94 lines
3.1 KiB
Scheme
94 lines
3.1 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
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;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
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;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix 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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;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix shell-utils)
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#:use-module (ice-9 match)
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#:use-module (rnrs bytevectors)
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#:use-module (rnrs io ports)
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#:export (dump-port
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mkdir-p
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with-directory-excursion))
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;;;
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;;; Directories.
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;;;
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(define (mkdir-p dir)
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"Create directory DIR and all its ancestors."
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(define absolute?
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(string-prefix? "/" dir))
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(define not-slash
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(char-set-complement (char-set #\/)))
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(let loop ((components (string-tokenize dir not-slash))
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(root (if absolute?
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""
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".")))
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(match components
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((head tail ...)
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(let ((path (string-append root "/" head)))
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(catch 'system-error
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(lambda ()
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(mkdir path)
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(loop tail path))
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(lambda args
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(if (= EEXIST (system-error-errno args))
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(loop tail path)
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(apply throw args))))))
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(() #t))))
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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* (dump-port in out
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#:key (buffer-size 16384)
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(progress (lambda (t k) (k))))
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"Read as much data as possible from IN and write it to OUT, using chunks of
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BUFFER-SIZE bytes. Call PROGRESS at the beginning and after each successful
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transfer of BUFFER-SIZE bytes or less, passing it the total number of bytes
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transferred and the continuation of the transfer as a thunk."
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(define buffer
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(make-bytevector buffer-size))
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(define (loop total bytes)
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(or (eof-object? bytes)
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(let ((total (+ total bytes)))
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(put-bytevector out buffer 0 bytes)
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(progress total
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(lambda ()
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(loop total
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(get-bytevector-n! in buffer 0 buffer-size)))))))
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;; Make sure PROGRESS is called when we start so that it can measure
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;; throughput.
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(progress 0
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(lambda ()
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(loop 0 (get-bytevector-n! in buffer 0 buffer-size)))))
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