python310Packages.pygal: update dependencies

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

···
 { lib
 , buildPythonPackage
 , fetchPypi
-, fetchpatch
-, isPyPy
-, flask
+, lxml
+, cairosvg
 , pyquery
-, pytest
-, pytest-runner
-, cairosvg
-, tinycss
-, cssselect
-, lxml
+, pytestCheckHook
 }:
 
 buildPythonPackage rec {
   pname = "pygal";
   version = "3.0.0";
-
-  doCheck = !isPyPy; # one check fails with pypy
 
   src = fetchPypi {
     inherit pname version;
     sha256 = "sha256-KSP5XS5RWTCqWplyGdzO+/PZK36vX8HJ/ruVsJk1/bI=";
   };
 
-  buildInputs = [
-    flask
-    pyquery
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace pytest-runner ""
+  '';
 
-    # Should be a check input, but upstream lists it under "setup_requires".
-    # https://github.com/Kozea/pygal/issues/430
-    pytest-runner
-  ];
+  passthru.optional-dependencies = {
+    lxml = [ lxml ];
+    png = [ cairosvg ];
+  };
 
   checkInputs = [
-    pytest
-  ];
+    pyquery
+    pytestCheckHook
+  ] ++ passthru.optional-dependencies.png;
 
   preCheck = ''
     # necessary on darwin to pass the testsuite
     export LANG=en_US.UTF-8
   '';
 
-  postPatch = ''
-    substituteInPlace setup.cfg --replace "[pytest]" "[tool:pytest]"
-  '';
-
-  propagatedBuildInputs = [ cairosvg tinycss cssselect ]
-    ++ lib.optionals (!isPyPy) [ lxml ];
-
   meta = with lib; {
     description = "Sexy and simple python charting";
     homepage = "http://www.pygal.org";
     license = licenses.lgpl3Plus;
     maintainers = with maintainers; [ sjourdois ];
   };
-
 }