[PATCH 01/19] gnu: Add r-assertthat.

[Vicente Vera <vicentemvp@gmail.com>]

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From 3c84aed40d729a2de02e891fa43c1000cec6d602 Mon Sep 17 00:00:00 2001
From: Vicente Vera Parra <vicentemvp@gmail.com>
Date: Sun, 13 Sep 2015 13:03:01 -0300
Subject: [PATCH 01/19] gnu: Add r-assertthat.

* gnu/packages/statistics.scm (r-assertthat): New variable.
---
 gnu/packages/statistics.scm | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/gnu/packages/statistics.scm b/gnu/packages/statistics.scm
index 29cd34a..9063496 100644
--- a/gnu/packages/statistics.scm
+++ b/gnu/packages/statistics.scm
@@ -498,3 +498,23 @@ by step from multiple data sources.  It also implements a sophisticated
 multidimensional conditioning system and a consistent interface to map data to
 aesthetic attributes.")
     (license license:gpl2+)))
+
+(define-public r-assertthat
+  (package
+    (name "r-assertthat")
+    (version "0.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://cran/src/contrib/assertthat_"
+                                  version ".tar.gz"))
+              (sha256
+               (base32 "0dwsqajyglfscqilj843qfqn1ndbqpswa7b4l1d633qjk9d68qqk"))))
+    (build-system r-build-system)
+    (home-page "https://github.com/hadley/assertthat")
+    (synopsis "Easy pre and post assertions")
+    (description
+     "Assertthat is an extension to stopifnot() that makes it easy to
+declare the pre and post conditions that you code should satisfy,
+while also producing friendly error messages so that your users know
+what they've done wrong.")
+    (license license:gpl3+)))
-- 
2.5.1