gistfile1.txt

add_action('wp_insert_post', 'wpexpo_on_publish');

function wpexpo_on_publish($post_id){
    if ( !wp_is_post_revision( $post_id ) ) {
        $post_status = get_post_status($post_id);
        if($post_status == 'publish' and (isset($_POST['original_publish']) and $_POST['original_publish'] == 'Publish')){
            //codes here
        }
    }
}