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system: Add hint for action typo. 

* guix/scripts/system.scm (actions): New variable.
(define-command): Add hint for action typo.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
master
zimoun 2021-09-01 11:57:56 +02:00 committed by Ludovic Courtès
parent 1cf866c863
commit b8b56badd3
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1 changed files with 20 additions and 11 deletions
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31
guix/scripts/system.scm
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@ -9,6 +9,7 @@
;;; Copyright © 2020 Julien Lepiller <julien@lepiller.eu>
;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2021 Brice Waegeneire <brice@waegenei.re>
;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
@ -1152,6 +1153,13 @@ Some ACTIONS support additional ARGS.\n"))
;;; Entry point.
;;;
(define actions '("build" "container" "vm" "vm-image" "image" "disk-image"
"reconfigure" "init"
"extension-graph" "shepherd-graph"
"list-generations" "describe"
"delete-generations" "roll-back"
"switch-generation" "search" "docker-image"))
(define (process-action action args opts)
"Process ACTION, a sub-command, with the arguments are listed in ARGS.
ACTION must be one of the sub-commands that takes an operating system
@ -1335,17 +1343,18 @@ argument list and OPTS is the option alist."
(define (parse-sub-command arg result)
;; Parse sub-command ARG and augment RESULT accordingly.
(if (assoc-ref result 'action)
(alist-cons 'argument arg result)
(let ((action (string->symbol arg)))
(case action
((build container vm vm-image image disk-image reconfigure init
extension-graph shepherd-graph
list-generations describe
delete-generations roll-back
switch-generation search docker-image)
(alist-cons 'action action result))
(else (leave (G_ "~a: unknown action~%") action))))))
(cond ((assoc-ref result 'action)
(alist-cons 'argument arg result))
((member arg actions)
(let ((action (string->symbol arg)))
(alist-cons 'action action result)))
(else
(let ((hint (string-closest arg actions #:threshold 3)))
(report-error (G_ "~a: unknown action~%") arg)
(when hint
(display-hint
(format #f (G_ "Did you mean @code{~a}?~%") hint)))
(exit 1)))))
(define (match-pair car)
;; Return a procedure that matches a pair with CAR.