feat: support converting setup.cfg without existing setup.py

Fixes #2222

Signed-off-by: Frost Ming <[email protected]>

news/2222.feature.md

@@ -0,0 +1 @@
+Support convert setup.cfg without existing setup.py.

src/pdm/cli/utils.py

@@ -602,13 +602,7 @@ def find_importable_files(project: Project) -> Iterable[tuple[str, Path]]:
     """Find all possible files that can be imported"""
     from pdm.formats import FORMATS
 
-    for filename in (
-        "Pipfile",
-        "pyproject.toml",
-        "requirements.in",
-        "requirements.txt",
-        "setup.py",
-    ):
+    for filename in ("Pipfile", "pyproject.toml", "requirements.in", "requirements.txt", "setup.py", "setup.cfg"):
         project_file = project.root / filename
         if not project_file.exists():
             continue

src/pdm/formats/setup_py.py

@@ -11,13 +11,13 @@
 
 
 def check_fingerprint(project: Project, filename: Path) -> bool:
-    return os.path.basename(filename) == "setup.py"
+    return os.path.basename(filename) in ("setup.py", "setup.cfg")
 
 
 def convert(project: Project, filename: Path, options: Any | None) -> tuple[Mapping[str, Any], Mapping[str, Any]]:
     from pdm.models.in_process import parse_setup_py
 
-    parsed = parse_setup_py(str(project.environment.interpreter.executable), str(filename))
+    parsed = parse_setup_py(str(project.environment.interpreter.executable), os.path.dirname(filename))
     metadata: dict[str, Any] = {}
     settings: dict[str, Any] = {}
     for name in [

src/pdm/models/in_process/parse_setup.py

@@ -165,33 +165,34 @@ def clean_metadata(metadata: Dict[str, Any]) -> None:
 def parse_setup(path: str) -> Dict[str, Any]:
     import tokenize
 
-    import setuptools
-
-    setuptools.setup = fake_setup
-
     parsed: Dict[str, Any] = {}
     path = os.path.abspath(path)
-    project_path = os.path.dirname(path)
-    os.chdir(project_path)
+    os.chdir(path)
     if os.path.exists("setup.cfg"):
         parsed.update(_parse_setup_cfg("setup.cfg"))
 
-    # Execute setup.py and get the kwargs
-    __file__ = sys.argv[0] = path
-    sys.path.insert(0, project_path)
-    setup_kwargs.clear()
+    setup_path = os.path.join(path, "setup.py")
+    if os.path.exists(setup_path):
+        import setuptools
+
+        setuptools.setup = fake_setup
 
-    with tokenize.open(path) as f:
-        code = f.read()
-    exec(
-        compile(code, __file__, "exec"),
-        {"__name__": "__main__", "__file__": __file__, "setup_kwargs": setup_kwargs},
-    )
-    parsed.update(setup_kwargs)
+        # Execute setup.py and get the kwargs
+        __file__ = sys.argv[0] = setup_path
+        sys.path.insert(0, setup_path)
+        setup_kwargs.clear()
+
+        with tokenize.open(setup_path) as f:
+            code = f.read()
+        exec(
+            compile(code, __file__, "exec"),
+            {"__name__": "__main__", "__file__": __file__, "setup_kwargs": setup_kwargs},
+        )
+        parsed.update(setup_kwargs)
 
     if "readme" not in parsed:
         for readme_file in ("README.md", "README.rst", "README.txt"):
-            readme_path = os.path.join(project_path, readme_file)
+            readme_path = os.path.join(path, readme_file)
             if os.path.exists(readme_path):
                 parsed["readme"] = readme_file
                 break