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packages: 'fold-packages' takes #:select? parameter.

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* gnu/packages.scm (fold-packages): Add #:select? parameter and honor it.
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Ludovic Courtès 2017-11-06 23:21:08 +01:00
parent c9405c461b
commit 96dc8f3527
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1 changed files with 5 additions and 5 deletions
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gnu/packages.scm
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@ -142,13 +142,13 @@ for system '~a'")
(define* (fold-packages proc init
#:optional
(modules (all-modules (%package-module-path))))
(modules (all-modules (%package-module-path)))
#:key (select? (negate hidden-package?)))
"Call (PROC PACKAGE RESULT) for each available package defined in one of
MODULES, using INIT as the initial value of RESULT. It is guaranteed to never
traverse the same package twice."
MODULES that matches SELECT?, using INIT as the initial value of RESULT. It
is guaranteed to never traverse the same package twice."
(fold-module-public-variables (lambda (object result)
(if (and (package? object)
(not (hidden-package? object)))
(if (and (package? object) (select? object))
(proc object result)
result))
init