Set the HIE_HOOGLE_DATABASE environment variable

[expipiplus1]

Currently I set this for shells using the nixpkgs infrastructure with the following shellhook:

export HIE_HOOGLE_DATABASE="$(cat $(${pkgs.which}/bin/which hoogle) | sed -n -e 's|.*--database \(.*\.hoo\).*|\1|p')"

[stale[bot]]

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