GHC API question: resolving dependencies for modules

[Dmitriy Kovanikov]

Thanks a lot for your suggestion! I’ve looked into GHC source plugins. 
And, specifically, into your `hashtag-coerce` example:

* https://github.com/mpickering/hashtag-coerce <https://github.com/mpickering/hashtag-coerce>

As far as I can see, this allows only to analyse source code (to produce warnings or errors).
While my actual goal is actually to refactor code automatically. And I would
like to avoid full compilation process to make it work faster.

Thanks,
Dmitrii

> On 21 Jun 2018, at 5:51 PM, Matthew Pickering <matthewtpickering at gmail.com> wrote:
> 
> This doesn't answer your question directly but if you want to gather
> information about a module then using a source plugin would probably
> be easier and more robust than using the GHC API.
> 
> You need to write a function of type:
> 
> ```
> ModSummary -> TcGblEnv -> TcM TcGblEnv
> ```
> 
> In `TcGblEnv` you will find `tcg_rdr_env` which contains all top-level
> things and describes how they came to be in scope.
> 
> Source plugins will be in GHC 8.6.
> 
> Cheers,
> 
> Matt
> 
> 
> On Thu, Jun 21, 2018 at 10:06 AM, Dmitriy Kovanikov <kovanikov at gmail.com> wrote:
>> Hello!
>> 
>> I’m trying to use GHC as a library. And my goal is to be able to gather
>> information about where each function or data type came from. I’ve started
>> by simply calling `getNamesInScope` function and observing its result. Here
>> is my code:
>> 
>> * Main.hs: https://lpaste.net/9026688686753841152
>> 
>> And here is the code for my test modules:
>> 
>> * test/X.hs: https://lpaste.net/6844657232357883904
>> * test/Y.hs: https://lpaste.net/8673289058127970304
>> 
>> Unfortunately, my implementation doesn't work since I’m not very familiar
>> with GHC API.
>> And I see the following errors after executing my `Main.hs` file (I’m using
>> ghc-8.2.2):
>> 
>> * error messages: https://lpaste.net/3316737208131518464
>> 
>> Could you please point me to places or parts of GHC API or some
>> documentation about module dependencies and how to make ghc see imports of
>> other modules? I can’t find simple and small enough usage example of this
>> part of the library.
>> 
>> Thanks in advance,
>> Dmitrii Kovanikov
>> 
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