[New Package] ruby_docopt (#5635)

packages/ruby_docopt.rb

+require 'package'
+
+class Ruby_docopt < Package
+  description 'Docopt parses command line arguments from nothing more than a usage message.'
+  homepage 'http://docopt.org/'
+  version '0.6.1'
+  license 'MIT'
+  compatibility 'all'
+  source_url 'https://github.com/docopt/docopt.rb.git'
+  git_hashtag '504f310c5fd66e9f3c36b078156e5f44573ff1d3'
+
+  depends_on 'ruby'
+
+  def self.patch
+    # https://github.com/docopt/docopt.rb/pull/37
+    system "sed -i 's:0.6.0:0.6.1:' lib/docopt.rb"
+    system "sed -i 's:0.6.0:0.6.1:' docopt.gemspec"
+  end
+
+  def self.build
+    system 'rake build'
+  end
+
+  def self.install
+    system "gem install --build=#{CREW_DEST_DIR} pkg/docopt-0.6.1.gem"
+  end
+end