From 761fd7899dc4c59c67e109154c43e7d38cfcf705 Mon Sep 17 00:00:00 2001
From: Guillaume Girol <symphorien+git@xlumurb.eu>
Date: Sun, 24 Apr 2022 12:00:00 +0000
Subject: [PATCH] ocamlPackages.ocamlformat-rpc-lib: downgrade for ocaml <=
 4.12

required for ocaml-lsp
---
 .../ocamlformat-rpc-lib/default.nix            | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/ocaml-modules/ocamlformat-rpc-lib/default.nix b/pkgs/development/ocaml-modules/ocamlformat-rpc-lib/default.nix
index 95046e670ad..e3582cbed1d 100644
--- a/pkgs/development/ocaml-modules/ocamlformat-rpc-lib/default.nix
+++ b/pkgs/development/ocaml-modules/ocamlformat-rpc-lib/default.nix
@@ -1,12 +1,24 @@
-{ lib, fetchurl, buildDunePackage, csexp, sexplib0 }:
+{ lib, fetchurl, buildDunePackage, ocaml, csexp, sexplib0 }:
+
+# for compat with ocaml-lsp
+let source =
+  if lib.versionAtLeast ocaml.version "4.13"
+  then {
+    version = "0.21.0";
+    sha256 = "sha256-KhgX9rxYH/DM6fCqloe4l7AnJuKrdXSe6Y1XY3BXMy0=";
+  } else {
+    version = "0.20.0";
+    sha256 = "sha256-JtmNCgwjbCyUE4bWqdH5Nc2YSit+rekwS43DcviIfgk=";
+  };
+in
 
 buildDunePackage rec {
   pname = "ocamlformat-rpc-lib";
-  version = "0.21.0";
+  inherit (source) version;
 
   src = fetchurl {
     url = "https://github.com/ocaml-ppx/ocamlformat/releases/download/${version}/ocamlformat-${version}.tbz";
-    sha256 = "sha256-KhgX9rxYH/DM6fCqloe4l7AnJuKrdXSe6Y1XY3BXMy0=";
+    inherit (source) sha256;
   };
 
   minimumOCamlVersion = "4.08";