
|
597 (defvar efs-path-regexp)
|
|
|
598 (defun nnheader-re-read-dir (path)
|
|
|
599 "Re-read directory PATH if PATH is on a remote system."
|
|
|
600 (if (and (fboundp 'efs-re-read-dir) (boundp 'efs-path-regexp))
|
|
|
601 (when (string-match efs-path-regexp path)
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|
602 (efs-re-read-dir path))
|
|
|
603 (if (and (fboundp 'ange-ftp-re-read-dir) (boundp 'ange-ftp-path-format))
|
|
|
604 (when (string-match (car ange-ftp-path-format) path)
|
|
|
605 (ange-ftp-re-read-dir path)))))
|
|
|
606
|
|
0
|
607 (fset 'nnheader-run-at-time 'run-at-time)
|
|
|
608 (fset 'nnheader-cancel-timer 'cancel-timer)
|
|
|
609 (fset 'nnheader-find-file-noselect 'find-file-noselect)
|
|
|
610 (fset 'nnheader-insert-file-contents-literally
|
|
|
611 'insert-file-contents-literally)
|
|
|
612
|
|
|
613 (when (string-match "XEmacs\\|Lucid" emacs-version)
|
|
|
614 (require 'nnheaderxm))
|
|
|
615
|
|
|
616 (run-hooks 'nnheader-load-hook)
|
|
|
617
|
|
|
618 (provide 'nnheader)
|
|
|
619
|
|
|
620 ;;; nnheader.el ends here
|
