Create parent directories when creating project directory

Co-authored-by: dbanty <43723790+dbanty@users.noreply.github.com>

Author: Copilot

end_to_end_tests/generated_client.py

@@ -94,7 +94,7 @@ def generate_client(
     """Run the generator and return a GeneratedClientContext for accessing the generated code."""
     args = []
     if extra_args is not None:
-        args = extra_args
+        args = list(extra_args)
     full_output_path = Path(__file__).parent / "tmp" / output_path
 
     if not overwrite:

openapi_python_client/__init__.py

@@ -118,7 +118,7 @@ def build(self) -> Sequence[GeneratorError]:
 
         print(f"Generating {self.project_dir}")
         try:
-            self.project_dir.mkdir()
+            self.project_dir.mkdir(parents=True)
         except FileExistsError:
             if not self.config.overwrite:
                 return [GeneratorError(detail="Directory already exists. Delete it or use the --overwrite option.")]

tests/test___init__.py

@@ -1,6 +1,8 @@
+from pathlib import Path
+
 import pytest
 
-from openapi_python_client import Config, ErrorLevel, GeneratorData, Project
+from openapi_python_client import Config, ErrorLevel, GeneratorData, MetaType, Project
 from openapi_python_client.config import ConfigFile
 from openapi_python_client.schema.untrusted_string import UntrustedString
 
@@ -67,3 +69,22 @@ def test__run_post_hooks_reports_stderr_of_commands_that_error(self, project_wit
         assert error.level == ErrorLevel.ERROR
         assert error.header == "python3 failed"
         assert "some exception" in error.detail
+
+    def test_build_creates_parent_directories(self, tmp_path):
+        fresh_config = Config.from_sources(
+            ConfigFile(),
+            MetaType.POETRY,
+            document_source=Path("openapi.yaml"),
+            file_encoding="utf-8",
+            overwrite=False,
+            output_path=None,
+        )
+        project = make_project(fresh_config)
+        project.project_dir = tmp_path / "nested" / "dir" / "my-api-client"
+        project.package_dir = project.project_dir / project.package_name
+
+        errors = project.build()
+
+        assert errors == []
+        assert project.project_dir.exists()
+        assert project.project_dir.is_dir()