From 8eb17cebc1027b5ae1c4047c704b92ad73b783fd Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Wed, 1 Jun 2022 16:53:01 +0200
Subject: home: services: Add 'lookup-home-service-types' procedure.

* gnu/home/services.scm (lookup-home-service-types): New procedure.
* tests/home-services.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
---
 gnu/home/services.scm | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'gnu/home')

diff --git a/gnu/home/services.scm b/gnu/home/services.scm
index 8284a4f3fc..5ee3357792 100644
--- a/gnu/home/services.scm
+++ b/gnu/home/services.scm
@@ -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)))))
-- 
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