cbaines pushed a commit to branch master
in repository data-service.
commit 0796cb3bd38b8462ccc7ada22f5504e43f88923f
Author: Christopher Baines <[email protected]>
AuthorDate: Sun Oct 3 14:54:10 2021 +0100
Add a chunk procedure
Just a variant of chunk! which doesn't modify the provided list.
---
guix-data-service/utils.scm | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/guix-data-service/utils.scm b/guix-data-service/utils.scm
index c45f518..4f66c9c 100644
--- a/guix-data-service/utils.scm
+++ b/guix-data-service/utils.scm
@@ -31,6 +31,7 @@
par-map&
letpar&
+ chunk
chunk!))
(define (call-with-time-logging action thunk)
@@ -155,6 +156,16 @@
(define par-map& (par-mapper' map cons))
+(define (chunk lst max-length)
+ (if (> (length lst)
+ max-length)
+ (call-with-values (lambda ()
+ (split-at lst max-length))
+ (lambda (first-lst rest)
+ (cons first-lst
+ (chunk rest max-length))))
+ (list lst)))
+
(define (chunk! lst max-length)
(if (> (length lst)
max-length)
