Fix pip install -e for newer setuptools

- There's a new editable_wheel command that replaced develop, and it
  broke my workflow. It's still brittle, but hopefully we can get rid of
  setuptools soon

Author: virtuald

robotpy_build/command/editable_wheel.py

@@ -0,0 +1,9 @@
+from os.path import abspath
+from setuptools.command.editable_wheel import editable_wheel
+
+
+class EditableWheel(editable_wheel):
+    def run(self):
+        # you aren't supposed to do this, but... they broke my workflow
+        self.distribution.rpybuild_develop_path = abspath(self.project_dir)
+        editable_wheel.run(self)

robotpy_build/setup.py

@@ -24,6 +24,11 @@ def finalize_options(self):
 from .command.build_pyi import BuildPyi
 from .command.develop import Develop
 
+try:
+    from .command.editable_wheel import EditableWheel
+except ImportError:
+    EditableWheel = None  # type: ignore
+
 from .config.pyproject_toml import RobotpyBuildConfig
 
 from .maven import convert_maven_to_downloads
@@ -139,6 +144,8 @@ def prepare(self):
             "build_pyi": BuildPyi,
             "develop": Develop,
         }
+        if EditableWheel:
+            self.setup_kwargs["cmdclass"]["editable_wheel"] = EditableWheel
         if bdist_wheel:
             self.setup_kwargs["cmdclass"]["bdist_wheel"] = bdist_wheel
         for cls in self.setup_kwargs["cmdclass"].values():