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| author | Ludovic Courtès <ludo@gnu.org> | 2017-11-08 13:26:08 +0100 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2017-11-08 22:31:58 +0100 |
| commit | 49483f71381ad32cdbe81b1c8ed2cc023329cc18 (patch) | |
| tree | fc5c0bd7a626e2c1d5f505b00dc1201a3dd98c1c /gnu | |
| parent | 3943913faca20854453cb873144e2844a07ac31f (diff) | |
| download | guix-49483f71381ad32cdbe81b1c8ed2cc023329cc18.tar guix-49483f71381ad32cdbe81b1c8ed2cc023329cc18.tar.gz | |
services: Add 'lookup-service-types'.
* gnu/services.scm (lookup-service-types): New procedure.
* tests/services.scm ("lookup-service-types"): New test.
Diffstat (limited to 'gnu')
| -rw-r--r-- | gnu/services.scm | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gnu/services.scm b/gnu/services.scm index df1bedeb9b..016ff08e0b 100644 --- a/gnu/services.scm +++ b/gnu/services.scm @@ -55,6 +55,7 @@ %service-type-path fold-service-types + lookup-service-types service service? @@ -192,6 +193,16 @@ is used as the initial value of RESULT." seed modules)) +(define lookup-service-types + (let ((table + (delay (fold-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))))) + ;; Services of a given type. (define-record-type <service> (make-service type value) |