Add singleton file_path method to contents resolved by include

lib/raml/node/template.rb

@@ -16,7 +16,7 @@ def interpolate(params)
 
     def clone_data
       # ugly but effective
-      Marshal.load Marshal.dump @value
+      Marshal.load Marshal.dump @value.dup
     end
 
     def interpolate_params(value, params)

lib/raml/parser.rb

@@ -35,7 +35,9 @@ def expand_includes_transform(cwd)
 
           if val.is_a? Raml::Parser::Include
             child_wd = expand_includes_working_dir cwd, val.path
+            path = val.path
             val      = val.content cwd
+            val.define_singleton_method(:file_path) { child_wd + "/" + path.split("/").last }
           end
 
           expand_includes val, child_wd

test/raml/parser_spec.rb

@@ -36,7 +36,13 @@
         root.schemas['Test'      ].value.should eq 'test_schema'
         root.schemas['File'      ].value.should eq 'file_schema'
       end
-
+
+      it "inserts singleton method to read the file_path" do
+        file = File.new 'fixtures/include_1.raml'
+        root = Raml::Parser.parse file.read, 'fixtures'
+        root.schemas['FileUpdate'].value.file_path.should eq 'fixtures/schemas/filesystem/fileupdate.json'
+      end
+
       context 'when the included file is not redable' do
         it do
           expect { Raml::Parser.parse('- !include does_not_exit') }.to raise_error Raml::CantIncludeFile