nixpkgs/pkgs/development/compilers/ghc/with-packages.nix

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{stdenv, ghc, packages ? [], makeWrapper}:
stdenv.mkDerivation rec {
name = "ghc-${ghc.version}-linkdir";
allPackages = stdenv.lib.closePropagation packages;
buildInputs = allPackages ++ [makeWrapper];
propagatedBuildInputs = packages;
unpackPhase = "true";
installPhase = ''
originalTopDir="${ghc}/lib/ghc-${ghc.version}"
originalPkgDir="$originalTopDir/package.conf.d"
linkedTopDir="$out/lib"
linkedPkgDir="$linkedTopDir/package.conf.d"
mkdir -p $out/bin
mkdir -p $linkedTopDir
mkdir -p $linkedPkgDir
echo "Linking GHC core libraries:"
echo -n "Linking $originalTopDir "
for f in "$originalTopDir/"*; do
if test -f $f; then
ln -s $f $linkedTopDir
echo -n .
fi
done
echo
echo -n "Linking $originalPkgDir "
for f in "$originalPkgDir/"*.conf; do
ln -s $f $linkedPkgDir
echo -n .
done
echo
echo "Linking selected packages and dependencies:"
for currentPath in ${stdenv.lib.concatStringsSep " " allPackages}; do
currentPkgDir="$currentPath/lib/ghc-pkgs/ghc-${ghc.version}"
# Check if current path is a Cabal package for the current GHC
if test -d $currentPkgDir; then
echo -n "Linking $currentPath "
for f in "$currentPath/bin/"*; do
ln -s $f $out/bin
echo -n .
done
for f in "$currentPkgDir/"*.conf; do
ln -s $f $linkedPkgDir
echo -n .
done
echo
fi
done
echo -n "Generating package cache "
${ghc}/bin/ghc-pkg --global-conf $linkedPkgDir recache
echo .
echo -n "Generating wrappers "
for prg in ghc ghci ghc-${ghc.version} ghci-${ghc.version}; do
makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "-B$linkedTopDir"
echo -n .
done
for prg in runghc runhaskell; do
makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "-f $out/bin/ghc"
echo -n .
done
for prg in ghc-pkg ghc-pkg-${ghc.version}; do
makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "--global-conf $linkedPkgDir"
echo -n .
done
for prg in hp2ps hpc hasktags hsc2hs haddock haddock-${ghc.version}; do
if test -x ${ghc}/bin/$prg -a ! -x $out/bin/$prg; then
ln -s ${ghc}/bin/$prg $out/bin/$prg && echo -n .
fi
done
echo
'';
meta = ghc.meta;
}