User defined shortcodes for default option

Thank you Takayuki for developing such an excellent and easy to use plugin.

I needed to call some of my own shortcodes to populate defaults beyond the built-in ones provided by CF7.

I have developed a workable solution that I currently use(described below), but unfortunately it modifies the plugin code.

Is there a way to add the functionality without hacking the code?

Steps to add user defined shortcodes in forms to populate defaults:

1. Modify function get_default_option in shortcodes.php by adding this fragment at the end of the if, elseif construct:

elseif ( 'shortcode' == substr( $opt, 0, 9 )) {
	$s = do_shortcode('[' . substr($opt,9) . ']');

	if ( $args['multiple'] ) {
		$values[] = $s;
	} else {
		return "$s";
	}
}

2. Add your functions & shortcodes in your theme functions.php
For example, this (useless) function retrieves a hard-coded phone number if the the user is logged in.

function get_user_phone()
{
    $tel = '';
    if (is_user_logged_in()) {
        $tel = '0207 3839 8892';
    }
    return $tel;
}

add_shortcode('user_phone', 'get_user_phone');

3. Call your shortcode in CF7 form to populate default this way:

<label> Your Phone (required)
    [text* your-phone default:shortcode:user_phone placeholder "Your Phone"] </label>

Thank you.

https://ww.wp.xz.cn/plugins/contact-form-7/