api to access .hi files

[Sam Halliday]

Brandon Allbery <allbery.b at gmail.com> writes:

> At a guess, because the ghc package defaults to being hidden (it's creating
> a new ghc instance at runtime, so the visibility of the ghc package when
> compiling your code is not relevant) you need to do the ghc-api equivalent
> of "-package ghc". Or for testing just "ghc-pkg expose ghc".

Hmm, would that also explain why the Prelude and Control.Monad modules
are not shown either?

Is there a way to expose all modules programmatically?


>
> On Fri, Aug 2, 2019 at 3:47 PM Sam Halliday <sam.halliday at gmail.com> wrote:
>
>> To answer my own question with a solution and another question:
>>
>> Sam Halliday writes:
>> > I'm mostly interested in gathering information about symbols and their
>> > type signatures. As a first exercise: given a module+import section
>> > for a haskell source file, I want to find out which symbols (and their
>> > types) are available. Like :browse in ghci, but programmatically.
>>
>> This is answered by Stephen Diehl's blog post on the ghc api! How lucky
>> I am: http://www.stephendiehl.com/posts/ghc_01.html
>>
>> He points to getNamesInScope
>>
>> Unfortunately I'm getting zero Names back when loading a file that
>> imports several modules from ghc. Is there something I'm missing in the
>> following?
>>
>> module Main where
>>
>> import           Control.Monad
>> import           Control.Monad.IO.Class
>> import           GHC
>> import           GHC.Paths              (libdir)
>>
>> main = runGhc (Just libdir) $ do
>>   dflags <- getSessionDynFlags
>>   void $ setSessionDynFlags $ dflags {
>>       hscTarget = HscInterpreted
>>     , ghcLink   = LinkInMemory
>>     }
>>   addTarget $ Target (TargetFile "exe/Main.hs" Nothing) False Nothing
>>   res <- load LoadAllTargets
>>   liftIO $ putStrLn $ showPpr dflags res
>>   names <- getNamesInScope
>>   liftIO $ putStrLn $ "seen " <> (show $ length names) <> " Names"
>>
>>
>> --
>> Best regards,
>> Sam
>> _______________________________________________
>> ghc-devs mailing list
>> ghc-devs at haskell.org
>> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
>>
>
>
> -- 
> brandon s allbery kf8nh
> allbery.b at gmail.com

-- 
Best regards,
Sam
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