Handle internal libraries in GHCi. #3982
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These should have been part of #3955 to be honest but were not needed at the time. Now they are needed, so I'm adding them as a separate commit, to be easy to cherry-pick them if the rest of the PR is not getting merged.
In #3955, as support for compiling with sublibraries was added, a stale comment was left out in the code. Removed here as a separate commit to be easy to cherry-pick if needed.
When GHCi starts it looks for a package in the format given by Cabal but stack used to pass the package name as the name of the sublibrary. So we remove the sublibrary from the list of packages GHCi should search for and add the munged name to the same list by using the `omitPkgs` and `addPkgs` lists.
We need to make a distinction between internal libraries and foreign libraries since we want GHCi to reload when an internal library file changes but we don't want it to confuse an internal library with a foreign one.
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Note: Documentation fixes for https://docs.haskellstack.org/en/stable/ should target the "stable" branch, not master.
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Solves #3926 in a slightly different way than #3981 as it uses information from a different code path in Stack.
Tested by using the
internal-librariescode mentioned in #3899 (comment) which is then transformed into an integration test. The test ensures that GHCi is able to reload after the files of either the main or the internal have changed.