calendar.module

<?php
/**
 * @copyright 2017-2021 City of Bloomington, Indiana
 * @license https://www.gnu.org/licenses/old-licenses/gpl-2.0 GNU/GPL2, see LICENSE
 */
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\onboard\OnBoardService;

/**
 * @implements hook_help()
 */
function calendar_help($route_name, RouteMatchInterface $route_match)
{
    switch ($route_name) {
        case 'help.page.onboard':
            return "<h2>Google Calendar Help</h2>";
        break;
    }
}

/**
 * @implements hook_theme()
 * @see https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Render!theme.api.php/function/hook_theme/8.2.x
 */
function calendar_theme()
{
    return [
        'calendar_events'=> [
            'template'  => 'calendar_events',
            'variables' => [
                'events'     => [],
                'calendarId' => ''
            ]
        ],
        'calendar_event' => [
            'template'  => 'calendar_event',
            'variables' => [
                'event'      => [],
                'calendarId' => ''
            ]
        ]
    ];
}