module Fluent::PluginHelper

def helpers_internal(*snake_case_symbols)
  helper_modules = []
  snake_case_symbols.each do |name|
    begin
      helper_modules << Fluent::PluginHelper.const_get(name.to_s.split('_').map(&:capitalize).join)
    rescue NameError
      raise "Unknown plugin helper:#{name}"
    end
  end
  include(*helper_modules)
end