lisp/mail/rmailsort.el

   1 ;;; rmailsort.el --- Rmail: sort messages
   2
   3 ;; Copyright (C) 1990, 1993, 1994, 2001, 2002, 2003, 2004,
   4 ;;   2005 Free Software Foundation, Inc.
   5
   6 ;; Author: Masanobu UMEDA <umerin@mse.kyutech.ac.jp>
   7 ;; Maintainer: FSF
   8 ;; Keywords: mail
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25 ;; Boston, MA 02110-1301, USA.
  26
  27 ;;; Commentary:
  28
  29 ;;; Code:
  30
  31 (require 'sort)
  32
  33 ;; For rmail-select-summary
  34 (require 'rmail)
  35
  36 (autoload 'timezone-make-date-sortable "timezone")
  37
  38 ;; Sorting messages in Rmail buffer
  39
  40 ;;;###autoload
  41 (defun rmail-sort-by-date (reverse)
  42   "Sort messages of current Rmail file by date.
  43 If prefix argument REVERSE is non-nil, sort them in reverse order."
  44   (interactive "P")
  45   (rmail-sort-messages reverse
  46                        (function
  47                         (lambda (msg)
  48                           (rmail-make-date-sortable
  49                            (rmail-fetch-field msg "Date"))))))
  50
  51 ;;;###autoload
  52 (defun rmail-sort-by-subject (reverse)
  53   "Sort messages of current Rmail file by subject.
  54 If prefix argument REVERSE is non-nil, sort them in reverse order."
  55   (interactive "P")
  56   (rmail-sort-messages reverse
  57                        (function
  58                         (lambda (msg)
  59                           (let ((key (or (rmail-fetch-field msg "Subject") ""))
  60                                 (case-fold-search t))
  61                             ;; Remove `Re:'
  62                             (if (string-match "^\\(re:[ \t]*\\)*" key)
  63                                 (substring key (match-end 0))
  64                               key))))))
  65
  66 ;;;###autoload
  67 (defun rmail-sort-by-author (reverse)
  68   "Sort messages of current Rmail file by author.
  69 If prefix argument REVERSE is non-nil, sort them in reverse order."
  70   (interactive "P")
  71   (rmail-sort-messages reverse
  72                        (function
  73                         (lambda (msg)
  74                           (downcase     ;Canonical name
  75                            (mail-strip-quoted-names
  76                             (or (rmail-fetch-field msg "From")
  77                                 (rmail-fetch-field msg "Sender") "")))))))
  78
  79 ;;;###autoload
  80 (defun rmail-sort-by-recipient (reverse)
  81   "Sort messages of current Rmail file by recipient.
  82 If prefix argument REVERSE is non-nil, sort them in reverse order."
  83   (interactive "P")
  84   (rmail-sort-messages reverse
  85                        (function
  86                         (lambda (msg)
  87                           (downcase     ;Canonical name
  88                            (mail-strip-quoted-names
  89                             (or (rmail-fetch-field msg "To")
  90                                 (rmail-fetch-field msg "Apparently-To") "")
  91                             ))))))
  92
  93 ;;;###autoload
  94 (defun rmail-sort-by-correspondent (reverse)
  95   "Sort messages of current Rmail file by other correspondent.
  96 If prefix argument REVERSE is non-nil, sort them in reverse order."
  97   (interactive "P")
  98   (rmail-sort-messages reverse
  99                        (function
 100                         (lambda (msg)
 101                           (rmail-select-correspondent
 102                            msg
 103                            '("From" "Sender" "To" "Apparently-To"))))))
 104
 105 (defun rmail-select-correspondent (msg fields)
 106   (let ((ans ""))
 107     (while (and fields (string= ans ""))
 108       (setq ans
 109             (rmail-dont-reply-to
 110              (mail-strip-quoted-names
 111               (or (rmail-fetch-field msg (car fields)) ""))))
 112       (setq fields (cdr fields)))
 113     ans))
 114
 115 ;;;###autoload
 116 (defun rmail-sort-by-lines (reverse)
 117   "Sort messages of current Rmail file by number of lines.
 118 If prefix argument REVERSE is non-nil, sort them in reverse order."
 119   (interactive "P")
 120   (rmail-sort-messages reverse
 121                        (function
 122                         (lambda (msg)
 123                           (count-lines (rmail-msgbeg msg)
 124                                        (rmail-msgend msg))))))
 125
 126 ;;;###autoload
 127 (defun rmail-sort-by-labels (reverse labels)
 128   "Sort messages of current Rmail file by labels.
