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by burntsushi 463 days ago
> fd does that for English only.

That's false. Counter-example:

    $ touch 'Δ'
    $ fd δ
    Δ
Your Turkish example doesn't work with `fd` because `fd` doesn't support specific locales or locale specific tailoring for case insensitive matching. It only supports what Unicode calls "simple case folding." It works for things far beyond English, as demonstrated above, but definitely misses some cases specific to particular locales.
1 comments
jandrese 463 days ago
Casefolding is a minefield once you extend past English. It is completely unsurprising to find problems with it in other languages.
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burntsushi 463 days ago
Yes. I'm the one who implemented the case folding the `fd` uses (via its regex engine).

See: https://github.com/rust-lang/regex/blob/master/UNICODE.md#rl...

And then Unicode itself for more discussion on the topic: https://unicode.org/reports/tr18/#Simple_Loose_Matches

TR18 used to have a Level 3[1] with the kind of locale-specific custom tailoring support found in GNU's implementation of POSIX locales, but it was so fraught that it was retracted completely some years ago.

[1]: https://unicode.org/reports/tr18/#Tailored_Support

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