ocamlPackages.ppx_derivers: init at 1.0

Ppx_derivers is a tiny package whose sole purpose is to allow ppx_deriving and
ppx_type_conv to inter-operate gracefully when linked as part of the same
ocaml-migrate-parsetree driver.

Homepage: https://github.com/diml/ppx_derivers

pkgs/development/ocaml-modules/ppx_derivers/default.nix

@@ -0,0 +1,29 @@
+{ stdenv, fetchFromGitHub, ocaml, findlib, jbuilder }:
+
+if !stdenv.lib.versionAtLeast ocaml.version "4.02"
+then throw "ppx_derivers is not available for OCaml ${ocaml.version}"
+else
+
+stdenv.mkDerivation rec {
+	name = "ocaml${ocaml.version}-ppx_derivers-${version}";
+	version = "1.0";
+
+	src = fetchFromGitHub {
+		owner = "diml";
+		repo = "ppx_derivers";
+		rev = version;
+		sha256 = "049yy9706lv1li6a1bibkz1qq2ixxbdyhf4f5w9pv71jc3dlpfy8";
+	};
+
+	buildInputs = [ ocaml findlib jbuilder ];
+
+	inherit (jbuilder) installPhase;
+
+	meta = {
+		description = "Shared [@@deriving] plugin registry";
+		license = stdenv.lib.licenses.bsd3;
+		maintainers = [ stdenv.lib.maintainers.vbgl ];
+		inherit (src.meta) homepage;
+		inherit (ocaml.meta) platforms;
+	};
+}

pkgs/top-level/ocaml-packages.nix

@@ -536,6 +536,8 @@ let
       then callPackage ../development/ocaml-modules/ppx_blob {}
       else null;
 
+    ppx_derivers = callPackage ../development/ocaml-modules/ppx_derivers {};
+
     ppx_deriving =
       if lib.versionAtLeast ocaml.version "4.02"
       then callPackage ../development/ocaml-modules/ppx_deriving {}