var editor;
onload=function(){
  function getMode(filename){
    var ext = filename.split('.').pop();
    var prefix = "ace/mode/";
    if(!ext) return prefix + "text";

    switch (ext) {
    case "js":
      return prefix + "javascript";
    }
    return prefix + ext;
  }

  editor = ace.edit("editor");
  editor.setTheme("ace/theme/clouds");
  editor.setShowPrintMargin(false);
  editor.setOptions({
    enableBasicAutocompletion: true,
    enableSnippets: true,
    enableLiveAutocompletion: true
  });
  editor.session.setMode(getMode(location.href));
}