;;
;; util-time.scm
;;
;; Compatibility module for 5.2- vs 5.3+ chicken versions.
;;
;; ISC License
;;
;; Copyright 2023 Brmlab, z.s.
;; Dominik Pantůček <dominik.pantucek@trustica.cz>
;;
;; Permission to use, copy, modify, and/or distribute this software
;; for any purpose with or without fee is hereby granted, provided
;; that the above copyright notice and this permission notice appear
;; in all copies.
;; 
;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
;;

(declare (unit util-time))

(module
 util-time
 (
  current-util-milliseconds
  today/iso
  )

 (import scheme
	 (chicken time)
	 (chicken time posix)
	 (chicken format))

 ;; Compatibility wrapper
 (define (current-util-milliseconds)
   (cond-expand
    (chicken-5.0
     (current-milliseconds))
    (chicken-5.1
     (current-milliseconds))
    (chicken-5.2
     (current-milliseconds))
    (else
     (current-process-milliseconds))))

 ;; Returns today as YYYY-MM-DD string
 (define (today/iso)
   (let ((d (seconds->local-time)))
     (format "~A-~A-~A"
	     (number->string
	      (+ 1900 (vector-ref d 5)))
	     (substring
	      (number->string
	       (+ 101 (vector-ref d 4)))
	      1)
	     (substring
	      (number->string
	       (+ 100 (vector-ref d 3)))
	      1))))

 )