def render_erb
      renderer = ERB.new(template_content, nil, '-')
      renderer.filename = @template_file
      renderer.result(binding)
    end
def render_erb
      renderer = ERB.new(template_content, nil, '-')
      renderer.filename = @template_file
      renderer.result(binding)
    end
Renders the content of the template file as an ERB template.

 @return [String] The rendered template.

 @raise (see #template_content)

 @api private