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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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3
lib/transform/gen_help.go
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@ -37,6 +37,9 @@ var commandList = []commands{
{command: "--name-transform replace=old:new", description: "Replaces occurrences of old with new in the file name."},
{command: "--name-transform date={YYYYMMDD}", description: "Appends or prefixes the specified date format."},
{command: "--name-transform truncate=N", description: "Truncates the file name to a maximum of N characters."},
{command: "--name-transform truncate_keep_extension=N", description: "Truncates the file name to a maximum of N characters while preserving the original file extension."},
{command: "--name-transform truncate_bytes=N", description: "Truncates the file name to a maximum of N bytes (not characters)."},
{command: "--name-transform truncate_bytes_keep_extension=N", description: "Truncates the file name to a maximum of N bytes (not characters) while preserving the original file extension."},
{command: "--name-transform base64encode", description: "Encodes the file name in Base64."},
{command: "--name-transform base64decode", description: "Decodes a Base64-encoded file name."},
{command: "--name-transform encoder=ENCODING", description: "Converts the file name to the specified encoding (e.g., ISO-8859-1, Windows-1252, Macintosh)."},