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