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gexp: Add printers for <gexp-input> and <gexp-output>.

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* guix/gexp.scm (write-gexp-input, write-gexp-output): New procedures.
  (<gexp-input>, <gexp-output>): Use them as printers.
This commit is contained in:
Ludovic Courtès 2015-03-30 22:59:24 +02:00
parent c568191a93
commit f73286345e
1 changed files with 16 additions and 0 deletions
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16
guix/gexp.scm
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@ -179,6 +179,15 @@ This is the declarative counterpart of the 'interned-file' monadic procedure."
(output gexp-input-output) ;string
(native? gexp-input-native?)) ;Boolean
(define (write-gexp-input input port)
(match input
(($ <gexp-input> thing output #f)
(format port "#<gexp-input ~s:~a>" thing output))
(($ <gexp-input> thing output #t)
(format port "#<gexp-input native ~s:~a>" thing output))))
(set-record-type-printer! <gexp-input> write-gexp-input)
(define* (gexp-input thing ;convenience procedure
#:optional (output "out")
#:key native?)
@ -193,6 +202,13 @@ whether this should be considered a \"native\" input or not."
gexp-output?
(name gexp-output-name))
(define (write-gexp-output output port)
(match output
(($ <gexp-output> name)
(format port "#<gexp-output ~a>" name))))
(set-record-type-printer! <gexp-output> write-gexp-output)
(define raw-derivation
(store-lift derivation))