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{ stdenv, ghc, packages, buildEnv, makeWrapper, ignoreCollisions ? false }:
# This wrapper works only with GHC 6.12 or later.
assert stdenv.lib.versionOlder "6.12" ghc.version;
# It's probably a good idea to include the library "ghc-paths" in the
# compiler environment, because we have a specially patched version of
# that package in Nix that honors these environment variables
#
# NIX_GHC
# NIX_GHCPKG
# NIX_GHC_DOCDIR
# NIX_GHC_LIBDIR
#
# instead of hard-coding the paths. The wrapper sets these variables
# appropriately to configure ghc-paths to point back to the wrapper
# instead of to the pristine GHC package, which doesn't know any of the
# additional libraries.
#
# A good way to import the environment set by the wrapper below into
# your shell is to add the following snippet to your ~/.bashrc:
#
# if [ -e ~/.nix-profile/bin/ghc ]; then
# eval $(grep export ~/.nix-profile/bin/ghc)
# fi
let
ghc761OrLater = stdenv.lib.versionOlder "7.6.1" ghc.version;
packageDBFlag = if ghc761OrLater then "--global-package-db" else "--global-conf";
libDir = "$out/lib/ghc-${ghc.version}";
docDir = "$out/share/doc/ghc/html";
packageCfgDir = "${libDir}/package.conf.d";
isHaskellPkg = x: (x ? pname) && (x ? version);
in
if packages == [] then ghc else
buildEnv {
name = "haskell-env-${ghc.name}";
paths = stdenv.lib.filter isHaskellPkg (stdenv.lib.closePropagation packages) ++ [ghc];
inherit ignoreCollisions;
postBuild = ''
. ${makeWrapper}/nix-support/setup-hook
for prg in ghc ghci ghc-${ghc.version} ghci-${ghc.version}; do
rm -f $out/bin/$prg
makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
--add-flags '"-B$NIX_GHC_LIBDIR"' \
--set "NIX_GHC" "$out/bin/ghc" \
--set "NIX_GHCPKG" "$out/bin/ghc-pkg" \
--set "NIX_GHC_DOCDIR" "${docDir}" \
--set "NIX_GHC_LIBDIR" "${libDir}"
done
for prg in runghc runhaskell; do
rm -f $out/bin/$prg
makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
--add-flags "-f $out/bin/ghc" \
--set "NIX_GHC" "$out/bin/ghc" \
--set "NIX_GHCPKG" "$out/bin/ghc-pkg" \
--set "NIX_GHC_DOCDIR" "${docDir}" \
--set "NIX_GHC_LIBDIR" "${libDir}"
done
for prg in ghc-pkg ghc-pkg-${ghc.version}; do
rm -f $out/bin/$prg
makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "${packageDBFlag}=${packageCfgDir}"
done
$out/bin/ghc-pkg recache
'';
}
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