Function transformPathSegment

lib/transform/transform.go:124–239

transformPathSegment transforms one path segment (or really any string) according to the chosen TransformAlgo. It assumes path separators have already been trimmed.

(s string, t transform)

// transformPathSegment transforms one path segment (or really any string) according to the chosen TransformAlgo.
// It assumes path separators have already been trimmed.
func transformPathSegment(s string, t transform) (string, error) {
	switch t.key {
	case ConvNone:
		return s, nil
	case ConvToNFC:
		return norm.NFC.String(s), nil
	case ConvToNFD:
		return norm.NFD.String(s), nil
	case ConvToNFKC:
		return norm.NFKC.String(s), nil
	case ConvToNFKD:
		return norm.NFKD.String(s), nil
	case ConvBase64Encode:
		return base64.URLEncoding.EncodeToString([]byte(s)), nil // URLEncoding to avoid slashes
	case ConvBase64Decode:
		if s == ".DS_Store" {
			return s, nil
		}
		b, err := base64.URLEncoding.DecodeString(s)
		if err != nil {
			fs.Errorf(s, "base64 error")
		}
		return string(b), err
	case ConvFindReplace:
		split := strings.Split(t.value, ":")
		if len(split) != 2 {
			return s, fmt.Errorf("wrong number of values: %v", t.value)
		}
		return strings.ReplaceAll(s, split[0], split[1]), nil
	case ConvPrefix:
		return t.value + s, nil
	case ConvSuffix:
		return s + t.value, nil
	case ConvSuffixKeepExtension:
		return SuffixKeepExtension(s, t.value), nil
	case ConvTrimPrefix:
		return strings.TrimPrefix(s, t.value), nil
	case ConvTrimSuffix:
		return strings.TrimSuffix(s, t.value), nil
	case ConvTruncate:
		max, err := strconv.Atoi(t.value)
		if err != nil {
			return s, err
		}
		return truncateChars(s, max, false), nil
	case ConvTruncateKeepExtension:
		max, err := strconv.Atoi(t.value)
		if err != nil {
			return s, err
		}
		return truncateChars(s, max, true), nil
	case ConvTruncateBytes:
		max, err := strconv.Atoi(t.value)
		if err != nil {
			return s, err
		}
		return truncateBytes(s, max, false)
	case ConvTruncateBytesKeepExtension: