include_tag

# File actionpack/lib/action_view/helpers/asset_tag_helpers/asset_include_tag.rb, line 41
        def include_tag(*sources)
          options = sources.extract_options!.stringify_keys
          concat  = options.delete("concat")
          cache   = concat || options.delete("cache")
          recursive = options.delete("recursive")

          if concat || (config.perform_caching && cache)
            joined_name = (cache == true ? "all" : cache) + ".#{extension}"
            joined_path = File.join((joined_name[/^#{File::SEPARATOR}/] ? config.assets_dir : custom_dir), joined_name)
            unless config.perform_caching && File.exists?(joined_path)
              write_asset_file_contents(joined_path, compute_paths(sources, recursive))
            end
            asset_tag(joined_name, options)
          else
            sources = expand_sources(sources, recursive)
            ensure_sources!(sources) if cache
            sources.collect { |source| asset_tag(source, options) }.join("\n").html_safe
          end
        end