Split editor at cursor and return serialized mobiledoc for each side

split-at-cursor.js

// Splits the current editor at the cursor into two mobiledocs
function splitAtCursor(editor) {
  return editor.run(postEditor => {
    const splitSections = postEditor.splitSection(editor.cursor.offsets.head);
    const afterSection = splitSections[1];

    let currentSection = afterSection;
    let sectionsToMove = [afterSection];

    while (currentSection.next) {
      currentSection = currentSection.next;
      sectionsToMove.push(currentSection);
    }

    const newEditor = new self.ContentKit.Editor();
    // we need to render somwhere for newEditor.run to work
    newEditor.render(document.createElement('div'));

    newEditor.run(newPostEditor => {
      sectionsToMove.forEach(section => {
        postEditor.removeSection(section);
        newPostEditor.insertSectionAtEnd(section);
      });
    });

    return [
      editor.serialize(),
      newEditor.serialize()
    ]
  });
}