Use built-in Jinja min and max filters in templates (#60327)

* Use built-in Jinja min and max filters in templates

* use built-in filter for global

* lint

* less generic name

* more tests

* even more tests

homeassistant/helpers/template.py

@@ -24,7 +24,7 @@ from urllib.parse import urlencode as urllib_urlencode
 import weakref
 
 import jinja2
-from jinja2 import pass_context
+from jinja2 import pass_context, pass_environment
 from jinja2.sandbox import ImmutableSandboxedEnvironment
 from jinja2.utils import Namespace
 import voluptuous as vol
@@ -1525,6 +1525,30 @@ def fail_when_undefined(value):
     return value
 
 
+def min_max_from_filter(builtin_filter: Any, name: str) -> Any:
+    """
+    Convert a built-in min/max Jinja filter to a global function.
+
+    The parameters may be passed as an iterable or as separate arguments.
+    """
+
+    @pass_environment
+    @wraps(builtin_filter)
+    def wrapper(environment: jinja2.Environment, *args: Any, **kwargs: Any) -> Any:
+        if len(args) == 0:
+            raise TypeError(f"{name} expected at least 1 argument, got 0")
+
+        if len(args) == 1:
+            if isinstance(args[0], Iterable):
+                return builtin_filter(environment, args[0], **kwargs)
+
+            raise TypeError(f"'{type(args[0]).__name__}' object is not iterable")
+
+        return builtin_filter(environment, args, **kwargs)
+
+    return pass_environment(wrapper)
+
+
 def average(*args: Any) -> float:
     """
     Filter and function to calculate the arithmetic mean of an iterable or of two or more arguments.
@@ -1865,8 +1889,6 @@ class TemplateEnvironment(ImmutableSandboxedEnvironment):
         self.filters["from_json"] = from_json
         self.filters["is_defined"] = fail_when_undefined
         self.filters["average"] = average
-        self.filters["max"] = max
-        self.filters["min"] = min
         self.filters["random"] = random_every_time
         self.filters["base64_encode"] = base64_encode
         self.filters["base64_decode"] = base64_decode
@@ -1909,8 +1931,8 @@ class TemplateEnvironment(ImmutableSandboxedEnvironment):
         self.globals["strptime"] = strptime
         self.globals["urlencode"] = urlencode
         self.globals["average"] = average
-        self.globals["max"] = max
-        self.globals["min"] = min
+        self.globals["max"] = min_max_from_filter(self.filters["max"], "max")
+        self.globals["min"] = min_max_from_filter(self.filters["min"], "min")
         self.globals["is_number"] = is_number
         self.globals["int"] = forgiving_int
         self.globals["pack"] = struct_pack

tests/helpers/test_template.py

@@ -835,6 +835,15 @@ def test_min(hass):
     assert template.Template("{{ min([1, 2, 3]) }}", hass).async_render() == 1
     assert template.Template("{{ min(1, 2, 3) }}", hass).async_render() == 1
 
+    with pytest.raises(TemplateError):
+        template.Template("{{ 1 | min }}", hass).async_render()
+
+    with pytest.raises(TemplateError):
+        template.Template("{{ min() }}", hass).async_render()
+
+    with pytest.raises(TemplateError):
+        template.Template("{{ min(1) }}", hass).async_render()
+
 
 def test_max(hass):
     """Test the max filter."""
@@ -842,6 +851,82 @@ def test_max(hass):
     assert template.Template("{{ max([1, 2, 3]) }}", hass).async_render() == 3
     assert template.Template("{{ max(1, 2, 3) }}", hass).async_render() == 3
 
+    with pytest.raises(TemplateError):
+        template.Template("{{ 1 | max }}", hass).async_render()
+
+    with pytest.raises(TemplateError):
+        template.Template("{{ max() }}", hass).async_render()
+
+    with pytest.raises(TemplateError):
+        template.Template("{{ max(1) }}", hass).async_render()
+
+
+@pytest.mark.parametrize(
+    "attribute",
+    (
+        "a",
+        "b",
+        "c",
+    ),
+)
+def test_min_max_attribute(hass, attribute):
+    """Test the min and max filters with attribute."""
+    hass.states.async_set(
+        "test.object",
+        "test",
+        {
+            "objects": [
+                {
+                    "a": 1,
+                    "b": 2,
+                    "c": 3,
+                },
+                {
+                    "a": 2,
+                    "b": 1,
+                    "c": 2,
+                },
+                {
+                    "a": 3,
+                    "b": 3,
+                    "c": 1,
+                },
+            ],
+        },
+    )
+    assert (
+        template.Template(
+            "{{ (state_attr('test.object', 'objects') | min(attribute='%s'))['%s']}}"
+            % (attribute, attribute),
+            hass,
+        ).async_render()
+        == 1
+    )
+    assert (
+        template.Template(
+            "{{ (min(state_attr('test.object', 'objects'), attribute='%s'))['%s']}}"
+            % (attribute, attribute),
+            hass,
+        ).async_render()
+        == 1
+    )
+    assert (
+        template.Template(
+            "{{ (state_attr('test.object', 'objects') | max(attribute='%s'))['%s']}}"
+            % (attribute, attribute),
+            hass,
+        ).async_render()
+        == 3
+    )
+    assert (
+        template.Template(
+            "{{ (max(state_attr('test.object', 'objects'), attribute='%s'))['%s']}}"
+            % (attribute, attribute),
+            hass,
+        ).async_render()
+        == 3
+    )
+
 
 def test_ord(hass):
     """Test the ord filter."""