-C -like option to change CWD on startup

-C -like option to change CWD on startup

[Sebastian Gniazdowski]

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Hi,
make and git have the -C option which works like:
(
   builtin cd -q $COPT
   git/make "$@"
)

I think that it is very useful, because no lengthy subshell is needed. Zsh
doesn't have such option, could it be added? It's pitty that -C is already
used by NO_CLOBBER, but maybe some other letter is free (I didn't found
any)?

-- 
Best regards,
Sebastian Gniazdowski

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Re: -C -like option to change CWD on startup

[Roman Perepelitsa]

On Thu, Feb 2, 2023 at 9:57 AM Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
>
> Hi,
> make and git have the -C option which works like:
> (
>    builtin cd -q $COPT
>    git/make "$@"
> )
>
> I think that it is very useful, because no lengthy subshell is needed. Zsh doesn't have such option, could it be added? It's pitty that -C is already used by NO_CLOBBER, but maybe some other letter is free (I didn't found any)?

You can do this:

    zsh-in-dir() ( builtin cd -q -- "$1" && builtin exec zsh "${@:2}" )

This forks and execs once, the same as if there was a native `-C dir` option.

Note that your original code has the same performance thanks to an
optimization in zsh. The second fork is elided.

Roman.

Re: -C -like option to change CWD on startup

[Sebastian Gniazdowski]

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thanks for the interesting example. I would want to note two other programs
that follow -C option convention, namely tar and env. The second can be
even used to workaround the problem, i.e.:

env -C ~/github zsh -c 'some commands'

but still, a dedicated option would be good.

On Thu, 2 Feb 2023 at 09:05, Roman Perepelitsa <roman.perepelitsa@gmail.com>
wrote:

> On Thu, Feb 2, 2023 at 9:57 AM Sebastian Gniazdowski
> <sgniazdowski@gmail.com> wrote:
> >
> > Hi,
> > make and git have the -C option which works like:
> > (
> >    builtin cd -q $COPT
> >    git/make "$@"
> > )
> >
> > I think that it is very useful, because no lengthy subshell is needed.
> Zsh doesn't have such option, could it be added? It's pitty that -C is
> already used by NO_CLOBBER, but maybe some other letter is free (I didn't
> found any)?
>
> You can do this:
>
>     zsh-in-dir() ( builtin cd -q -- "$1" && builtin exec zsh "${@:2}" )
>
> This forks and execs once, the same as if there was a native `-C dir`
> option.
>
> Note that your original code has the same performance thanks to an
> optimization in zsh. The second fork is elided.
>
> Roman.
>


-- 
Best regards,
Sebastian Gniazdowski

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