Added Jbuilder support

Author: gazay

gon.gemspec

@@ -20,6 +20,9 @@ Gem::Specification.new do |s|
   s.require_paths = ["lib"]
   s.add_dependency "actionpack", '>= 2.3.0'
   s.add_dependency "rabl"
+  if RUBY_VERSION =~ /9/
+    s.add_dependency "jbuilder"
+  end
   s.add_dependency "json"
   s.add_development_dependency "rspec"
 end

lib/gon.rb

@@ -2,6 +2,9 @@
 require 'action_controller'
 require 'gon/helpers'
 require 'gon/rabl'
+if RUBY_VERSION =~ /9/
+  require 'gon/jbuilder'
+end
 
 module Gon
   class << self
@@ -67,5 +70,24 @@ def rabl(view_path, options = {})
         set_variable('rabl', rabl_data)
       end
     end
+
+    def jbuilder(view_path, options = {})
+      raise NoMethodError.new('You can use Jbuilder support only in 1.9+') if RUBY_VERSION !~ /9/
+
+      jbuilder_data = Gon::Jbuilder.parse_jbuilder(view_path, options[:controller] || 
+                                                  @request_env['action_controller.instance'] || 
+                                                  @request_env['action_controller.rescue.response'].
+                                                    instance_variable_get('@template').
+                                                    instance_variable_get('@controller'))
+      if options[:as]
+        set_variable(options[:as].to_s, jbuilder_data)
+      elsif jbuilder_data.is_a? Hash
+        jbuilder_data.each do |key, value|
+          set_variable(key, value)
+        end
+      else
+        set_variable('jbuilder', jbuilder_data)
+      end
+    end
   end
 end

lib/gon/jbuilder.rb

@@ -0,0 +1,16 @@
+require 'jbuilder'
+
+module Gon::Jbuilder
+  class << self
+    def parse_jbuilder(jbuilder_path, controller)
+      source = File.read(jbuilder_path)
+      controller.instance_variables.each do |name|
+        self.instance_variable_set(name, controller.instance_variable_get(name))
+      end
+      output = JbuilderTemplate.encode(controller) do |json|
+        eval source
+      end
+      JSON.parse(output)
+    end
+  end
+end