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.halli...@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@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs > -- brandon s allbery kf8nh allber...@gmail.com
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