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

[Ricardo Wurmus]

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---


-- 
Ricardo

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