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Annotation of 43BSDReno/contrib/emacs-18.55/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 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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