Add simple formatting module.

src/util-format.scm

@@ -0,0 +1,53 @@
+;;
+;; 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 integer?
+	     (format "~A.--" (car flds))
+	     (format "~A.~A"
+		     (car flds)
+		     (substring
+		      (string-append (cadr flds) "0")
+		      0 2))))
+       "ERR.OR"))
+
+ )