be consistent with env var names

README.md

@@ -24,7 +24,7 @@ uv sync --all-groups
 uv run repub
 ```
 
-By default the UI listens on `127.0.0.1:8080`. You can override that with `REPUB_HOST` and `REPUB_PORT`, or with:
+By default the UI listens on `127.0.0.1:8080`. You can override that with `REPUBLISHER_HOST` and `REPUBLISHER_PORT`, or with:
 
 ```sh
 uv run repub serve --host 0.0.0.0 --port 8080

repub/entrypoint.py

@@ -34,12 +34,12 @@ def parse_args(argv: list[str] | None = None) -> tuple[str, argparse.Namespace]:
     serve_parser = subparsers.add_parser("serve", help="Start the republisher web UI")
     serve_parser.add_argument(
         "--host",
-        default=os.environ.get("REPUB_HOST", "127.0.0.1"),
+        default=os.environ.get("REPUBLISHER_HOST", "127.0.0.1"),
         help="Host interface for the web UI",
     )
     serve_parser.add_argument(
         "--port",
-        default=os.environ.get("REPUB_PORT", "8080"),
+        default=os.environ.get("REPUBLISHER_PORT", "8080"),
         help="Port for the web UI",
     )
 
@@ -72,7 +72,7 @@ def entrypoint(argv: list[str] | None = None) -> int:
     try:
         port = int(args.port)
     except ValueError:
-        logger.error("Invalid REPUB_PORT/--port value: %s", args.port)
+        logger.error("Invalid REPUBLISHER_PORT/--port value: %s", args.port)
         return 2
 
     app = create_app()

tests/test_entrypoint.py

@@ -1,6 +1,7 @@
+import io
 from types import SimpleNamespace
 
-from repub.entrypoint import FeedNameFilter
+from repub.entrypoint import FeedNameFilter, entrypoint, logger, parse_args
 
 
 def test_feed_name_filter_accepts_matching_item() -> None:
@@ -15,3 +16,31 @@ def test_feed_name_filter_rejects_non_matching_item() -> None:
     feed_filter = FeedNameFilter({"feed_name": "nasa"})
 
     assert feed_filter.accepts(item) is False
+
+
+def test_parse_args_uses_republisher_host_and_port_env_vars(monkeypatch) -> None:
+    monkeypatch.setenv("REPUBLISHER_HOST", "0.0.0.0")
+    monkeypatch.setenv("REPUBLISHER_PORT", "9090")
+
+    command, args = parse_args(["serve"])
+
+    assert command == "serve"
+    assert args.host == "0.0.0.0"
+    assert args.port == "9090"
+
+
+def test_entrypoint_rejects_invalid_republisher_port(monkeypatch) -> None:
+    monkeypatch.setenv("REPUBLISHER_PORT", "not-a-number")
+    stream = io.StringIO()
+    original_streams = [handler.stream for handler in logger.handlers]
+    for handler in logger.handlers:
+        handler.stream = stream
+
+    try:
+        exit_code = entrypoint(["serve"])
+    finally:
+        for handler, original_stream in zip(logger.handlers, original_streams):
+            handler.stream = original_stream
+
+    assert exit_code == 2
+    assert "Invalid REPUBLISHER_PORT/--port value" in stream.getvalue()