Add support for hatch.toml to CLI

CHANGELOG.md

@@ -12,6 +12,12 @@ The **third number** is for emergencies when we need to start branches for older
 
 ## [Unreleased](https://github.com/hynek/hatch-fancy-pypi-readme/compare/22.8.0...HEAD)
 
+### Added
+
+- CLI support for `hatch.toml`.
+  [#27](https://github.com/hynek/hatch-fancy-pypi-readme/issues/27)
+
+
 ## [22.8.0](https://github.com/hynek/hatch-fancy-pypi-readme/compare/22.7.0...22.8.0) - 2022-10-02
 
 ### Added

README.md

@@ -57,7 +57,11 @@ Now *you* too can have fancy PyPI readmes – just by adding a few lines of conf
 
 ## Configuration
 
-*hatch-fancy-pypi-readme* is, like [Hatch], configured in your project’s `pyproject.toml`.
+*hatch-fancy-pypi-readme* is, like [Hatch], configured in your project’s `pyproject.toml`[^hatch-toml].
+
+[^hatch-toml]: As with Hatch, you can also use `hatch.toml` for configuration options that start with `tool.hatch` and leave that prefix out.
+  That means `pyprojects.toml`’s `[tool.hatch.metadata.hooks.fancy-pypi-readme]` becomes `[metadata.hooks.fancy-pypi-readme]` when in `hatch.toml`.
+  To keep the documentation simple, the more common `pyproject.toml` syntax is used throughout.
 
 First you add *hatch-fancy-pypi-readme* to your `[build-system]`:
 
@@ -254,14 +258,11 @@ with our [example configuration][example-config], you will get the following out
 ![rich-cli output](rich-cli-out.svg)
 
 > **Warning**
+> While the execution model is somewhat different from the [Hatch]-Python packaging pipeline, it uses the same configuration validator and text renderer, so the fidelity should be high.
 >
-> - The **CLI** currently doesn’t support `hatch.toml`.
->   The **plugin** itself does.
-> - While the execution model is somewhat different from the [Hatch]-Python packaging pipeline, it uses the same configuration validator and text renderer, so the fidelity should be high.
->
->   It will **not** help you debug **packaging issues**, though.
+> It will **not** help you debug **packaging issues**, though.
 >
->   To verify your PyPI readme using the full packaging pipeline, check out my [*build-and-inspect-python-package*](https://github.com/hynek/build-and-inspect-python-package) GitHub Action.
+> To verify your PyPI readme using the full packaging pipeline, check out my [*build-and-inspect-python-package*](https://github.com/hynek/build-and-inspect-python-package) GitHub Action.
 
 
 ## Project Links

src/hatch_fancy_pypi_readme/__main__.py

@@ -8,6 +8,7 @@
 import sys
 
 from contextlib import closing
+from pathlib import Path
 from typing import TextIO
 
 from ._cli import cli_run
@@ -21,7 +22,8 @@
 
 def main() -> None:
     parser = argparse.ArgumentParser(
-        description="Render a README from a pyproject.toml"
+        description="Render a README from a pyproject.toml & hatch.toml."
+        " If a hatch.toml is passed / detected, it's preferred."
     )
     parser.add_argument(
         "pyproject_path",
@@ -31,21 +33,42 @@ def main() -> None:
         help="Path to the pyproject.toml to use for rendering. "
         "Default: pyproject.toml in current directory.",
     )
+    parser.add_argument(
+        "--hatch-toml",
+        nargs="?",
+        metavar="PATH-TO-HATCH.TOML",
+        default=None,
+        help="Path to an additional hatch.toml to use for rendering. "
+        "Default: Auto-detect in the current directory.",
+    )
     parser.add_argument(
         "-o",
         help="Target file for output. Default: standard out.",
         metavar="TARGET-FILE-PATH",
     )
     args = parser.parse_args()
 
