gnu: Add ruby-method-source.

* gnu/packages/ruby.scm (ruby-method-source): New variable.

gnu/packages/ruby.scm

@@ -844,3 +844,25 @@ to reproduce user environments.")
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     (home-page "http://www.nokogiri.org/")
     (license license:expat)))
+
+(define-public ruby-method-source
+  (package
+    (name "ruby-method-source")
+    (version "0.8.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (rubygems-uri "method_source" version))
+       (sha256
+        (base32
+         "1g5i4w0dmlhzd18dijlqw5gk27bv6dj2kziqzrzb7mpgxgsd1sf2"))))
+    (build-system ruby-build-system)
+    (native-inputs
+     `(("ruby-bacon" ,ruby-bacon)
+       ("git" ,git)))
+    (synopsis "Retrieve the source code for Ruby methods")
+    (description "Method_source retrieves the source code for Ruby methods.
+Additionally, it can extract source code from Proc and Lambda objects or just
+extract comments.")
+    (home-page "https://github.com/banister/method_source")
+    (license license:expat)))