buildDunePackage: new support function; use it to refactor some OCaml derivations

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

@@ -1,33 +1,26 @@
-{ stdenv, fetchurl, ocaml, findlib, dune, ppx_sexp_conv, ounit
+{ stdenv, fetchurl, buildDunePackage, ppx_sexp_conv, ounit
 , re, sexplib, stringext
 }:
 
-stdenv.mkDerivation rec {
+buildDunePackage rec {
+  pname = "uri";
   version = "1.9.6";
-  name = "ocaml${ocaml.version}-uri-${version}";
 
   src = fetchurl {
-    url = "https://github.com/mirage/ocaml-uri/releases/download/v${version}/uri-${version}.tbz";
+    url = "https://github.com/mirage/ocaml-${pname}/releases/download/v${version}/${pname}-${version}.tbz";
     sha256 = "1m845rwd70wi4iijkrigyz939m1x84ba70hvv0d9sgk6971w4kz0";
   };
 
   unpackCmd = "tar -xjf $curSrc";
 
-  buildInputs = [ ocaml findlib dune ounit ];
+  buildInputs = [ ounit ];
   propagatedBuildInputs = [ ppx_sexp_conv re sexplib stringext ];
-
-  buildPhase = "jbuilder build";
-
   doCheck = true;
-  checkPhase = "jbuilder runtest";
-
-  inherit (dune) installPhase;
 
   meta = {
     homepage = "https://github.com/mirage/ocaml-uri";
     description = "RFC3986 URI parsing library for OCaml";
     license = stdenv.lib.licenses.isc;
     maintainers = [ stdenv.lib.maintainers.vbgl ];
-    inherit (ocaml.meta) platforms;
   };
 }