gnu: Add r-future.

* gnu/packages/cran.scm (r-future): New variable.

gnu/packages/cran.scm

@@ -10558,3 +10558,35 @@ (define-public r-globals
 simple as possible to identify global objects for the purpose of exporting
 them in distributed compute environments.")
     (license license:lgpl2.1+)))
+
+(define-public r-future
+  (package
+    (name "r-future")
+    (version "1.11.1.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "future" version))
+       (sha256
+        (base32
+         "1s4lyqg4mm1drzc6czaalmhmxfjgp4nznb14ql5xzny9rprgz43i"))))
+    (build-system r-build-system)
+    (propagated-inputs
+     `(("r-digest" ,r-digest)
+       ("r-globals" ,r-globals)
+       ("r-listenv" ,r-listenv)))
+    (native-inputs
+     `(("r-r-rsp" ,r-r-rsp))) ; vignette builder
+    (home-page "https://github.com/HenrikBengtsson/future")
+    (synopsis "Unified parallel and distributed processing in R")
+    (description
+     "The purpose of this package is to provide a lightweight and unified
+Future API for sequential and parallel processing of R expression via futures.
+This package implements sequential, multicore, multisession, and cluster
+futures.  With these, R expressions can be evaluated on the local machine, in
+parallel a set of local machines, or distributed on a mix of local and remote
+machines.  Extensions to this package implement additional backends for
+processing futures via compute cluster schedulers etc.  Because of its unified
+API, there is no need to modify any code in order to switch from sequential on
+the local machine to, say, distributed processing on a remote compute cluster.")
+    (license license:lgpl2.1+)))