buildPythonPackage: refactor

pkgs/development/interpreters/python/build-python-package-flit.nix

@@ -0,0 +1,19 @@
+# This function provides specific bits for building a flit-based Python package.
+
+{ flit
+}:
+
+{ ... } @ attrs:
+
+attrs // {
+  buildInputs = [ flit ];
+  buildPhase = attrs.buildPhase or ''
+    runHook preBuild
+    flit wheel
+    runHook postBuild
+  '';
+
+  # Flit packages do not come with tests.
+  installCheckPhase = attrs.checkPhase or ":";
+  doCheck = attrs.doCheck or false;
+}