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1 ;;; mail-utils.el --- utility functions used both by rmail and rnews
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2
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3 ;; Copyright (C) 1985 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: mail, news
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; 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 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; 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 XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: FSF 19.30.
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25
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26 ;;; Commentary:
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27
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28 ;; Utility functions for mail and netnews handling. These handle fine
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29 ;; points of header parsing.
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30
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31 ;;; Code:
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32
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33 ;;; We require lisp-mode to make sure that lisp-mode-syntax-table has
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34 ;;; been initialized.
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35 (require 'lisp-mode)
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36
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37 ;;;###autoload
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38 (defvar mail-use-rfc822 nil "\
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39 *If non-nil, use a full, hairy RFC822 parser on mail addresses.
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40 Otherwise, (the default) use a smaller, somewhat faster, and
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41 often correct parser.")
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42
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43 ;; Returns t if file FILE is an Rmail file.
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44 ;;;###autoload
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45 (defun mail-file-babyl-p (file)
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46 (let ((buf (generate-new-buffer " *rmail-file-p*")))
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47 (unwind-protect
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48 (save-excursion
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49 (set-buffer buf)
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50 (insert-file-contents file nil 0 100)
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51 (looking-at "BABYL OPTIONS:"))
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52 (kill-buffer buf))))
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53
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54 (defun mail-string-delete (string start end)
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55 "Returns a string containing all of STRING except the part
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56 from START (inclusive) to END (exclusive)."
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57 (if (null end) (substring string 0 start)
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58 (concat (substring string 0 start)
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59 (substring string end nil))))
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60
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61 (defun mail-strip-quoted-names (address)
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62 "Delete comments and quoted strings in an address list ADDRESS.
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63 Also delete leading/trailing whitespace and replace FOO <BAR> with just BAR.
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64 Return a modified address list."
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65 (if (null address)
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66 nil
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67 (if mail-use-rfc822
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68 (progn (require 'rfc822)
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69 (mapconcat 'identity (rfc822-addresses address) ", "))
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70 (let (pos)
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71 (string-match "\\`[ \t\n]*" address)
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72 ;; strip surrounding whitespace
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73 (setq address (substring address
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74 (match-end 0)
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75 (string-match "[ \t\n]*\\'" address
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76 (match-end 0))))
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77
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78 ;; Detect nested comments.
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79 (if (string-match "[ \t]*(\\([^)\"\\]\\|\\\\.\\|\\\\\n\\)*(" address)
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80 ;; Strip nested comments.
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81 (save-excursion
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82 (set-buffer (get-buffer-create " *temp*"))
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83 (erase-buffer)
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84 (insert address)
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85 (set-syntax-table lisp-mode-syntax-table)
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86 (goto-char 1)
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87 (while (search-forward "(" nil t)
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88 (forward-char -1)
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89 (skip-chars-backward " \t")
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90 (delete-region (point)
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91 (save-excursion
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92 (condition-case ()
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93 (forward-sexp 1)
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94 (error (goto-char (point-max))))
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95 (point))))
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96 (setq address (buffer-string))
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97 (erase-buffer))
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98 ;; Strip non-nested comments an easier way.
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99 (while (setq pos (string-match
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100 ;; This doesn't hack rfc822 nested comments
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101 ;; `(xyzzy (foo) whinge)' properly. Big deal.
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102 "[ \t]*(\\([^)\"\\]\\|\\\\.\\|\\\\\n\\)*)"
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103 address))
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104 (setq address
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105 (mail-string-delete address
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106 pos (match-end 0)))))
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107
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108 ;; strip `quoted' names (This is supposed to hack `"Foo Bar" <bar@host>')
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109 (setq pos 0)
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110 (while (setq pos (string-match
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111 "[ \t]*\"\\([^\"\\]\\|\\\\.\\|\\\\\n\\)*\"[ \t\n]*"
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112 address pos))
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113 ;; If the next thing is "@", we have "foo bar"@host. Leave it.
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114 (if (and (> (length address) (match-end 0))
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115 (= (aref address (match-end 0)) ?@))
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116 (setq pos (match-end 0))
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117 (setq address
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118 (mail-string-delete address
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119 pos (match-end 0)))))
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120 ;; Retain only part of address in <> delims, if there is such a thing.
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121 (while (setq pos (string-match "\\(,\\s-*\\|\\`\\)[^,]*<\\([^>,]*>\\)"
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122 address))
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123 (let ((junk-beg (match-end 1))
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124 (junk-end (match-beginning 2))
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125 (close (match-end 0)))
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126 (setq address (mail-string-delete address (1- close) close))
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127 (setq address (mail-string-delete address junk-beg junk-end))))
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128 address))))
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129
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130 (or (and (boundp 'rmail-default-dont-reply-to-names)
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131 (not (null rmail-default-dont-reply-to-names)))
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132 (setq rmail-default-dont-reply-to-names "info-"))
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133
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134 ; rmail-dont-reply-to-names is defined in loaddefs
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135 (defun rmail-dont-reply-to (userids)
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136 "Returns string of mail addresses USERIDS sans any recipients
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137 that start with matches for `rmail-dont-reply-to-names'.
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138 Usenet paths ending in an element that matches are removed also."
