Implement pprint support

[bbatsov]

That's pretty useful feature that allows clients to specify the way results would be printed. I'm guessing that getting this to work with babashka shouldn't be very hard.

See https://nrepl.org/nrepl/0.7.0/design/middleware.html#_pretty_printing and https://github.com/nrepl/nrepl/blob/master/src/clojure/nrepl/middleware/print.clj for more details.

[kolharsam]

@borkdude could I get started with this before #27 perhaps? Once I'm perhaps comfortable with this, I could then jump to #27. Hope that is okay?

[borkdude]

@kolharsam Sounds good to me!

[borkdude]

@kolharsam Note that babashka patches clojure.pprint since the default one bloats the binary with GraalVM a bit. The code for that is in babashka.impl.pprint. We just have to ensure that when this library is used with babashka, the babashka.impl.pprint namespace is loaded first. But we can see the effect of that in CI where binary size is printed.

[kolharsam]

@borkdude just to be clear: while introducing support for pprint middleware for this, I need to keep in mind to load babashka.impl.pprint first and then build on top of that?
It seems like I'm reiterating your point but just wanted to make sure if I understood this correctly

[borkdude]

@kolharsam We need to make sure that in babashka itself babashk.impl.pprint is loaded before babashka.nrepl.
I now checked main.clj and this is already the case:

   [babashka.impl.pprint :refer [pprint-namespace]]
   [babashka.impl.process :refer [process-namespace]]
   [babashka.impl.protocols :refer [protocols-namespace]]
   [babashka.impl.reify :refer [reify-opts]]
   [babashka.impl.repl :as repl]
   [babashka.impl.socket-repl :as socket-repl]
   [babashka.impl.test :as t]
   [babashka.impl.tools.cli :refer [tools-cli-namespace]]
   [babashka.nrepl.server :as nrepl-server]

So I think we're good.

[borkdude]

All working now. Thanks @kolharsam, @Grazfather and @bbatsov!