Programmatically access ghcid's status

[srid]

My use case: I want to create something that does :r followed by main in GHCi whenever ghcid succeeds in rebuilding the project (main here runs a web server, so this effectively reloads the web server).

It is not totally clear to me how to do this, specifically having ghcid inform another process that it has succeessfully rebulit the project. Is there a way to do this?

[srid]

Just discovered the -T flag!

[ndmitchell]

Awesome, was just about to ask if -T met your needs :)

[srid]

I still need to figure out a way to talk to a ghci session from outside ...

[ndmitchell]

https://hackage.haskell.org/package/ghcid-0.6.10/docs/Language-Haskell-Ghcid.html has ways to access ghci from outside - it's what ghcid is built on. It won't solve all use cases though.

[srid]

@ndmitchell So I realized that I don't need to have a separate ghci session, and that I can instead re-use that of ghcid. This way I can run Reflex frontend apps using jsaddle-warp straight from ghcid's ghci session, and thereby get automatic server reloading for free!

cf. commit above.