nl_tokens: Get the file status code
pl_tokens: function fileStatus ( prev , stat , filename , dir , fn ) { var fullname = path . join ( dir , filename ) // is a deleted file?
   /*if (!fs.existsSync(fullname)) {
      return fn && fn(null, { stats: undefined, code: -1});
    }*/ // is a file added?
   if ( prev === undefined || prev === null ) { fn && fn ( null , { stats : { mtime : stat . mtime , <mask> : stat . size } , code : 1 } ) ; return ; } var mtimeChange = stat . mtime . valueOf ( ) != prev . stats . mtime . valueOf ( ) ; var sizeChange = stat . size != prev . stats . size ; // has changes ?
   if ( ! mtimeChange && ! sizeChange ) { return fn && fn ( null , { stats : { mtime : stat . mtime , size : stat . size } , code : 0 } ) ; } // the file has change
   fn && fn ( null , { stats : { mtime : stat . mtime , size : stat . size } , code : 2 } ) ; }