Support for alternative compilers (ghcjs, eta)

[jneira]

Hi, it would be great that hie-bios could work with other compilers than ghc, concretely, the ghc forks that compile to another targets than native code: eta for jvm bytecode anf ghcjs to javascript.

Not sure if it could be done without changing too much the actual code but i hope it is possible, being both forks of ghc. The tool to start a repl with ghcjs could be cabal itself and for eta the specific fork of cabal, etlas.

As projects usually could be compiled by ghc and the other ones probably a explicit cradle config would be needed. In the case of eta the presence of the specific config file <project>.etlas or etlas.dhall could be used for that.

That could open the use of those compilers in the tools using hie-bios.

[jneira]

After investigating a little bit:

• The extraction of ghc call params could be relatively easy to do for eta/etlas (simply replacing cabal with etlas in the call and the wrapper)
• Extract the params for ghcjs seems to be difficult cause there is no ghcjsi and cabal dont ever call ghcjs with cabal --ghcjs v2-repl
• The code under src/hie/Bios/ghc should be updated (or new code under src/hie/Bios/eta and src/hie/Bios/ghcjs) to call eta/ghcjs with cpp conditions and the package would depend on eta and ghcjs as dependencies

So maybe that would be out of scope of hie-bios... 😟

[jneira]

So maybe that would be out of scope of hie-bios... 😟

definitely it is so closing the issue
maybe if i have time i will add eta support in a fork