discourse/app/assets/javascripts/admin/components/admin-directory-toggle.js.es6

import { iconHTML } from 'discourse-common/lib/icon-library';
import { bufferedRender } from 'discourse-common/lib/buffered-render';

export default Ember.Component.extend(bufferedRender({
  tagName: 'th',
  classNames: ['sortable'],
  rerenderTriggers: ['order', 'ascending'],

  buildBuffer(buffer) {
    const icon = this.get('icon');

    if (icon) {
      buffer.push(iconHTML(icon));
    }

    buffer.push(I18n.t(this.get('i18nKey')));

    if (this.get('field') === this.get('order')) {
      buffer.push(iconHTML(this.get('ascending') ? 'chevron-up' : 'chevron-down'));
    }
  },

  click() {
    const currentOrder = this.get('order');
    const field = this.get('field');

    if (currentOrder === field) {
      this.set('ascending', this.get('ascending') ? null : true);
    } else {
      this.setProperties({ order: field, ascending: null });
    }
  }
}));