IE Conditional Comments HAML

application_helper.rb

# Implements the Paul Irish IE conditional comments HTML tag--in HAML.
# http://paulirish.com/2008/conditional-stylesheets-vs-css-hacks-answer-neither/
# http://ricostacruz.com/2010/haml_and_ie_compatibility.html
def cc_html(options={}, &blk)
  attrs = options.map { |(k, v)| " #{h k}='#{h v}'" }.join('')
  [ "<!--[if lt IE 7 ]> <html#{attrs} class='ie6'> <![endif]-->",
    "<!--[if IE 7 ]>    <html#{attrs} class='ie7'> <![endif]-->",
    "<!--[if IE 8 ]>    <html#{attrs} class='ie8'> <![endif]-->",
    "<!--[if IE 9 ]>    <html#{attrs} class='ie9'> <![endif]-->",
    "<!--[if (gt IE 9)|!(IE)]><!--> <html#{attrs}> <!--<![endif]-->",
    capture_haml(&blk).strip,
    "</html>"
  ].join("\n").html_safe
end