Add --app-dir option for running uvicorn from any location

docs/deployment.md

@@ -87,6 +87,7 @@ Options:
                                   [default: TLSv1]
   --header TEXT                   Specify custom default HTTP response headers
                                   as a Name:Value pair
+  --app-dir TEXT                  Specifty application directory.
   --help                          Show this message and exit.
 ```
 

docs/settings.md

@@ -8,6 +8,7 @@ equivalent keyword arguments, eg. `uvicorn.run("example:app", port=5000, reload=
 ## Application
 
 * `APP` - The ASGI application to run, in the format `"<module>:<attribute>"`.
+* `--app-dir <str>` - Specifty application directory.
 
 ## Socket Binding
 

uvicorn/main.py

@@ -256,6 +256,9 @@ def print_version(ctx, param, value):
     is_eager=True,
     help="Display the uvicorn version and exit.",
 )
+@click.option(
+    "--app-dir", "app_dir", default=".", help="Specifty application directory."
+)
 def main(
     app,
     host: str,
@@ -290,8 +293,9 @@ def main(
     ssl_ciphers: str,
     headers: typing.List[str],
     use_colors: bool,
+    app_dir: str,
 ):
-    sys.path.insert(0, ".")
+    sys.path.insert(0, app_dir)
 
     kwargs = {
         "app": app,