From: "Bart Schaefer" <schaefer@candle.brasslantern.com>
To: Mario Lang <mlang@home.delysid.org>
Cc: zsh-workers@sunsite.dk
Subject: Re: ZSpeak! Only Zsh can do this!
Date: Thu, 22 Mar 2001 06:52:23 +0000 [thread overview]
Message-ID: <1010322065223.ZM19693@candle.brasslantern.com> (raw)
In-Reply-To: <87zoefdor5.fsf@home.delysid.org>
On Mar 21, 6:18pm, Mario Lang wrote:
} Subject: Re: ZSpeak! Only Zsh can do this!
}
} Another really nice to have(tm) feature would be stdout buffering.
} What I mean is that the shell should have an array (much like history)
} which contains the outputs (stdout and stderr separated)
} from the last commands.
This amounts, approximately, to implementing the "less" pager in the
zsh C code. (The old, original "less" before it grew several million
bells and whistles, when it was mainly just a clever way of buffering
output so you could scroll backwards and forwards through it.)
The difficulty with doing this is that a surprisingly large number of
commands do pay attention to whether their standard output is a pipe
or a file or a terminal. For the shell to capture the outputs means
that the output of every command is _always_ a pipe. It simply does
not work (see my remarks on the problems of using multios with `exec').
However ... it might be possible to construct something based on the
zpty module, where stdout and stderr would (unless redirected) each go
to a separate pty, and both ptys would be managed by a front-end that
slurped up the output from each as it appeared. That such a thing is
possible is evidenced by the `screen' tty windowing program, which
actually might be a better starting point than zsh for such a project.
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net
next prev parent reply other threads:[~2001-03-22 6:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-03-19 10:07 Sven Wischnowsky
2001-03-21 17:18 ` Mario Lang
2001-03-22 6:52 ` Bart Schaefer [this message]
2001-03-23 8:42 ` Bart Schaefer
-- strict thread matches above, loose matches on Subject: below --
2001-03-16 14:21 Mario Lang
2001-03-16 14:39 ` Peter Stephenson
2001-03-16 18:23 ` Bart Schaefer
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