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1.1 root 1: ;; Spook phrase utility
2: ;; Copyright (C) 1988 Free Software Foundation
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: ; Steve Strassmann ([email protected]) didn't write
23: ; this, and even if he did, he really didn't mean for you to use it
24: ; in an anarchistic way.
25: ; May 1987
26:
27: ; To use this:
28: ; Make sure you have the variable SPOOK-PHRASES-FILE pointing to
29: ; a valid phrase file. Phrase files are in the same format as
30: ; zippy's yow.lines (ITS-style LINS format).
31: ; Strings are terminated by ascii 0 characters. Leading whitespace ignored.
32: ; Everything up to the first \000 is a comment.
33: ;
34: ; Just before sending mail, do M-x spook.
35: ; A number of phrases will be inserted into your buffer, to help
36: ; give your message that extra bit of attractiveness for automated
37: ; keyword scanners.
38:
39: ; Variables
40: (defvar spook-phrases-file (concat exec-directory "spook.lines")
41: "Keep your favorite phrases here.")
42:
43: (defvar spook-phrase-default-count 15
44: "Default number of phrases to insert")
45:
46: (defvar spook-vector nil
47: "Important phrases for NSA mail-watchers")
48:
49: ; Randomize the seed in the random number generator.
50: (random t)
51:
52: ; Call this with M-x spook.
53: (defun spook ()
54: "Adds that special touch of class to your outgoing mail."
55: (interactive)
56: (if (null spook-vector)
57: (setq spook-vector (snarf-spooks)))
58: (shuffle-vector spook-vector)
59: (let ((start (point)))
60: (insert ?\n)
61: (spook1 (min (- (length spook-vector) 1) spook-phrase-default-count))
62: (insert ?\n)
63: (fill-region-as-paragraph start (point) nil)))
64:
65: (defun spook1 (arg)
66: "Inserts a spook phrase ARG times."
67: (cond ((zerop arg) t)
68: (t (insert (aref spook-vector arg))
69: (insert " ")
70: (spook1 (1- arg)))))
71:
72: (defun snarf-spooks ()
73: "Reads in the phrase file"
74: (message "Checking authorization...")
75: (save-excursion
76: (let ((buf (generate-new-buffer "*spook*"))
77: (result '()))
78: (set-buffer buf)
79: (insert-file-contents (expand-file-name spook-phrases-file))
80: (search-forward "\0")
81: (while (progn (skip-chars-forward " \t\n\r\f") (not (eobp)))
82: (let ((beg (point)))
83: (search-forward "\0")
84: (setq result (cons (buffer-substring beg (1- (point)))
85: result))))
86: (kill-buffer buf)
87: (message "Checking authorization... Approved.")
88: (setq spook-vector (apply 'vector result)))))
89:
90: (defun pick-random (n)
91: "Returns a random number from 0 to N-1 inclusive."
92: (% (logand 0777777 (random)) n))
93:
94: ; Thanks to Ian G Batten <[email protected]>
95: ; [of the University of Birmingham Computer Science Department]
96: ; for the iterative version of this shuffle.
97: ;
98: (defun shuffle-vector (vector)
99: "Randomly permute the elements of VECTOR (all permutations equally likely)"
100: (let ((i 0)
101: j
102: temp
103: (len (length vector)))
104: (while (< i len)
105: (setq j (+ i (pick-random (- len i))))
106: (setq temp (aref vector i))
107: (aset vector i (aref vector j))
108: (aset vector j temp)
109: (setq i (1+ i))))
110: vector)
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