Add list areas function to template (home-assistant#88441)

homeassistant/helpers/template.py

@@ -1185,6 +1185,12 @@ def is_device_attr(
     return bool(device_attr(hass, device_or_entity_id, attr_name) == attr_value)
 
 
+def areas(hass: HomeAssistant) -> Iterable[str | None]:
+    """Return all areas."""
+    area_reg = area_registry.async_get(hass)
+    return [area.id for area in area_reg.async_list_areas()]
+
+
 def area_id(hass: HomeAssistant, lookup_value: str) -> str | None:
     """Get the area ID from an area name, device id, or entity id."""
     area_reg = area_registry.async_get(hass)
@@ -2183,6 +2189,9 @@ def wrapper(_: Any, *args: _P.args, **kwargs: _P.kwargs) -> _R:
         self.globals["device_id"] = hassfunction(device_id)
         self.filters["device_id"] = pass_context(self.globals["device_id"])
 
+        self.globals["areas"] = hassfunction(areas)
+        self.filters["areas"] = pass_context(self.globals["areas"])
+
         self.globals["area_id"] = hassfunction(area_id)
         self.filters["area_id"] = pass_context(self.globals["area_id"])
 

tests/helpers/test_template.py

@@ -2851,6 +2851,26 @@ async def test_device_attr(
     assert info.rate_limit is None
 
 
+async def test_areas(hass: HomeAssistant, area_registry: ar.AreaRegistry) -> None:
+    """Test areas function."""
+    # Test no areas
+    info = render_to_info(hass, "{{ areas() }}")
+    assert_result_info(info, [])
+    assert info.rate_limit is None
+
+    # Test one area
+    area1 = area_registry.async_get_or_create("area1")
+    info = render_to_info(hass, "{{ areas() }}")
+    assert_result_info(info, [area1.id])
+    assert info.rate_limit is None
+
+    # Test multiple areas
+    area2 = area_registry.async_get_or_create("area2")
+    info = render_to_info(hass, "{{ areas() }}")
+    assert_result_info(info, [area1.id, area2.id])
+    assert info.rate_limit is None
+
+
 async def test_area_id(
     hass: HomeAssistant,
     area_registry: ar.AreaRegistry,