Module → Package lookup in ghc-pkg?
I'm writing code for Emacs's haskell-mode, and it's necessary at one point to be able to find out the package a given module is defined in. The only way of doing this currently is to call ghc-pkg field <package> exposed-modules for every package, then building a lookup table of modules to packages. Could we have one of:
- A way to batch call ghc-pkg once to fetch the exposed-modules (or any field, in fact, as we need to fetch haddock-html for each package as well) for all packages?
- A way to lookup which package(s) a given module is defined in from ghc-pkg?