Allow app-dir parameter on the run() function (#1271)

* Allow app-dir parameter on the run() function

* Add default value to pop() call

* Update GitHub templates with new forms

* Add test

tests/test_cli.py

@@ -3,6 +3,7 @@
 import platform
 import sys
 from pathlib import Path
+from textwrap import dedent
 from unittest import mock
 
 import pytest
@@ -159,3 +160,25 @@ def test_mistmatch_env_variables(load_env_h11_protocol: None):
         runner.invoke(cli, ["tests.test_cli:App", "--http=httptools"])
         _, kwargs = mock_run.call_args
         assert kwargs["http"] == "httptools"
+
+
+def test_app_dir(tmp_path: Path, caplog: pytest.LogCaptureFixture) -> None:
+    app_dir = tmp_path / "dir" / "app_dir"
+    app_file = app_dir / "main.py"
+    app_dir.mkdir(parents=True)
+    app_file.touch()
+    app_file.write_text(
+        dedent(
+            """
+            async def app(scope, receive, send):
+                ...
+            """
+        )
+    )
+    runner = CliRunner()
+    with mock.patch.object(Server, "run") as mock_run:
+        result = runner.invoke(cli, ["main:app", "--app-dir", f"{str(app_dir)}"])
+
+    assert result.exit_code == 3
+    mock_run.assert_called_once()
+    assert sys.path[0] == str(app_dir)

uvicorn/main.py

@@ -320,7 +320,6 @@ def print_version(ctx: click.Context, param: click.Parameter, value: bool) -> No
 )
 @click.option(
     "--app-dir",
-    "app_dir",
     default=".",
     show_default=True,
     help="Look for APP in the specified directory, by adding this to the PYTHONPATH."
@@ -379,8 +378,6 @@ def main(
     app_dir: str,
     factory: bool,
 ) -> None:
-    sys.path.insert(0, app_dir)
-
     kwargs = {
         "host": host,
         "port": port,
@@ -424,11 +421,16 @@ def main(
         "headers": [header.split(":", 1) for header in headers],
         "use_colors": use_colors,
         "factory": factory,
+        "app_dir": app_dir,
     }
     run(app, **kwargs)
 
 
 def run(app: typing.Union[ASGIApplication, str], **kwargs: typing.Any) -> None:
+    app_dir = kwargs.pop("app_dir", None)
+    if app_dir is not None:
+        sys.path.insert(0, app_dir)
+
     config = Config(app, **kwargs)
     server = Server(config=config)