/**
  * Displays the number of committed files and the commit hash for commits.
  * @access public
  * @param  string $column The column to add.
  */
 public function custom_columns($column)
 {
     global $post;
     $post_id = get_the_ID();
     switch ($column) {
         case "hash":
             echo Revisr_Git::get_hash($post_id);
             break;
         case "branch":
             $branch_meta = get_post_meta($post_id, "branch");
             if (isset($branch_meta[0])) {
                 echo $branch_meta[0];
             }
             break;
         case "tag":
             $tag_meta = get_post_meta($post_id, "git_tag");
             if (isset($tag_meta[0])) {
                 echo $tag_meta[0];
             }
             break;
         case "files_changed":
             $files_meta = get_post_meta($post_id, "files_changed");
             if (isset($files_meta[0])) {
                 echo $files_meta[0];
             }
             break;
     }
 }