From: Stephane Chazelas <Stephane_Chazelas@yahoo.fr>
To: Peter Stephenson <pws@csr.com>
Cc: Rocky Bernstein <rocky.bernstein@gmail.com>,
Zsh hackers list <zsh-workers@sunsite.dk>
Subject: Re: DEBUG_CMD_LINE (Was Re: PATCH: skip command from debug trap)
Date: Thu, 7 Aug 2008 10:31:40 +0100 [thread overview]
Message-ID: <20080807093139.GA6839@sc.homeunix.net> (raw)
In-Reply-To: <20080807095441.3058605d@news01>
On Thu, Aug 07, 2008 at 09:54:41AM +0100, Peter Stephenson wrote:
[...]
> It would be possible with a bit of fiddling to get the DEBUG trap to happen
> at the level of elements of a sublist, i.e. commands separated by && and
> ||, but I'm not sure if that's worth it. Beyond that you run into the
> hideous complexity of pipelines and I don't think it can be pushed that far
> down.
[...]
But see how PS4 is expanded for every command:
$ zsh -o PROMPT_SUBST -c 'PS4="\$(od -vAn -N2 -x /dev/urandom) "
set -x; : a | : b; : c && : d'
4542 : a
e866 : b
a7ad : c
6051 : d
BTW, shouldn't PROMPT_SUBST be enabled by default in sh and ksh
emulation?
Is there a way to run shell code (other than assignments and
arithmetic expansion) upon the expansion of PS4? I thought of
/(e:code:), but in scalar context I couldn't find a way for
globbing to be performed.
--
Stéphane
next prev parent reply other threads:[~2008-08-07 9:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-06 21:19 Rocky Bernstein
2008-08-07 8:54 ` Peter Stephenson
2008-08-07 9:31 ` Stephane Chazelas [this message]
2008-08-07 10:14 ` Peter Stephenson
2008-08-07 10:40 ` Stephane Chazelas
2008-08-07 12:06 ` Peter Stephenson
2008-08-07 13:37 ` Rocky Bernstein
2008-08-07 15:10 ` Bart Schaefer
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