Add wait_for_trigger script action (#38075)

* Add wait_for_trigger script action

* Add tests

* Change script integration to use config validator

homeassistant/components/script/config.py

@@ -0,0 +1,50 @@
+"""Config validation helper for the script integration."""
+import asyncio
+
+import voluptuous as vol
+
+from homeassistant.config import async_log_exception
+from homeassistant.const import CONF_SEQUENCE
+from homeassistant.exceptions import HomeAssistantError
+from homeassistant.helpers import config_validation as cv
+from homeassistant.helpers.script import async_validate_action_config
+
+from . import DOMAIN, SCRIPT_ENTRY_SCHEMA
+
+
+async def async_validate_config_item(hass, config, full_config=None):
+    """Validate config item."""
+    config = SCRIPT_ENTRY_SCHEMA(config)
+    config[CONF_SEQUENCE] = await asyncio.gather(
+        *[
+            async_validate_action_config(hass, action)
+            for action in config[CONF_SEQUENCE]
+        ]
+    )
+
+    return config
+
+
+async def _try_async_validate_config_item(hass, object_id, config, full_config=None):
+    """Validate config item."""
+    try:
+        cv.slug(object_id)
+        config = await async_validate_config_item(hass, config, full_config)
+    except (vol.Invalid, HomeAssistantError) as ex:
+        async_log_exception(ex, DOMAIN, full_config or config, hass)
+        return None
+
+    return config
+
+
+async def async_validate_config(hass, config):
+    """Validate config."""
+    if DOMAIN in config:
+        validated_config = {}
+        for object_id, cfg in config[DOMAIN].items():
+            cfg = await _try_async_validate_config_item(hass, object_id, cfg, config)
+            if cfg is not None:
+                validated_config[object_id] = cfg
+        config[DOMAIN] = validated_config
+
+    return config