diff options
Diffstat (limited to 'gnu/services')
| -rw-r--r-- | gnu/services/configuration.scm | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/gnu/services/configuration.scm b/gnu/services/configuration.scm index 21cb829382..72b1d1cec6 100644 --- a/gnu/services/configuration.scm +++ b/gnu/services/configuration.scm @@ -48,6 +48,7 @@ serialize-configuration define-maybe + define-maybe/no-serialization validate-configuration generate-documentation configuration->documentation @@ -107,20 +108,34 @@ does not have a default value" field kind))) "Assemble PARTS into a raw (unhygienic) identifier." (datum->syntax ctx (symbol-append (syntax->datum parts) ...))) +(define (define-maybe-helper serialize? syn) + (syntax-case syn () + ((_ stem) + (with-syntax + ((stem? (id #'stem #'stem #'?)) + (maybe-stem? (id #'stem #'maybe- #'stem #'?)) + (serialize-stem (id #'stem #'serialize- #'stem)) + (serialize-maybe-stem (id #'stem #'serialize-maybe- #'stem))) + #`(begin + (define (maybe-stem? val) + (or (eq? val 'disabled) (stem? val))) + #,@(if serialize? + (list #'(define (serialize-maybe-stem field-name val) + (if (stem? val) + (serialize-stem field-name val) + ""))) + '())))))) + (define-syntax define-maybe (lambda (x) - (syntax-case x () + (syntax-case x (no-serialization) + ((_ stem (no-serialization)) + (define-maybe-helper #f #'(_ stem))) ((_ stem) - (with-syntax - ((stem? (id #'stem #'stem #'?)) - (maybe-stem? (id #'stem #'maybe- #'stem #'?)) - (serialize-stem (id #'stem #'serialize- #'stem)) - (serialize-maybe-stem (id #'stem #'serialize-maybe- #'stem))) - #'(begin - (define (maybe-stem? val) - (or (eq? val 'disabled) (stem? val))) - (define (serialize-maybe-stem field-name val) - (if (stem? val) (serialize-stem field-name val) "")))))))) + (define-maybe-helper #t #'(_ stem)))))) + +(define-syntax-rule (define-maybe/no-serialization stem) + (define-maybe stem (no-serialization))) (define (define-configuration-helper serialize? syn) (syntax-case syn () |