How to add a shortcode to call a function

Question

I'm using Cimy User Extra Fields to add more registration fields. I'm also using Contact Form 7 Dynamic Text Extension to pre-populate contact form fields.

I've read, in order to be able to use Cimy fields to pre-populate the contact form i need to add a shortcode. I've read this here.

He say's that you have to add a shortcode which calls a function that is in Cimy User Extra Fields.

The function in Cimy is called get_cimyFieldValue().

Here is the code he is referring to from Dynamic Text Extension.

function cf7_get_current_user($atts){
    extract(shortcode_atts(array(
        'key' => 'user_login',
    ), $atts));

    global $current_user;
    get_currentuserinfo();

    $val = $current_user->$key;
    return $val;
}
add_shortcode('CF7_get_current_user', 'cf7_get_current_user');

How can i add a shortcode in my functions.php to call get_cimyFieldValue() so i can populate the contact form with fields from Cimy?

Thanks

EDIT:

From the answer below i've managed to get this to work however it only seems to work if i use a user id. I need it to work with the current user not a predefined user.

Answer 1

So you're just looking for a simple shortcode that will call an existing function?

The following will create the shortcode you're looking for, but admittedly I haven't tested it with the Cimy User Extra Fields plugin. Add this to functions.php and try it out:

function shortcode_cimyFieldValue( $atts ) {

    global $current_user;
    $user_id = ( is_user_logged_in() ? $current_user->ID : NULL );

    /* 
     * First, check to make sure the get_cimyFieldValue() function
     * exists. This way, if the plugin is not installed the site
     * doesn't blow up...
     */
    if( function_exists( 'get_cimyFieldValue' ) ) {

        // Grab the shortcode parameters
        extract( shortcode_atts( array( 
            'user'  => $user_id,
            'field' => '',
            'value' => ''
        ), $atts ));

        /* 
         * Call the get_cimyFieldValue() function using any of the
         * user-entered parameters
         */
        if( $user_id != NULL ) {
            return get_cimyFieldValue( $user, $field, $value );
        }
    }
}

// Adds the above function as as shortcode
add_shortcode( 'my_cimy_field', 'shortcode_cimyFieldValue' );

This should allow you to call the shortcode [my_cimy_field] in either of the following ways:

[my_cimy_field field="my_field_name"]

or

[my_cimy_field field="my_field_name" value="Sample Field Value"]