vendor catch22 C sources via git submodule instead of copying

.github/workflows/run_unit_tests.yaml

@@ -9,9 +9,11 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
     steps:
       - uses: actions/checkout@v3
+        with:
+          submodules: recursive
       - name: Setup python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "src/catch22"]
+	path = src/catch22
+	url = https://github.com/DynamicsAndNeuralSystems/catch22.git

MANIFEST.in

@@ -1 +1,2 @@
 graft src
+exclude src/catch22/.git

README.md

@@ -97,6 +97,14 @@ Thanks to [@jmoo2880](https://github.com/jmoo2880) for putting together a [demon
 
 ### Manual install
 
+The upstream _catch22_ C sources are vendored as a git submodule, so clone with submodules before building from source:
+
+```
+git clone --recurse-submodules https://github.com/DynamicsAndNeuralSystems/pycatch22.git
+```
+
+(If you already cloned without `--recurse-submodules`, run `git submodule update --init` from the repository root.)
+
 If you find issues with the `pip` install, you can also install using `setuptools`:
 
 ```

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "pycatch22"
-version = "0.4.5"
+version = "0.5.0"
 authors = [
     {name = "Carl H Lubba"},
     {email = "carl.lubba@gmx.de"},

setup.py

@@ -2,11 +2,14 @@
 import sysconfig
 import os
 
-sourceDir = os.path.join("src", "C");
+# Upstream catch22 C sources live in a git submodule (src/catch22); the
+# pycatch22-specific CPython wrapper lives alongside it in src/wrapper.
+upstreamDir = os.path.join("src", "catch22", "C")
+wrapDir = os.path.join("src", "wrapper")
 
-sourceFileList = [os.path.join(sourceDir, file) for file in os.listdir(sourceDir) if file.endswith(
+sourceFileList = [os.path.join(upstreamDir, file) for file in os.listdir(upstreamDir) if file.endswith(
     ".c") and not 'main' in file]
-    # and not (file == "sampen.c" or file == "run_features.c")]
+sourceFileList.append(os.path.join(wrapDir, "catch22_wrap.c"))
 
 cflags = sysconfig.get_config_var('CFLAGS')
 if cflags is not None:
@@ -19,7 +22,7 @@
 # The c++ extension module:
 extension_mod = Extension(name = "catch22_C",
     sources = sourceFileList,
-    include_dirs = [sourceDir],
+    include_dirs = [upstreamDir],
     extra_compile_args = extra_compile_args)  # Header files are here
 
 setup(