Add Template selector (#70229)

homeassistant/helpers/selector.py

@@ -765,6 +765,28 @@ class TargetSelector(Selector):
         return target
 
 
+class TemplateSelectorConfig(TypedDict):
+    """Class to represent an template selector config."""
+
+
+@SELECTORS.register("template")
+class TemplateSelector(Selector):
+    """Selector for an template."""
+
+    selector_type = "template"
+
+    CONFIG_SCHEMA = vol.Schema({})
+
+    def __init__(self, config: TemplateSelectorConfig | None = None) -> None:
+        """Instantiate a selector."""
+        super().__init__(config)
+
+    def __call__(self, data: Any) -> str:
+        """Validate the passed selection."""
+        template = cv.template(data)
+        return template.template
+
+
 class TextSelectorConfig(TypedDict, total=False):
     """Class to represent a text selector config."""
 

tests/helpers/test_selector.py

@@ -627,3 +627,12 @@ def test_datetime_selector_schema(schema, valid_selections, invalid_selections):
     """Test datetime selector."""
 
     _test_selector("datetime", schema, valid_selections, invalid_selections)
+
+
+@pytest.mark.parametrize(
+    "schema,valid_selections,invalid_selections",
+    (({}, ("abc123", "{{ now() }}"), (None, "{{ incomplete }", "{% if True %}Hi!")),),
+)
+def test_template_selector_schema(schema, valid_selections, invalid_selections):
+    """Test template selector."""
+    _test_selector("template", schema, valid_selections, invalid_selections)