-    with open(args.pyproject_path, "rb") as fp:
-        cfg = tomllib.load(fp)
+    pyproject = tomllib.loads(Path(args.pyproject_path).read_text())
+    hatch_toml = _maybe_load_hatch_toml(args.hatch_toml)
 
     out: TextIO
     out = open(args.o, "w") if args.o else sys.stdout  # noqa: SIM115
 
     with closing(out):
-        cli_run(cfg, out)
+        cli_run(pyproject, hatch_toml, out)
+
+
+def _maybe_load_hatch_toml(hatch_toml_arg: str | None) -> dict[str, object]:
+    """
+    If hatch.toml is passed or detected, load it.
+    """
+    if hatch_toml_arg:
+        return tomllib.loads(Path(hatch_toml_arg).read_text())
+
+    if Path("hatch.toml").exists():
+        return tomllib.loads(Path("hatch.toml").read_text())
+
+    return {}
 
 
 if __name__ == "__main__":

src/hatch_fancy_pypi_readme/_cli.py

@@ -15,7 +15,9 @@
 from ._config import load_and_validate_config
 
 
-def cli_run(pyproject: dict[str, Any], out: TextIO) -> None:
+def cli_run(
+    pyproject: dict[str, Any], hatch_toml: dict[str, Any], out: TextIO
+) -> None:
     """
     Best-effort verify config and print resulting PyPI readme.
     """
@@ -27,14 +29,33 @@ def cli_run(pyproject: dict[str, Any], out: TextIO) -> None:
         _fail("You must add 'readme' to 'project.dynamic'.")
 
     try:
-        cfg = pyproject["tool"]["hatch"]["metadata"]["hooks"][
-            "fancy-pypi-readme"
-        ]
+        if (
+            pyproject["tool"]["hatch"]["metadata"]["hooks"][
+                "fancy-pypi-readme"
+            ]
+            and hatch_toml["metadata"]["hooks"]["fancy-pypi-readme"]
+        ):
+            _fail(
+                "Both pyproject.toml and hatch.toml contain "
+                "hatch-fancy-pypi-readme configuration."
+            )
     except KeyError:
-        _fail(
-            "Missing configuration "
-            "(`[tool.hatch.metadata.hooks.fancy-pypi-readme]`)",
-        )
+        pass
+
+    try:
+        cfg = hatch_toml["metadata"]["hooks"]["fancy-pypi-readme"]
+    except KeyError:
+        try:
+            cfg = pyproject["tool"]["hatch"]["metadata"]["hooks"][
+                "fancy-pypi-readme"
+            ]
+        except KeyError:
+            _fail(
+                "Missing configuration "
+                "(`[tool.hatch.metadata.hooks.fancy-pypi-readme]` in"
+                " pyproject.toml or `[metadata.hooks.fancy-pypi-readme]`"
+                " in hatch.toml)",
+            )
 
     try:
         config = load_and_validate_config(cfg)

tests/test_cli.py

@@ -9,7 +9,7 @@
 
 import pytest
 
-from hatch_fancy_pypi_readme.__main__ import tomllib
+from hatch_fancy_pypi_readme.__main__ import _maybe_load_hatch_toml, tomllib
 from hatch_fancy_pypi_readme._cli import cli_run
 
 from .utils import run
@@ -42,7 +42,9 @@ def test_missing_config(self):
 
         assert (
             "Missing configuration "
-            "(`[tool.hatch.metadata.hooks.fancy-pypi-readme]`)\n" == out
+            "(`[tool.hatch.metadata.hooks.fancy-pypi-readme]` in"
+            " pyproject.toml or `[metadata.hooks.fancy-pypi-readme]` in"
+            " hatch.toml)\n" == out
         )
 
     def test_ok(self):
@@ -79,14 +81,59 @@ def test_ok_redirect(self, tmp_path):
 
         assert out.read_text().startswith("# Level 1 Header")
 
+    def test_empty_explicit_hatch_toml(self, tmp_path):
+        """
+        Explicit empty hatch.toml is ignored.
+        """
+        hatch_toml = tmp_path / "hatch.toml"
+        hatch_toml.write_text("")
+
+        assert run(
+            "hatch_fancy_pypi_readme",
+            "tests/example_pyproject.toml",
+            f"--hatch-toml={hatch_toml.resolve()}",
+        ).startswith("# Level 1 Header")
+
+    def test_config_in_hatch_toml(self, tmp_path, monkeypatch):
+        """
+        Implicit empty hatch.toml is used.
+        """
+        pyproject = tmp_path / "pyproject.toml"
+        pyproject.write_text(
+            """\
+[build-system]
+requires = ["hatchling", "hatch-fancy-pypi-readme"]
+build-backend = "hatchling.build"
+
+[project]
+name = "my-pkg"
+version = "1.0"
+dynamic = ["readme"]
+"""
+        )
+        hatch_toml = tmp_path / "hatch.toml"
+        hatch_toml.write_text(
+            """\
+[metadata.hooks.fancy-pypi-readme]
+content-type = "text/markdown"
+
+[[metadata.hooks.fancy-pypi-readme.fragments]]
+text = '# Level 1 Header'
+"""
+        )
+
+        monkeypatch.chdir(tmp_path)
+
+        assert run("hatch_fancy_pypi_readme").startswith("# Level 1 Header")
+
 
