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Re: ISO 2022 in terminals

From: Tim Allen
Subject: Re: ISO 2022 in terminals
Date: Sat, 5 Feb 2011 17:08:42 +1100
User-agent: Mutt/1.5.20 (2009-06-14)

On Sat, Feb 05, 2011 at 12:31:36AM -0500, Keith Winstein wrote:
> On Fri, 4 Feb 2011, Tim Allen wrote:
> >If you're willing to settle for merely not having to implement ISO 2022
> >yourself, rather than erasing it completely, have you tried luit?
> >
> >     http://invisible-island.net/luit/
> Hmm, one issue with luit is that it doesn't interpret Save Cursor
> and Restore Cursor (ESC 7 and ESC 8), which are supposed to save and
> restore the character set shift state.
> So adding luit to a "UTF-8 vt220 emulator" is not quite enough to
> look good in vttest.

That surprises me; as far as I know, xterm uses luit for its ISO 2022
implementation (at least in UTF-8 mode), and I'd be surprised if Thomas
released a version of xterm that didn't pass vttest.

I can't find a test in vttest labelled "Save and restore cursor", or
"ISO 2022", although I'm not terribly familiar with it. Can you point
out which tests fail with luit?

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