Allow embedded platforms (home-assistant#19948)

* Allow embedded platforms

* Fix test

homeassistant/const.py

@@ -8,7 +8,7 @@
 REQUIRED_PYTHON_VER = (3, 5, 3)
 
 # Format for platforms
-PLATFORM_FORMAT = '{}.{}'
+PLATFORM_FORMAT = '{domain}.{platform}'
 
 # Can be used to specify a catch all when registering state or event listeners.
 MATCH_ALL = '*'

homeassistant/loader.py

@@ -52,18 +52,43 @@ def set_component(hass,  # type: HomeAssistant
 
 
 def get_platform(hass,  # type: HomeAssistant
-                 domain: str, platform: str) -> Optional[ModuleType]:
+                 domain: str, platform_name: str) -> Optional[ModuleType]:
     """Try to load specified platform.
 
     Async friendly.
     """
-    return get_component(hass, PLATFORM_FORMAT.format(domain, platform))
+    platform = _load_file(hass, PLATFORM_FORMAT.format(
+        domain=domain, platform=platform_name))
+
+    if platform is None:
+        # Turn it around for legacy purposes
+        platform = _load_file(hass, PLATFORM_FORMAT.format(
+            domain=platform_name, platform=domain))
+
+    if platform is None:
+        _LOGGER.error("Unable to find platform %s", platform_name)
+
+    return platform
 
 
 def get_component(hass,  # type: HomeAssistant
                   comp_or_platform: str) -> Optional[ModuleType]:
     """Try to load specified component.
 
+    Async friendly.
+    """
+    comp = _load_file(hass, comp_or_platform)
+
+    if comp is None:
+        _LOGGER.error("Unable to find component %s", comp_or_platform)
+
+    return comp
+
+
+def _load_file(hass,  # type: HomeAssistant
+               comp_or_platform: str) -> Optional[ModuleType]:
+    """Try to load specified file.
+
     Looks in config dir first, then built-in components.
     Only returns it if also found to be valid.
     Async friendly.
@@ -134,8 +159,6 @@ def get_component(hass,  # type: HomeAssistant
                     ("Error loading %s. Make sure all "
                      "dependencies are installed"), path)
 
-    _LOGGER.error("Unable to find component %s", comp_or_platform)
-
     return None
 
 

homeassistant/setup.py

@@ -190,7 +190,8 @@ async def async_prepare_setup_platform(hass: core.HomeAssistant, config: Dict,
 
     This method is a coroutine.
     """
-    platform_path = PLATFORM_FORMAT.format(domain, platform_name)
+    platform_path = PLATFORM_FORMAT.format(domain=domain,
+                                           platform=platform_name)
 
     def log_error(msg: str) -> None:
         """Log helper."""

tests/components/light/test_hue.py → tests/components/hue/test_light.py

@@ -11,7 +11,7 @@
 
 from homeassistant import config_entries
 from homeassistant.components import hue
-import homeassistant.components.light.hue as hue_light
+from homeassistant.components.hue import light as hue_light
 from homeassistant.util import color
 
 _LOGGER = logging.getLogger(__name__)

tests/test_loader.py

@@ -35,7 +35,6 @@ def test_set_component(self):
     def test_get_component(self):
         """Test if get_component works."""
         assert http == loader.get_component(self.hass, 'http')
-        assert loader.get_component(self.hass, 'light.hue') is not None
 
     def test_load_order_component(self):
         """Test if we can get the proper load order of components."""