trait DescriptionTemplateTrait

trait DescriptionTemplateTrait {
    
    /**
     * Generate a render array with our templated content.
     *
     * @return array
     *   A render array.
     */
    public function description() {
        $template_path = $this->getDescriptionTemplatePath();
        $template = file_get_contents($template_path);
        $build = [
            'description' => [
                '#type' => 'inline_template',
                '#template' => $template,
                '#context' => $this->getDescriptionVariables(),
            ],
        ];
        return $build;
    }
    
    /**
     * Name of our module.
     *
     * @return string
     *   A module name.
     */
    protected abstract function getModuleName();
    
    /**
     * Variables to act as context to the twig template file.
     *
     * @return array
     *   Associative array that defines context for a template.
     */
    protected function getDescriptionVariables() {
        $variables = [
            'module' => $this->getModuleName(),
        ];
        return $variables;
    }
    
    /**
     * Get full path to the template.
     *
     * @return string
     *   Path string.
     */
    protected function getDescriptionTemplatePath() {
        return \Drupal::service('extension.list.module')->getPath($this->getModuleName()) . '/templates/description.html.twig';
    }

}