Re: [PATCH] scripts: Add 'environment' command.

[Eric Bavier]

David Thompson writes:

> Hello Guix hackers,
>
> Below is a preliminary version of a new guix command called
> 'environment'.  For those familiar with Nix, it works a lot like
> nix-shell.
[...]
> By default, running 'guix environment' spawns a new $SHELL process,
> because it is usually what one would want to do.  However, the '--exec'
> flag can be used to specify the command to run.

For this option, together with the --search-paths option, would it be
possible to customize the syntax of the output from the
show-search-paths function?  This might be a question for other guix
commands as well.  Either the current shell or the shell from --exec
might set variables in a different way.  E.g. the user is using the
"fish" shell, and doesn't want to spawn a new process, they should be
able to::

  eval (guix environment --search-paths guile)

Btw, fish uses 'set -x PATH "..."' to export PATH set to "..."

Just a thought.

> Finally, the '--load' flag can be used to read a package from a file
> instead of searching $GUIX_PACKAGE_PATH.

Could we instead have a -L or --load-path option like for `guix build`?
This would be useful if the user wants to give multiple packages to
`guix environment` that are all outside $GUIX_PACKAGE_PATH.

I'm very excited for this.

-- 
Eric Bavier

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