1 files changed, 39 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/compilers/reason/default.nix b/nixpkgs/pkgs/development/compilers/reason/default.nix
new file mode 100644
index 000000000000..1b84b9348520
--- /dev/null
+++ b/nixpkgs/pkgs/development/compilers/reason/default.nix
@@ -0,0 +1,39 @@
+{ stdenv, makeWrapper, fetchFromGitHub, ocaml, findlib, dune
+, menhir, merlin_extend, ppx_tools_versioned, utop
+}:
+
+stdenv.mkDerivation rec {
+  name = "ocaml${ocaml.version}-reason-${version}";
+  version = "3.3.7";
+
+  src = fetchFromGitHub {
+    owner = "facebook";
+    repo = "reason";
+    rev = "4d20e5b535c29c5ef1283e65958b32996e449e5a";
+    sha256 = "0f3pb61wg58g8f3wcnp1h4gpmnwmp7bq0cnqdfwldmh9cs0dqyfk";
+  };
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  propagatedBuildInputs = [ menhir merlin_extend ppx_tools_versioned ];
+
+  buildInputs = [ ocaml findlib dune utop menhir ];
+
+  buildFlags = [ "build" ]; # do not "make tests" before reason lib is installed
+
+  inherit (dune) installPhase;
+
+  postInstall = ''
+    wrapProgram $out/bin/rtop \
+      --prefix PATH : "${utop}/bin" \
+      --set OCAMLPATH $out/lib/ocaml/${ocaml.version}/site-lib:$OCAMLPATH
+  '';
+
+  meta = with stdenv.lib; {
+    homepage = https://reasonml.github.io/;
+    description = "Facebook's friendly syntax to OCaml";
+    license = licenses.mit;
+    inherit (ocaml.meta) platforms;
+    maintainers = [ maintainers.volth ];
+  };
+}