gistfile1.rb

  def link_to url, text, options={}
    valid_options = [:class, :id]
    attributes = %Q{href="#{url}"}

    valid_options.each do |option|
      attributes = %Q{#{attributes} #{option.to_s}="#{options[option]}"} if options[option]
    end

    "<a #{attributes}>#{text}</a>"
  end

  def tweet_linkify text
    text.gsub(/(http:\/\/[a-zA-Z0-9_\-\/\.\?\&]+)/, link_to($1, $1)).gsub(/\@([a-zA-Z0-9_\-]+)/, %Q{@#{link_to("http://twitter.com/#{$1}", $1)}})
  end