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services: Add 'fold-service-types'.

* gnu/services.scm (%distro-root-directory, %service-type-path): New
variables.
(fold-service-types): New procedure.
version-0.14.0
Ludovic Courtès 5 years ago
parent
commit
0c0c1b21d9
No known key found for this signature in database GPG Key ID: 90B11993D9AEBB5
  1. 24
      gnu/services.scm

24
gnu/services.scm

@ -23,6 +23,7 @@
#:use-module (guix store)
#:use-module (guix records)
#:use-module (guix profiles)
#:use-module (guix discovery)
#:use-module (guix sets)
#:use-module (guix ui)
#:use-module ((guix utils) #:select (source-properties->location))
@ -52,6 +53,8 @@
service-type-description
service-type-location
%service-type-path
fold-service-types
service
service?
@ -165,6 +168,27 @@
(set-record-type-printer! <service-type> write-service-type)
(define %distro-root-directory
;; Absolute file name of the module hierarchy.
(dirname (search-path %load-path "guix.scm")))
(define %service-type-path
;; Search path for service types.
(make-parameter `((,%distro-root-directory . "gnu/services")
(,%distro-root-directory . "gnu/system"))))
(define* (fold-service-types proc seed
#:optional
(modules (all-modules (%service-type-path))))
"For each service type exported by one of MODULES, call (PROC RESULT). SEED
is used as the initial value of RESULT."
(fold-module-public-variables (lambda (object result)
(if (service-type? object)
(proc object result)
result))
'()
modules))
;; Services of a given type.
(define-record-type <service>
(make-service type value)

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