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.
Before this change the help for convmv was generated by running the
examples each time rclone started up. Unfortunately this involved
running the echo command which did not work on Windows.
This pre-generates the help into `transform.md` and embeds it. It can
be re-generated with `go generate` which is a better solution.
See: https://forum.rclone.org/t/invoke-of-1-70-0-complains-of-echo-not-found/51618
lib/transform adds the transform library, supporting advanced path name
transformations for converting and renaming files and directories by applying
prefixes, suffixes, and other alterations.
It also adds the --name-transform flag for use with sync, copy, and move.
Multiple transformations can be used in sequence, applied in the order they are
specified on the command line.
By default --name-transform will only apply to file names. The means only the leaf
file name will be transformed. However some of the transforms would be better
applied to the whole path or just directories. To choose which which part of the
file path is affected some tags can be added to the --name-transform:
file Only transform the leaf name of files (DEFAULT)
dir Only transform name of directories - these may appear anywhere in the path
all Transform the entire path for files and directories
Example syntax:
--name-transform file,prefix=ABC
--name-transform dir,prefix=DEF
