fix: vendor editables

Signed-off-by: Frost Ming <me@frostming.com>

src/pdm/backend/__init__.py

@@ -77,7 +77,7 @@ def get_requires_for_build_editable(
     When C-extension build is needed, setuptools should be required, otherwise
     just return an empty list.
     """
-    return get_requires_for_build_wheel(config_settings) + ["editables"]
+    return get_requires_for_build_wheel(config_settings)
 
 
 def prepare_metadata_for_build_editable(

src/pdm/backend/_vendor/editables/LICENSE.txt

@@ -0,0 +1,18 @@
+Copyright (c) 2020 Paul Moore
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

src/pdm/backend/_vendor/editables/__init__.py

@@ -0,0 +1,102 @@
+import os
+import re
+from pathlib import Path
+from typing import Dict, Iterable, List, Tuple, Union
+
+__all__ = (
+    "EditableProject",
+    "__version__",
+)
+
+__version__ = "0.5"
+
+
+# Check if a project name is valid, based on PEP 426:
+# https://peps.python.org/pep-0426/#name
+def is_valid(name: str) -> bool:
+    return (
+        re.match(r"^([A-Z0-9]|[A-Z0-9][A-Z0-9._-]*[A-Z0-9])$", name, re.IGNORECASE)
+        is not None
+    )
+
+
+# Slightly modified version of the normalisation from PEP 503:
+# https://peps.python.org/pep-0503/#normalized-names
+# This version uses underscore, so that the result is more
+# likely to be a valid import name
+def normalize(name: str) -> str:
+    return re.sub(r"[-_.]+", "_", name).lower()
+
+
+class EditableException(Exception):
+    pass
+
+
+class EditableProject:
+    def __init__(self, project_name: str, project_dir: Union[str, os.PathLike]) -> None:
+        if not is_valid(project_name):
+            raise ValueError(f"Project name {project_name} is not valid")
+        self.project_name = normalize(project_name)
+        self.bootstrap = f"_editable_impl_{self.project_name}"
+        self.project_dir = Path(project_dir)
+        self.redirections: Dict[str, str] = {}
+        self.path_entries: List[Path] = []
+        self.subpackages: Dict[str, Path] = {}
+
+    def make_absolute(self, path: Union[str, os.PathLike]) -> Path:
+        return (self.project_dir / path).resolve()
+
+    def map(self, name: str, target: Union[str, os.PathLike]) -> None:
+        if "." in name:
+            raise EditableException(
+                f"Cannot map {name} as it is not a top-level package"
+            )
+        abs_target = self.make_absolute(target)
+        if abs_target.is_dir():
+            abs_target = abs_target / "__init__.py"
+        if abs_target.is_file():
+            self.redirections[name] = str(abs_target)
+        else:
+            raise EditableException(f"{target} is not a valid Python package or module")
+
+    def add_to_path(self, dirname: Union[str, os.PathLike]) -> None:
+        self.path_entries.append(self.make_absolute(dirname))
+
+    def add_to_subpackage(self, package: str, dirname: Union[str, os.PathLike]) -> None:
+        self.subpackages[package] = self.make_absolute(dirname)
+
+    def files(self) -> Iterable[Tuple[str, str]]:
+        yield f"{self.project_name}.pth", self.pth_file()
+        if self.subpackages:
+            for package, location in self.subpackages.items():
+                yield self.package_redirection(package, location)
+        if self.redirections:
+            yield f"{self.bootstrap}.py", self.bootstrap_file()
+
+    def dependencies(self) -> List[str]:
+        deps = []
+        if self.redirections:
+            deps.append("editables")
+        return deps
+
+    def pth_file(self) -> str:
+        lines = []
+        if self.redirections:
+            lines.append(f"import {self.bootstrap}")
+        for entry in self.path_entries:
+            lines.append(str(entry))
+        return "\n".join(lines)
+
+    def package_redirection(self, package: str, location: Path) -> Tuple[str, str]:
+        init_py = package.replace(".", "/") + "/__init__.py"
+        content = f"__path__ = [{str(location)!r}]"
+        return init_py, content
+
+    def bootstrap_file(self) -> str:
+        bootstrap = [
+            "from editables.redirector import RedirectingFinder as F",
+            "F.install()",
+        ]
+        for name, path in self.redirections.items():
+            bootstrap.append(f"F.map_module({name!r}, {path!r})")
+        return "\n".join(bootstrap)

src/pdm/backend/_vendor/editables/redirector.py

@@ -0,0 +1,47 @@
+import importlib.abc
+import importlib.machinery
+import importlib.util
+import sys
+from types import ModuleType
+from typing import Dict, Optional, Sequence, Union
+
+ModulePath = Optional[Sequence[Union[bytes, str]]]
+
+
+class RedirectingFinder(importlib.abc.MetaPathFinder):
+    _redirections: Dict[str, str] = {}
+
+    @classmethod
+    def map_module(cls, name: str, path: str) -> None:
+        cls._redirections[name] = path
+
+    @classmethod
+    def find_spec(
+        cls, fullname: str, path: ModulePath = None, target: Optional[ModuleType] = None
+    ) -> Optional[importlib.machinery.ModuleSpec]:
+        if "." in fullname:
+            return None
+        if path is not None:
+            return None
+        try:
+            redir = cls._redirections[fullname]
+        except KeyError:
+            return None
+        spec = importlib.util.spec_from_file_location(fullname, redir)
+        return spec
+
+    @classmethod
+    def install(cls) -> None:
+        for f in sys.meta_path:
+            if f == cls:
+                break
+        else:
+            sys.meta_path.append(cls)
+
+    @classmethod
+    def invalidate_caches(cls) -> None:
+        # importlib.invalidate_caches calls finders' invalidate_caches methods,
+        # and since we install this meta path finder as a class rather than an instance,
+        # we have to override the inherited invalidate_caches method (using self)
+        # as a classmethod instead
+        pass

src/pdm/backend/_vendor/vendor.txt

@@ -2,3 +2,4 @@ packaging==24.0
 tomli==2.0.1
 tomli_w==1.0.0
 pyproject-metadata==0.8.0
+editables==0.5

src/pdm/backend/editable.py

@@ -4,8 +4,7 @@
 import warnings
 from pathlib import Path
 
-from editables import EditableProject
-
+from pdm.backend._vendor.editables import EditableProject
 from pdm.backend._vendor.packaging.utils import canonicalize_name
 from pdm.backend.exceptions import ConfigError, PDMWarning
 from pdm.backend.hooks.base import Context