add open struct support

lib/awesome_print.rb

@@ -36,4 +36,5 @@ unless defined?(AwesomePrint::Inspector)
   require File.dirname(__FILE__) + "/awesome_print/ext/no_brainer"     if defined?(NoBrainer)
   require File.dirname(__FILE__) + "/awesome_print/ext/ripple"         if defined?(Ripple)
   require File.dirname(__FILE__) + "/awesome_print/ext/sequel"         if defined?(Sequel)
+  require File.dirname(__FILE__) + "/awesome_print/ext/ostruct"        if defined?(OpenStruct)
 end

lib/awesome_print/ext/ostruct.rb

@@ -0,0 +1,27 @@
+# Copyright (c) 2010-2013 Michael Dvorkin
+#
+# Awesome Print is freely distributable under the terms of MIT license.
+# See LICENSE file or http://www.opensource.org/licenses/mit-license.php
+#------------------------------------------------------------------------------
+module AwesomePrint
+  module OpenStruct
+    def self.included(base)
+      base.send :alias_method, :cast_without_ostruct, :cast
+      base.send :alias_method, :cast, :cast_with_ostruct
+    end
+
+    def cast_with_ostruct(object, type)
+      cast = cast_without_ostruct(object, type)
+      if (defined?(::OpenStruct)) && (object.is_a?(::OpenStruct))
+        cast = :open_struct_instance
+      end
+      cast
+    end
+
+    def awesome_open_struct_instance(object)
+      "#{object.class} #{awesome_hash(object.marshal_dump)}"
+    end
+  end
+end
+
+AwesomePrint::Formatter.send(:include, AwesomePrint::OpenStruct)

spec/ext/ostruct_spec.rb

@@ -0,0 +1,31 @@
+require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')
+
+begin
+  require 'ostruct'
+  require 'awesome_print/ext/ostruct'
+
+  describe 'AwesomePrint Ostruct extension' do
+    before do
+      stub_dotfile!
+      @ap = AwesomePrint::Inspector.new(:plain => true, :sort_keys => true)
+    end
+
+    it "empty hash" do
+      struct = OpenStruct.new
+      @ap.send(:awesome, struct).should == "OpenStruct {}"
+    end
+
+    it "plain multiline" do
+      struct = OpenStruct.new :name => "Marshall Shen", :address => "605 Madion St."
+      @ap.send(:awesome, struct).should == <<-EOS.strip
+OpenStruct {
+    :address => "605 Madion St.",
+       :name => "Marshall Shen"
+}
+EOS
+    end
+  end
+
+rescue LoadError => error
+  puts "Skipping OpenStruct specs: #{error}"
+end