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installer: keymap: Fix optional fields handling.

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Fixes: <https://issues.guix.gnu.org/50723>.

The keymap xml contains optional shortDescription and description fields. The
assoc-ref call on those fields can return false, handle it correctly.

* gnu/installer/keymap.scm (xkb-rules->models+layouts): Introduce a new
"maybe-empty" helper to deal with optional fields. Use it for shortDescription
and description fields.
This commit is contained in:
Mathieu Othacehe 2021-09-21 20:35:49 +00:00
parent a3324e5753
commit d58e52b071
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GPG Key ID: 8354763531769CA6
1 changed files with 11 additions and 6 deletions
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17
gnu/installer/keymap.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2018, 2021 Mathieu Othacehe <othacehe@gnu.org>
;;; Copyright © 2020 Florian Pelz <pelzflorian@pelzflorian.de>
;;;
;;; This file is part of GNU Guix.
@ -79,6 +79,11 @@
"Parse FILE and return two values, the list of supported X11-KEYMAP-MODEL
and X11-KEYMAP-LAYOUT records. FILE is an XML file from the X Keyboard
Configuration Database, describing possible XKB configurations."
(define maybe-empty
(match-lambda
((x) x)
(#f "")))
(define (model m)
(sxml-match m
[(model
@ -108,7 +113,7 @@ Configuration Database, describing possible XKB configurations."
. ,rest-variant))
(x11-keymap-variant
(name name)
(description (car
(description (maybe-empty
(assoc-ref rest-variant 'description))))]))
(define (layout l)
@ -120,9 +125,9 @@ Configuration Database, describing possible XKB configurations."
(variantList ,[variant -> v] ...))
(x11-keymap-layout
(name name)
(synopsis (car
(synopsis (maybe-empty
(assoc-ref rest-layout 'shortDescription)))
(description (car
(description (maybe-empty
(assoc-ref rest-layout 'description)))
(variants (list v ...)))]
[(layout
@ -131,9 +136,9 @@ Configuration Database, describing possible XKB configurations."
. ,rest-layout))
(x11-keymap-layout
(name name)
(synopsis (car
(synopsis (maybe-empty
(assoc-ref rest-layout 'shortDescription)))
(description (car
(description (maybe-empty
(assoc-ref rest-layout 'description)))
(variants '()))]))