;;; 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"
                            (format #f "--threads=~a" (parallel-job-count))))
        (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)))
unk-types): New variable.
(&lt;hunk&gt;): Rename hunk-definition? getter to 'hunk-type'.
(diff-info): Mute a git warning by separating file names from arguments with
'--'.  Rename the 'definitions?' variable to 'type'.
Use the 'addition type when a new package addition is detected, 'removal when
removed else #f.
(add-commit-message): Re-indent.
(remove-commit-message): New procedure.
(main)[definitions]: Make commit message conditional depending on whether it
is an addition or removal.
[changes]: Adjust indentation.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-05-31 14:52:13 -0400'>2022-05-31</span></td><td><a href='/guix/commit/etc/committer.scm.in?id=6c956243bc7972644e947563a45e33d73042afdc'>etc/committer: Prefix (sxml xpath) symbols to avoid name conflict.</a><span class='msg-avail'>...<span class='msg-tooltip'>This avoids a naming conflict for 'filter', provided by both (srfi srfi-1)
and (sxml xpath).

* etc/committer.scm.in: Use 'use-modules' instead of 'import', and use a
prefix for the (sxml xpath) module.
(new-sexp): Adjust accordingly.
(change-commit-message): Likewise.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-01-23 14:01:30 +0100'>2022-01-23</span></td><td><a href='/guix/commit/etc/committer.scm.in?id=67d74daf0c8b7b6d786859f0be659021f0a153d8'>etc: committer: Support plain input lists.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/committer.scm.in (change-commit-message): Support new-style plain list
inputs in addition to old-style inputs with labels.
</span></span></td><td>Ricardo Wurmus</td></tr>