Merge pull request #3 from python-packaging/pep621-metadata

Support PEP 621 dependencies (pyproject.toml)

.github/workflows/build.yml

@@ -17,6 +17,10 @@ jobs:
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         os: [macOS-latest, ubuntu-latest, windows-latest]
+        exclude:
+          # macOS-latest are now on arm64
+          - os: macOS-latest
+            python-version: "3.7"
 
     steps:
       - name: Checkout

.gitignore

@@ -105,3 +105,6 @@ venv.bak/
 
 # Visual Studio Code
 .vscode/
+
+# Vim swapfiles
+*.sw[op]

Makefile

@@ -27,7 +27,7 @@ format:
 lint:
 	python -m ufmt check $(SOURCES)
 	python -m flake8 $(SOURCES)
-	python -m checkdeps --allow-names metadata_please metadata_please
+	python -m checkdeps --allow-names metadata_please,toml metadata_please
 	mypy --strict --install-types --non-interactive metadata_please
 
 .PHONY: release

metadata_please/__init__.py

@@ -4,13 +4,16 @@
     from_tar_sdist,
     from_zip_sdist,
 )
+from .source_checkout import basic_metadata_from_source_checkout, from_source_checkout
 from .wheel import basic_metadata_from_wheel, from_wheel
 
 __all__ = [
+    "basic_metadata_from_source_checkout",
     "basic_metadata_from_tar_sdist",
-    "basic_metadata_from_zip_sdist",
     "basic_metadata_from_wheel",
-    "from_zip_sdist",
+    "basic_metadata_from_zip_sdist",
+    "from_source_checkout",
     "from_tar_sdist",
     "from_wheel",
+    "from_zip_sdist",
 ]

