ocamlPackages.ppx_deriving: simplify version selection

, ounit

, ounit2

, ocaml-migrate-parsetree

, version ?

  if lib.versionAtLeast ppxlib.version "0.32" then "6.0.3"

  else if lib.versionAtLeast ppxlib.version "0.20" then "5.2.1"

  else if lib.versionAtLeast ppxlib.version "0.15" then "5.1"

  else "5.0"

}:

let params =

  if lib.versionAtLeast ppxlib.version "0.32" then {

    version = "6.0.3";

    sha256 = "sha256-N0qpezLF4BwJqXgQpIv6IYwhO1tknkRSEBRVrBnJSm0=";

  } else if lib.versionAtLeast ppxlib.version "0.20" then {

    version = "5.2.1";

    sha256 = "11h75dsbv3rs03pl67hdd3lbim7wjzh257ij9c75fcknbfr5ysz9";

  } else if lib.versionAtLeast ppxlib.version "0.15" then {

    version = "5.1";

    sha256 = "1i64fd7qrfzbam5hfbl01r0sx4iihsahcwqj13smmrjlnwi3nkxh";

  } else {

    version = "5.0";

    sha256 = "0fkzrn4pdyvf1kl0nwvhqidq01pnq3ql8zk1jd56hb0cxaw851w3";

  }

; in

let hash = {

  "6.0.3" = "sha256-N0qpezLF4BwJqXgQpIv6IYwhO1tknkRSEBRVrBnJSm0=";

  "5.2.1" = "sha256:11h75dsbv3rs03pl67hdd3lbim7wjzh257ij9c75fcknbfr5ysz9";

  "5.1" = "sha256:1i64fd7qrfzbam5hfbl01r0sx4iihsahcwqj13smmrjlnwi3nkxh";

  "5.0" = "sha256:0fkzrn4pdyvf1kl0nwvhqidq01pnq3ql8zk1jd56hb0cxaw851w3";

}."${version}"; in

buildDunePackage rec {

  pname = "ppx_deriving";

  inherit (params) version;

  inherit version;

  src = fetchurl {

    url = "https://github.com/ocaml-ppx/ppx_deriving/releases/download/v${version}/ppx_deriving-${lib.optionalString (lib.versionOlder version "6.0") "v"}${version}.tbz";

    inherit (params) sha256;

    inherit hash;

  };

  strictDeps = true;