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a2535589 JA |
1 | ;; Spook phrase utility |
2 | ;; Copyright (C) 1988 Free Software Foundation, Inc. | |
3 | ||
4 | ;; This file is part of GNU Emacs. | |
5 | ||
6 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
7 | ;; it under the terms of the GNU General Public License as published by | |
8 | ;; the Free Software Foundation; either version 1, or (at your option) | |
9 | ;; any later version. | |
10 | ||
11 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
12 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;; GNU General Public License for more details. | |
15 | ||
16 | ;; You should have received a copy of the GNU General Public License | |
17 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
18 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | ||
20 | ||
21 | ; Steve Strassmann (straz@media-lab.media.mit.edu) didn't write | |
22 | ; this, and even if he did, he really didn't mean for you to use it | |
23 | ; in an anarchistic way. | |
24 | ; May 1987 | |
25 | ||
26 | ; To use this: | |
27 | ; Make sure you have the variable SPOOK-PHRASES-FILE pointing to | |
28 | ; a valid phrase file. Phrase files are in the same format as | |
29 | ; zippy's yow.lines (ITS-style LINS format). | |
30 | ; Strings are terminated by ascii 0 characters. Leading whitespace ignored. | |
31 | ; Everything up to the first \000 is a comment. | |
32 | ; | |
33 | ; Just before sending mail, do M-x spook. | |
34 | ; A number of phrases will be inserted into your buffer, to help | |
35 | ; give your message that extra bit of attractiveness for automated | |
36 | ; keyword scanners. | |
37 | ||
38 | ; Variables | |
39 | (defvar spook-phrases-file (concat exec-directory "spook.lines") | |
40 | "Keep your favorite phrases here.") | |
41 | ||
42 | (defvar spook-phrase-default-count 15 | |
43 | "Default number of phrases to insert") | |
44 | ||
45 | (defvar spook-vector nil | |
46 | "Important phrases for NSA mail-watchers") | |
47 | ||
48 | ; Randomize the seed in the random number generator. | |
49 | (random t) | |
50 | ||
51 | ; Call this with M-x spook. | |
52 | (defun spook () | |
53 | "Adds that special touch of class to your outgoing mail." | |
54 | (interactive) | |
55 | (if (null spook-vector) | |
56 | (setq spook-vector (snarf-spooks))) | |
57 | (shuffle-vector spook-vector) | |
58 | (let ((start (point))) | |
59 | (insert ?\n) | |
60 | (spook1 (min (- (length spook-vector) 1) spook-phrase-default-count)) | |
61 | (insert ?\n) | |
62 | (fill-region-as-paragraph start (point) nil))) | |
63 | ||
64 | (defun spook1 (arg) | |
65 | "Inserts a spook phrase ARG times." | |
66 | (cond ((zerop arg) t) | |
67 | (t (insert (aref spook-vector arg)) | |
68 | (insert " ") | |
69 | (spook1 (1- arg))))) | |
70 | ||
71 | (defun snarf-spooks () | |
72 | "Reads in the phrase file" | |
73 | (message "Checking authorization...") | |
74 | (save-excursion | |
75 | (let ((buf (generate-new-buffer "*spook*")) | |
76 | (result '())) | |
77 | (set-buffer buf) | |
78 | (insert-file-contents (expand-file-name spook-phrases-file)) | |
79 | (search-forward "\0") | |
80 | (while (progn (skip-chars-forward " \t\n\r\f") (not (eobp))) | |
81 | (let ((beg (point))) | |
82 | (search-forward "\0") | |
83 | (setq result (cons (buffer-substring beg (1- (point))) | |
84 | result)))) | |
85 | (kill-buffer buf) | |
86 | (message "Checking authorization... Approved.") | |
87 | (setq spook-vector (apply 'vector result))))) | |
88 | ||
89 | (defun pick-random (n) | |
90 | "Returns a random number from 0 to N-1 inclusive." | |
91 | (% (logand 0777777 (random)) n)) | |
92 | ||
93 | ; Thanks to Ian G Batten <BattenIG@CS.BHAM.AC.UK> | |
94 | ; [of the University of Birmingham Computer Science Department] | |
95 | ; for the iterative version of this shuffle. | |
96 | ; | |
97 | (defun shuffle-vector (vector) | |
98 | "Randomly permute the elements of VECTOR (all permutations equally likely)" | |
99 | (let ((i 0) | |
100 | j | |
101 | temp | |
102 | (len (length vector))) | |
103 | (while (< i len) | |
104 | (setq j (+ i (pick-random (- len i)))) | |
105 | (setq temp (aref vector i)) | |
106 | (aset vector i (aref vector j)) | |
107 | (aset vector j temp) | |
108 | (setq i (1+ i)))) | |
109 | vector) |