lib.strings: add `replicate`

`strings.replicate` returns n copies of a string, concatenated into a new
string

Co-authored-by: Silvan Mosberger <github@infinisil.com>

2 files changed, 19 insertions, 0 deletions

diff --git a/lib/strings.nix b/lib/strings.nix
index 628669d86bbd4..695aaaacd3488 100644
--- a/lib/strings.nix
+++ b/lib/strings.nix
@@ -144,6 +144,20 @@ rec {
   */
   concatLines = concatMapStrings (s: s + "\n");
 
+  /*
+    Replicate a string n times,
+    and concatenate the parts into a new string.
+
+    Type: replicate :: int -> string -> string
+
+    Example:
+      replicate 3 "v"
+      => "vvv"
+      replicate 5 "hello"
+      => "hellohellohellohellohello"
+  */
+  replicate = n: s: concatStrings (lib.lists.replicate n s);
+
   /* Construct a Unix-style, colon-separated search path consisting of
      the given `subDir` appended to each of the given paths.
 
diff --git a/lib/tests/misc.nix b/lib/tests/misc.nix
index 2e7fda2b1f8b1..1fb857a65e998 100644
--- a/lib/tests/misc.nix
+++ b/lib/tests/misc.nix
@@ -191,6 +191,11 @@ runTests {
     expected = "a\nb\nc\n";
   };
 
+  testReplicateString = {
+    expr = strings.replicate 5 "hello";
+    expected = "hellohellohellohellohello";
+  };
+
   testSplitStringsSimple = {
     expr = strings.splitString "." "a.b.c.d";
     expected = [ "a" "b" "c" "d" ];