metadata_please/source_checkout.py

@@ -0,0 +1,237 @@
+"""
+Best-effort metadata extraction for "source checkouts" -- e.g. a local dir containing pyproject.toml.
+
+This is different from an (extracted) sdist, which *should* have a generated dist-info already.
+
+Prefers:
+- PEP 621 metadata (pyproject.toml)
+- Poetry metadata (pyproject.toml)
+- Setuptools static metadata (setup.cfg)
+
+Notably, does not read setup.py or attempt to emulate anything that can't be read staticly.
+"""
+import re
+from pathlib import Path
+
+try:
+    import tomllib as toml
+except ImportError:
+    import toml  # type: ignore[no-redef,unused-ignore]
+
+from configparser import NoOptionError, NoSectionError, RawConfigParser
+
+from packaging.utils import canonicalize_name
+
+from .types import BasicMetadata
+
+OPERATOR_RE = re.compile(r"([<>=~]+)(\d.*)")
+
+
+def combine_markers(*markers: str) -> str:
+    filtered_markers = [m for m in markers if m and m.strip()]
+    if len(filtered_markers) == 0:
+        return ""
+    elif len(filtered_markers) == 1:
+        return filtered_markers[0]
+    else:
+        return " and ".join(f"({m})" for m in filtered_markers)
+
+
+def merge_extra_marker(extra_name: str, value: str) -> str:
+    """Simulates what a dist-info requirement string would look like if also restricted to an extra."""
+    if ";" not in value:
+        return f'{value} ; extra == "{extra_name}"'
+    else:
+        a, _, b = value.partition(";")
+        a = a.strip()
+        b = b.strip()
+        c = f'extra == "{extra_name}"'
+        return f"{a} ; {combine_markers(b, c)}"
+
+
+def from_source_checkout(path: Path) -> bytes:
+    return (
+        from_pep621_checkout(path)
+        or from_poetry_checkout(path)
+        or from_setup_cfg_checkout(path)
+    )
+
+
+def from_pep621_checkout(path: Path) -> bytes:
+    """
+    Returns a metadata snippet (which is zero-length if this is none of this style).
+    """
+    try:
+        data = (path / "pyproject.toml").read_text()
+    except FileNotFoundError:
+        return b""
+    doc = toml.loads(data)
+
+    buf: list[str] = []
+    for dep in doc.get("project", {}).get("dependencies", ()):
+        buf.append(f"Requires-Dist: {dep}\n")
+    for k, v in doc.get("project", {}).get("optional-dependencies", {}).items():
+        extra_name = canonicalize_name(k)
+        buf.append(f"Provides-Extra: {extra_name}\n")
+        for i in v:
+            buf.append("Requires-Dist: " + merge_extra_marker(extra_name, i) + "\n")
+
+    return "".join(buf).encode("utf-8")
+
+
+def _translate_caret(specifier: str) -> str:
+    """
+    Given a string like "^0.2.3" returns ">=0.2.3,<0.3.0".
+    """
+    assert "," not in specifier
+    parts = specifier[1:].split(".")
+    while len(parts) < 3:
+        parts.append("0")
+
+    for i in range(len(parts)):
+        if parts[i] != "0":
+            # The docs are not super clear about how this behaves, but let's
+            # assume integer-valued parts and just let the exception raise
+            # otherwise.
+            incremented = parts[:]
+            incremented[i] = str(int(parts[i]) + 1)
+            del incremented[i + 1 :]
+            incremented_version = ".".join(incremented)
+            break
+    else:
+        raise ValueError("All components were zero?")
+    return f">={specifier[1:]},<{incremented_version}"
+
+
+def _translate_tilde(specifier: str) -> str:
+    """
+    Given a string like "~1.2.3" returns ">=1.2.3,<1.3".
+    """
+    assert "," not in specifier
+    parts = specifier[1:].split(".")
+    incremented = parts[:2]
+    incremented[-1] = str(int(incremented[-1]) + 1)
+    incremented_version = ".".join(incremented)
+
+    return f">={specifier[1:]},<{incremented_version}"
+
+
+def from_poetry_checkout(path: Path) -> bytes:
+    """
+    Returns a metadata snippet (which is zero-length if this is none of this style).
+    """
+    try:
+        data = (path / "pyproject.toml").read_text()
+    except FileNotFoundError:
+        return b""
+    doc = toml.loads(data)
+
+    saved_extra_constraints = {}
+
+    buf: list[str] = []
+    for k, v in doc.get("tool", {}).get("poetry", {}).get("dependencies", {}).items():
+        if k == "python":
+            pass  # TODO requires-python
+        else:
+            k = canonicalize_name(k)
+            if isinstance(v, dict):
+                version = v.get("version", "")
+                if "extras" in v:
+                    extras = "[%s]" % (",".join(v["extras"]))
+                else:
+                    extras = ""
+                markers = v.get("markers", "")
+                python = v.get("python", "")
+                if python:
+                    m = OPERATOR_RE.fullmatch(python)
+                    assert m is not None
+                    # TODO do ^/~ work on python version?
+                    python = f"python_version {m.group(1)} '{m.group(2)}'"
+                markers = combine_markers(markers, python)
+                if markers:
+                    markers = " ; " + markers
+                optional = v.get("optional", False)
+            else:
+                version = v
+                extras = ""
+                markers = ""
+                optional = False
+
+            if not version:
+                # e.g. git, path or url dependencies, skip for now
+                continue
+
+            # https://python-poetry.org/docs/dependency-specification/#version-constraints
+            # 1.2.* type wildcards are supported natively in packaging
+            if version.startswith("^"):
+                version = _translate_caret(version)
+            elif version.startswith("~"):
+                version = _translate_tilde(version)
+            elif version == "*":
+                version = ""
+
+            if version[:1].isdigit():
+                version = "==" + version
+
+            if optional:
+                saved_extra_constraints[k] = (f"{extras}{version}", markers)
+            else:
+                buf.append(f"Requires-Dist: {k}{extras}{version}{markers}\n")
+
+    for k, v in doc.get("tool", {}).get("poetry", {}).get("extras", {}).items():
+        k = canonicalize_name(k)
+        buf.append(f"Provides-Extra: {k}\n")
+        for vi in v:
+            vi = canonicalize_name(vi)
+            constraints, markers = saved_extra_constraints[vi]
+            buf.append(
+                f"Requires-Dist: {vi}{constraints}{merge_extra_marker(k, markers)}"
+            )
+
+    return "".join(buf).encode("utf-8")
+
+
+def from_setup_cfg_checkout(path: Path) -> bytes:
+    try:
+        data = (path / "setup.cfg").read_text()
+    except FileNotFoundError:
+        return b""
+
+    rc = RawConfigParser()
+    rc.read_string(data)
+
+    buf: list[str] = []
+    try:
+        for dep in rc.get("options", "install_requires").splitlines():
+            dep = dep.strip()
+            if dep:
+                buf.append(f"Requires-Dist: {dep}\n")
+    except (NoOptionError, NoSectionError):
+        pass
+
+    try:
+        section = rc["options.extras_require"]
+    except KeyError:
+        pass
+    else:
+        for k, v in section.items():
+            extra_name = canonicalize_name(k)
+            buf.append(f"Provides-Extra: {extra_name}\n")
+            for i in v.splitlines():
+                i = i.strip()
+                if i:
+                    buf.append(
+                        "Requires-Dist: " + merge_extra_marker(extra_name, i) + "\n"
+                    )
+
+    return "".join(buf).encode("utf-8")
+
+
+def basic_metadata_from_source_checkout(path: Path) -> BasicMetadata:
+    return BasicMetadata.from_metadata(from_source_checkout(path))
+
+
+if __name__ == "__main__":  # pragma: no cover
+    import sys
+
+    print(basic_metadata_from_source_checkout(Path(sys.argv[1])))

metadata_please/tests/__init__.py

@@ -1,8 +1,10 @@
 from .sdist import TarSdistTest, ZipSdistTest
+from .source_checkout import SourceCheckoutTest
 from .wheel import WheelTest
 
 __all__ = [
+    "SourceCheckoutTest",
+    "TarSdistTest",
     "WheelTest",
     "ZipSdistTest",
-    "TarSdistTest",
 ]