;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2022 Mathieu Othacehe <othacehe@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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.
;;;
;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu compression)
  #:use-module (guix gexp)
  #:use-module (guix ui)
  #:use-module ((gnu packages compression) #:hide (zip))
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-9)
  #:use-module (ice-9 match)
  #:export (compressor
            compressor?
            compressor-name
            compressor-extension
            compressor-command
            %compressors
            lookup-compressor))

;; Type of a compression tool.
(define-record-type <compressor>
  (compressor name extension command)
  compressor?
  (name       compressor-name)      ;string (e.g., "gzip")
  (extension  compressor-extension) ;string (e.g., ".lz")
  (command    compressor-command))  ;gexp (e.g., #~(list "/gnu/store/…/gzip"
                                    ;                    "-9n" ))

(define %compressors
  ;; Available compression tools.
  (list (compressor "gzip"  ".gz"
                    #~(list #+(file-append gzip "/bin/gzip") "-9n"))
        (compressor "lzip"  ".lz"
                    #~(list #+(file-append lzip "/bin/lzip") "-9"))
        (compressor "xz"    ".xz"
                    #~(append (list #+(file-append xz "/bin/xz")
                                    "-e")
                              (%xz-parallel-args)))
        (compressor "bzip2" ".bz2"
                    #~(list #+(file-append bzip2 "/bin/bzip2") "-9"))
        (compressor "zstd" ".zst"
                    ;; The default level 3 compresses better than gzip in a
                    ;; fraction of the time, while the highest level 19
                    ;; (de)compresses more slowly and worse than xz.
                    #~(list #+(file-append zstd "/bin/zstd") "-3"))
        (compressor "none" "" #f)))

(define (lookup-compressor name)
  "Return the compressor object called NAME.  Error out if it could not be
found."
  (or (find (match-lambda
              (($ <compressor> name*)
               (string=? name* name)))
            %compressors)
      (leave (G_ "~a: compressor not found~%") name)))
mmit/gnu/packages/pciutils.scm?id=7f69459aca16756f35f08049c64a1bd77d23f33e'>Merge branch 'master' into staging</a></td><td>Marius Bakke</td></tr>
<tr><td><span title='2018-02-20 02:56:36 +0100'>2018-02-20</span></td><td><a href='/guix/commit/gnu/packages/pciutils.scm?id=280b62b0746648783ae8bbe48ee3479b1b93cca5'>gnu: pciutils: Update to 3.5.6.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-02-19 23:14:01 +0100'>2018-02-19</span></td><td><a href='/guix/commit/gnu/packages/pciutils.scm?id=8af77fe96b43333f05b07f02bfad41b7e7c16aa3'>gnu: pciutils: Use HTTPS home page.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-07-10 10:45:30 +0200'>2017-07-10</span></td><td><a href='/guix/commit/gnu/packages/pciutils.scm?id=a48da398b3ee279c54db7ea70b3c3195acf5c94b'>gnu: pciutils: Tweak description.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-07-10 10:37:48 +0200'>2017-07-10</span></td><td><a href='/guix/commit/gnu/packages/pciutils.scm?id=841e06af71d264b5fbec56f96aec8aa933fbeab2'>gnu: pciutils: Move 'pci.ids.gz' to 'share/hwdata'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-07-10 10:31:19 +0200'>2017-07-10</span></td><td><a href='/guix/commit/gnu/packages/pciutils.scm?id=539a68f938d734cc48c365a2f91521f4c4a4c1f0'>gnu: pciutils: Update to 3.5.5.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-02-27 00:03:37 +0100'>2017-02-27</span></td><td><a href='/guix/commit/gnu/packages/pciutils.scm?id=3ba43a2297eae9401364568522cb847bea376f3f'>gnu: pciutils: Update to 3.5.4.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2016-11-30 17:35:21 +0100'>2016-11-30</span></td><td><a href='/guix/commit/gnu/packages/pciutils.scm?id=873c469e743c9d411614216713dc1679db3f2ed4'>gnu: pciutils: Update to 3.5.2.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-05-29 22:07:47 +0300'>2016-05-29</span></td><td><a href='/guix/commit/gnu/packages/pciutils.scm?id=43ec6ca06e1c94432f35467f3455c9cfa8439aaf'>gnu: pciutils: Add kmod support.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2016-05-29 22:07:47 +0300'>2016-05-29</span></td><td><a href='/guix/commit/gnu/packages/pciutils.scm?id=0ef7a93d78b72153da168d4c356e5789f99f0869'>gnu: pciutils: Use 'modify-phases'.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2016-05-29 22:07:47 +0300'>2016-05-29</span></td><td><a href='/guix/commit/gnu/packages/pciutils.scm?id=fb3c855381eba87725da33fbd936bb9734a40ccf'>gnu: pciutils: Update to 3.5.1.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>