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guix describe: Add '--list-formats'

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* guix/scripts/describe.scm (%available-formats): New variable.
(list-formats): New procedure.
(%options, show-help): Add --list-formats
* doc/guix.texi: Add --list-formats

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
This commit is contained in:
Ekaitz Zarraga 2020-05-16 19:57:18 +02:00 committed by Ludovic Courtès
parent e5b495c18f
commit 9a27d84b7a
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2 changed files with 19 additions and 1 deletions
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3
doc/guix.texi
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@ -4471,6 +4471,9 @@ produce a list of channel specifications in JSON format;
produce a list of channel specifications in Recutils format.
@end table
@item --list-formats
Display available formats for @option{--format} option.
@item --profile=@var{profile}
@itemx -p @var{profile}
Display information about @var{profile}.

17
guix/scripts/describe.scm
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@ -1,6 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
;;; Copyright © 2020 Ekaitz Zarraga <ekaitz@elenq.tech>
;;;
;;; This file is part of GNU Guix.
;;;
@ -41,14 +42,26 @@ (define-module (guix scripts describe)
;;;
;;; Command-line options.
;;;
(define %available-formats '("human" "channels" "json" "recutils"))
(define (list-formats)
(display (G_ "The available formats are:\n"))
(newline)
(for-each (lambda (f)
(format #t " - ~a~%" f))
%available-formats))
(define %options
;; Specifications of the command-line options.
(list (option '(#\f "format") #t #f
(lambda (opt name arg result)
(unless (member arg '("human" "channels" "json" "recutils"))
(unless (member arg %available-formats)
(leave (G_ "~a: unsupported output format~%") arg))
(alist-cons 'format (string->symbol arg) result)))
(option '("list-formats") #f #f
(lambda (opt name arg result)
(list-formats)
(exit 0)))
(option '(#\p "profile") #t #f
(lambda (opt name arg result)
(alist-cons 'profile (canonicalize-profile arg)
@ -70,6 +83,8 @@ (define (show-help)
Display information about the channels currently in use.\n"))
(display (G_ "
-f, --format=FORMAT display information in the given FORMAT"))
(display (G_ "
--list-formats display available formats"))
(display (G_ "
-p, --profile=PROFILE display information about PROFILE"))
(newline)