BuddyPress Activity as wire

bp-activity-wire-functions.php

 add_action('init', 'bdev_fix_activity_posting_hooks');

    function bdev_fix_activity_posting_hooks() {
        remove_action('wp_ajax_post_update', 'bp_dtheme_post_update');
    }

//add our own handler for activity posting

    add_action('wp_ajax_post_update', 'bp_mytheme_post_update');

    /* AJAX update posting */

    function bp_mytheme_post_update() {
        global $bp;

        /* Check the nonce */
        check_admin_referer('post_update', '_wpnonce_post_update');

        if (!is_user_logged_in()) {
            echo '-1';
            exit(0);
        }

        if (empty($_POST['content'])) {
            echo '-1<div id="message"><p>' . __('Please enter some content to post.', 'buddypress') . '</p></div>';
            exit(0);
        }

        if (empty($_POST['object']) && function_exists('bp_activity_post_update')) {

            //this is what I have changed

            if (!bp_is_home() && bp_is_member())
                $content = "@" . bp_get_displayed_user_username() . " " . $_POST['content'];
            else
                $content = $_POST['content'];

            //let us get the last activity id, we will use it to reset user's last activity
            $last_update = bp_get_user_meta(bp_loggedin_user_id(), 'bp_latest_update', true);


            $activity_id = bp_activity_post_update(array('content' => $content));

                //reset the last update 

            bp_update_user_meta(bp_loggedin_user_id(), 'bp_latest_update', $last_update);

            //end of my changes
        } elseif ($_POST['object'] == 'groups') {
            if (!empty($_POST['item_id']) && function_exists('groups_post_update'))
                $activity_id = groups_post_update(array('content' => $_POST['content'], 'group_id' => $_POST['item_id']));
        } else
            $activity_id = apply_filters('bp_activity_custom_update', $_POST['object'], $_POST['item_id'], $_POST['content']);

        if (!$activity_id) {
            echo '-1<div id="message"><p>' . __('There was a problem posting your update, please try again.', 'buddypress') . '</p></div>';
            exit(0);
        }

        if (bp_has_activities('include=' . $activity_id)) :
            ?>
        <?php while (bp_activities()) : bp_the_activity(); ?>
            <?php locate_template(array('activity/entry.php'), true) ?>
        <?php endwhile; ?>
    <?php
    endif;
    exit(0);
}