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transform: add truncate_keep_extension and truncate_bytes

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This change adds a truncate_bytes mode which counts the number of bytes, as
opposed to the number of UTF-8 characters. This can be useful for ensuring that a
crypt-encoded filename will not exceed the underlying backend's length limits
(see https://forum.rclone.org/t/any-clear-file-name-length-when-using-crypt/36930 ).

This change also adds support for _keep_extension when using truncate and
truncate_bytes.
This commit is contained in:
nielash
2025-06-24 22:49:52 -04:00
committed by Nick Craig-Wood
parent d6ecb949ca
commit fe62a2bb4e
4 changed files with 112 additions and 38 deletions
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70
lib/transform/options.go
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@ -159,6 +159,12 @@ func (t *transform) requiresValue() bool {
return true
case ConvTruncate:
return true
case ConvTruncateKeepExtension:
return true
case ConvTruncateBytes:
return true
case ConvTruncateBytesKeepExtension:
return true
case ConvEncoder:
return true
case ConvDecoder:
@ -190,6 +196,9 @@ const (
ConvIndex
ConvDate
ConvTruncate
ConvTruncateKeepExtension
ConvTruncateBytes
ConvTruncateBytesKeepExtension
ConvBase64Encode
ConvBase64Decode
ConvEncoder
@ -211,35 +220,38 @@ type transformChoices struct{}
func (transformChoices) Choices() []string {
return []string{
ConvNone: "none",
ConvToNFC: "nfc",
ConvToNFD: "nfd",
ConvToNFKC: "nfkc",
ConvToNFKD: "nfkd",
ConvFindReplace: "replace",
ConvPrefix: "prefix",
ConvSuffix: "suffix",
ConvSuffixKeepExtension: "suffix_keep_extension",
ConvTrimPrefix: "trimprefix",
ConvTrimSuffix: "trimsuffix",
ConvIndex: "index",
ConvDate: "date",
ConvTruncate: "truncate",
ConvBase64Encode: "base64encode",
ConvBase64Decode: "base64decode",
ConvEncoder: "encoder",
ConvDecoder: "decoder",
ConvISO8859_1: "ISO-8859-1",
ConvWindows1252: "Windows-1252",
ConvMacintosh: "Macintosh",
ConvCharmap: "charmap",
ConvLowercase: "lowercase",
ConvUppercase: "uppercase",
ConvTitlecase: "titlecase",
ConvASCII: "ascii",
ConvURL: "url",
ConvRegex: "regex",
ConvCommand: "command",
ConvNone: "none",
ConvToNFC: "nfc",
ConvToNFD: "nfd",
ConvToNFKC: "nfkc",
ConvToNFKD: "nfkd",
ConvFindReplace: "replace",
ConvPrefix: "prefix",
ConvSuffix: "suffix",
ConvSuffixKeepExtension: "suffix_keep_extension",
ConvTrimPrefix: "trimprefix",
ConvTrimSuffix: "trimsuffix",
ConvIndex: "index",
ConvDate: "date",
ConvTruncate: "truncate",
ConvTruncateKeepExtension: "truncate_keep_extension",
ConvTruncateBytes: "truncate_bytes",
ConvTruncateBytesKeepExtension: "truncate_bytes_keep_extension",
ConvBase64Encode: "base64encode",
ConvBase64Decode: "base64decode",
ConvEncoder: "encoder",
ConvDecoder: "decoder",
ConvISO8859_1: "ISO-8859-1",
ConvWindows1252: "Windows-1252",
ConvMacintosh: "Macintosh",
ConvCharmap: "charmap",
ConvLowercase: "lowercase",
ConvUppercase: "uppercase",
ConvTitlecase: "titlecase",
ConvASCII: "ascii",
ConvURL: "url",
ConvRegex: "regex",
ConvCommand: "command",
}
}