03/66: gnu: Add ruby-contracts.

[guix-commits]

cbaines pushed a commit to branch master
in repository guix.

commit 2ed201c11296ae79b4a252934e219dfeb6e91d5e
Author: Christopher Baines <address@hidden>
Date:   Sun Jan 27 08:45:21 2019 +0000

    gnu: Add ruby-contracts.
    
    * gnu/packages/ruby.scm (ruby-contracts): New variable.
---
 gnu/packages/ruby.scm | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/gnu/packages/ruby.scm b/gnu/packages/ruby.scm
index c9ca5b0..e02eac6 100644
--- a/gnu/packages/ruby.scm
+++ b/gnu/packages/ruby.scm
@@ -740,6 +740,40 @@ format.")
     (home-page "https://github.com/nicksieger/ci_reporter";)
     (license license:expat)))
 
+(define-public ruby-contracts
+  (package
+    (name "ruby-contracts")
+    (version "0.16.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (rubygems-uri "contracts" version))
+       (sha256
+        (base32
+         "119f5p1n6r5svbx8h09za6a4vrsnj5i1pzr9cqdn9hj3wrxvyl3a"))))
+    (build-system ruby-build-system)
+    (arguments
+     '(#:test-target "spec"
+       #:phases
+       (modify-phases %standard-phases
+         ;; Don't run or require rubocop, the code linting tool, as this is a
+         ;; bit unnecessary.
+         (add-after 'unpack 'dont-run-rubocop
+          (lambda _
+            (substitute* "Rakefile"
+              ((".*rubocop.*") "")
+              ((".*RuboCop.*") ""))
+            #t)))))
+    (native-inputs
+     `(("ruby-rspec" ,ruby-rspec)))
+    (synopsis "Method contracts for Ruby")
+    (description
+     "This library provides contracts for Ruby.  A contract describes the
+correct inputs and output for a method, and will raise an error if a incorrect
+value is found.")
+    (home-page "https://github.com/egonSchiele/contracts.ruby";)
+    (license license:bsd-2)))
+
 (define-public ruby-czmq-ffi-gen
   (package
     (name "ruby-czmq-ffi-gen")