feat: add initial cli (#32)

Fixes #1

.github/workflows/docs.yml

@@ -34,6 +34,7 @@ jobs:
         path: ~/.cache/pip
     - name: Install pre-requisites (e.g. hatch)
       run: python -m pip install --require-hashes --requirement=.github/requirements/ci.txt
+    - run: hatch run docs:cli
     - run: hatch run docs:build
       if: github.event_name == 'pull_request'
     - run: |

.github/workflows/test.yml

@@ -27,7 +27,7 @@ jobs:
     - name: Install pre-requisites (e.g. hatch)
       run: python -m pip install --require-hashes --requirement=.github/requirements/ci.txt
     - name: Run test suite
-      run: hatch run cov
+      run: hatch run cov -s
     - name: Generate coverage report
       run: |
         export TOTAL_COV=$(hatch run cov-total)
@@ -70,7 +70,8 @@ jobs:
         python-version: '3.12'
         cache: pip
     - run: python -Im pip install --editable .[dev]
-    - run: python -Ic 'import re3data.__about__; print(re3data.__about__.__version__)'
+    - run: python -Ic 'import re3data; print(re3data.__version__)'
+    - run: re3data --version
     - name: Set up pipdeptree
       if: matrix.os == 'ubuntu-latest'
       run: python -m pip install --require-hashes --requirement=.github/requirements/ci.txt

.pre-commit-config.yaml

@@ -55,7 +55,7 @@ repos:
   hooks:
   - id: mdformat
     args: [--number, --wrap=120, --ignore-missing-references]
-    exclude: CHANGELOG.md|.changelog.md|docs/src/api
+    exclude: CHANGELOG.md|.changelog.md|docs/src/cli.md
     additional_dependencies:
     - mdformat-mkdocs[recommended]>=v2.0.7
 
@@ -73,7 +73,8 @@ repos:
     args: [--config-file=pyproject.toml]
     additional_dependencies:
     - httpx>=0.27
-    - pytest>=8.1
+    - pytest>=8.2
+    - typer>=0.12
 
 - repo: https://github.com/scientific-python/cookie
   rev: 28d1a53da26f9daff6d9a49c50260421ad6d05e0  # frozen: 2024.04.23

docs/mkdocs.yml

@@ -15,6 +15,7 @@ watch:
 
 nav:
 - Home: index.md
+- CLI Reference: cli.md
 - Meta:
   - Contributor Guide: contributing.md
   - License: license.md

docs/src/cli.md

@@ -0,0 +1,16 @@
+# CLI Reference
+
+python-re3data.
+
+**Usage**:
+
+```console
+$ re3data [OPTIONS] COMMAND [ARGS]...
+```
+
+**Options**:
+
+* `-V, --version`: Show python-re3data version and exit.
+* `--install-completion`: Install completion for the current shell.
+* `--show-completion`: Show completion for the current shell, to copy it or customize the installation.
+* `--help`: Show this message and exit.

pyproject.toml

@@ -49,6 +49,7 @@ optional-dependencies.cli = [
 ]
 optional-dependencies.dev = [
   "pre-commit~=3.7",
+  "python-re3data[cli]",
 ]
 optional-dependencies.docs = [
   "mike~=2.1",
@@ -112,10 +113,12 @@ cov-total = """
 
 [tool.hatch.envs.docs]
 features = [
+  "cli",
   "docs",
 ]
 template = "docs"
 [tool.hatch.envs.docs.scripts]
+cli = "typer src/re3data/_cli.py utils docs --name=re3data --title='CLI Reference' --output docs/src/cli.md"
 build = "mkdocs build --config-file=docs/mkdocs.yml"
 serve = "mkdocs serve --verbose --config-file=docs/mkdocs.yml"
 deploy = "mike deploy --push --update-aliases $(hatch version) latest --config-file=docs/mkdocs.yml"
@@ -220,6 +223,7 @@ source = [
 ]
 omit = [
   "__about__.py",
+  "__main__.py",
 ]
 
 [tool.coverage.report]

tests/test_version.py → src/re3data/__main__.py

@@ -2,8 +2,8 @@
 #
 # SPDX-License-Identifier: MIT
 
-from re3data import __version__
+"""Entry point for python-re3data."""
 
+from re3data._cli import app
 
-def test_version() -> None:
-    assert __version__
+app(prog_name="re3data")

src/re3data/_cli.py

@@ -0,0 +1,41 @@
+"""re3data command line interface."""
+
+import logging
+import sys
+import typing
+
+logger = logging.getLogger(__name__)
+
+try:
+    import typer
+except ImportError:
+    logger.error("`typer` is missing. Please run 'pip install python-re3data[cli]' to use the CLI.")
+    sys.exit(1)
+
+CONTEXT_SETTINGS = {"help_option_names": ["-h", "--help"]}
+
+app = typer.Typer(no_args_is_help=True, context_settings=CONTEXT_SETTINGS)
+
+
+def _version_callback(show_version: bool) -> None:
+    # Ref: https://typer.tiangolo.com/tutorial/options/version/
+    from re3data import __version__
+
+    if show_version:
+        typer.echo(f"{__version__}")
+        raise typer.Exit
+
+
+@app.callback(context_settings=CONTEXT_SETTINGS)
+def callback(
+    version: typing.Annotated[
+        bool,
+        typer.Option(
+            "--version",
+            "-V",
+            help="Show python-re3data version and exit.",
+            callback=_version_callback,
+        ),
+    ] = False,
+) -> None:
+    """python-re3data."""

tests/integration/test_cli.py

@@ -0,0 +1,52 @@
+# SPDX-FileCopyrightText: 2024 Heinz-Alexander Fütterer
+#
+# SPDX-License-Identifier: MIT
+
+import sys
+from importlib import reload
+from unittest.mock import patch
+
+import pytest
+from typer.testing import CliRunner
+
+from re3data import __version__
+from re3data._cli import app
+
+runner = CliRunner()
+
+HELP_OPTION_NAMES = ("-h", "--help")
+VERSION_OPTION_NAMES = ("-V", "--version")
+
+
+def test_no_args_displays_help() -> None:
+    result = runner.invoke(app)
+    assert result.exit_code == 0
+    assert "Usage" in result.output
+    assert "Options" in result.output
+    assert "Show this message and exit" in result.output
+
+
+@pytest.mark.parametrize("help_option_name", HELP_OPTION_NAMES)
+def test_help_option_displays_help(help_option_name: str) -> None:
+    result = runner.invoke(app, [help_option_name])
+    assert result.exit_code == 0
+    assert "Usage" in result.output
+    assert "Options" in result.output
+    assert "Show this message and exit" in result.output
+
+
+@pytest.mark.parametrize("version_option_name", VERSION_OPTION_NAMES)
+def test_version_option_displays_version(version_option_name: str) -> None:
+    result = runner.invoke(app, [version_option_name])
+    assert result.exit_code == 0
+    assert __version__ in result.output
+
+
+def test_typer_missing_message(caplog: pytest.LogCaptureFixture) -> None:
+    # act as if "typer" is not installed
+    with patch.dict(sys.modules, {"typer": None}):
+        with pytest.raises(SystemExit) as exc_info:
+            reload(sys.modules["re3data._cli"])
+        assert exc_info.type == SystemExit
+        assert exc_info.value.code == 1
+        assert "Please run 'pip install python-re3data[cli]'" in caplog.text