[mosh-users] Alternate character set support (line grpahics) with terminfo

[Keith Winstein]

Try this to get a real "traditional" xterm:

xterm +k8 +lc -en C -xrm 'XTerm*locale: false' -xrm 'XTerm*utf8: false' -e
'echo -e "\x9b44mHello... \x9b0;1m\x9b30Cworld!"; sleep 10'

If this conversation goes off into a long tangent about X resources and
*their* pathologies, it will make my Thursday!

Cheers,
Keith

On Thu, Mar 20, 2014 at 4:50 PM, Vincent Lefevre <vincent-mosh at vinc17.net>wrote:

> On 2014-03-20 16:17:37 +0100, Keith Winstein wrote:
> > Unfortunately, old programs were already broken by the switch from
> > octet-based ANSI terminal emulators to UTF-8-based ANSI terminal
> emulators.
> > The switch to UTF-8 was a breaking change to the terminal control
> language.
>
> I don't think so. Well, not in a significant way in practice.
>
> > Compare:
> >
> > LC_ALL=C xterm -e 'echo -e "\x9b44mHello... \x9b0;1m\x9b30Cworld!"; sleep
> > 10'
> >
> > [image: Inline image 1]
> >
> > (The "LC_ALL=C" puts xterm in old-fashioned octet-based mode.)
> >
> > to the same command, run in a UTF-8 terminal emulator:
> >
> > LC_ALL=en_US.UTF-8 xterm -e 'echo -e "\x9b44mHello...
> > \x9b0;1m\x9b30Cworld!"; sleep 10'
> >
> > [image: Inline image 2]
>
> On my machine there are just cosmetic differences.
> See attached images.
>
> > The escape sequence (using C1 CSI) works fine in an "original" xterm, but
> > the switch to UTF-8 breaks this application.
>
> I think that they are disabled in my xterm, as they are useless in
> practice. IIRC, I had problems with them even in the pre-UTF-8 time,
> because these code points were used by Microsoft so that one could
> find them in text files in practice, and interpreting them as
> control characters was a bad idea.
>
> --
> Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
> 100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
> Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
>
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