[PATCH 18/19] gnu: Add r-r6.

[Vicente Vera <vicentemvp@gmail.com>]

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From 11678514207e1fc5da04dca00d89ff9f67a67d2b Mon Sep 17 00:00:00 2001
From: Vicente Vera Parra <vicentemvp@gmail.com>
Date: Sun, 13 Sep 2015 13:29:38 -0300
Subject: [PATCH 18/19] gnu: Add r-r6.

* gnu/packages/statistics.scm (r-r6): New variable.
---
 gnu/packages/statistics.scm | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/gnu/packages/statistics.scm b/gnu/packages/statistics.scm
index b283bff..1796caf 100644
--- a/gnu/packages/statistics.scm
+++ b/gnu/packages/statistics.scm
@@ -854,3 +854,33 @@ package was inspired by the 'chalk' 'JavaScript' project.")
      "A unit testing system designed to be fun, flexible and easy to
 set up.")
     (license license:expat)))
+
+(define-public r-r6
+  (package
+    (name "r-r6")
+    (version "2.1.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://cran/src/contrib/R6_"
+                                  version ".tar.gz"))
+              (sha256
+               (base32 "16qq35bgxgswf989yvsqkb6fv7srpf8n8dv2s2c0z9n6zgmwq66m"))))
+    (build-system r-build-system)
+    (propagated-inputs
+     `(("r-knitr" ,r-knitr)
+       ("r-microbenchmark" ,r-microbenchmark)
+       ("r-pryr" ,r-pryr)
+       ("r-testthat" ,r-testthat)
+       ("r-ggplot2" ,r-ggplot2)
+       ("r-scales" ,r-scales)))
+    (home-page "https://github.com/wch/R6/")
+    (synopsis "Classes with Reference Semantics")
+    (description
+     "The R6 package allows the creation of classes with reference
+semantics, similar to R's built-in reference classes. Compared to
+reference classes, R6 classes are simpler and lighter-weight, and they
+are not built on S4 classes so they do not require the methods
+package. These classes allow public and private members, and they
+support inheritance, even when the classes are defined in different
+packages.")
+    (license license:expat)))
-- 
2.5.1