diff options
Diffstat (limited to 'gnu/services/configuration.scm')
| -rw-r--r-- | gnu/services/configuration.scm | 80 |
1 files changed, 53 insertions, 27 deletions
diff --git a/gnu/services/configuration.scm b/gnu/services/configuration.scm index 90f12a8d39..15bd30970c 100644 --- a/gnu/services/configuration.scm +++ b/gnu/services/configuration.scm @@ -2,6 +2,7 @@ ;;; Copyright © 2015 Andy Wingo <wingo@igalia.com> ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com> ;;; Copyright © 2017, 2018 Clément Lassieur <clement@lassieur.org> +;;; Copyright © 2021 Xinglu Chen <public@yoctocell.xyz> ;;; ;;; This file is part of GNU Guix. ;;; @@ -63,6 +64,10 @@ (define (configuration-missing-field kind field) (configuration-error (format #f "~a configuration missing required field ~a" kind field))) +(define (configuration-no-default-value kind field) + (configuration-error + (format #f "The field `~a' of the `~a' configuration record \ +does not have a default value" field kind))) (define-record-type* <configuration-field> configuration-field make-configuration-field configuration-field? @@ -112,7 +117,7 @@ (define-syntax define-configuration (lambda (stx) (syntax-case stx () - ((_ stem (field (field-type def) doc) ...) + ((_ stem (field (field-type def ...) doc) ...) (with-syntax (((field-getter ...) (map (lambda (field) (id #'stem #'stem #'- field)) @@ -121,36 +126,57 @@ (map (lambda (type) (id #'stem type #'?)) #'(field-type ...))) + ((field-default ...) + (map (match-lambda + ((field-type default-value) + default-value) + ((field-type) + ;; Quote `undefined' to prevent a possibly + ;; unbound warning. + (syntax 'undefined))) + #'((field-type def ...) ...))) ((field-serializer ...) (map (lambda (type) (id #'stem #'serialize- type)) #'(field-type ...)))) - #`(begin - (define-record-type* #,(id #'stem #'< #'stem #'>) - #,(id #'stem #'% #'stem) - #,(id #'stem #'make- #'stem) - #,(id #'stem #'stem #'?) - (%location #,(id #'stem #'-location) - (default (and=> (current-source-location) - source-properties->location)) - (innate)) - (field field-getter (default def)) - ...) - (define #,(id #'stem #'stem #'-fields) - (list (configuration-field - (name 'field) - (type 'field-type) - (getter field-getter) - (predicate field-predicate) - (serializer field-serializer) - (default-value-thunk (lambda () def)) - (documentation doc)) - ...)) - (define-syntax-rule (stem arg (... ...)) - (let ((conf (#,(id #'stem #'% #'stem) arg (... ...)))) - (validate-configuration conf - #,(id #'stem #'stem #'-fields)) - conf)))))))) + #`(begin + (define-record-type* #,(id #'stem #'< #'stem #'>) + #,(id #'stem #'% #'stem) + #,(id #'stem #'make- #'stem) + #,(id #'stem #'stem #'?) + (%location #,(id #'stem #'-location) + (default (and=> (current-source-location) + source-properties->location)) + (innate)) + #,@(map (lambda (name getter def) + (if (eq? (syntax->datum def) (quote 'undefined)) + #`(#,name #,getter) + #`(#,name #,getter (default #,def)))) + #'(field ...) + #'(field-getter ...) + #'(field-default ...))) + (define #,(id #'stem #'stem #'-fields) + (list (configuration-field + (name 'field) + (type 'field-type) + (getter field-getter) + (predicate field-predicate) + (serializer field-serializer) + (default-value-thunk + (lambda () + (display '#,(id #'stem #'% #'stem)) + (if (eq? (syntax->datum field-default) + 'undefined) + (configuration-no-default-value + '#,(id #'stem #'% #'stem) 'field) + field-default))) + (documentation doc)) + ...)) + (define-syntax-rule (stem arg (... ...)) + (let ((conf (#,(id #'stem #'% #'stem) arg (... ...)))) + (validate-configuration conf + #,(id #'stem #'stem #'-fields)) + conf)))))))) (define (serialize-package field-name val) "") |