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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 filesystem)
#:use-module (ice-9 match)
#:export (string-trim-prefix
call-with-temporary-file
load-script))
(define (string-trim-prefix prefix str)
"Remove @var{prefix} from @var{str} if it exists. Else, return @var{str} as is."
(if (string-prefix? prefix str)
(substring str (string-length prefix))
str))
(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))))))
(define* (load-script script-file #:key (modules '()))
"Load script from @var{script-file} and return its value. Import @var{modules}
before loading script."
;; We load the script file into a dummy module of its own so that any
;; definitions from there don't leak into this module. We also ensure that
;; this dummy module is different for different script files so that
;; definitions from one script file don't leak into other script files.
(let ((script-module
(resolve-module (match (file-name-split (canonicalize-file-name script-file))
(("" parts ...)
(map string->symbol parts))))))
;; Import modules required for loading script.
(for-each (lambda (module-name)
(module-use! script-module (resolve-interface module-name)))
modules)
(save-module-excursion
(lambda ()
(set-current-module script-module)
;; Do not auto-compile script file.
(set! %load-should-auto-compile #f)
;; Our use of load triggers a "Add #:declarative? #f to your
;; define-module invocation" warning during compilation. But, it is
;; probably safe to ignore this warning since we use load only within a
;; dummy module.
(load (canonicalize-path script-file))))))
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