[#181] Remove the scripts.main.load_conf() function

Instead of using this function to get the config and add attributes to it, we
now separately get the config with load_conf_file() and pass attributes to
Spark. I've translated some of the tests for load_conf() to tests for
load_conf_file().

hlink/scripts/main.py

@@ -32,52 +32,6 @@
 logger = logging.getLogger(__name__)
 
 
-def load_conf(conf_name: str, user: str) -> tuple[Path, dict[str, Any]]:
-    """Load and return the hlink config dictionary.
-
-    Add the following attributes to the config dictionary:
-    "derby_dir", "warehouse_dir", "spark_tmp_dir", "log_dir", "python",
-    "conf_path", "run_name"
-    """
-    if "HLINK_CONF" not in os.environ:
-        global_conf = None
-    else:
-        global_conf_file = os.environ["HLINK_CONF"]
-        with open(global_conf_file) as f:
-            global_conf = json.load(f)
-
-    run_name = Path(conf_name).stem
-
-    if global_conf is None:
-        current_dir = Path.cwd()
-        hlink_dir = current_dir / "hlink_config"
-        base_derby_dir = hlink_dir / "derby"
-        base_warehouse_dir = hlink_dir / "warehouse"
-        base_spark_tmp_dir = hlink_dir / "spark_tmp_dir"
-        path, conf = load_conf_file(conf_name)
-
-        conf["derby_dir"] = base_derby_dir / run_name
-        conf["warehouse_dir"] = base_warehouse_dir / run_name
-        conf["spark_tmp_dir"] = base_spark_tmp_dir / run_name
-        conf["log_dir"] = hlink_dir / "logs"
-        conf["python"] = sys.executable
-    else:
-        user_dir = Path(global_conf["users_dir"]) / user
-        user_dir_fast = Path(global_conf["users_dir_fast"]) / user
-        conf_dir = user_dir / "confs"
-        conf_path = conf_dir / conf_name
-        path, conf = load_conf_file(str(conf_path))
-
-        conf["derby_dir"] = user_dir / "derby" / run_name
-        conf["warehouse_dir"] = user_dir_fast / "warehouse" / run_name
-        conf["spark_tmp_dir"] = user_dir_fast / "tmp" / run_name
-        conf["log_dir"] = user_dir / "logs"
-        conf["python"] = global_conf["python"]
-
-    conf["run_name"] = run_name
-    return path, conf
-
-
 def cli():
     """Called by the hlink script."""
     if "--version" in sys.argv:

hlink/tests/config_loader_test.py

@@ -3,23 +3,50 @@
 # in this project's top-level directory, and also on-line at:
 #   https://github.com/ipums/hlink
 
+from pathlib import Path
+
+import pytest
+
 from hlink.configs.load_config import load_conf_file
-import os.path
+from hlink.errors import UsageError
 
 
-def test_load_conf_file_json(conf_dir_path):
-    conf_file = os.path.join(conf_dir_path, "test")
-    _path, conf = load_conf_file(conf_file)
+@pytest.mark.parametrize("file_name", ["test", "test.json"])
+def test_load_conf_file_json(conf_dir_path: str, file_name: str) -> None:
+    conf_file = Path(conf_dir_path) / file_name
+    path, conf = load_conf_file(str(conf_file))
     assert conf["id_column"] == "id"
+    assert path == conf_file.with_suffix(".json")
 
 
-def test_load_conf_file_toml(conf_dir_path):
-    conf_file = os.path.join(conf_dir_path, "test1")
-    _path, conf = load_conf_file(conf_file)
+@pytest.mark.parametrize("file_name", ["test1", "test1.toml"])
+def test_load_conf_file_toml(conf_dir_path: str, file_name: str) -> None:
+    conf_file = Path(conf_dir_path) / file_name
+    path, conf = load_conf_file(str(conf_file))
     assert conf["id_column"] == "id-toml"
+    assert path == conf_file.with_suffix(".toml")
 
 
-def test_load_conf_file_json2(conf_dir_path):
-    conf_file = os.path.join(conf_dir_path, "test_conf_flag_run")
-    _path, conf = load_conf_file(conf_file)
+def test_load_conf_file_json2(conf_dir_path: str) -> None:
+    conf_file = Path(conf_dir_path) / "test_conf_flag_run"
+    path, conf = load_conf_file(str(conf_file))
     assert conf["id_column"] == "id_conf_flag"
+    assert path == conf_file.with_suffix(".json")
+
+
+def test_load_conf_file_does_not_exist(tmp_path: Path) -> None:
+    conf_file = tmp_path / "notthere"
+    with pytest.raises(
+        FileNotFoundError, match="Couldn't find any of these three files:"
+    ):
+        load_conf_file(str(conf_file))
+
+
+def test_load_conf_file_unrecognized_extension(tmp_path: Path) -> None:
+    conf_file = tmp_path / "test.yaml"
+    conf_file.touch()
+    with pytest.raises(
+        UsageError,
+        match="The file .+ exists, but it doesn't have a '.toml' or '.json' extension",
+    ):
+        load_conf_file(str(conf_file))