module Primer::ClassNameHelper

def class_names(*args)
  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.uniq.join(" ")
end