How to Display full post or just excerpt using custom fields

Adding this snippet to the loop of your wordpress theme within single.php or index.php will let you use a custom field value to define if a post is displayed in full or just the excerpt.

<?php if (have_posts()) :
    while (have_posts()) : the_post();
         $customField = get_post_custom_values("full");
         if (isset($customField[0])) {
              the_title();
              the_content();
         } else {
              the_title();
              the_excerpt();
    endwhile;
endif;
?>