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1 ;;; rmailsort.el --- Rmail: sort messages.
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2
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3 ;; Copyright (C) 1990, 1993 Free Software Foundation, Inc.
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4
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5 ;; Author: Masanobu UMEDA <umerin@mse.kyutech.ac.jp>
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6 ;; Version: !Header: /home/fsf/rms/e19/lisp/RCS/rmailsort.el,v 1.16 1993/11/24 08:08:56 rms Exp !
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7 ;; Keywords: mail
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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23 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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24
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25 ;;; Code:
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26
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27 (require 'sort)
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28
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29 (autoload 'timezone-make-date-sortable "timezone")
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30
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31 ;; Sorting messages in Rmail buffer
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32
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33 (defun rmail-sort-by-date (reverse)
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34 "Sort messages of current Rmail file by date.
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35 If prefix argument REVERSE is non-nil, sort them in reverse order."
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36 (interactive "P")
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37 (rmail-sort-messages reverse
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38 (function
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39 (lambda (msg)
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40 (rmail-make-date-sortable
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41 (rmail-fetch-field msg "Date"))))))
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42
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43 (defun rmail-sort-by-subject (reverse)
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44 "Sort messages of current Rmail file by subject.
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45 If prefix argument REVERSE is non-nil, sort them in reverse order."
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46 (interactive "P")
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47 (rmail-sort-messages reverse
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48 (function
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49 (lambda (msg)
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50 (let ((key (or (rmail-fetch-field msg "Subject") ""))
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51 (case-fold-search t))
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52 ;; Remove `Re:'
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53 (if (string-match "^\\(re:[ \t]+\\)*" key)
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54 (substring key (match-end 0)) key))))))
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55
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56 (defun rmail-sort-by-author (reverse)
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57 "Sort messages of current Rmail file by author.
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58 If prefix argument REVERSE is non-nil, sort them in reverse order."
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59 (interactive "P")
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60 (rmail-sort-messages reverse
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61 (function
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62 (lambda (msg)
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63 (downcase ;Canonical name
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64 (mail-strip-quoted-names
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65 (or (rmail-fetch-field msg "From")
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66 (rmail-fetch-field msg "Sender") "")))))))
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67
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68 (defun rmail-sort-by-recipient (reverse)
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69 "Sort messages of current Rmail file by recipient.
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70 If prefix argument REVERSE is non-nil, sort them in reverse order."
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71 (interactive "P")
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72 (rmail-sort-messages reverse
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73 (function
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74 (lambda (msg)
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75 (downcase ;Canonical name
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76 (mail-strip-quoted-names
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77 (or (rmail-fetch-field msg "To")
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78 (rmail-fetch-field msg "Apparently-To") "")
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79 ))))))
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80
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81 (defun rmail-sort-by-correspondent (reverse)
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82 "Sort messages of current Rmail file by other correspondent.
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83 If prefix argument REVERSE is non-nil, sort them in reverse order."
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84 (interactive "P")
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85 (rmail-sort-messages reverse
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86 (function
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87 (lambda (msg)
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88 (rmail-select-correspondent
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89 msg
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90 '("From" "Sender" "To" "Apparently-To"))))))
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91
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92 (defun rmail-select-correspondent (msg fields)
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93 (let ((ans ""))
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94 (while (and fields (string= ans ""))
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95 (setq ans
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96 (rmail-dont-reply-to
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97 (mail-strip-quoted-names
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98 (or (rmail-fetch-field msg (car fields)) ""))))
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99 (setq fields (cdr fields)))
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100 ans))
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101
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102 (defun rmail-sort-by-lines (reverse)
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103 "Sort messages of current Rmail file by number of lines.
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104 If prefix argument REVERSE is non-nil, sort them in reverse order."
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105 (interactive "P")
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106 (rmail-sort-messages reverse
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107 (function
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108 (lambda (msg)
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109 (count-lines (rmail-msgbeg msgnum)
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110 (rmail-msgend msgnum))))))
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111
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112 ;; Basic functions
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113
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114 (defun rmail-sort-messages (reverse keyfun)
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115 "Sort messages of current Rmail file.
