67 lines
2.4 KiB
Scheme
67 lines
2.4 KiB
Scheme
;;; Gash --- Guile As SHell
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;;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; This file is part of Gash.
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;;;
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;;; Gash 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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;;; Gash 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 Gash. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gash tar)
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#:use-module (ice-9 getopt-long)
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#:use-module (gash config)
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#:use-module (gash ustar)
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#:export (main))
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(define (parse-opts args)
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(let* ((option-spec
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'((create (single-char #\c))
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(extract (single-char #\x))
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(file (single-char #\f) (value #t))
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(help (single-char #\h))
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(version (single-char #\V))))
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(options (getopt-long args option-spec))
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(create? (option-ref options 'create #f))
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(extract? (option-ref options 'extract #f))
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(help? (option-ref options 'help #f))
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(files (option-ref options '() '()))
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(usage? (and (not help?) (not (or (and create? (pair? files)) extract?))))
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(version? (option-ref options 'version #f)))
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(or
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(and version?
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(format #t "tar (GASH) ~a\n" %version)
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(exit 0))
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(and (or help? usage?)
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(format (or (and usage? (current-error-port)) (current-output-port))
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(string-append "\
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Usage: tar [OPTION]... [FILE]...
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-c, --create create a new archive
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-e, --extract extract files from an archive
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-f, --file=ARCHIVE use archive file or device ARCHIVE
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-h, --help display this help
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-V, --version display version
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"))
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(exit (or (and usage? 2) 0)))
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options)))
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(define (main args)
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(let* ((options (parse-opts args))
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(create? (option-ref options 'create #f))
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(extract? (option-ref options 'extract #f))
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(file (option-ref options 'file "/dev/stdout"))
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(files (option-ref options '() '())))
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(cond (create?
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(write-ustar-archive file files))
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(extract?
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(read-ustar-archive file files)))))
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