move tomlkit install to build script (#639)

* move tomlkit install to build script

* improve run_python

.github/workflows/build.yml

@@ -41,7 +41,6 @@ jobs:
           echo "${{ github.workspace }}/${{ env.BLENDER_VERSION }}/" >> $GITHUB_PATH
       - name: Build extension
         run: |
-          blender -b -P tests/python.py -- -m pip install tomlkit
           blender -b -P build.py
           mkdir artifact
           mv ${{ env.ADDON_NAME }}-${{ steps.read_manifest.outputs.value }}-*.zip ./artifact/.

build.py

@@ -6,7 +6,28 @@
 from typing import List, Union
 import bpy
 
-import tomlkit
+
+def run_python(args: str | List[str]):
+    python = os.path.realpath(sys.executable)
+
+    if isinstance(args, str):
+        args = [python] + args.split(" ")
+    elif isinstance(args, list):
+        args = [python] + args
+    else:
+        raise ValueError(
+            "Arguments must be a string to split into individual arguments by space"
+            "or a list of individual arguments already split"
+        )
+
+    subprocess.run(args)
+
+
+try:
+    import tomlkit
+except ModuleNotFoundError:
+    run_python("-m pip install tomlkit")
+    import tomlkit
 
 toml_path = "molecularnodes/blender_manifest.toml"
 whl_path = "./molecularnodes/wheels"
@@ -44,11 +65,6 @@ class Platform:
 ]
 
 
-def run_python(args: str):
-    python = os.path.realpath(sys.executable)
-    subprocess.run([python] + args.split(" "))
-
-
 def remove_whls():
     for whl_file in glob.glob(os.path.join(whl_path, "*.whl")):
         os.remove(whl_file)