 class TestCLI:
     def test_cli_run_missing_dynamic(self, capfd):
         """
         Missing readme in dynamic is caught and gives helpful advice.
         """
         with pytest.raises(SystemExit):
-            cli_run({}, sys.stdout)
+            cli_run({}, {}, sys.stdout)
 
         out, err = capfd.readouterr()
 
@@ -99,14 +146,49 @@ def test_cli_run_missing_config(self, capfd):
         """
         with pytest.raises(SystemExit):
             cli_run(
-                {"project": {"dynamic": ["foo", "readme", "bar"]}}, sys.stdout
+                {"project": {"dynamic": ["foo", "readme", "bar"]}},
+                {},
+                sys.stdout,
             )
 
         out, err = capfd.readouterr()
 
         assert (
             "Missing configuration "
-            "(`[tool.hatch.metadata.hooks.fancy-pypi-readme]`)\n" == err
+            "(`[tool.hatch.metadata.hooks.fancy-pypi-readme]` in"
+            " pyproject.toml or `[metadata.hooks.fancy-pypi-readme]` in"
+            " hatch.toml)\n" == err
+        )
+        assert "" == out
+
+    def test_cli_run_two_configs(self, capfd):
+        """
+        Ambiguous two configs.
+        """
+        meta = {
+            "metadata": {
+                "hooks": {
+                    "fancy-pypi-readme": {"content-type": "text/markdown"}
+                }
+            }
+        }
+        with pytest.raises(SystemExit):
+            cli_run(
+                {
+                    "project": {
+                        "dynamic": ["foo", "readme", "bar"],
+                    },
+                    "tool": {"hatch": meta},
+                },
+                meta,
+                sys.stdout,
+            )
+
+        out, err = capfd.readouterr()
+
+        assert (
+            "Both pyproject.toml and hatch.toml contain "
+            "hatch-fancy-pypi-readme configuration.\n" == err
         )
         assert "" == out
 
@@ -115,7 +197,7 @@ def test_cli_run_config_error(self, capfd, empty_pyproject):
         Configuration errors are detected and give helpful advice.
         """
         with pytest.raises(SystemExit):
-            cli_run(empty_pyproject, sys.stdout)
+            cli_run(empty_pyproject, {}, sys.stdout)
 
         out, err = capfd.readouterr()
 
@@ -134,10 +216,49 @@ def test_cli_run_ok(self, capfd, pyproject):
         """
         sio = StringIO()
 
-        cli_run(pyproject, sio)
+        cli_run(pyproject, {}, sio)
 
         out, err = capfd.readouterr()
 
         assert "" == err
         assert "" == out
         assert sio.getvalue().startswith("# Level 1 Header")
+
+
+class TestMaybeLoadHatchToml:
+    def test_none(self, tmp_path, monkeypatch):
+        """
+        If nothing is passed and not hatch.toml is found, return empty dict.
+        """
+        monkeypatch.chdir(tmp_path)
+
+        assert {} == _maybe_load_hatch_toml(None)
+
+    def test_explicit(self, tmp_path, monkeypatch):
+        """
+        If one is passed, return its parsed content and ignore files called
+        hatch.toml.
+        """
+        monkeypatch.chdir(tmp_path)
+
+        hatch_toml = tmp_path / "hatch.toml"
+        hatch_toml.write_text("gibberish")
+
+        not_hatch_toml = tmp_path / "not-hatch.toml"
+        not_hatch_toml.write_text("[foo]\nbar='qux'")
+
+        assert {"foo": {"bar": "qux"}} == _maybe_load_hatch_toml(
+            str(not_hatch_toml)
+        )
+
+    def test_implicit(self, tmp_path, monkeypatch):
+        """
+        If none is passed, but a hatch.toml is present in current dir, parse
+        it.
+        """
+        monkeypatch.chdir(tmp_path)
+
+        hatch_toml = tmp_path / "hatch.toml"
+        hatch_toml.write_text("[foo]\nbar='qux'")
+
+        assert {"foo": {"bar": "qux"}} == _maybe_load_hatch_toml(None)