Haml + Coffeescript Tweet button and Like button

buttons.coffee

((d, s, id) ->
  js = undefined
  fjs = d.getElementsByTagName(s)[0]
  return  if d.getElementById(id)
  js = d.createElement(s)
  js.id = id
  js.src = "//connect.facebook.net/en_US/all.js#xfbml=1"
  fjs.parentNode.insertBefore js, fjs
) document, "script", "facebook-jssdk"

not ((d, s, id) ->
  js = undefined
  fjs = d.getElementsByTagName(s)[0]
  unless d.getElementById(id)
    js = d.createElement(s)
    js.id = id
    js.src = "//platform.twitter.com/widgets.js"
    fjs.parentNode.insertBefore js, fjs
) document, "script", "twitter-wjs"

buttons.html.haml

%a.twitter-share-button{"data-related" => "YourUserNameOnTwitter", "data-size" => "large", "data-text" => "I just tweeted about this site!", "data-via" => "YourUserNameOnTWitter", :href => "https://twitter.com/share"} Tweet

.fb-like{"data-action" => "like", "data-colorscheme" => "light", "data-layout" => "standard", "data-send" => "false", "data-show-faces" => "false", "data-width" => "450"}