func()

in oss/lib/cp.go [1775:1856]
69 lines of code
20 McCabe index (conditional complexity)

func (cc *CopyCommand) getFileListStatistic(dpath string) error {
	if cc.cpOption.onlyCurrentDir {
		return cc.getCurrentDirFilesStatistic(dpath)
	}

	name := dpath
	symlinkDiretorys := []string{dpath}
	walkFunc := func(fpath string, f os.FileInfo, err error) error {
		if f == nil {
			return err
		}

		if !cc.filterPath(fpath, cc.cpOption.cpDir) {
			return nil
		}

		realFileSize := f.Size()
		dpath = filepath.Clean(dpath)
		fpath = filepath.Clean(fpath)
		fileName, err := filepath.Rel(dpath, fpath)
		if err != nil {
			return fmt.Errorf("list file error: %s, info: %s", fpath, err.Error())
		}

		if f.IsDir() {
			if fpath != dpath {
				cc.monitor.updateScanNum(1)
			}
			return nil
		}

		if cc.cpOption.disableAllSymlink && (f.Mode()&os.ModeSymlink) != 0 {
			return nil
		}

		// link file or link dir
		if f.Mode()&os.ModeSymlink != 0 {
			// there is difference between os.Stat and os.Lstat in filepath.Walk
			realInfo, err := os.Stat(fpath)
			if err != nil {
				return err
			}

			if realInfo.IsDir() {
				realFileSize = 0
			} else {
				realFileSize = realInfo.Size()
			}

			if cc.cpOption.enableSymlinkDir && realInfo.IsDir() {
				// it's symlink dir
				// if linkDir has suffix os.PathSeparator,os.Lstat determine it is a dir
				if !strings.HasSuffix(name, string(os.PathSeparator)) {
					name += string(os.PathSeparator)
				}
				linkDir := name + fileName + string(os.PathSeparator)
				symlinkDiretorys = append(symlinkDiretorys, linkDir)
				return nil
			}
		}
		if doesSingleFileMatchPatterns(f.Name(), cc.cpOption.filters) {
			cc.monitor.updateScanSizeNum(realFileSize, 1)
		}
		return nil
	}

	var err error
	for {
		symlinks := symlinkDiretorys
		symlinkDiretorys = []string{}
		for _, v := range symlinks {
			err = filepath.Walk(v, walkFunc)
			if err != nil {
				return err
			}
		}
		if len(symlinkDiretorys) == 0 {
			break
		}
	}
	return err
}