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{ stdenv, ghc, makeWrapper, coreutils, writeScript }:
let
ghc761OrLater = !stdenv.lib.versionOlder ghc.version "7.6.1";
packageDBFlag = if ghc761OrLater then "-package-db" else "-package-conf";
GHCGetPackages = writeScript "ghc-get-packages.sh" ''
#! ${stdenv.shell}
# Usage:
# $1: version of GHC
# $2: invocation path of GHC
# $3: prefix
version="$1"
if test -z "$3"; then
prefix="${packageDBFlag} "
else
prefix="$3"
fi
PATH="$2:$PATH"
IFS=":"
for p in $PATH; do
PkgDir="$p/../lib/ghc-$version/package.conf.d"
for i in "$PkgDir/"*.installedconf; do
# output takes place here
test -f $i && echo -n " $prefix$i"
done
done
test -f "$2/../lib/ghc-$version/package.conf" && echo -n " $prefix$2/../lib/ghc-$version/package.conf"
'';
GHCPackages = writeScript "ghc-packages.sh" ''
#! ${stdenv.shell} -e
declare -A GHC_PACKAGES_HASH # using bash4 hashs to get uniq paths
for arg in $(${GHCGetPackages} ${ghc.version} "$(dirname $0)"); do
case "$arg" in
${packageDBFlag}) ;;
*)
CANONICALIZED="$(${coreutils}/bin/readlink -f -- "$arg")"
GHC_PACKAGES_HASH["$CANONICALIZED"]= ;;
esac
done
for path in ''${!GHC_PACKAGES_HASH[@]}; do
echo -n "$path:"
done
'';
in
stdenv.mkDerivation {
name = "ghc-${ghc.version}-wrapper";
buildInputs = [makeWrapper];
propagatedBuildInputs = [ghc];
unpackPhase = "true";
installPhase = ''
runHook preInstall
mkdir -p $out/bin
for prg in ghc ghci ghc-${ghc.version} ghci-${ghc.version}; do
makeWrapper $ghc/bin/$prg $out/bin/$prg --add-flags "\$(${GHCGetPackages} ${ghc.version} \"\$(dirname \$0)\")"
done
for prg in runghc runhaskell; do
makeWrapper $ghc/bin/$prg $out/bin/$prg --add-flags "\$(${GHCGetPackages} ${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 "\$(${GHCGetPackages} ${ghc.version} \"\$(dirname \$0)\" -${packageDBFlag}=)"
done
for prg in hp2ps hpc hasktags hsc2hs; do
test -x $ghc/bin/$prg && ln -s $ghc/bin/$prg $out/bin/$prg
done
mkdir -p $out/nix-support
ln -s $out/nix-support/propagated-build-inputs $out/nix-support/propagated-user-env-packages
mkdir -p $out/share/doc
ln -s $ghc/lib $out/lib
ln -s $ghc/share/doc/ghc $out/share/doc/ghc-${ghc.version}
runHook postInstall
'';
inherit ghc GHCGetPackages GHCPackages;
inherit (ghc) meta version;
}
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