Try haskell-ide-engine on GHC!

[Matthew Pickering]

I noticed myself that things start going quite badly when you start
opening files which are not part of the main ghc library. The
workaround to this is to place a `hie.yaml` file in a subdirectory so
indicate that a certain subdirectory shouldn't use the same settings
as compiler. For example, I placed this cradle in the `default

```
cradle: {default}
```

I should probably add a `cradle: [none}` option as well just to
disable HIE on certain files, it will never be able to work loading
some tests as they require a HEAD version of GHC.

In the future I would like to teach hadrian to be able to load any GHC
component built in stage1 into GHCi, it should not be much work, but I
haven't got around to it yet.

On Fri, Jul 26, 2019 at 11:24 AM Alp Mestanogullari <alp at well-typed.com> wrote:
>
> Maybe we can just remove those lines now. :-)
>
> On 26/07/2019 11:36, Sebastian Graf wrote:
>
> Hey all,
>
> What can I say, after few hours of on and off tinkering I got it to work!
> The hover information is incredibly helpful, as is jump to definition. It works even in modules with type and name errors!
> The error information not so much (yet), at least not compared to the shorter feedback loop of using ghcid.
> Haven't used completions in anger yet, but it works quite well when fooling around with it.
>
> Great work, Zubin and Matthew! :)
>
> As to my setup: I'm using VSCode Remote, so the language server will run on my build VM which VSCode communicates with via SSH.
> I'm using nix+home-manager to manage my configuration over there, so I had to wrap the hie executable with the following script:
>
> #! /usr/bin/env bash
> . /etc/profile.d/nix.sh
> nix-shell --pure /path/to/ghc.nix/ --run /path/to/haskell-ide-engine/dist-newstyle/build/x86_64-linux/ghc-8.6.4/haskell-ide-engine-1.0.0.0/x/hie/build/hie/hie
>
> Also the shellHook echo output from ghc.nix confuses the language server protocol, so be sure to delete those 4 lines from ghc.nix/default.nix.
>
> It takes quite a while to initialise the first time around. Be sure to look at the output of the alanz.vscode-hie-server extension to see if there's any progress being made.
> Can only encourage you to try this out!
>
> Best,
> Sebastian
>
>
> Am Do., 25. Juli 2019 um 12:21 Uhr schrieb Matthew Pickering <matthewtpickering at gmail.com>:
>>
>> Hi all,
>>
>> As some of you know I have been working on getting haskell-ide-engine
>> working on GHC for the last few months. Perhaps now the branch is in a
>> usable state where people can try it and report issues. All the basic
>> features such as, hover, completion, error reporting, go to definition
>> etc should work well. I suspect this will be enough for most
>> developers.
>>
>> I have compiled a list of instructions about how to try out the branch.
>>
>> https://gist.github.com/mpickering/68ae458d2c426a29a7c1ddf798dbc793
>>
>> In the last few weeks Zubin has been a great help finishing some parts
>> of the patch that I lost steam for and given it a much better chance
>> of getting merged into the main repo before the end of the year.
>>
>> Cheers,
>>
>> Matt
>> _______________________________________________
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>> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
>
>
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