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;;; spook.el --- spook phrase utility for overloading the NSA line eater
;; Copyright (C) 1988 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: games
;; Created: May 1987
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
; Steve Strassmann (straz@media-lab.media.mit.edu) didn't write
; this, and even if he did, he really didn't mean for you to use it
; in an anarchistic way.
;
; To use this:
; Make sure you have the variable SPOOK-PHRASES-FILE pointing to
; a valid phrase file. Phrase files are in the same format as
; zippy's yow.lines (ITS-style LINS format).
; Strings are terminated by ascii 0 characters. Leading whitespace ignored.
; Everything up to the first \000 is a comment.
;
; Just before sending mail, do M-x spook.
; A number of phrases will be inserted into your buffer, to help
; give your message that extra bit of attractiveness for automated
; keyword scanners. Help defeat the NSA trunk trawler!
;;; Code:
; Variables
(defvar spook-phrases-file (concat data-directory "spook.lines")
"Keep your favorite phrases here.")
(defvar spook-phrase-default-count 15
"Default number of phrases to insert")
(defvar spook-vector nil
"Important phrases for NSA mail-watchers")
; Randomize the seed in the random number generator.
(random t)
; Call this with M-x spook.
;;;###autoload
(defun spook ()
"Adds that special touch of class to your outgoing mail."
(interactive)
(if (null spook-vector)
(setq spook-vector (snarf-spooks)))
(shuffle-vector spook-vector)
(let ((start (point)))
(insert ?\n)
(spook1 (min (- (length spook-vector) 1) spook-phrase-default-count))
(insert ?\n)
(fill-region-as-paragraph start (point) nil)))
(defun spook1 (arg)
"Inserts a spook phrase ARG times."
(cond ((zerop arg) t)
(t (insert (aref spook-vector arg))
(insert " ")
(spook1 (1- arg)))))
(defun snarf-spooks ()
"Reads in the phrase file"
(message "Checking authorization...")
(save-excursion
(let ((buf (generate-new-buffer "*spook*"))
(result '()))
(set-buffer buf)
(insert-file-contents (expand-file-name spook-phrases-file))
(search-forward "\0")
(while (progn (skip-chars-forward " \t\n\r\f") (not (eobp)))
(let ((beg (point)))
(search-forward "\0")
(setq result (cons (buffer-substring beg (1- (point)))
result))))
(kill-buffer buf)
(message "Checking authorization... Approved.")
(setq spook-vector (apply 'vector result)))))
(defun pick-random (n)
"Returns a random number from 0 to N-1 inclusive."
(% (logand 0777777 (random)) n))
; Thanks to Ian G Batten <BattenIG@CS.BHAM.AC.UK>
; [of the University of Birmingham Computer Science Department]
; for the iterative version of this shuffle.
;
(defun shuffle-vector (vector)
"Randomly permute the elements of VECTOR (all permutations equally likely)"
(let ((i 0)
j
temp
(len (length vector)))
(while (< i len)
(setq j (+ i (pick-random (- len i))))
(setq temp (aref vector i))
(aset vector i (aref vector j))
(aset vector j temp)
(setq i (1+ i))))
vector)
;;; spook.el ends here
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