;;; 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)))
th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2018-06-25 23:29:46 +0800'>2018-06-25</span></td><td class='logsubject'><a href='/guix/commit/gnu/services/sound.scm?id=1e3861eb00a2e9531bc4326b37a31405e34cc0ff'>services: alsa-service-type: Fix the loading of 'pulse' plugin.</a></td><td>Oleg Pykhalov</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
Fixes &lt;https://bugs.gnu.org/31591&gt;.

* gnu/services/sound.scm (&lt;alsa-configuration&gt;)[alsa-plugins]: New field.
(alsa-config-file): Use 'pcm_type.pulse' and 'ctl_type.pulse' to specify file
paths to the 'pulse' plugin.
* doc/guix.texi (Sound Services): Document this.

Co-authored-by: 宋文武 &lt;iyzsong@member.fsf.org&gt;


</td></tr>
<tr class='logheader'><td><span title='2018-05-02 15:11:13 +0300'>2018-05-02</span></td><td class='logsubject'><a href='/guix/commit/gnu/services/sound.scm?id=8cd1e8e84926dc6ed1012a17609dea2d20ac41b4'>gnu: Add sound service.</a></td><td>Oleg Pykhalov</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* gnu/services/sound.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add this.
* doc/guix.texi (Sound Services): New chapter.


</td></tr>