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+;; Spook phrase utility
+;; Copyright (C) 1988 Free Software Foundation
+
+;; 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 1, 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.
+
+
+; 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.
+; May 1987
+
+; 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.
+
+; Variables
+(defvar spook-phrases-file (concat exec-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.
+(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)