Check that new-build works with ghc-mod/haskell-mode

[ezyang]

Assuming that you modify these to invoke cabal new-build rather than cabal build, do they work? Would be good to test.

CC @maxigit

[23Skidoo]

Would be also nice to patch intero to make it support cabal new-build instead of just stack.

[dcoutts]

I discussed integration with ghc-mod and leksah with their authors at MuniHac. They're planning to file a ticket discussing what info and interface they'd like to get extra info out of cabal new-build, e.g. extensions to the plan.json or new hidden ide command to get things like the ghc environment / flags etc.

Note that leksah now uses cabal new-build as their default build system so we can @hamishmack & @jaccokrijnen for testing & feedback.

[23Skidoo]

Related: #2771.

[maxigit]

Would it not be possible (and probably simpler) to have, either a hacked
version of cabal or a way to configure (per directory) cabal to translate
all basic command (build, install) to their corresponding new version ?

On 8 September 2016 at 12:42, Mikhail Glushenkov [email protected]
wrote:

Related: #2771 #2771.

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[ezyang]

maxigit: Yes, it would be very simple. Or even an environment variable to change the sense of the flags. Actually a fix like that should probably go in 2.0. @maxigit do you think you could take a swing at this?

[maxigit]

I'm thinking of a file instead of environment variable because it's allows to be set by project within the same environment. For example, I use Spacemacs, which is run globally and I switch for one project or another (by switching buffer). I can try to have a go, but I am really busy. I am considering writing a generic wrapper to do a similiar thing but for any executable, as well as changing the executable itself. This will solve the ghc-mod problem, when you need to change the version according to the version of GHC.
It should also allow to swap between cabal and stack transparently. However, I don't really have time for any of this. I can have a try if you let me know which file to look and where would be the best place to add this flag : cabal.config. cabal.project, anything else ?

[ezyang]

A generic wrapper sounds like it would be easier for you to do, and would help you do other stuff. We could then mention it in the documentation as a way to interact with new-build. (Doing this as a setting in cabal.project doesn't sound easy, it doesn't get parsed and read early enough to affect command dispatch.)

[maxigit]

I've done a generic wrapper, called Crew. It's not battle tested but seems to work for my use case (which is use "cabal build" key binding in spacemacs. Comments are welcome.

[ezyang]

Thanks @maxigit!