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Re: Bang completion kills zsh in emacs process buffer


zsh thinks that it's an interactive shell because emacs invokes it with
the -i option.


On Fri, 19 Sep 2003 17:18:23 +0100, "Peter Stephenson" <pws@xxxxxxx>
> "Dwight Shih" wrote:
> >  To reproduce:
> >   start emacs
> >   M-x shell
> >  $ pwd
> >  $ echo !$      #zsh will now die
> >
> >  In the debugger, zsh dies at hist.c:1092 trying to do a zputs(prt,shout)
> >  because the file pointer shout is null.
> The confusion comes because somehow zsh thinks it's non-interactive but
> is still using history --- which is basically what you said.
> It surprises me a bit that it's trying to use bang-history at all in this
> case.  It's usually turned off non-interactively.  Ideally we need to
> track down why it's doing that.  I can't seem to reproduce it --- partly
> because shell mode is stealing my !'s for some purpose of its own I can
> only guess at, which indicates some of the reasons I never use Emacs
> shell mode.
> It might help to see the options it has set; the options related to
> interactive or non-interactive operations are interactive, shinstdin and
> monitor.  This is the code in hbegin which I think should be stopping it
> using history for non-interactive shells:
>     else if (dohist != 2)
> 	stophist = (!interact || unset(SHINSTDIN)) ? 2 : 0;
> (interact is a definition for isset(INTERACTIVE); it would be much
> clearer and hardly longers to use the latter throughout.  Possibly it
> used to mean something else.)
> So stophist should be 2 in this case (we should use enums for this sort
> of flag but this code goes back to the dawn of time).  If you feel
> inclined to track this down (which would be much appreciated), finding
> out if stophist is getting set to 2, and if it is why we are doing
> bang-history anyway, would be a good path to take.
> Testing for shout != NULL in hist.c is an entirely benign workaround if
> no-one is able to find out why it's using history at all, but I don't
> think it's the root of the problem.
> -- 
> Peter Stephenson <pws@xxxxxxx>                  Software Engineer
> CSR Ltd., Science Park, Milton Road,
> Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070
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