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Date: Fri, 20 Aug 2010 14:28:23 +0200
From: Vincent Lefevre <vincent@vinc17.net>
To: zsh-workers@zsh.org
Subject: prompt problem
Message-ID: <20100820122823.GA4702@ypig.lip.ens-lyon.fr>
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User-Agent: Mutt/1.5.20-6127-vl-r38670 (2010-08-14)

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)