Add entry point to enable installing with pipx or uvx (#211)

* Add entry point to enable installing with pipx or uvx

* Tests added for running the module and calling the entry point.

* Add return type annotation

* reformat

* Try adding BINDIR to python and entry point

* Add missing BINDIR paths

* Add docstring to test.

Author: RandallPittmanOrSt

setup.py

@@ -30,4 +30,7 @@
     package_data={"": ["py.typed"]},
     use_calver="%Y.%m.%d.%H",
     setup_requires=["calver"],
+    entry_points={
+        "console_scripts": ["trove-classifiers=trove_classifiers.__main__:cli"],
+    },
 )

src/trove_classifiers/__main__.py

@@ -1,4 +1,10 @@
 from trove_classifiers import sorted_classifiers
 
-for classifier in sorted_classifiers:
-    print(classifier)
+
+def cli() -> None:
+    for classifier in sorted_classifiers:
+        print(classifier)
+
+
+if __name__ == "__main__":
+    cli()

tests/test_cli.py

@@ -0,0 +1,32 @@
+"""test_cli.py - Tests to confirm that the CLI works and that both running the module and
+calling the entry point produce equivalent output.
+"""
+
+import subprocess
+import sys
+from pathlib import Path
+
+BINDIR = Path(sys.executable).parent
+
+
+def test_module_run():
+    """Simple test for no error when running the module. Output is not validated."""
+    subprocess.check_call([f"{BINDIR}/python", "-m", "trove_classifiers"])
+
+
+def test_entry_point():
+    """Simple test for no error when calling the entry point. Output is not validated."""
+    subprocess.check_call(f"{BINDIR}/trove-classifiers")
+
+
+def test_module_run_is_entry_point():
+    """Compare that module run output is the same as entry point output."""
+    module_run_proc = subprocess.run(
+        [f"{BINDIR}/python", "-m", "trove_classifiers"],
+        capture_output=True,
+        encoding="utf-8",
+    )
+    entry_point_proc = subprocess.run(
+        f"{BINDIR}/trove-classifiers", capture_output=True, encoding="utf-8"
+    )
+    assert module_run_proc.stdout == entry_point_proc.stdout