class Kramdown::Converter::Html

def add_syntax_highlighter_to_class_attr(attr)

Add the syntax highlighter name to the 'class' attribute of the given attribute hash. 
def add_syntax_highlighter_to_class_attr(attr)
  (attr['class'] = (attr['class'] || '') + " highlighter-#{@options[:syntax_highlighter]}").lstrip!
end