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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)
#:export (print-hash-table
copy-hash-table
partial
partial-start
in-range
mean
flatten-sublists
more-than-one
hirestime))
(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 (partial f second-val)
(lambda (first-val)
(f first-val second-val)))
(define (partial-start f first-val)
(lambda args
(apply f first-val args)))
(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)
(define (listify a)
(if (list? a)
a
(list a)))
(fold (lambda (a prev)
(append prev (listify a)))
'() l))
(define (more-than-one a)
(if (nil? a)
#f
(not (nil? (cdr a)))))
(define (hirestime)
(let ((a (gettimeofday)))
(+ (car a)
(/ (cdr a)
1000000))))
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