Subject: [PATCH] gnu: Add ghc-lrucache.

From: Daniel Meißner<[email-masked]>
Date: Fri, 12 Nov 2021 10:11:04 +0100

* gnu/packages/haskell-xyz.scm (ghc-lrucache): New variable.
---
 gnu/packages/haskell-xyz.scm | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/gnu/packages/haskell-xyz.scm b/gnu/packages/haskell-xyz.scm
index ae077f7400..d8382252d0 100644
--- a/gnu/packages/haskell-xyz.scm
+++ b/gnu/packages/haskell-xyz.scm
@@ -16683,3 +16683,25 @@ (define-public ghc-singleton-bool
      "This package provides Type-level booleans.")
     (license license:bsd-3)))
 
+(define-public ghc-lrucache
+  (package
+    (name "ghc-lrucache")
+    (version "1.2.0.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "https://hackage.haskell.org/package/lrucache/lrucache-"
+             version
+             ".tar.gz"))
+       (sha256
+        (base32 "11avhnjnb89rvn2s41jhh5r40zgp7r6kb5c0hcfiibpabqvv46pw"))))
+    (build-system haskell-build-system)
+    (inputs `(("ghc-contravariant" ,ghc-contravariant)))
+    (home-page "https://github.com/chowells79/lrucache")
+    (synopsis "Simple, Pure LRU cache")
+    (description
+     "This package contains a simple, pure LRU cache, implemented in terms of
+@code{Data.Map}.  It also contains a mutable IO wrapper providing atomic
+updates to an LRU cache.")
+    (license license:bsd-3)))
-- 
2.33.1