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;;; ravanan --- High-reproducibility CWL runner powered by Guix
;;; Copyright © 2024 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of ravanan.
;;;
;;; ravanan 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.
;;;
;;; ravanan 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 ravanan. If not, see <https://www.gnu.org/licenses/>.
(define-module (ravanan utils)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:export (json-ref
call-with-temporary-file))
(define (json-ref scm . keys)
"Extract subtree of JSON @var{scm} that is addressed by @var{keys}."
(match keys
((key other-keys ...)
(apply json-ref
((if (list? scm) assoc-ref vector-ref) scm key)
other-keys))
(() scm)))
(define* (call-with-temporary-file proc #:optional (parent-directory (getcwd)))
"Call @var{proc} with an output port to a new temporary file in
@var{parent-directory}, and delete it when @var{proc} returns or exits
non-locally."
(let ((temporary-file-port (mkstemp (string-append parent-directory "/XXXXXX"))))
(dynamic-wind (const #t)
(cut proc temporary-file-port)
(lambda ()
(delete-file (port-filename temporary-file-port))))))
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