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Date: Tue, 7 Sep 2010 21:26:17 +0200
From: Vincent Lefevre <vincent@vinc17.net>
To: zsh-workers@zsh.org
Subject: Re: prompt problem
Message-ID: <20100907192617.GA22081@prunille.vinc17.org>
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References: <20100820122823.GA4702@ypig.lip.ens-lyon.fr>
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User-Agent: Mutt/1.5.20-6134-vl-r38670 (2010-08-25)

Any news?

On 2010-08-20 14:28:23 +0200, Vincent Lefevre wrote:
> After a "zsh -f", source the following:
> 
> precmd()
> {
>   psvar[1]=$?
>   if [[ $psvar[1] -gt 128 ]] then
>     local sig=$signals[$(($psvar[1]-127))]
>     [[ -n $sig ]] && psvar[1]=$sig
>   fi
> }
> 
> TRAPCLD() { [[ -o interactive && -n $TTY ]] && precmd }
> 
> PS1="%m:%20<...<%~%<<%(?..[%1v])%(#.#.>) "
> 
> then execute
> 
>   { sleep 3 } | { sleep 3 } | { sleep 3 } | { sleep 3 }
> 
> and interrupt it with Ctrl-C.
> 
> I can see two unexpected behaviors (not always reproducible, one
> needs to try several times), as seen here:
> 
> ypig:~[INT]> { sleep 3 } | { sleep 3 } | { sleep 3 } | { sleep 3 }
> ^C%
> ypig:~[INT]> { sleep 3 } | { sleep 3 } | { sleep 3 } | { sleep 3 }
> ^C%
> ypig:~[INT]> { sleep 3 } | { sleep 3 } | { sleep 3 } | { sleep 3 }
> ^C%
> ypig:~[INT]> { sleep 3 } | { sleep 3 } | { sleep 3 } | { sleep 3 }
> ^C%
> ypig:~[INT]> ypig:~[INT]> { sleep 3 } | { sleep 3 } | { sleep 3 } | { sleep 3 }
> ^C%
> ypig:~[INT]> { sleep 3 } | { sleep 3 } | { sleep 3 } | { sleep 3 }
> ^C%
> ypig:~[0]> { sleep 3 } | { sleep 3 } | { sleep 3 } | { sleep 3 }
> ^C%
> ypig:~[0]> { sleep 3 } | { sleep 3 } | { sleep 3 } | { sleep 3 }
> ^C%
> 
> So, sometimes the prompt is output twice. This seems to be a bug.
> 
> I sometimes get a "[0]" instead of "[INT]". This one may be due
> to the fact that $? is 0 in the trap. I wonder whether this is
> correct. At least the behavior doesn't seem to be consistent
> with:
> 
> ypig:~> sleep 5 &
> [1] 9217
> ypig:~> blah
> zsh: command not found: blah
> ypig:~[127]> 
> ypig:~[127]> 
> [1]  + done       sleep 5
> ypig:~[127]> 
> ypig:~[127]> echo $?
> 127
> 
> where the value of $? seems to be preserved after "sleep 5" has
> terminated.

-- 
Vincent Lefèvre <vincent@vinc17.net> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / Arénaire project (LIP, ENS-Lyon)