acquia_dam-1.0.0-rc1/js/ckeditor5_plugins/mediaRevisions/src/command.js

import { Command } from 'ckeditor5/src/core';
import {
  getClosestSelectedDrupalMediaElement,
  isDrupalMedia
} from './../../../../../../../core/modules/ckeditor5/js/ckeditor5_plugins/drupalMedia/src/utils'

export default class UpdateMediaRevisionCommand extends Command {

  refresh() {
    const { editor } = this;
    const { selection } = editor.model.document;
    let selectedElement = selection.getSelectedElement();
    if (!selectedElement) {
      selectedElement = getClosestSelectedDrupalMediaElement(selection)
    }

    this.isEnabled = isDrupalMedia(selectedElement)
      && selectedElement.hasAttribute('entityIsLatestRevision')
      && !selectedElement.getAttribute('entityIsLatestRevision');

  }
  execute(options = {}) {
    const { entityRevision } = options
    const { editor } = this;
    editor.model.change((writer) => {
      const element = editor.model.document.selection.getSelectedElement();
      writer.setAttribute('entityRevision', entityRevision, element)
    });
  }

}