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| author | zimoun <zimon.toutoune@gmail.com> | 2021-01-19 22:28:09 +0100 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2021-02-03 12:41:28 +0100 |
| commit | 0df4d5aa04b53e8a6842045deb323b785db5b20a (patch) | |
| tree | 5eb76b5cfea9706ca4df497d5aefe95212971d81 | |
| parent | 9505b54a4f9f0265c9d8be53763f0c59d6f62a44 (diff) | |
guix: scripts: Add hint for option typo.
* guix/scripts.scm (option-hint): New procedure.
(parse-command-line): Add 'option-hint'.
Co-authored-by: Ludovic Courtès <ludo@gnu.org>
| -rw-r--r-- | guix/scripts.scm | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/guix/scripts.scm b/guix/scripts.scm index 34cba35401..c9ea9f2e29 100644 --- a/guix/scripts.scm +++ b/guix/scripts.scm @@ -4,6 +4,7 @@ ;;; Copyright © 2015, 2016 Alex Kost <alezost@gmail.com> ;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org> ;;; Copyright © 2021 Ricardo Wurmus <rekado@elephly.net> +;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com> ;;; ;;; This file is part of GNU Guix. ;;; @@ -112,6 +113,13 @@ procedure, but both the category and synopsis are meant to be read (parsed) by doc body ...))))) +(define (option-hint guess options) + "Return the closest long-name OPTIONS from GUESS, +according to'string-distance'." + (define (options->long-names options) + (filter string? (append-map option-names options))) + (string-closest guess (options->long-names options) #:threshold 3)) + (define (args-fold* args options unrecognized-option-proc operand-proc . seeds) "A wrapper on top of `args-fold' that does proper user-facing error reporting." @@ -149,7 +157,12 @@ parameter of 'args-fold'." ;; Actual parsing takes place here. (apply args-fold* args options (lambda (opt name arg . rest) - (leave (G_ "~A: unrecognized option~%") name)) + (let ((hint (option-hint name options))) + (report-error (G_ "~A: unrecognized option~%") name) + (when hint + (display-hint + (format #f (G_ "Did you mean @code{~a}?~%") hint))) + (exit 1))) argument-handler seeds)) |