[racket] Environment variables in paths

> Can't you write
> (build-path (getenv "WORKSPACE") ....)

The paths are command-line arguments and the tool is run in multiple
places. When I run it locally I don't use environment variables, but it's
also used as a script that's run on Jenkins after a project builds, and
Jenkins defines the workspace variable.

I ended up just making a method that checks if the first path element
starts with a $ and doing exactly what you said, but I was just hoping
there was something already built in.

> Could you push things through a call-out to 'system' with the 'echo'
program?

I'm just copying a file, so I could use system to copy the file instead of
Racket's copy-file, and that would take care of the environment stuff.
That's probably better than my solution.

It would be nice to have a flag or something that tells a path function to
resolve environment variables, but it's probably not a common enough case
to merit an extra api function.

Thanks for the suggestions.

On Fri, Sep 28, 2012 at 4:32 PM, Jay McCarthy <jay.mccarthy at gmail.com>wrote:

> Could you push things through a call-out to 'system' with the 'echo'
> program?
>
> On Fri, Sep 28, 2012 at 3:36 PM, Laurent <laurent.orseau at gmail.com> wrote:
> > Can't you write
> > (build-path (getenv "WORKSPACE") ....)
> > ?
> >
> > Laurent
> >
> > On Fri, Sep 28, 2012 at 11:30 PM, Nick Shelley <nickmshelley at gmail.com>
> > wrote:
> >>
> >> I can't seem to find a path function that deals with environment
> >> variables. Is there some variant of cleanse-path that resolves
> environment
> >> variables first?
> >>
> >> Concretely, I have an environment variable $WORKSPACE that tells where
> I'm
> >> operating from. The result of (getenv "WORKSPACE") is the correct
> absolute
> >> path, but (build-path "$WORKSPACE" ...) doesn't resolve the variable,
> so my
> >> filesystem commands are failing.
> >>
> >> Thanks.
> >>
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>
>
> --
> Jay McCarthy <jay at cs.byu.edu>
> Assistant Professor / Brigham Young University
> http://faculty.cs.byu.edu/~jay
>
> "The glory of God is Intelligence" - D&C 93
>
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