mirror of https://notabug.org/mthl/cuirass.git
62 lines
2.2 KiB
Scheme
62 lines
2.2 KiB
Scheme
;;;; base.scm - Cuirass base module
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;;;
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;;; Copyright © 2012, 2016 Ludovic Courtès <ludo@gnu.org>
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;;;
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;;; This file is part of Cuirass.
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;;;
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;;; Cuirass is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; Cuirass is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Cuirass. If not, see <http://www.gnu.org/licenses/>.
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(define-module (cuirass base)
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#:use-module (ice-9 format)
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#:use-module (srfi srfi-19)
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#:export (guix-variable
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with-directory-excursion
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call-with-time-display))
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(define (guix-variable module name)
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"Dynamically link variable NAME under Guix module MODULE and return it.
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Note: this is used instead of `@', because when using `@' in an uncompiled
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file, Guile tries to load the module directly as it reads the source, which
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fails in our case, leading to the creation of empty (guix ...) modules."
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(let ((m (resolve-interface `(guix ,module))))
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(module-ref m name)))
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(define-syntax-rule (with-directory-excursion dir body ...)
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"Run BODY with DIR as the process's current directory."
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(let ((init (getcwd)))
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(dynamic-wind
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(lambda ()
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(chdir dir))
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(lambda ()
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body ...)
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(lambda ()
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(chdir init)))))
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(define (call-with-time thunk kont)
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"Call THUNK and pass KONT the elapsed time followed by THUNK's return
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values."
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(let* ((start (current-time time-monotonic))
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(result (call-with-values thunk list))
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(end (current-time time-monotonic)))
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(apply kont (time-difference end start) result)))
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(define (call-with-time-display thunk)
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"Call THUNK and write to the current output port its duration."
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(call-with-time thunk
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(lambda (time . results)
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(format #t "~,3f seconds~%"
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(+ (time-second time)
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(/ (time-nanosecond time) 1e9)))
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(apply values results))))
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