// TODO: works only once on a page
// requires JQuery
sS hAceEditor(S text, O... _) {
  //_ = html_massageAutofocusParam(_);
  optPar S name = "text";
  S id = "ace_" + name;
  
  ret div(htmlEncode2(text), params_stylePlus("display: none", paramsPlus(_, +id)))
    + hscriptsrc("https://botcompany.de/ace-builds/src-noconflict/ace.js")
    + hscriptsrc("https://botcompany.de/ace-builds/src-noconflict/ext-language_tools.js")
    + hhiddenWithIDAndName(name)
    + hscript(replaceDollarVars([[ {
      ace.require("ace/ext/language_tools");
      var editor = ace.edit($id);
      editor.setTheme("ace/theme/ambience");
      editor.getSession().setTabSize(2);
      editor.getSession().setUseSoftTabs(true);
      editor.getSession().setUseWrapMode(true);
      document.getElementById($id).style.fontSize='15px';
      editor.setOptions({
        enableBasicAutocompletion: true
      });
      
      var hiddenVal = document.getElementById($name);
      function updateHidden() {
        //hiddenVal.value = editor.getValue();
        var newVal = editor.getValue();
        if (hiddenVal.value != newVal)
          $(hiddenVal).val(newVal).trigger('change');
      }
      updateHidden();
      
      editor.session.on('change', updateHidden);

      var div = $("#" + $id);
      div.show();
      //editor.focus();
    } ]], id := jsQuote(id), name := jsQuote(name));
}

Began life as a copy of #1009277