codex/app/views/note-edit.html

<div class="editor-container">
  <div ui-ace="{
    useWrapMode : true,
    showGutter: true,
    theme:'tomorrow_night_eighties',
    mode: 'markdown',
    firstLineNumber: 1,
    onLoad: aceLoaded,
    onChange: aceChanged
  }" ng-model="raw_data"></div>
</div>