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Re: Phil's prompt is not working when LANG is set to UTF-8

On Wednesday 13 February 2008, Andrey Borzenkov wrote:
> On Monday 11 February 2008, Peter Stephenson wrote:
> > 
> > On Mon, 11 Feb 2008 16:07:09 +0100
> > antho.charles@xxxxxxxxx wrote:
> > > I didn't have this problem on Debian etch, but it appears when I
> > > upgraded to lenny. It's the same problem: if I set LANG to a non utf8
> > > encoding (fr_FR instead of fr_FR.UTF-8), RPROMPT is good, otherwise
> > > it's partially on another line and the cusor is after RPROMPT.
> > > (cf. http://tinyurl.com/3xjeqt)
> > 
> > Sounds like it ought to be fairly reproducible, but it's not happening on
> > Fedora 8 (and it still sounds suspiciously like the shell is getting duff
> > information about the environment, though that's certainly not the only
> > possibility).  I've tried adding multibyte characters to the command line
> > and complicating the RPROMPT and even adding multibyte characters to that,
> > but it still works OK.
> > 
> > Are there any particular things on the command line, forms of RPROMPT etc.
> > etc. that show this up?  (We really need something that narrows this down.)
> > 
> I can reproduce it on Mandriva cooker with locale en_US.UTF-8 or ru_RU.UTF-8. 
> does not matter whether there are UTF-8 characters on the screen (at least, I 
> not sure whether there are - en_US.UTF-8 should not emit any non-ASCII strings 
> as far as I can tell).

Actually the problem seems to be that terminal description contains non-UTF-8 
conform characters.

{pts/0}% infocmp | grep acsc
{pts/0}% infocmp linux | grep acsc

the first one is for dtterm, the second - for linux console.

The prompt is using q, l, m, j, k - at least some of them have high bit set.

So something gets confused computing prompt width. I am not really sure
how to fix it except teaching zsh about ACS mode. Is there any curses function
that would return screen width of character string?

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