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home: services: Add 'lookup-home-service-types' procedure.

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* gnu/home/services.scm (lookup-home-service-types): New procedure.
* tests/home-services.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
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Ludovic Courtès 2022-06-01 16:53:01 +02:00
parent 3f83c0b7c7
commit 8eb17cebc1
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gnu/home/services.scm
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@ -33,6 +33,7 @@
#:use-module (guix modules)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:use-module (ice-9 vlist)
#:export (home-service-type
home-profile-service-type
@ -50,6 +51,7 @@
xdg-data-files-directory
fold-home-service-types
lookup-home-service-types
home-provenance
%initialize-gettext)
@ -605,3 +607,13 @@ environment, and its configuration file, when available.")))
(define* (fold-home-service-types proc seed)
(fold-service-types proc seed (all-home-service-modules)))
(define lookup-home-service-types
(let ((table
(delay (fold-home-service-types (lambda (type result)
(vhash-consq (service-type-name type)
type result))
vlist-null))))
(lambda (name)
"Return the list of services with the given NAME (a symbol)."
(vhash-foldq* cons '() name (force table)))))