[sourcegen] Use hatchling

Co-authored-by: Bryan Weber <bryan.w.weber@gmail.com>

interfaces/dotnet/Cantera/Cantera.csproj

@@ -44,7 +44,7 @@
       <GeneratedPath>$([MSBuild]::NormalizePath($(IntermediateOutputPath)/sourcegen/))</GeneratedPath>
     </PropertyGroup>
 
-    <Exec Command="sourcegen --api=csharp --output=$(GeneratedPath) --root=../../.."
+    <Exec Command="python3 -m sourcegen --api=csharp --output=$(GeneratedPath) --root=../../.."
       Condition="'$(GenerateInterop)' == 'true' Or !Exists('$(GeneratedPath)')"/>
 
     <ItemGroup>

interfaces/sourcegen/pyproject.toml

@@ -1,10 +1,11 @@
 [build-system]
-requires = ["setuptools>=45", "wheel"]
-build-backend = "setuptools.build_meta"
+requires = ["hatchling"]
+build-backend = "hatchling.build"
 
 [project]
 name = "sourcegen"
 version = "3.2.0a2"
+license-files = ["../../License.txt"]
 description = "Source generator for creating Cantera interface code"
 authors = [{name = "Cantera Developers"}]
 requires-python = ">=3.10"
@@ -12,9 +13,3 @@ dependencies = ["jinja2"]
 
 [project.scripts]
 sourcegen = "sourcegen.api:main"
-
-[tool.setuptools.package-dir]
-"" = "src"
-
-[tool.setuptools.package-data]
-"*" = ["*.yaml", "*.in"]

interfaces/sourcegen/src/sourcegen/__main__.py

@@ -0,0 +1,9 @@
+"""Module entry point for sourcegen."""
+
+# This file is part of Cantera. See License.txt in the top-level directory or
+# at https://cantera.org/license.txt for license and copyright information.
+
+from .api import main
+
+if __name__ == "__main__":
+    main()