[Tcsh] "Readable" Unicode in setenv

[Christos Zoulas]

> On Nov 15, 2021, at 9:34 AM, H.Merijn Brand <tcsh at tux.freedom.nl> wrote:
> 
> Signed PGP part
> On Mon, 15 Nov 2021 08:15:57 -0500, Christos Zoulas <christos at zoulas.com> wrote:
> 
>>> On Nov 14, 2021, at 8:29 AM, H.Merijn Brand <tcsh at tux.freedom.nl> wrote:
>>> 
>>> Signed PGP part
>>> On Sat, 13 Nov 2021 19:16:07 -0500, Christos Zoulas <christos at zoulas.com <mailto:christos at zoulas.com>> wrote:
>>> 
>>>> Committed, thanks!
>>> 
>>> Wow, thanks. Would it be hard(er) to also allow
>>> 
>>> % setenv EURO "\u20AC"
>>> 
>>> directly too instead of
>>> 
>>> % setenv EURO `echo "\u20AC"`
>>> 
>>> (you can also hint me to the location in/of the code and I'll play around myself)
>>> 
>> 
>> I am not sure... How do you enter a literal "\u20AC" then in the environment?
>> setenv EURO "\\u20AC"?
> 
> Use single quotes, but yeah, that might confuse Windows users
> 
> To me
> 
> % setenv EURO "\u20AC"
> % env | grep EURO		=> €
> 
> % setenv EURO '\u20AC'
> % env | grep EURO		=> \u20AC
> 
> would be intuitive, but I have a strong perl-background, so that might explain.
> 
>> Does not seem very intuitive to me. At least we have simple "output" semantics
>> here for echo. What would be the "input" semantics, and which commands do they
>> affect? I.e. does the translation happen for all variables on assignment? For all
>> literal strings present in csh code?
> 
> Yes, for all double-quoted literal strings in csh code (maybe that could be an option)
> No,  for all single-quoted literal strings in csh code
> 
> braindump:
> 
> % set literal_escapes=U
> "\u20AC"   => €
> "\x{20AC}" => \x{20AC}
> "\101"     => \101
> 
> % set literal_escapes=X
> "\u20AC"   => \u20AC
> "\x{20AC}" => €
> "\101"     => \101
> 
> % set literal_escapes=UXO
> "\u20AC"   => €
> "\x{20AC}" => €
> "\101"     => A

That is perhaps workable, but how about:

set x=\\u20AC

I mean, quotes are optional for strings in shell, and that makes life complicated :-)

christos

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