From: DervishD <zsh@dervishd.net>
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Zsh Users <zsh-users@sunsite.dk>
Subject: Re: About zsh-users 8489 (exception handling)
Date: Wed, 28 Sep 2005 10:43:45 +0200 [thread overview]
Message-ID: <20050928084345.GB1384@DervishD> (raw)
In-Reply-To: <1050928024249.ZM23758@candle.brasslantern.com>
Hi Bart :)
You came to the rescue, as always ;)
* Bart Schaefer <schaefer@brasslantern.com> dixit:
> On Sep 28, 1:47am, DervishD wrote:
> :
> : In zsh-users 8489 Bart Schaeffer proposes using this syntax:
> :
> : { ${:?THROW} } 2>/dev/null
> :
> : Unfortunately, that doesn't work because ${:?...} *exits* from
> : the shell
> Not in an interactive shell, it doesn't. However ...
But I use (or will use) throw mainly in scripts, and that makes
the script to exit. And probably the 90% of throw/catch usage will
take place in scripts, not in interactive shells...
> : Is there any other way of generating an error (the exception) without
> : using a subshell and without using current invalid syntax that could
> : become valid in the future?
>
> Yes. If you declare (at the top of the throw function)
>
> readonly THROW
>
> then
>
> THROW= 2>/dev/null
>
> causes the error, which can be caught with "always". You don't even
> need the extra layer of { }. I like this a lot, because it uses only
> valid syntax that is pretty much guaranteed always to remain valid.
That's VERY clever, dude :))) I like this solution a lot :)
> I think EXCEPTION should also be declared with "typeset -g", so that
> makes the complete function look like:
But the function will work correctly even without "typeset -g",
wouldn't it? Wouldn't be needed "typeset -g" in "catch" too for the
CAUGHT parameter?
Thanks a lot for your answer :)
Raúl Núñez de Arenas Coronado
--
Linux Registered User 88736 | http://www.dervishd.net
http://www.pleyades.net & http://www.gotesdelluna.net
It's my PC and I'll cry if I want to...
next prev parent reply other threads:[~2005-09-28 8:43 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-27 23:47 DervishD
2005-09-28 2:42 ` Bart Schaefer
2005-09-28 8:43 ` DervishD [this message]
2005-09-28 15:18 ` Bart Schaefer
2005-09-29 10:31 ` DervishD
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