def _output_filename(file)
      sub_strings           = File.basename(file).split('.')
      base_name, extensions = sub_strings.first, sub_strings[1..-1]

      if extensions.last == 'haml'
        extensions.pop
        if extensions.empty?
          [base_name, options[:default_ext]].join('.')
        else
          [base_name, extensions].flatten.join('.')
        end
      else
        [base_name, extensions, options[:default_ext]].flatten.compact.join('.')
      end
    end
def _output_filename(file)
      sub_strings           = File.basename(file).split('.')
      base_name, extensions = sub_strings.first, sub_strings[1..-1]

      if extensions.last == 'haml'
        extensions.pop
        if extensions.empty?
          [base_name, options[:default_ext]].join('.')
        else
          [base_name, extensions].flatten.join('.')
        end
      else
        [base_name, extensions, options[:default_ext]].flatten.compact.join('.')
      end
    end
Generate a file name based on the provided file path.
 Provide a logical extension.

 Examples:
   "path/foo.haml"     -> "foo.html"
   "path/foo"          -> "foo.html"
   "path/foo.bar"      -> "foo.bar.html"
   "path/foo.bar.haml" -> "foo.bar"

 @param file String path to file
 @return String file name including extension