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70 lines
2.8 KiB
Scheme
70 lines
2.8 KiB
Scheme
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2022 Mathieu Othacehe <othacehe@gnu.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 (gnu compression)
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#:use-module (guix gexp)
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#:use-module (guix ui)
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#:use-module ((gnu packages compression) #:hide (zip))
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (ice-9 match)
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#:export (compressor
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compressor?
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compressor-name
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compressor-extension
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compressor-command
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%compressors
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lookup-compressor))
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;; Type of a compression tool.
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(define-record-type <compressor>
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(compressor name extension command)
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compressor?
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(name compressor-name) ;string (e.g., "gzip")
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(extension compressor-extension) ;string (e.g., ".lz")
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(command compressor-command)) ;gexp (e.g., #~(list "/gnu/store/…/gzip"
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; "-9n" ))
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(define %compressors
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;; Available compression tools.
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(list (compressor "gzip" ".gz"
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#~(list #+(file-append gzip "/bin/gzip") "-9n"))
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(compressor "lzip" ".lz"
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#~(list #+(file-append lzip "/bin/lzip") "-9"))
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(compressor "xz" ".xz"
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#~(append (list #+(file-append xz "/bin/xz")
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"-e")
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(%xz-parallel-args)))
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(compressor "bzip2" ".bz2"
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#~(list #+(file-append bzip2 "/bin/bzip2") "-9"))
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(compressor "zstd" ".zst"
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;; The default level 3 compresses better than gzip in a
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;; fraction of the time, while the highest level 19
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;; (de)compresses more slowly and worse than xz.
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#~(list #+(file-append zstd "/bin/zstd") "-3"))
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(compressor "none" "" #f)))
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(define (lookup-compressor name)
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"Return the compressor object called NAME. Error out if it could not be
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found."
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(or (find (match-lambda
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(($ <compressor> name*)
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(string=? name* name)))
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%compressors)
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(leave (G_ "~a: compressor not found~%") name)))
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