gnu: Add ruby-debug-inspector.

* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* gnu/packages/rails.scm: New file.

gnu/local.mk

@@ -285,6 +285,7 @@ GNU_SYSTEM_MODULES =				\
   %D%/packages/qemu.scm				\
   %D%/packages/qt.scm				\
   %D%/packages/ragel.scm			\
+  %D%/packages/rails.scm			\
   %D%/packages/ratpoison.scm			\
   %D%/packages/rc.scm				\
   %D%/packages/rdesktop.scm			\

gnu/packages/rails.scm

@@ -0,0 +1,57 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Matthew Jordan <matthewjordandevops@yandex.com>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages rails)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix download)
+  #:use-module (guix packages)
+  #:use-module (gnu packages ruby)
+  #:use-module (guix build-system ruby))
+
+(define-public ruby-debug-inspector
+  (package
+    (name "ruby-debug-inspector")
+    (version "0.0.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (rubygems-uri "debug_inspector" version))
+       (sha256
+        (base32
+         "109761g00dbrw5q0dfnbqg8blfm699z4jj70l4zrgf9mzn7ii50m"))))
+    (build-system ruby-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (replace 'check
+           (lambda _
+             (and
+              (zero? (system* "rake" "compile"))
+              (zero?
+               (system*
+                "ruby" "-Ilib" "-e"
+                (string-append
+                 "require 'debug_inspector'; RubyVM::DebugInspector."
+                 "open{|dc| p dc.backtrace_locations}")))))))))
+    (synopsis "Ruby wrapper for the MRI 2.0 debug_inspector API")
+    (description
+     "This package provides a Ruby wrapper for the MRI 2.0 debug_inspector
+API.")
+    (home-page
+     "https://github.com/banister/debug_inspector")
+    (license license:expat)))