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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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6
lib/transform/transform_test.go
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@@ -128,6 +128,12 @@ func TestVarious(t *testing.T) {
{"stories/The Quick Brown 🦊 Fox Went to the Café!.txt", "stories/The Quick Brown _ Fox Went to the Caf_!.txt", []string{"all,charmap=ISO-8859-7"}},
{"stories/The Quick Brown Fox: A Memoir [draft].txt", "stories/The Quick Brown Fox： A Memoir ［draft］.txt", []string{"all,encoder=Colon,SquareBracket"}},
{"stories/The Quick Brown 🦊 Fox Went to the Café!.txt", "stories/The Quick Brown 🦊 Fox", []string{"all,truncate=21"}},
{"stories/Вот русское предложение, в котором байтов больше, чем символов.txt", "stories/Вот русское предложение, в котором байтов больше, чем символов.txt", []string{"truncate=70"}},
{"stories/Вот русское предложение, в котором байтов больше, чем символов.txt", "stories/Вот русское предложение, в котором байтов больше, чем символ", []string{"truncate=60"}},
{"stories/Вот русское предложение, в котором байтов больше, чем символов.txt", "stories/Вот русское предложение, в котором байтов больше, чем символов.txt", []string{"truncate_bytes=300"}},
{"stories/Вот русское предложение, в котором байтов больше, чем символов.txt", "stories/Вот русское предложение, в котором бай", []string{"truncate_bytes=70"}},
{"stories/Вот русское предложение, в котором байтов больше, чем символов.txt", "stories/Вот русское предложение, в котором байтов больше, чем си.txt", []string{"truncate_keep_extension=60"}},
{"stories/Вот русское предложение, в котором байтов больше, чем символов.txt", "stories/Вот русское предложение, в котором б.txt", []string{"truncate_bytes_keep_extension=70"}},
{"stories/The Quick Brown Fox!.txt", "stories/The Quick Brown Fox!.txt", []string{"all,command=echo"}},
{"stories/The Quick Brown Fox!.txt", "stories/The Quick Brown Fox!.txt-" + time.Now().Local().Format("20060102"), []string{"date=-{YYYYMMDD}"}},
{"stories/The Quick Brown Fox!.txt", "stories/The Quick Brown Fox!.txt-" + time.Now().Local().Format("2006-01-02 0304PM"), []string{"date=-{macfriendlytime}"}},