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116 If 1st argument REVERSE is non-nil, sort them in reverse order.
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117 2nd argument KEYFUN is called with a message number, and should return a key."
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118 (save-excursion
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119 ;; If we are in a summary buffer, operate on the Rmail buffer.
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120 (if (eq major-mode 'rmail-summary-mode)
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121 (set-buffer rmail-buffer))
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122 (let ((buffer-read-only nil)
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123 (predicate nil) ;< or string-lessp
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124 (sort-lists nil))
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125 (message "Finding sort keys...")
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126 (widen)
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127 (let ((msgnum 1))
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128 (while (>= rmail-total-messages msgnum)
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129 (setq sort-lists
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130 (cons (list (funcall keyfun msgnum) ;Make sorting key
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131 (eq rmail-current-message msgnum) ;True if current
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132 (aref rmail-message-vector msgnum)
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133 (aref rmail-message-vector (1+ msgnum)))
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134 sort-lists))
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135 (if (zerop (% msgnum 10))
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136 (message "Finding sort keys...%d" msgnum))
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137 (setq msgnum (1+ msgnum))))
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138 (or reverse (setq sort-lists (nreverse sort-lists)))
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139 ;; Decide predicate: < or string-lessp
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140 (if (numberp (car (car sort-lists))) ;Is a key numeric?
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141 (setq predicate (function <))
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142 (setq predicate (function string-lessp)))
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143 (setq sort-lists
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144 (sort sort-lists
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145 (function
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146 (lambda (a b)
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147 (funcall predicate (car a) (car b))))))
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148 (if reverse (setq sort-lists (nreverse sort-lists)))
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149 ;; Now we enter critical region. So, keyboard quit is disabled.
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150 (message "Reordering messages...")
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151 (let ((inhibit-quit t) ;Inhibit quit
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152 (current-message nil)
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153 (msgnum 1)
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154 (msginfo nil))
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155 ;; There's little hope that we can easily undo after that.
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156 (buffer-disable-undo (current-buffer))
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157 (goto-char (rmail-msgbeg 1))
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158 ;; To force update of all markers.
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159 (insert-before-markers ?Z)
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160 (backward-char 1)
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161 ;; Now reorder messages.
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162 (while sort-lists
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163 (setq msginfo (car sort-lists))
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164 ;; Swap two messages.
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165 (insert-buffer-substring
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166 (current-buffer) (nth 2 msginfo) (nth 3 msginfo))
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167 (delete-region (nth 2 msginfo) (nth 3 msginfo))
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168 ;; Is current message?
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169 (if (nth 1 msginfo)
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170 (setq current-message msgnum))
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171 (setq sort-lists (cdr sort-lists))
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172 (if (zerop (% msgnum 10))
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173 (message "Reordering messages...%d" msgnum))
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174 (setq msgnum (1+ msgnum)))
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175 ;; Delete the garbage inserted before.
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176 (delete-char 1)
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177 (setq quit-flag nil)
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178 (buffer-enable-undo)
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179 (rmail-set-message-counters)
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180 (rmail-show-message current-message)))))
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181
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182 (defun rmail-fetch-field (msg field)
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183 "Return the value of the header FIELD of MSG.
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184 Arguments are MSG and FIELD."
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185 (save-restriction
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186 (widen)
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187 (let ((next (rmail-msgend msg)))
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188 (goto-char (rmail-msgbeg msg))
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189 (narrow-to-region (if (search-forward "\n*** EOOH ***\n" next t)
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190 (point)
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191 (forward-line 1)
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192 (point))
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193 (progn (search-forward "\n\n" nil t) (point)))
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194 (mail-fetch-field field))))
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195
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196 (defun rmail-make-date-sortable (date)
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197 "Make DATE sortable using the function string-lessp."
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198 ;; Assume the default time zone is GMT.
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199 (timezone-make-date-sortable date "GMT" "GMT"))
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200
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201 (provide 'rmailsort)
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202
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203 ;;; rmailsort.el ends here
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