Guidance on working with reader macros

[martinklepsch]

Is it in scope for this lib to support transforms involving reader macros? I'm not sure how this would work so totally understand if it's out of scope :)

(require '[borkdude.rewrite-edn :as r])
(def z (r/parse-string "{:data {:foo #profile {:prod 1 :dev 2}}}"))
(r/get-in z [:data :foo]) ;-> <reader-macro: #profile {:prod 1 :dev 2}>
(r/assoc-in z [:data :foo :prod] false) ;-> NPE

[borkdude]

Show me how you would use get-in with normal EDN that contains a reader macro

[martinklepsch]

Show me how you would use get-in with normal EDN that contains a reader macro

Yeah I don't really know how that would work either 😅 I was just thinking of transforming aero configs using rewrite-edn so that's where that line of thinking is coming from...

[borkdude]

I don't know the answer either but would be happy to hear what you came up with :)

[martinklepsch]

Actually, thinking about this more, couldn't there just be a special way of "entering" the value behind the reader macro? I guess that's possible with rewrite-clj already... 💡 I think I just need dive into rewrite-clj a bit more :)

Feel free to close this :)

[borkdude]

Yes, I guess we could support that, e.g. (get-in [:foo :bar ?? :prod]) but what would go on the question marks?

[martinklepsch]

That's the question, isn't it? 😀 Maybe something like this?

(r/get-in [:foo :bar (r/reader-tag 'profile) :prod])

[borkdude]

I'd be willing to support that