:set -interactive-print=f does not work

[SmartHypercube]

I have read the code but cannot figure out why :set -interactive-print=f doesn't work. Could anyone please give me a pointer?

It works in GHCi:

*Main Paths_global_project> :m +Prelude
*Main Paths_global_project Prelude> f a = print a >> print "aha!"
*Main Paths_global_project Prelude> :set -interactive-print=f
*Main Paths_global_project Prelude> f ()
()
"aha!"
*Main Paths_global_project Prelude> 

But doesn't work in iHaskell. The "aha!" part does not get printed.

Context: I'm trying to use pretty-simple as described here: https://hackage.haskell.org/package/pretty-simple#pretty-print-all-ghci-output

[vaibhavsagar]

IHaskell is not GHCi, it is another interface that uses the same underlying GHC API. I think the reason this does not work is that GHCi implements support for reconfigurable pretty-printing explicitly, see https://gitlab.haskell.org/ghc/ghc/-/blob/620ee7edc931dc5273dd04880059cc9ec8d41528/ghc/GHCi/UI.hs#L1036-1049, and we do not (currently).

[SmartHypercube]

So it is not enough to use setSessionDynFlags to set the interactivePrint record. Some additional work need to be done. Is my understanding correct?

[vaibhavsagar]

Yes, that's the current state AFAICT.

[SmartHypercube]

I see. Thanks!

(I'll leave this issue open since I still want this feature.)