From 1b3feb10442e3685ea60db844437cb596a0eb601 Mon Sep 17 00:00:00 2001
From: Vincent Laporte <Vincent.Laporte@gmail.com>
Date: Tue, 18 Jul 2023 07:09:04 +0200
Subject: [PATCH] =?UTF-8?q?ocamlPackages.dypgen:=20init=20at=200.2=20for?=
 =?UTF-8?q?=20OCaml=20=E2=89=A5=204.07?=
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---
 .../ocaml-modules/dypgen/default.nix          | 35 +++++++++++--------
 1 file changed, 20 insertions(+), 15 deletions(-)

diff --git a/pkgs/development/ocaml-modules/dypgen/default.nix b/pkgs/development/ocaml-modules/dypgen/default.nix
index f504e3d7ca46..d47b78307769 100644
--- a/pkgs/development/ocaml-modules/dypgen/default.nix
+++ b/pkgs/development/ocaml-modules/dypgen/default.nix
@@ -1,21 +1,26 @@
-{stdenv, lib, fetchurl, ocaml, findlib}:
+{ stdenv, lib, fetchFromGitHub, fetchurl, ocaml, findlib }:
 
-let
-  pname = "dypgen";
-in
-
-if lib.versionAtLeast ocaml.version "4.06"
-then throw "${pname} is not available for OCaml ${ocaml.version}"
-else
+let params =
+  if lib.versionAtLeast ocaml.version "4.07" then rec {
+    version = "0.2";
+    src = fetchFromGitHub {
+      owner = "grain-lang";
+      repo = "dypgen";
+      rev = version;
+      hash = "sha256-fKuO/e5YbA2B7XcghWl9pXxwvKw9YlhnmZDZcuKe3cs=";
+    };
+  } else if lib.versionOlder ocaml.version "4.06" then {
+    version = "20120619-1";
+    src = fetchurl {
+      url = "http://dypgen.free.fr/dypgen-20120619-1.tar.bz2";
+      sha256 = "ecb53d6e469e9ec4d57ee6323ff498d45b78883ae13618492488e7c5151fdd97";
+    };
+  } else throw "dypgen is not available for OCaml ${ocaml.version}"
+; in
 
 stdenv.mkDerivation rec {
-  name = "${pname}-${version}";
-  version = "20120619-1";
-
-  src = fetchurl {
-    url = "http://dypgen.free.fr/dypgen-20120619-1.tar.bz2";
-    sha256 = "ecb53d6e469e9ec4d57ee6323ff498d45b78883ae13618492488e7c5151fdd97";
-  };
+  pname = "ocaml${ocaml.version}-dypgen";
+  inherit (params) src version;
 
   nativeBuildInputs = [ ocaml findlib ];