Re: [go-build-system] How to access properties or keys of a package on the build side?

[Leo Famulari]

On Mon, Aug 28, 2017 at 10:32:41PM +0200, Ricardo Wurmus wrote:
> 
> Ricardo Wurmus <address@hidden> writes:
> 
> > You could also access the arguments of another package with
> > “package-arguments”.  Using the “properties” field isn’t pretty because
> > it is a free form alist.
> >
> > You can use “find-tail” to jump to the keyword in “arguments” and then
> > pick the following value.
> 
> Here an example:
> 
> --8<---------------cut here---------------start------------->8---
> (define (assoc-args-ref pkg key)
>   "Return the value associated with KEY in the arguments of package PKG,
> or #F if there is no such key."
>   (let ((ref (find-tail (cut eq? <> key)
>                         (package-arguments pkg))))
>     (and=> ref second)))
> 
> (assoc-args-ref golang-github-com-audriusbutkevicius-go-nat-pmp
>                 #:import-path)
> 
> => "github.com/AudriusButkevicius/go-nat-pmp"
> --8<---------------cut here---------------end--------------->8---

Thanks, this is a nice example.

I realized that the GOPATH variable can be a list of directories, like
PATH, so I'm working in that direction instead of building the symlink
union.

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