Turns all urls into clickable links. If a block is given, each url is
yielded and the result is used as the link text.
# File actionpack/lib/action_view/helpers/text_helper.rb, line 543
def auto_link_urls(text, html_options = {})
link_attributes = html_options.stringify_keys
text.gsub(AUTO_LINK_RE) do
href = $&
punctuation = ''
left, right = $`, $'
# detect already linked URLs and URLs in the middle of a tag
if left =~ /<[^>]+$/ && right =~ /^[^>]*>/
# do not change string; URL is already linked
href
else
# don't include trailing punctuation character as part of the URL
if href.sub!(/[^\w\/-]$/, '') and punctuation = $& and opening = BRACKETS[punctuation]
if href.scan(opening).size > href.scan(punctuation).size
href << punctuation
punctuation = ''
end
end
link_text = block_given?? yield(href) : href
href = 'http://' + href unless href =~ %r{^[a-z]+://}i
content_tag(:a, h(link_text), link_attributes.merge('href' => href)) + punctuation
end
end
end
