python3Packages.related: unbreak and pep517 build

Removes dependency on future package.

pkgs/development/python-modules/related/default.nix

@@ -3,17 +3,17 @@
   attrs,
   buildPythonPackage,
   fetchPypi,
-  future,
   pytestCheckHook,
   python-dateutil,
   pythonOlder,
   pyyaml,
+  setuptools,
 }:
 
 buildPythonPackage rec {
   pname = "related";
   version = "0.7.3";
-  format = "setuptools";
+  pyproject = true;
 
   disabled = pythonOlder "3.7";
 
@@ -22,22 +22,40 @@ buildPythonPackage rec {
     hash = "sha256-IqmbqAW6PubN9GBXrMs5Je4u1XkgLl9camSGNrlrFJA=";
   };
 
-  propagatedBuildInputs = [
+  postPatch = ''
+    # Remove outdated setup.cfg
+    rm setup.cfg
+    substituteInPlace setup.py \
+      --replace-fail "'pytest-runner'," ""
+
+    # remove dependency on future
+    substituteInPlace \
+      src/related/dispatchers.py \
+      src/related/fields.py \
+      tests/ex03_company/test_company.py \
+      --replace-fail \
+        "from future.moves.urllib.parse import ParseResult" \
+        "from urllib.parse import ParseResult"
+
+    substituteInPlace \
+      src/related/converters.py \
+      --replace-fail \
+        "from future.moves.urllib.parse import urlparse" \
+        "from urllib.parse import urlparse"
+  '';
+
+  build-system = [ setuptools ];
+
+  pythonRemoveDeps = [ "future" ];
+
+  dependencies = [
     attrs
-    future
     python-dateutil
     pyyaml
   ];
 
   nativeCheckInputs = [ pytestCheckHook ];
 
-  postPatch = ''
-    # Remove outdated setup.cfg
-    rm setup.cfg
-    substituteInPlace setup.py \
-      --replace "'pytest-runner'," ""
-  '';
-
   disabledTests = [
     # Source tarball doesn't contains all needed files
     "test_compose_from_yml"