Re: [PATCH] locale modifier @cjkwide

[Thomas Wolff <towo at towo dot net>]

Am 27.02.2018 um 15:58 schrieb Corinna Vinschen:
> Hi Thomas,
>
> On Feb 26 22:42, Thomas Wolff wrote:
> > 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
> Just one point:
> > ...
> > Subject: [PATCH] locale modifier @cjkwide
> It would be most helpful to get a v2 patch with a commit message
> describing why adding cjkwide makes sense, for later reference.
> The subject "locale modifier @cjkwide" is rather terse.
New patch attached. I'll also provide a patch for the Cygwin user guide, 
to cygwin-patches.
Thomas

Attachment: 0001-Locale-modifier-cjkwide-makes-Unicode-ambiguous-widt.patch
Description: Text document