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{ stdenv, ghc, makeWrapper, coreutils }:
let
ghc761OrLater = !stdenv.lib.versionOlder ghc.version "7.6.1";
packageDBFlag = if ghc761OrLater then "-package-db" else "-package-conf";
in
stdenv.mkDerivation ({
name = "ghc-${ghc.version}-wrapper";
buildInputs = [makeWrapper];
propagatedBuildInputs = [ghc];
unpackPhase = "true";
installPhase = ''
mkdir -p $out/bin
cp $GHCGetPackages $out/bin/ghc-get-packages.sh
chmod 755 $out/bin/ghc-get-packages.sh
for prg in ghc ghci ghc-${ghc.version} ghci-${ghc.version}; do
makeWrapper $ghc/bin/$prg $out/bin/$prg --add-flags "\$($out/bin/ghc-get-packages.sh ${ghc.version} \"\$(dirname \$0)\")"
done
for prg in runghc runhaskell; do
makeWrapper $ghc/bin/$prg $out/bin/$prg --add-flags "\$($out/bin/ghc-get-packages.sh ${ghc.version} \"\$(dirname \$0)\" \" ${packageDBFlag} --ghc-arg=\")"
done
for prg in ghc-pkg ghc-pkg-${ghc.version}; do
makeWrapper $ghc/bin/$prg $out/bin/$prg --add-flags "\$($out/bin/ghc-get-packages.sh ${ghc.version} \"\$(dirname \$0)\" -${packageDBFlag}=)"
done
for prg in hp2ps hpc hasktags hsc2hs; do
test -x $ghc/bin/$prg && ln -s $ghc/bin/$prg $out/bin/$prg
done
cat >> $out/bin/ghc-packages << EOF
#! /bin/bash -e
declare -A GHC_PACKAGES_HASH # using bash4 hashs to get uniq paths
for arg in \$($out/bin/ghc-get-packages.sh ${ghc.version} \"\$(dirname \$0)\"); do
case "\$arg" in
${packageDBFlag}) ;;
*)
CANONICALIZED="\$(${stdenv.lib.optionalString stdenv.isDarwin "${coreutils}/bin/"}readlink -f "\$arg")"
GHC_PACKAGES_HASH["\$CANONICALIZED"]= ;;
esac
done
for path in \''${!GHC_PACKAGES_HASH[@]}; do
echo -n "\$path:"
done
EOF
chmod +x $out/bin/ghc-packages
mkdir -p $out/nix-support
ln -s $out/nix-support/propagated-build-inputs $out/nix-support/propagated-user-env-packages
'';
GHCGetPackages = ./ghc-get-packages.sh;
inherit ghc;
inherit (ghc) meta;
ghcVersion = ghc.version;
} // (stdenv.lib.optionalAttrs ghc761OrLater { preFixup = "sed -i -e 's|-package-conf|${packageDBFlag}|' $out/bin/ghc-get-packages.sh"; }))
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