Attempt to get pdm build working

.github/workflows/ci.yml

@@ -47,7 +47,7 @@ jobs:
         with:
           # cache to runner
           path: hatch-cache
-          key: ${{ hashFiles('pyproject.toml') }}
+          key: ${{ hashFiles('pyproject.toml') }}-${{ matrix.python-version }}
       - name: Install dependencies
         run: pip install hatch
       - name: Run Tests

.pre-commit-config.yaml

@@ -19,3 +19,5 @@ repos:
     rev: v1.6.1
     hooks:
       - id: mypy
+        additional_dependencies:
+          - types-toml

pyproject.toml

@@ -28,7 +28,13 @@ Homepage = "https://github.com/zdog234/pdm-dotenv"
 source = "vcs"
 
 [tool.hatch.envs.default]
-dependencies = ["pytest>=6.1", "pdm[pytest]>=2.5.2", "pytest-cov>=4.0.0"]
+dependencies = [
+    "pytest>=6.1",
+    "pdm[pytest]>=2.5.2",
+    "pytest-cov>=4.0.0",
+    "python-dotenv[cli]",
+    "toml",
+]
 
 scripts.test = "pytest {args:tests}"
 scripts.test-cov = "pytest --cov=src {args:tests}"

src/pdm_dotenv/__init__.py

@@ -8,7 +8,7 @@
 from typing import Any
 import dotenv
 from pdm.project import ConfigItem, Project
-from pdm.signals import pre_run
+from pdm.signals import pre_invoke
 from pdm.core import Core
 
 
@@ -23,4 +23,4 @@ def plugin(core: Core) -> None:
         "dotenv.path",
         ConfigItem("Path to your .env file", ".env", env_var="PDM_DOTENV_PATH"),
     )
-    pre_run.connect(load_dotenv)
+    pre_invoke.connect(load_dotenv)

tests/test_core.py

@@ -1,6 +1,7 @@
 from pdm.cli.actions import textwrap
 from pdm.project import Project
 from typing import TYPE_CHECKING
+import toml
 
 if TYPE_CHECKING:
     from pdm.pytest import PDMCallable
@@ -21,12 +22,52 @@ def check_env(project: Project, pdm: "PDMCallable") -> None:
                 """
             ),
         ],
+        strict=True,
         obj=project,
     )
 
     assert (project.root / "foo.txt").read_text().strip() == "hello", result.outputs
 
 
+def test_build(project: Project, pdm: "PDMCallable") -> None:
+    """
+    pdm build should pick up and use environment variable
+    e.g. PDM_BUILD_ISOLATION
+    desc: Isolate the build environment from the project environment
+    default: True
+    """
+    exp_ver = "1.2.3"
+    (project.root / ".env").write_text(f"PDM_BUILD_ISOLATION=false\nVERSION={exp_ver}")
+    # setup.py that includes environment variable FOO_BAR in the package
+    (project.root / "setup.py").write_text(
+        textwrap.dedent(
+            """
+            import os
+            from setuptools import setup
+            version = os.environ.get("VERSION", "0.0.1")
+            setup(
+                name="foo",
+                version=version,
+            )
+            """
+        )
+    )
+    pyproject_toml = toml.loads((project.root / "pyproject.toml").read_text())
+    del pyproject_toml["project"]
+    pyproject_toml["build-system"] = {
+        "requires": ["setuptools", "wheel"],
+        "build-backend": "setuptools.build_meta",
+    }
+    (project.root / "pyproject.toml").write_text(toml.dumps(pyproject_toml))
+
+    pdm(
+        ["build"],
+        strict=True,
+        obj=project,
+    )
+    assert (project.root / "dist" / f"foo-{exp_ver}-py3-none-any.whl").exists()
+
+
 def test_happy_path(project: Project, pdm: "PDMCallable") -> None:
     (project.root / ".env").write_text("FOO_BAR_BAZ=hello")