api to access .hi files

[Brandon Allbery]

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".

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
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>


-- 
brandon s allbery kf8nh
allbery.b at gmail.com
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