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;;
;; starlet/utils.scm
;;
;; Copyright © 2020-2021 Thomas White <taw@bitwiz.org.uk>
;;
;; This file is part of Starlet.
;;
;; Starlet is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;
(define-module (starlet utils)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-8)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 control)
#:export (print-hash-table
copy-hash-table
in-range
mean
flatten-sublists
more-than-one
hirestime
lsb
msb
ensure-number
round-dmx
scale-to-range
scale-and-clamp-to-range
percent->dmxval8
percent->dmxval16
comment
hash-table-empty?
lookup
add-and-run-hook!
cat-with-spaces
next-item-in-list))
(define (print-hash-table ht)
(hash-for-each (lambda (key value)
(display key)
(display " ---> ")
(display value)
(newline))
ht))
(define (copy-hash-table ht)
(let ((new-ht (make-hash-table)))
(hash-for-each (lambda (key value)
(hash-set! new-ht key value))
ht)
new-ht))
(define (in-range a val1 val2)
(or
(and (>= a val1)
(<= a val2))
(and (>= a val2)
(<= a val1))))
(define (mean vals)
(/ (fold + 0 vals)
(length vals)))
(define (flatten-sublists l)
(fold
(lambda (el prev)
(if (list? el)
(append (flatten-sublists el) prev)
(cons el prev)))
'() l))
(define (more-than-one a)
(if (nil? a)
#f
(not (nil? (cdr a)))))
(define (hirestime)
(let ((a (gettimeofday)))
(+ (car a)
(/ (cdr a)
1000000))))
(define (msb val)
(round-dmx (euclidean-quotient val 256)))
(define (lsb val)
(round-dmx (euclidean-remainder val 256)))
(define (round-dmx a)
(inexact->exact
(min 255 (max 0 (round a)))))
(define (ensure-number value irritating)
(unless (number? value)
(raise-exception (make-exception
(make-exception-with-message "Value is not a number")
(make-exception-with-irritants irritating)))))
(define (percent->dmxval8 val)
(round-dmx
(scale-to-range val '(0 100) '(0 255))))
(define (percent->dmxval16 val)
(scale-to-range val '(0 100) '(0 65535)))
(define (scale-to-range val orig-range dest-range)
(define (range r)
(- (cadr r) (car r)))
(+ (car dest-range)
(* (range dest-range)
(/ (- val (car orig-range))
(range orig-range)))))
(define (clamp-to-range val val1 val2)
(let ((minval (min val1 val2))
(maxval (max val1 val2)))
(max minval
(min val maxval))))
;; Like scale-to-range, but result is clamped within dest-range
(define (scale-and-clamp-to-range val orig-range dest-range)
(clamp-to-range
(scale-to-range val orig-range dest-range)
(car dest-range)
(cadr dest-range)))
(define-syntax comment
(syntax-rules ()
((_ body ...)
#f)))
(define (hash-table-empty? ht)
(let/ec
return
(hash-for-each-handle
(lambda (key)
(return #f))
ht)
#t))
(define (lookup key dictionary)
(cond
((nil? dictionary)
#f)
((eq? key (caar dictionary))
(cadr (car dictionary)))
(else
(lookup key (cdr dictionary)))))
(define (add-and-run-hook! hook proc . initial-args)
(add-hook! hook proc)
(apply proc initial-args))
(define (cat-with-spaces lst)
(reduce
(lambda (b a)
(string-append a " " b))
"" lst))
(define (next-item-in-list the-list cval)
(let ((sl (memq cval the-list)))
(if (nil? (cdr sl))
(first the-list)
(second sl))))
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