code: function buildMap( map, part ){
  
      var name =          makeName( part.fileName );
  
      if ( map[name] ){
          map[name].parts.push( part );
      } else {
          map[name] = {
              name:       name,
              parts:      [ part ],
          };
      }
  
      return map;
  }
docs: / / Private functions ----------------------------------------------------------