[Haskell-cafe] Integrate GHC-API with Cabal
felix at alternativebit.fr
Wed Jul 25 08:33:45 UTC 2018
I am currently working on a project  which aims to index the code published on
Stackage in order to provide a "code example" database. Basically, for each
library, I want to generate a real-world example corpus for each exported
Before generating this database, I need to retrieve the exported symbol of a
package. So far, I have been gathering the dependencies and integrating them in
the GHC pkg database using an external stack call, I then parse the cabal file
and load the exposed modules using the GHC API and gather the exported
It works pretty reliably on the simple packages, however, I end up with some
missing dynamic flags for some more advanced packages (missing c includes, c
libraries, ASM flags, etc.). I then started to parse and load these missing
attributes to GHC until I stepped back for a moment and realized I was
re-implementing cabal build.
I then looked for a way to "hook" my GHC API code in cabal build. This would
allow cabal to both handle the dependencies gathering as well as setting up the
correct GHC dyn-flags. The only resource I found was . It's really clever,
however, looks a bit hacky to me.
Is there a better way to perform this kind of "hook"?
* I am aware of the hoogle index generated by haddock. However, this index is
missing when the haddock documentation of a package cannot be generated.
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