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Annotation of 43BSD/contrib/emacs/lisp/dissociate.el, revision 1.1.1.1

1.1       root        1: ;; Scramble text amusingly for Emacs.
                      2: ;; Copyright (C) 1985 Richard M. Stallman.
                      3: 
                      4: ;; This file is part of GNU Emacs.
                      5: 
                      6: ;; GNU Emacs is distributed in the hope that it will be useful,
                      7: ;; but WITHOUT ANY WARRANTY.  No author or distributor
                      8: ;; accepts responsibility to anyone for the consequences of using it
                      9: ;; or for whether it serves any particular purpose or works at all,
                     10: ;; unless he says so in writing.  Refer to the GNU Emacs General Public
                     11: ;; License for full details.
                     12: 
                     13: ;; Everyone is granted permission to copy, modify and redistribute
                     14: ;; GNU Emacs, but only under the conditions described in the
                     15: ;; GNU Emacs General Public License.   A copy of this license is
                     16: ;; supposed to have been given to you along with GNU Emacs so you
                     17: ;; can know your rights and responsibilities.  It should be in a
                     18: ;; file named COPYING.  Among other things, the copyright notice
                     19: ;; and this notice must be preserved on all copies.
                     20: 
                     21: 
                     22: (defun dissociated-press (&optional arg)
                     23:   "Dissociate the text of the current buffer.
                     24: Output goes in buffer named *Dissociation*,
                     25: which is redisplayed each time text is added to it.
                     26: Every so often the user must say whether to continue.
                     27: If ARG is positive, require ARG chars of continuity.
                     28: If ARG is negative, require -ARG words of continuity.
                     29: Default is 2."
                     30:   (interactive "P")
                     31:   (setq arg (if arg (prefix-numeric-value arg) 2))
                     32:   (let* ((inbuf (current-buffer))
                     33:         (outbuf (get-buffer-create "*Dissociation*"))
                     34:         (move-function (if (> arg 0) 'forward-char 'forward-word))
                     35:         (move-amount (if (> arg 0) arg (- arg)))
                     36:         (search-function (if (> arg 0) 'search-forward 'word-search-forward))
                     37:         (last-query-point 0))
                     38:     (switch-to-buffer outbuf)
                     39:     (erase-buffer)
                     40:     (while
                     41:       (save-excursion
                     42:        (goto-char last-query-point)
                     43:        (vertical-motion (- (window-height) 4))
                     44:        (or (= (point) (point-max))
                     45:            (and (progn (goto-char (point-max))
                     46:                        (y-or-n-p "Continue dissociation? "))
                     47:                 (progn
                     48:                   (message "")
                     49:                   (recenter 1)
                     50:                   (setq last-query-point (point-max))
                     51:                   t))))
                     52:       (let (start end)
                     53:        (save-excursion
                     54:         (set-buffer inbuf)
                     55:         (setq start (point))
                     56:         (if (eq move-function 'forward-char)
                     57:             (progn
                     58:               (setq end (+ start (+ move-amount (logand 15 (random)))))
                     59:               (if (> end (point-max))
                     60:                   (setq end (+ 1 move-amount (logand 15 (random)))))
                     61:               (goto-char end))
                     62:           (funcall move-function
                     63:                    (+ move-amount (logand 15 (random)))))
                     64:         (setq end (point)))
                     65:        (let ((opoint (point)))
                     66:          (insert-buffer-substring inbuf start end)
                     67:          (save-excursion
                     68:           (goto-char opoint)
                     69:           (end-of-line)
                     70:           (and (> (current-column) fill-column)
                     71:                (do-auto-fill)))))
                     72:       (save-excursion
                     73:        (set-buffer inbuf)
                     74:        (if (eobp)
                     75:           (goto-char (point-min))
                     76:         (let ((overlap
                     77:                (buffer-substring (prog1 (point)
                     78:                                         (funcall move-function
                     79:                                                  (- move-amount)))
                     80:                                  (point))))
                     81:           (let (ranval)
                     82:             (while (< (setq ranval (random)) 0))
                     83:             (goto-char (1+ (% ranval (1- (point-max))))))
                     84:           (or (funcall search-function overlap nil t)
                     85:               (let ((opoint (point)))
                     86:                 (goto-char 1)
                     87:                 (funcall search-function overlap opoint t))))))
                     88:       (sit-for 0))))

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