From cadc15222fa8fe399336332960471f0bd5e55331 Mon Sep 17 00:00:00 2001
From: Mario Rodas <marsam@users.noreply.github.com>
Date: Wed, 2 Sep 2020 19:00:00 -0500
Subject: [PATCH] ocamlPackages.csexp: init at 1.3.1

---
 .../ocaml-modules/csexp/default.nix           | 26 +++++++++++++++++++
 pkgs/top-level/ocaml-packages.nix             |  2 ++
 2 files changed, 28 insertions(+)
 create mode 100644 pkgs/development/ocaml-modules/csexp/default.nix

diff --git a/pkgs/development/ocaml-modules/csexp/default.nix b/pkgs/development/ocaml-modules/csexp/default.nix
new file mode 100644
index 000000000000..512748907003
--- /dev/null
+++ b/pkgs/development/ocaml-modules/csexp/default.nix
@@ -0,0 +1,26 @@
+{ lib, fetchurl, buildDunePackage }:
+
+buildDunePackage rec {
+  pname = "csexp";
+  version = "1.3.1";
+
+  useDune2 = true;
+
+  minimumOCamlVersion = "4.08";
+
+  src = fetchurl {
+    url = "https://github.com/ocaml-dune/csexp/releases/download/${version}/csexp-${version}.tbz";
+    sha256 = "0maihbqbqq9bwr0r1cv51r3m4hrkx9cf5wnxcz7rjgn13lcc9s49";
+  };
+
+  postPatch = ''
+    substituteInPlace src/csexp.ml --replace Result.result Result.t
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/ocaml-dune/csexp";
+    description = "Minimal support for Canonical S-expressions";
+    license = licenses.mit;
+    maintainers = [ maintainers.marsam ];
+  };
+}
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 32bb7d337860..d0dc0bf1e918 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -173,6 +173,8 @@ let
 
     cryptokit = callPackage ../development/ocaml-modules/cryptokit { };
 
+    csexp = callPackage ../development/ocaml-modules/csexp { };
+
     cstruct =
       if lib.versionAtLeast ocaml.version "4.2"
       then callPackage ../development/ocaml-modules/cstruct {}