[bug#30657] [PATCH 3/4] services: utils: move 'flatten' from (gnu services web).

["Clément Lassieur" <clement@lassieur.org>]

* gnu/services/web.scm (flatten): Move it...
* gnu/services/utils.scm (flatten): ...to here, and export it.
---
 gnu/services/utils.scm | 12 +++++++++++-
 gnu/services/web.scm   |  9 +--------
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/gnu/services/utils.scm b/gnu/services/utils.scm
index a8d7981b2..4b7c9c219 100644
--- a/gnu/services/utils.scm
+++ b/gnu/services/utils.scm
@@ -17,8 +17,10 @@
 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
 (define-module (gnu services utils)
+  #:use-module (srfi srfi-1)
   #:export (push-tokens
-            with-tokens-to-list))
+            with-tokens-to-list
+            flatten))
 
 (define %tokens-stack (make-parameter #f))
 
@@ -36,6 +38,14 @@ list."
     (thunk)
     (%tokens-stack)))
 
+(define (flatten . lst)
+  "Return a list that recursively concatenates all sub-lists of LST."
+  (define (flatten1 head out)
+    (if (list? head)
+        (fold-right flatten1 out head)
+        (cons head out)))
+  (fold-right flatten1 '() lst))
+
 ;;; Local Variables:
 ;;; eval: (put 'with-tokens-to-list 'scheme-indent-function 0)
 ;;; End:
diff --git a/gnu/services/web.scm b/gnu/services/web.scm
index beda481b0..38af66367 100644
--- a/gnu/services/web.scm
+++ b/gnu/services/web.scm
@@ -29,6 +29,7 @@
   #:use-module (gnu packages admin)
   #:use-module (gnu packages web)
   #:use-module (gnu packages php)
+  #:use-module (gnu services utils)
   #:use-module (guix records)
   #:use-module (guix gexp)
   #:use-module ((guix utils) #:select (version-major))
@@ -499,14 +500,6 @@ of index files."
         (nginx-upstream-configuration-servers upstream))
    "    }\n"))
 
-(define (flatten . lst)
-  "Return a list that recursively concatenates all sub-lists of LST."
-  (define (flatten1 head out)
-    (if (list? head)
-        (fold-right flatten1 out head)
-        (cons head out)))
-  (fold-right flatten1 '() lst))
-
 (define (default-nginx-config config)
   (match-record config
                 <nginx-configuration>
-- 
2.16.2