Add variable substitutions for !include (#3510)

esphome/components/substitutions/__init__.py

@@ -48,7 +48,7 @@ VARIABLE_PROG = re.compile(
 )
 
 
-def _expand_substitutions(substitutions, value, path):
+def _expand_substitutions(substitutions, value, path, ignore_missing):
     if "$" not in value:
         return value
 
@@ -66,13 +66,14 @@ def _expand_substitutions(substitutions, value, path):
         if name.startswith("{") and name.endswith("}"):
             name = name[1:-1]
         if name not in substitutions:
-            _LOGGER.warning(
-                "Found '%s' (see %s) which looks like a substitution, but '%s' was "
-                "not declared",
-                orig_value,
-                "->".join(str(x) for x in path),
-                name,
-            )
+            if not ignore_missing:
+                _LOGGER.warning(
+                    "Found '%s' (see %s) which looks like a substitution, but '%s' was "
+                    "not declared",
+                    orig_value,
+                    "->".join(str(x) for x in path),
+                    name,
+                )
             i = j
             continue
 
@@ -92,37 +93,37 @@ def _expand_substitutions(substitutions, value, path):
     return value
 
 
-def _substitute_item(substitutions, item, path):
+def _substitute_item(substitutions, item, path, ignore_missing):
     if isinstance(item, list):
         for i, it in enumerate(item):
-            sub = _substitute_item(substitutions, it, path + [i])
+            sub = _substitute_item(substitutions, it, path + [i], ignore_missing)
             if sub is not None:
                 item[i] = sub
     elif isinstance(item, dict):
         replace_keys = []
         for k, v in item.items():
             if path or k != CONF_SUBSTITUTIONS:
-                sub = _substitute_item(substitutions, k, path + [k])
+                sub = _substitute_item(substitutions, k, path + [k], ignore_missing)
                 if sub is not None:
                     replace_keys.append((k, sub))
-            sub = _substitute_item(substitutions, v, path + [k])
+            sub = _substitute_item(substitutions, v, path + [k], ignore_missing)
             if sub is not None:
                 item[k] = sub
         for old, new in replace_keys:
             item[new] = merge_config(item.get(old), item.get(new))
             del item[old]
     elif isinstance(item, str):
-        sub = _expand_substitutions(substitutions, item, path)
+        sub = _expand_substitutions(substitutions, item, path, ignore_missing)
         if sub != item:
             return sub
     elif isinstance(item, core.Lambda):
-        sub = _expand_substitutions(substitutions, item.value, path)
+        sub = _expand_substitutions(substitutions, item.value, path, ignore_missing)
         if sub != item:
             item.value = sub
     return None
 
 
-def do_substitution_pass(config, command_line_substitutions):
+def do_substitution_pass(config, command_line_substitutions, ignore_missing=False):
     if CONF_SUBSTITUTIONS not in config and not command_line_substitutions:
         return
 
@@ -151,4 +152,4 @@ def do_substitution_pass(config, command_line_substitutions):
     config[CONF_SUBSTITUTIONS] = substitutions
     # Move substitutions to the first place to replace substitutions in them correctly
     config.move_to_end(CONF_SUBSTITUTIONS, False)
-    _substitute_item(substitutions, config, [])
+    _substitute_item(substitutions, config, [], ignore_missing)

esphome/yaml_util.py

@@ -251,7 +251,49 @@ class ESPHomeLoader(yaml.SafeLoader):  # pylint: disable=too-many-ancestors
 
     @_add_data_ref
     def construct_include(self, node):
-        return _load_yaml_internal(self._rel_path(node.value))
+        def extract_file_vars(node):
+            fields = self.construct_yaml_map(node)
+            file = fields.get("file")
+            if file is None:
+                raise yaml.MarkedYAMLError("Must include 'file'", node.start_mark)
+            vars = fields.get("vars")
+            if vars:
+                vars = {k: str(v) for k, v in vars.items()}
+            return file, vars
+
+        def substitute_vars(config, vars):
+            from esphome.const import CONF_SUBSTITUTIONS
+            from esphome.components import substitutions
+
+            org_subs = None
+            result = config
+            if not isinstance(config, dict):
+                # when the included yaml contains a list or a scalar
+                # wrap it into an OrderedDict because do_substitution_pass expects it
+                result = OrderedDict([("yaml", config)])
+            elif CONF_SUBSTITUTIONS in result:
+                org_subs = result.pop(CONF_SUBSTITUTIONS)
+
+            result[CONF_SUBSTITUTIONS] = vars
+            # Ignore missing vars that refer to the top level substitutions
+            substitutions.do_substitution_pass(result, None, ignore_missing=True)
+            result.pop(CONF_SUBSTITUTIONS)
+
+            if not isinstance(config, dict):
+                result = result["yaml"]  # unwrap the result
+            elif org_subs:
+                result[CONF_SUBSTITUTIONS] = org_subs
+            return result
+
+        if isinstance(node, yaml.nodes.MappingNode):
+            file, vars = extract_file_vars(node)
+        else:
+            file, vars = node.value, None
+
+        result = _load_yaml_internal(self._rel_path(file))
+        if vars:
+            result = substitute_vars(result, vars)
+        return result
 
     @_add_data_ref
     def construct_include_dir_list(self, node):

tests/unit_tests/fixtures/yaml_util/includes/included.yaml

@@ -0,0 +1,2 @@
+---
+ssid: ${name}

tests/unit_tests/fixtures/yaml_util/includes/list.yaml

@@ -0,0 +1,2 @@
+---
+- ${var1}

tests/unit_tests/fixtures/yaml_util/includes/scalar.yaml

@@ -0,0 +1 @@
+${var1}

tests/unit_tests/fixtures/yaml_util/includetest.yaml

@@ -0,0 +1,17 @@
+---
+substitutions:
+  name: original
+
+wifi: !include
+  file: includes/included.yaml
+  vars:
+    name: my_custom_ssid
+
+esphome:
+  # should be substituted as 'original', not overwritten by vars in the !include above
+  name: ${name}
+  name_add_mac_suffix: true
+  platform: esp8266
+  board: !include { file: includes/scalar.yaml, vars: { var1: nodemcu } }
+
+  libraries: !include { file: includes/list.yaml, vars: { var1: Wire } }

tests/unit_tests/test_yaml_util.py

@@ -0,0 +1,13 @@
+from esphome import yaml_util
+from esphome.components import substitutions
+
+
+def test_include_with_vars(fixture_path):
+    yaml_file = fixture_path / "yaml_util" / "includetest.yaml"
+
+    actual = yaml_util.load_yaml(yaml_file)
+    substitutions.do_substitution_pass(actual, None)
+    assert actual["esphome"]["name"] == "original"
+    assert actual["esphome"]["libraries"][0] == "Wire"
+    assert actual["esphome"]["board"] == "nodemcu"
+    assert actual["wifi"]["ssid"] == "my_custom_ssid"