Re: GHC API question: resolving dependencies for modules

I'm sorry of my poor form for not really answering your question here but it's because no one really knows how to use the GHC API. If you are stuck on this path then you could look at how GHC uses the API or an existing user of the API like haddock or haskell-indexer. However, these solutions are not going to be as robust as using a plugin and you will end up with writing a lot of code probably in order to get it to work. Cheers, Matt On Mon, Jun 25, 2018 at 9:34 AM, Dmitriy Kovanikov wrote:

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

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 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 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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