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50/55: gnu: Add r-promises.

From: Ricardo Wurmus
Subject: 50/55: gnu: Add r-promises.
Date: Sat, 21 Apr 2018 17:08:24 -0400 (EDT)

rekado pushed a commit to branch master
in repository guix.

commit d9d66ba963bafaac706044b23407794167f69eab
Author: Ricardo Wurmus <address@hidden>
Date:   Sat Apr 21 09:27:17 2018 +0200

    gnu: Add r-promises.
    * gnu/packages/cran.scm (r-promises): New variable.
 gnu/packages/cran.scm | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/gnu/packages/cran.scm b/gnu/packages/cran.scm
index cc81815..88be6b3 100644
--- a/gnu/packages/cran.scm
+++ b/gnu/packages/cran.scm
@@ -3871,3 +3871,31 @@ exchanging spatial objects with other R packages.")
      "This package provides tools to execute arbitrary R or C functions some
 time after the current time, after the R execution stack has emptied.")
     (license license:gpl2+)))
+(define-public r-promises
+  (package
+    (name "r-promises")
+    (version "1.0.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (cran-uri "promises" version))
+       (sha256
+        (base32
+         "0n2mlv6bvfb4yhgcml696l9vkbw21pz0smqylivr606z99rwgny2"))))
+    (build-system r-build-system)
+    (propagated-inputs
+     `(("r-later" ,r-later)
+       ("r-magrittr" ,r-magrittr)
+       ("r-r6" ,r-r6)
+       ("r-rcpp" ,r-rcpp)
+       ("r-rlang" ,r-rlang)))
+    (home-page "";)
+    (synopsis "Abstractions for promise-based asynchronous programming")
+    (description
+     "This package provides fundamental abstractions for doing asynchronous
+programming in R using promises.  Asynchronous programming is useful for
+allowing a single R process to orchestrate multiple tasks in the background
+while also attending to something else.  Semantics are similar to JavaScript
+promises, but with a syntax that is idiomatic R.")
+    (license license:expat)))

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