From: Zach Riggle <zachriggle@gmail.com>
To: Bart Schaefer <schaefer@brasslantern.com>
Cc: Zsh Users <zsh-users@zsh.org>
Subject: Re: Accessing the evaluated expression which caused an error
Date: Fri, 3 Sep 2021 12:38:12 -0500 [thread overview]
Message-ID: <CAMP9c5ncfwHjWMaFuf=u6WhvNiN_UqMMArxtmHt4A+HqFMN0NA@mail.gmail.com> (raw)
In-Reply-To: <CAH+w=7aT6rgWDnfr0A=j7nrv2PjQMDJddefRhTg_VrmU2YF_6w@mail.gmail.com>
> What exactly might you want captured?
Very frequently I build a create an array that contains a command, e.g.
declare -a cmd=( echo hello world )
And invoke it like:
"${cmd[@]}"
When I xtrace, it will print out the values inside the array.
+wat.sh:2> cmd=( echo hello world )
+wat.sh:3> echo hello world
With TRAPDEBUG or TRAPERR, all I get is the "${cmd[@]}". None of the
Zsh-supplied arrays (funcfilesource etc.) contain that. I originally
had some hope that $_ would work, but it appears not to.
Zach Riggle
On Fri, Sep 3, 2021 at 12:14 PM Bart Schaefer <schaefer@brasslantern.com> wrote:
>
> On Thu, Sep 2, 2021 at 6:43 PM Zach Riggle <zachriggle@gmail.com> wrote:
> >
> > I'm aware of funcsourcetrace, funcstack, and TRAPDEBUG /
> > ZSH_DEBUG_CMD as well, but none of these contain the actual expression
> > evaluated -- just the input to zsh.
> >
> > I know that zsh has the data internally, since "zsh -x" shows the
> > fully-evaluated expression, so that data must be available somewhere,
> > even if it's not exposed in a shell variable.
>
> Hm. What xtrace does is dump each individual shell word ... it just
> happens to dump them in the order that puts them together as an
> "expression". But you'll notice it's not actually an expression, it's
> just e.g. a single simple command. In fact it's even a bit weird for
> some structured commands (look at the output for a "case" statement
> for example).
>
> It's correct that none of this is captured in any sort of format that
> would be usable by a shell script. It never exists all at once in
> such a format internally.
>
> What exactly might you want captured?
next prev parent reply other threads:[~2021-09-03 17:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-03 1:42 Zach Riggle
2021-09-03 17:14 ` Bart Schaefer
2021-09-03 17:38 ` Zach Riggle [this message]
2021-09-04 20:08 ` Bart Schaefer
2021-09-05 0:26 ` Zach Riggle
2021-09-05 1:44 ` Lawrence Velázquez
2021-09-05 2:08 ` Bart Schaefer
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