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1 ;;; dissociate.el --- scramble text amusingly for Emacs.
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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: games
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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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70
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21 ;; along with XEmacs; 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 ;;; Synched up with: FSF 19.28.
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26
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27 ;;; Commentary:
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28
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29 ;; The single entry point, `dissociated-press', applies a travesty
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30 ;; generator to the current buffer. The results can be quite amusing.
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31
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32 ;;; Code:
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33
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34 ;;;###autoload
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35 (defun dissociated-press (&optional arg)
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36 "Dissociate the text of the current buffer.
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37 Output goes in buffer named *Dissociation*,
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38 which is redisplayed each time text is added to it.
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39 Every so often the user must say whether to continue.
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40 If ARG is positive, require ARG chars of continuity.
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41 If ARG is negative, require -ARG words of continuity.
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42 Default is 2."
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43 (interactive "P")
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44 (setq arg (if arg (prefix-numeric-value arg) 2))
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45 (let* ((inbuf (current-buffer))
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46 (outbuf (get-buffer-create "*Dissociation*"))
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47 (move-function (if (> arg 0) 'forward-char 'forward-word))
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48 (move-amount (if (> arg 0) arg (- arg)))
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49 (search-function (if (> arg 0) 'search-forward 'word-search-forward))
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50 (last-query-point 0))
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51 (if (= (point-max) (point-min))
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52 (error "The buffer contains no text to start from"))
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53 (switch-to-buffer outbuf)
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54 (erase-buffer)
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55 (while
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56 (save-excursion
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57 (goto-char last-query-point)
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58 (vertical-motion (- (window-height) 4))
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59 (or (= (point) (point-max))
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60 (and (progn (goto-char (point-max))
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61 (y-or-n-p "Continue dissociation? "))
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62 (progn
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63 (message "")
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64 (recenter 1)
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65 (setq last-query-point (point-max))
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66 t))))
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67 (let (start end)
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68 (save-excursion
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69 (set-buffer inbuf)
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70 (setq start (point))
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71 (if (eq move-function 'forward-char)
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72 (progn
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73 (setq end (+ start (+ move-amount (random 16))))
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74 (if (> end (point-max))
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75 (setq end (+ 1 move-amount (random 16))))
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76 (goto-char end))
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77 (funcall move-function
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78 (+ move-amount (random 16))))
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79 (setq end (point)))
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80 (let ((opoint (point)))
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81 (insert-buffer-substring inbuf start end)
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82 (save-excursion
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83 (goto-char opoint)
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84 (end-of-line)
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85 (and (> (current-column) fill-column)
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86 (do-auto-fill)))))
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87 (save-excursion
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88 (set-buffer inbuf)
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89 (if (eobp)
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90 (goto-char (point-min))
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91 (let ((overlap
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92 (buffer-substring (prog1 (point)
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93 (funcall move-function
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94 (- move-amount)))
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95 (point))))
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96 (goto-char (1+ (random (1- (point-max)))))
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97 (or (funcall search-function overlap nil t)
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98 (let ((opoint (point)))
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99 (goto-char 1)
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100 (funcall search-function overlap opoint t))))))
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101 (sit-for 0))))
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102
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103 ;;; dissociate.el ends here
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