nixpkgs/pkgs/development/libraries/haskell/cabal/cabal.nix

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# generic builder for Cabal packages
attrs :
{
mkDerivation =
transform :
let dtransform =
self : {
# pname should be defined by the client to be the package basename
# version should be defined by the client to be the package version
# fname is the internal full name of the package
fname = "${self.pname}-${self.version}";
# name is the external full name of the package; usually we prefix
# all packages with haskell- to avoid name clashes for libraries;
# if that is not desired (for applications), name can be set to
# fname.
name = "haskell-${self.fname}";
# the default download location for Cabal packages is Hackage,
# you still have to specify the checksum
src = attrs.fetchurl {
url = "http://hackage.haskell.org/packages/archive/${self.pname}/${self.version}/${self.fname}.tar.gz";
inherit (self) sha256;
};
# default buildInputs are just ghc, if more buildInputs are required
# buildInputs can be extended by the client, but often propagatedBuildInputs
# is preferable anyway
buildInputs = [attrs.ghc];
# we make sure that propagatedBuildInputs is defined, so that we don't
# have to check for its existence
propagatedBuildInputs = [];
# library directories that have to be added to the Cabal files
extraLibDirs = map (x : x + "/lib") self.propagatedBuildInputs;
# file(s) that have to be patched with information about extra libraries;
# can be redefined to the empty list by the client if this is not desired
patchLibFiles = [ "${self.pname}.cabal" ];
# patches files, compiles Setup, and configures
configurePhase = ''
eval "$preConfigure"
for i in ${toString self.patchLibFiles}; do
echo "patching $i"
test -f $i && sed -i '/extra-libraries/ { s|\( *\)extra-libraries.*|&\n\1extra-lib-dirs: ${toString self.extraLibDirs}| }' $i
done
for i in Setup.hs Setup.lhs; do
test -f $i && ghc --make $i
done
./Setup configure --prefix="$out"
eval "$postConfigure"
'';
# builds via Cabal
buildPhase = ''
eval "$preBuild"
./Setup build
eval "$postBuild"
'';
# installs via Cabal; creates a registration file for nix-support
# so that the package can be used in other Haskell-builds; also
# creates a register-${name}.sh in userspace that can be used to
# register the library in a user environment (but this scheme
# should sooner or later be deprecated in favour of using a
# ghc-wrapper).
installPhase = ''
eval "$preInstall"
./Setup copy
./Setup register --gen-script
mkdir $out/nix-support
sed -i 's/|.*\(ghc-pkg update\)/| \1/' register.sh
cp register.sh $out/nix-support/register-ghclib.sh
sed -i 's/\(ghc-pkg update\)/\1 --user/' register.sh
mkdir $out/bin
cp register.sh $out/bin/register-${self.name}.sh
eval "$postInstall"
'';
};
in attrs.stdenv.mkDerivation ((rec { f = dtransform f // transform f; }).f);
}