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(define-module (hnh util uuid)
:use-module (ice-9 format)
:export (seed uuid uuid-v4))
(define seed (make-parameter (random-state-from-platform)))
(define (uuid-v4)
(define version 4)
(define variant #b10)
(format #f "~8'0x-~4'0x-~4'0x-~4'0x-~12'0x"
(random (ash 1 (* 4 8)) (seed))
(random (ash 1 (* 4 4)) (seed))
(logior (ash version (* 4 3))
(random (1- (ash 1 (* 4 3))) (seed)))
(logior (ash variant (+ 2 (* 4 3)))
(random (ash 1 (+ 2 (* 4 3))) (seed)))
(random (ash 1 (* 4 12)) (seed))))
(define uuid uuid-v4)
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