module Primer::ClassNameHelper

def class_names(*args)
  [].tap do |classes|
    args.each do |class_name|
      case class_name
      when String
        classes << class_name if class_name.present?
      when Hash
        class_name.each do |key, val|
          classes << key if val
        end
      when Array
        classes << class_names(*class_name).presence
      end
    end
    classes.compact!
    classes.uniq!
  end.join(" ")
end