Adding Ocaml protoc plugin

pkgs/development/ocaml-modules/ocaml-protoc-plugin/default.nix

@@ -0,0 +1,58 @@
+{ lib
+, fetchFromGitHub
+, buildDunePackage
+, pkg-config
+, protobuf
+, zarith
+, ppx_deriving
+, ppx_deriving_yojson
+, re
+, dune-site
+, ppx_expect
+}:
+
+buildDunePackage rec {
+  pname = "ocaml-protoc-plugin";
+  version = "4.3.1";
+
+  duneVersion = "3";
+
+  minimalOcamlVersion = "4.08";
+
+  src = fetchFromGitHub {
+    owner = "issuu";
+    repo = "ocaml-protoc-plugin";
+    rev = version;
+    hash = "sha256-KFd43Ukz5gMeM3ik2VlfaIPwcZe9yaxk9VcQIrauUGU=";
+  };
+
+  nativeBuildInputs = [
+    pkg-config
+    protobuf
+  ];
+  buildInputs = [
+    zarith
+    ppx_deriving
+    ppx_deriving_yojson
+    re
+    dune-site
+    ppx_expect
+    protobuf
+  ];
+  doCheck = true;
+  nativeCheckInputs = [ protobuf ];
+
+  meta = {
+    description = "Maps google protobuf compiler to Ocaml types.";
+    homepage =
+      "https://github.com/issuu/ocaml-protoc-plugin";
+    license = lib.licenses.asl20;
+    longDescription = ''
+      The goal of Ocaml protoc plugin is to create an
+      up to date plugin for the google protobuf compiler
+      (protoc) to generate Ocaml types and serialization
+      and de-serialization function from a .proto file.
+    '';
+    maintainers = [ lib.maintainers.GirardR1006 ];
+  };
+}

pkgs/top-level/ocaml-packages.nix

@@ -1153,6 +1153,8 @@ let
 
     ocaml-protoc = callPackage ../development/ocaml-modules/ocaml-protoc { };
 
+    ocaml-protoc-plugin = callPackage ../development/ocaml-modules/ocaml-protoc-plugin { };
+
     ocaml-r = callPackage ../development/ocaml-modules/ocaml-r { };
 
     ocaml-recovery-parser = callPackage ../development/tools/ocaml/ocaml-recovery-parser { };