;;
;; util-format.scm
;;
;; Less-common formatting functions.
;;
;; 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-format))

(module
 util-format
 (
  format-amount
  )

 (import scheme
	 (chicken string)
	 (chicken format))

 ;; Formats amount in currency
 (define (format-amount amt)
   (if amt
       (let* ((str (number->string amt))
	      (flds (string-split str "."))
	      (integer? (null? (cdr flds))))
	 (if (or integer?
		 (string=? (cadr flds) "0"))
	     (format "~A.--" (car flds))
	     (format "~A.~A"
		     (car flds)
		     (substring
		      (string-append (cadr flds) "0")
		      0 2))))
       "ERR.OR"))

 )