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