public function postTypeSettings()
    {
        // Add section
        add_settings_section(
            'olympus-permalinks',
            Translate::t('posttypehook.custom_permalinks'),
            [&$this,'postTypeSettingTitle'],
            'permalink'
        );

        // Flush all rewrite rules
        if (isset($_POST['flushpermalink'])) {
            flush_rewrite_rules();
        }

        // Special case: do not change post/page component
        if (in_array($this->slug, $this->reserved_slugs)) {
            return false;
        }

        // Option
        $opt = 'permalink_structure_'.$this->slug;

        // Check POST
        if (isset($_POST[$opt])) {
            $value = $_POST[$opt];
            Option::set($opt, $value);
        } else {
            $value = Option::get($opt, '/%'.$this->slug.'%-%post_id%');
        }

        // Define metabox title
        $title = $this->name.' <code>%'.$this->slug.'%</code>';

        // Add fields
        add_settings_field(
            $opt,
            $title,
            [$this, 'postTypeSettingFunc'],
            'permalink',
            'olympus-permalinks',
            [
                'name' => $opt,
                'value' => $value,
            ]
        );

        return true;
    }