83 lines
3 KiB
Nix
83 lines
3 KiB
Nix
# generic builder for Cabal packages
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attrs :
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{
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mkDerivation =
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transform :
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let dtransform =
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self : {
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# pname should be defined by the client to be the package basename
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# version should be defined by the client to be the package version
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# fname is the internal full name of the package
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fname = "${self.pname}-${self.version}";
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# name is the external full name of the package; usually we prefix
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# all packages with haskell- to avoid name clashes for libraries;
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# if that is not desired (for applications), name can be set to
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# fname.
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name = "haskell-${self.pname}-ghc${attrs.ghc.ghc.version}-${self.version}";
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# the default download location for Cabal packages is Hackage,
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# you still have to specify the checksum
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src = attrs.fetchurl {
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url = "http://hackage.haskell.org/packages/archive/${self.pname}/${self.version}/${self.fname}.tar.gz";
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inherit (self) sha256;
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};
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# default buildInputs are just ghc, if more buildInputs are required
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# buildInputs can be extended by the client by using extraBuildInputs,
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# but often propagatedBuildInputs is preferable anyway
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buildInputs = [attrs.ghc] ++ self.extraBuildInputs;
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extraBuildInputs = [];
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# we make sure that propagatedBuildInputs is defined, so that we don't
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# have to check for its existence
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propagatedBuildInputs = [];
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# library directories that have to be added to the Cabal files
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extraLibDirs = map (x : x + "/lib") self.propagatedBuildInputs;
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# compiles Setup and configures
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configurePhase = ''
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eval "$preConfigure"
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for i in Setup.hs Setup.lhs; do
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test -f $i && ghc --make $i
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done
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./Setup configure --verbose --prefix="$out" ${toString (map (x : "--extra-lib-dir=" + x) self.extraLibDirs)} $configureFlags
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eval "$postConfigure"
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'';
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# builds via Cabal
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buildPhase = ''
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eval "$preBuild"
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./Setup build
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eval "$postBuild"
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'';
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# installs via Cabal; creates a registration file for nix-support
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# so that the package can be used in other Haskell-builds; also
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# adds all propagated build inputs to the user environment packages
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installPhase = ''
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eval "$preInstall"
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./Setup copy
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local confDir=$out/lib/ghc-pkgs/ghc-${attrs.ghc.ghc.version}
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ensureDir $confDir
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./Setup register --gen-pkg-config=$confDir/${self.fname}.conf
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ensureDir $out/nix-support
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ln -s $out/nix-support/propagated-build-inputs $out/nix-support/propagated-user-env-packages
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eval "$postInstall"
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'';
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};
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in attrs.stdenv.mkDerivation ((rec { f = dtransform f // transform f; }).f);
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}
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