module ActionView::Helpers::OutputSafetyHelper

# => "

foo

bar

"
safe_join([raw("

foo

"), raw("

bar

")], raw("
"))

# => "

foo

<br /><p>bar</p>"
safe_join([raw("

foo

"), "

bar

"], "
")

safe, and the returned string is marked as HTML safe.
the supplied separator, are HTML escaped unless they are HTML
would return. The array is flattened, and all items, including
This method returns an HTML safe string similar to what Array#join

def safe_join(array, sep = $,)
  sep = ERB::Util.unwrapped_html_escape(sep)
  array.flatten.map! { |i| ERB::Util.unwrapped_html_escape(i) }.join(sep).html_safe
end