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;;; cookie1.el --- retrieve random phrases from fortune cookie files
;; Copyright (C) 1993 Free Software Foundation, Inc.
;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
;; Maintainer: FSF
;; Keywords: games
;; Created: Mon Mar 22 17:06:26 1993
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; Support for random cookie fetches from phrase files, used for such
;; critical applications as emulating Zippy the Pinhead and confounding
;; the NSA Trunk Trawler.
;;
;; The two entry points are `cookie' and `cookie-insert'. The helper
;; function `shuffle-vector' may be of interest to programmers.
;;
;; The code expects phrase files to be in one of two formats:
;;
;; * ITS-style LINS format (strings terminated by ASCII 0 characters,
;; leading whitespace ignored).
;;
;; * UNIX fortune file format (quotes terminated by %% on a line by itself).
;;
;; Everything up to the first delimiter is treated as a comment. Other
;; formats could be supported by adding alternates to the regexp
;; `cookie-delimiter'.
;;
;; This code derives from Steve Strassman's 1987 spook.el package, but
;; has been generalized so that it supports multiple simultaneous
;; cookie databases and fortune files. It is intended to be called
;; from other packages such as yow.el and spook.el.
;;
;; TO DO: teach cookie-snarf to auto-detect ITS PINS or UNIX fortune(6)
;; format and do the right thing.
;;; Code:
; Randomize the seed in the random number generator.
(random t)
(defconst cookie-delimiter "\n%%\n\\|\0"
"Delimiter used to separate cookie file entries.")
(defvar cookie-cache (make-vector 511 0)
"Cache of cookie files that have already been snarfed.")
;;;###autoload
(defun cookie (phrase-file startmsg endmsg)
"Return a random phrase from PHRASE-FILE. When the phrase file
is read in, display STARTMSG at beginning of load, ENDMSG at end."
(let ((cookie-vector (cookie-snarf phrase-file startmsg endmsg)))
(shuffle-vector cookie-vector)
(aref cookie-vector 1)))
;;;###autoload
(defun cookie-insert (phrase-file &optional count startmsg endmsg)
"Insert random phrases from PHRASE-FILE; COUNT of them. When the phrase file
is read in, display STARTMSG at beginning of load, ENDMSG at end."
(let ((cookie-vector (cookie-snarf phrase-file startmsg endmsg)))
(shuffle-vector cookie-vector)
(let ((start (point)))
(insert ?\n)
(cookie1 (min (- (length cookie-vector) 1) (or count 1)) cookie-vector)
(insert ?\n)
(fill-region-as-paragraph start (point) nil))))
(defun cookie1 (arg cookie-vec)
"Inserts a cookie phrase ARG times."
(cond ((zerop arg) t)
(t (insert (aref cookie-vec arg))
(insert " ")
(cookie1 (1- arg) cookie-vec))))
;;;###autoload
(defun cookie-snarf (phrase-file startmsg endmsg)
"Reads in the PHRASE-FILE, returns it as a vector of strings.
Emit STARTMSG and ENDMSG before and after. Caches the result; second
and subsequent calls on the same file won't go to disk."
(let ((sym (intern-soft phrase-file cookie-cache)))
(and sym (not (equal (symbol-function sym)
(nth 5 (file-attributes phrase-file))))
(yes-or-no-p (concat phrase-file
" has changed. Read new contents? "))
(setq sym nil))
(if sym
(symbol-value sym)
(setq sym (intern phrase-file cookie-cache))
(message startmsg)
(save-excursion
(let ((buf (generate-new-buffer "*cookie*"))
(result nil))
(set-buffer buf)
(fset sym (nth 5 (file-attributes phrase-file)))
(insert-file-contents (expand-file-name phrase-file))
(re-search-forward cookie-delimiter)
(while (progn (skip-chars-forward " \t\n\r\f") (not (eobp)))
(let ((beg (point)))
(re-search-forward cookie-delimiter)
(setq result (cons (buffer-substring beg (1- (point)))
result))))
(kill-buffer buf)
(message endmsg)
(set sym (apply 'vector result)))))))
(defun read-cookie (prompt phrase-file startmsg endmsg &optional require-match)
"Prompt with PROMPT and read with completion among cookies in PHRASE-FILE.
STARTMSG and ENDMSG are passed along to `cookie-snarf'.
Optional fifth arg REQUIRE-MATCH non-nil forces a matching cookie."
;; Make sure the cookies are in the cache.
(or (intern-soft phrase-file cookie-cache)
(cookie-snarf phrase-file startmsg endmsg))
(completing-read prompt
(let ((sym (intern phrase-file cookie-cache)))
;; We cache the alist form of the cookie in a property.
(or (get sym 'completion-alist)
(let* ((alist nil)
(vec (cookie-snarf phrase-file
startmsg endmsg))
(i (length vec)))
(while (> (setq i (1- i)) 0)
(setq alist (cons (list (aref vec i)) alist)))
(put sym 'completion-alist alist))))
nil require-match nil nil))
; Thanks to Ian G Batten <BattenIG@CS.BHAM.AC.UK>
; [of the University of Birmingham Computer Science Department]
; for the iterative version of this shuffle.
;
;;;###autoload
(defun shuffle-vector (vector)
"Randomly permute the elements of VECTOR (all permutations equally likely)"
(let ((i 0)
j
temp
(len (length vector)))
(while (< i len)
(setq j (+ i (random (- len i))))
(setq temp (aref vector i))
(aset vector i (aref vector j))
(aset vector j temp)
(setq i (1+ i))))
vector)
(provide 'cookie1)
;;; cookie1.el ends here
|
