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

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{stdenv, ghc, packages ? [], makeWrapper}:
stdenv.mkDerivation rec {
name = "haskell-env-${ghc.name}";
allPackages = stdenv.lib.closePropagation packages;
buildInputs = allPackages ++ [makeWrapper];
propagatedBuildInputs = packages;
unpackPhase = "true";
installPhase = ''
numversion=$(${ghc}/bin/ghc --numeric-version)
majorversion=''${numversion%%.*}
minorversion=''${numversion#*.}
minorversion=''${minorversion%%.*}
if [[ $majorversion -gt 6 ]] && [[ $minorversion -gt 4 ]]; then
globalConf="--global-package-db"
else
globalConf="--global-conf"
fi
originalTopDir="${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 $out/bin
echo -n .
done
for f in "$currentPath/etc/bash_completion.d/"*; do
mkdir -p $out/etc/bash_completion.d
ln -s $f $out/etc/bash_completion.d/
echo -n .
done
for s in 1 2 3 4 5 6 7 8 9; do
for f in "$currentPath/share/man/man$s/"*; do
mkdir -p $out/share/man/man$s
ln -sv $f $out/share/man/man$s/
echo -n .
done
done
for f in "$currentPath/share/emacs/site-lisp/"*; do
mkdir -p $out/share/emacs/site-lisp
ln -s $f $out/share/emacs/site-lisp/
echo -n .
done
for f in "$currentPath/share/ghci/"*; do
mkdir -p $out/share/ghci
ln -s $f $out/share/ghci/
echo -n .
done
for f in "$currentPkgDir/"*.conf; do
ln -s $f $linkedPkgDir
echo -n .
done
echo
fi
done
echo -n "Generating package cache "
${ghc}/bin/ghc-pkg $globalConf $linkedPkgDir recache
echo .
echo -n "Generating wrappers "
for prg in ghc ghci ghc-${ghc.version} ghci-${ghc.version}; do
# The NIX env-vars are picked up by our patched version of ghc-paths.
makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
--add-flags "-B$linkedTopDir" \
--set "NIX_GHC" "$out/bin/ghc" \
--set "NIX_GHCPKG" "$out/bin/ghc-pkg" \
--set "NIX_GHC_LIBDIR" "$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 "$globalConf $linkedPkgDir"
echo -n .
done
for prg in hp2ps hpc hasktags hsc2hs haddock haddock-${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;
}