code: func CalcLengths(buckets []*stack.Bucket, fullPath bool) (int, int) {
  	srcLen := 0
  	pkgLen := 0
  	for _, bucket := range buckets {
  		for _, line := range bucket.Signature.Stack.Calls {
  			l := 0
  			if fullPath {
  				l = len(line.FullSrcLine())
  			} else {
  				l = len(line.SrcLine())
  			}
  			if l > srcLen {
  				srcLen = l
  			}
  			l = len(line.Func.PkgName())
  			if l > pkgLen {
  				pkgLen = l
  			}
  		}
  	}
  	return srcLen, pkgLen
  }
docs: // CalcLengths returns the maximum length of the source lines and package names.