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Annotation of GNUtools/emacs/lisp/spook.el, revision 1.1.1.1

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 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 ([email protected]) 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 <[email protected]>
                     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)

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