From: Thien-Thi Nguyen <ttn@surf.glug.org>
Cc: guile-user@gnu.org
Subject: fortune-cookie
Date: Tue, 15 Jun 2004 18:21:36 +0200 [thread overview]
Message-ID: <E1BaGgq-0000bV-00@surf.glug.org> (raw)
(use-modules (database binconv) (scripts slurp))
(define (fortune-cookie cookie-file)
(let* ((port (open-input-file (string-append cookie-file ".dat")))
(readw (let ((s (make-string 4)))
(lambda ()
(string-set! s 0 (read-char port))
(string-set! s 1 (read-char port))
(string-set! s 2 (read-char port))
(string-set! s 3 (read-char port))
(integer-byte-string->integer s #f #t)))))
(define (read-header)
(list (cons #:version (readw))
(cons #:count (readw))
(cons #:longest (readw))
(cons #:shortest (readw))
(cons #:flags (let* ((w (readw))
(chk (lambda (mask val)
(if (= 0 (logand mask w))
'()
(list val)))))
`(,@(chk #x1 #:random)
,@(chk #x2 #:ordered)
,@(chk #x4 #:rotated))))
(cons #:delim (read-char port))
(cons #:filler (list (read-char port)
(read-char port)
(read-char port)))))
;; do it!
(let* ((header (read-header))
(selection (random (assq-ref header #:count)))
(start (do ((i 0 (1+ i)))
((= i selection) (readw))
(readw)))
(finish (readw))
(len (- finish start 2))
(cookie (make-string len)))
(slurp-file! cookie cookie-file start len 0)
(display cookie))))
;;(set! *random-state* (seed->random-state (current-time)))
;;(fortune-cookie "lambda.txt") ; use strfile(1) to make lambda.txt.dat
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