 129 If prefix argument REVERSE is non-nil, sort them in reverse order.
 130 KEYWORDS is a comma-separated list of labels."
 131   (interactive "P\nsSort by labels: ")
 132   (or (string-match "[^ \t]" labels)
 133       (error "No labels specified"))
 134   (setq labels (concat (substring labels (match-beginning 0)) ","))
 135   (let (labelvec)
 136     (while (string-match "[ \t]*,[ \t]*" labels)
 137       (setq labelvec (cons
 138                       (concat ", ?\\("
 139                               (substring labels 0 (match-beginning 0))
 140                               "\\),")
 141                       labelvec))
 142       (setq labels (substring labels (match-end 0))))
 143     (setq labelvec (apply 'vector (nreverse labelvec)))
 144     (rmail-sort-messages reverse
 145                          (function
 146                           (lambda (msg)
 147                             (let ((n 0))
 148                               (while (and (< n (length labelvec))
 149                                           (not (rmail-message-labels-p
 150                                                 msg (aref labelvec n))))
 151                                 (setq n (1+ n)))
 152                               n))))))
 153 \f
 154 ;; Basic functions
 155
 156 (defun rmail-sort-messages (reverse keyfun)
 157   "Sort messages of current Rmail file.
 158 If 1st argument REVERSE is non-nil, sort them in reverse order.
 159 2nd argument KEYFUN is called with a message number, and should return a key."
 160   (save-current-buffer
 161     ;; If we are in a summary buffer, operate on the Rmail buffer.
 162     (if (eq major-mode 'rmail-summary-mode)
 163         (set-buffer rmail-buffer))
 164     (let ((buffer-read-only nil)
 165           (point-offset (- (point) (point-min)))
 166           (predicate nil)                       ;< or string-lessp
 167           (sort-lists nil))
 168       (message "Finding sort keys...")
 169       (widen)
 170       (let ((msgnum 1))
 171         (while (>= rmail-total-messages msgnum)
 172           (setq sort-lists
 173                 (cons (list (funcall keyfun msgnum) ;Make sorting key
 174                             (eq rmail-current-message msgnum) ;True if current
 175                             (aref rmail-message-vector msgnum)
 176                             (aref rmail-message-vector (1+ msgnum)))
 177                       sort-lists))
 178           (if (zerop (% msgnum 10))
 179               (message "Finding sort keys...%d" msgnum))
 180           (setq msgnum (1+ msgnum))))
 181       (or reverse (setq sort-lists (nreverse sort-lists)))
 182       ;; Decide predicate: < or string-lessp
 183       (if (numberp (car (car sort-lists))) ;Is a key numeric?
 184           (setq predicate (function <))
 185         (setq predicate (function string-lessp)))
 186       (setq sort-lists
 187             (sort sort-lists
 188                   (function
 189                    (lambda (a b)
 190                      (funcall predicate (car a) (car b))))))
 191       (if reverse (setq sort-lists (nreverse sort-lists)))
 192       ;; Now we enter critical region.  So, keyboard quit is disabled.
 193       (message "Reordering messages...")
 194       (let ((inhibit-quit t)            ;Inhibit quit
 195             (current-message nil)
 196             (msgnum 1)
 197             (msginfo nil))
 198         ;; There's little hope that we can easily undo after that.
 199         (buffer-disable-undo (current-buffer))
 200         (goto-char (rmail-msgbeg 1))
 201         ;; To force update of all markers.
 202         (insert-before-markers ?Z)
 203         (backward-char 1)
 204         ;; Now reorder messages.
 205         (while sort-lists
 206           (setq msginfo (car sort-lists))
 207           ;; Swap two messages.
 208           (insert-buffer-substring
 209            (current-buffer) (nth 2 msginfo) (nth 3 msginfo))
 210           (delete-region  (nth 2 msginfo) (nth 3 msginfo))
 211           ;; Is current message?
 212           (if (nth 1 msginfo)
 213               (setq current-message msgnum))
 214           (setq sort-lists (cdr sort-lists))
 215           (if (zerop (% msgnum 10))
 216               (message "Reordering messages...%d" msgnum))
 217           (setq msgnum (1+ msgnum)))
 218         ;; Delete the garbage inserted before.
 219         (delete-char 1)
 220         (setq quit-flag nil)
 221         (buffer-enable-undo)
 222         (rmail-set-message-counters)
 223         (rmail-show-message current-message)
 224         (goto-char (+ point-offset (point-min)))
 225         (if (rmail-summary-exists)
 226             (rmail-select-summary
 227              (rmail-update-summary)))))))
 228
 229 (defun rmail-fetch-field (msg field)
 230   "Return the value of the header FIELD of MSG.
 231 Arguments are MSG and FIELD."
 232   (save-restriction
 233     (widen)
 234     (let ((next (rmail-msgend msg)))
 235       (goto-char (rmail-msgbeg msg))
 236       (narrow-to-region (if (search-forward "\n*** EOOH ***\n" next t)
 237                             (point)
 238                           (forward-line 1)
 239                           (point))
 240                         (progn (search-forward "\n\n" nil t) (point)))
 241       (mail-fetch-field field))))
 242
 243 (defun rmail-make-date-sortable (date)
 244   "Make DATE sortable using the function string-lessp."
 245   ;; Assume the default time zone is GMT.
 246   (timezone-make-date-sortable date "GMT" "GMT"))
 247
 248 (provide 'rmailsort)
 249
 250 ;;; arch-tag: 0d90896b-0c35-46ac-b240-38be5ada2360
 251 ;;; rmailsort.el ends here