Add a command line tool to generate OAS in a file

demo/__main__.py

@@ -1,25 +1,5 @@
 from aiohttp import web
-from aiohttp.web import middleware
 
-from aiohttp_pydantic import oas
-
-from .model import Model
-from .view import PetCollectionView, PetItemView
-
-
-@middleware
-async def pet_not_found_to_404(request, handler):
-    try:
-        return await handler(request)
-    except Model.NotFound as key:
-        return web.json_response({"error": f"Pet {key} does not exist"}, status=404)
-
-
-app = web.Application(middlewares=[pet_not_found_to_404])
-oas.setup(app)
-
-app["model"] = Model()
-app.router.add_view("/pets", PetCollectionView)
-app.router.add_view("/pets/{id}", PetItemView)
+from .main import app
 
 web.run_app(app)

demo/main.py

@@ -0,0 +1,22 @@
+from aiohttp.web import Application, json_response, middleware
+
+from aiohttp_pydantic import oas
+
+from .model import Model
+from .view import PetCollectionView, PetItemView
+
+
+@middleware
+async def pet_not_found_to_404(request, handler):
+    try:
+        return await handler(request)
+    except Model.NotFound as key:
+        return json_response({"error": f"Pet {key} does not exist"}, status=404)
+
+
+app = Application(middlewares=[pet_not_found_to_404])
+oas.setup(app)
+
+app["model"] = Model()
+app.router.add_view("/pets", PetCollectionView)
+app.router.add_view("/pets/{id}", PetItemView)