how to convert encoded path to something build-path can use?

[Stephen Chang]

Hi,

It seems that, since 8.1, the format of paths in links.rktd has changed?

Are there new API fns that deal with this new kind of encoded path? Or
what is the recommended way to process them?

Something like this? (Is this `decode-link-path` public? I couldnt find it)
https://github.com/racket/racket/commit/2ac7e21ad422ee322daa4a7e0db318f9b72b6c48#diff-51453f6da842dc20af8fe776f54ec99dd15f4f8b7e9e73cd5d45cdeb96e40ef6R49-R52

I used to pass the paths directly to `build-path` but now it no longer
works. Here's an example error:

build-path: contract violation
expected: (or/c path-string? path-for-some-system? 'up 'same)
given: '(up up #"pkgs" #"racket-lib")

Any recommendations would be appreciated. Thanks!
Steve

[Matthew Flatt]

Yes, the format changed in that commit.

The `decode-link-path` function is not meant to be public, although it
could be exposed. But for an approach that works now and with older
versions, the API you want is `links` from `setup/link`, possibly like
this:

(links #:file (find-links-file) #:with-path? #t)
(links #:file (find-links-file) #:root? #t)

[Stephen Chang]

Thanks!

We were previously manually processing the files from
current-library-collection-links, but using `links` saves ~100 lines
of code.

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