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139 (if (null rmail-dont-reply-to-names)
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140 (setq rmail-dont-reply-to-names
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141 (concat (if rmail-default-dont-reply-to-names
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142 (concat rmail-default-dont-reply-to-names "\\|")
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143 "")
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144 (concat (regexp-quote (user-login-name))
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145 "\\>"))))
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146 (let ((match (concat "\\(^\\|,\\)[ \t\n]*\\([^,\n]*!\\|\\)\\("
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147 rmail-dont-reply-to-names
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148 "\\)"))
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149 (case-fold-search t)
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150 pos epos)
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151 (while (setq pos (string-match match userids))
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152 (if (> pos 0) (setq pos (match-beginning 2)))
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153 (setq epos
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154 ;; Delete thru the next comma, plus whitespace after.
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155 (if (string-match ",[ \t\n]+" userids (match-end 0))
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156 (match-end 0)
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157 (length userids)))
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158 (setq userids
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159 (mail-string-delete
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160 userids pos epos)))
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161 ;; get rid of any trailing commas
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162 (if (setq pos (string-match "[ ,\t\n]*\\'" userids))
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163 (setq userids (substring userids 0 pos)))
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164 ;; remove leading spaces. they bother me.
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165 (if (string-match "\\s *" userids)
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166 (substring userids (match-end 0))
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167 userids)))
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168
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169 ;;;###autoload
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170 (defun mail-fetch-field (field-name &optional last all)
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171 "Return the value of the header field FIELD-NAME.
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172 The buffer is expected to be narrowed to just the headers of the message.
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173 If second arg LAST is non-nil, use the last such field if there are several.
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174 If third arg ALL is non-nil, concatenate all such fields with commas between."
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175 (save-excursion
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176 (goto-char (point-min))
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177 (let ((case-fold-search t)
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178 (name (concat "^" (regexp-quote field-name) "[ \t]*:[ \t]*")))
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179 (if all
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180 (let ((value ""))
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181 (while (re-search-forward name nil t)
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182 (let ((opoint (point)))
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183 (while (progn (forward-line 1)
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184 (looking-at "[ \t]")))
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185 ;; Back up over newline, then trailing spaces or tabs
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186 (forward-char -1)
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187 (while (member (preceding-char) '(? ?\t))
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188 (forward-char -1))
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189 (setq value (concat value
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190 (if (string= value "") "" ", ")
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191 (buffer-substring-no-properties
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192 opoint (point))))))
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193 (and (not (string= value "")) value))
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194 (if (re-search-forward name nil t)
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195 (progn
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196 (if last (while (re-search-forward name nil t)))
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197 (let ((opoint (point)))
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198 (while (progn (forward-line 1)
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199 (looking-at "[ \t]")))
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200 ;; Back up over newline, then trailing spaces or tabs
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201 (forward-char -1)
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202 (while (member (preceding-char) '(? ?\t))
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203 (forward-char -1))
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204 (buffer-substring-no-properties opoint (point)))))))))
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205
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206 ;; Parse a list of tokens separated by commas.
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207 ;; It runs from point to the end of the visible part of the buffer.
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208 ;; Whitespace before or after tokens is ignored,
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209 ;; but whitespace within tokens is kept.
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210 (defun mail-parse-comma-list ()
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211 (let (accumulated
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212 beg)
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213 (skip-chars-forward " ")
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214 (while (not (eobp))
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215 (setq beg (point))
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216 (skip-chars-forward "^,")
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217 (skip-chars-backward " ")
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218 (setq accumulated
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219 (cons (buffer-substring beg (point))
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220 accumulated))
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221 (skip-chars-forward "^,")
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222 (skip-chars-forward ", "))
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223 accumulated))
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224
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225 (defun mail-comma-list-regexp (labels)
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226 (let (pos)
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227 (setq pos (or (string-match "[^ \t]" labels) 0))
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228 ;; Remove leading and trailing whitespace.
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229 (setq labels (substring labels pos (string-match "[ \t]*$" labels pos)))
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230 ;; Change each comma to \|, and flush surrounding whitespace.
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231 (while (setq pos (string-match "[ \t]*,[ \t]*" labels))
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232 (setq labels
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233 (concat (substring labels 0 pos)
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234 "\\|"
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235 (substring labels (match-end 0))))))
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236 labels)
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237
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238 (defun mail-rfc822-time-zone (time)
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239 (let* ((sec (or (car (current-time-zone time)) 0))
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240 (absmin (/ (abs sec) 60)))
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241 (format "%c%02d%02d" (if (< sec 0) ?- ?+) (/ absmin 60) (% absmin 60))))
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242
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243 (defun mail-rfc822-date ()
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244 (let* ((time (current-time))
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245 (s (current-time-string time)))
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246 (string-match "[^ ]+ +\\([^ ]+\\) +\\([^ ]+\\) \\([^ ]+\\) \\([^ ]+\\)" s)
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247 (concat (substring s (match-beginning 2) (match-end 2)) " "
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248 (substring s (match-beginning 1) (match-end 1)) " "
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249 (substring s (match-beginning 4) (match-end 4)) " "
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250 (substring s (match-beginning 3) (match-end 3)) " "
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251 (mail-rfc822-time-zone time))))
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252
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253 (provide 'mail-utils)
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254
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255 ;;; mail-utils.el ends here
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