[PATCH] locale modifier @cjkwide

[Thomas Wolff <towo at towo dot net>]

I wrote yesterday:
> It had been discussed how to reflect ambiguous character widths in 
> cygwin locales, with the result of an implicit wide property assumed 
> for the CJK locales, and an overriding @cjknarrow modifier:
> https://sourceware.org/ml/cygwin/2009-06/msg00240.html
> https://sourceware.org/ml/cygwin/2009-06/msg00521.html
> https://sourceware.org/ml/cygwin/2009-06/msg00616.html
>
> Now I’m getting occasional complaints about mintty support for wide 
> display of certain symbol characters, particularly as used for some 
> fancy “Powerline” add-on, and it seems that other terminals apply 
> “ambiguous wide mode” (e.g. xterm -cjk_width) in order to enable 
> Powerline.
> While mintty has an option Charwidth=ambig-wide meanwhile, using this 
> option clearly has the drawback that it makes character width handling 
> inconsistent with the locale model as used by wcwidth.
> Actually for mintty, the desired behaviour can be achieved in a 
> locale-consistent way by selecting one of the CJK locales for LC_CTYPE;
> that’s not what most people would expect, however, and if they do it 
> the easy way, using LANG or LC_ALL, they are baffled by also getting
> their message language obscured.
> So I would prefer the option to use ambiguous wide mode in combination 
> with non-CJK locales in a locale-compatible way.

So I suggest to revisit the proposal of another generic modifier, also 
for symmetry, which is @cjkwide applicable to non-CJK locales.
Patch attached.
Thomas

Attachment: 0001-locale-modifier-cjkwide.patch
Description: Text document