Add multiply template filter

homeassistant/util/template.py

@@ -10,16 +10,25 @@ from jinja2.sandbox import SandboxedEnvironment
 ENV = SandboxedEnvironment()
 
 
-def forgiving_round(value, precision):
+def forgiving_round(value, precision=0):
     """ Rounding method that accepts strings. """
     try:
-        return round(float(value), precision)
+        return int(value) if precision == 0 else round(float(value), precision)
     except ValueError:
         # If value can't be converted to float
         return value
 
 
+def multiply(value, amount):
+    """ Converts to float and multiplies value. """
+    try:
+        return float(value) * amount
+    except ValueError:
+        # If value can't be converted to float
+        return value
+
 ENV.filters['round'] = forgiving_round
+ENV.filters['multiply'] = multiply
 
 
 def render(hass, template):

tests/util/test_template.py

@@ -55,3 +55,12 @@ class TestUtilTemplate(unittest.TestCase):
             template.render(
                 self.hass,
                 '{{ states.sensor.temperature.state | round(1) }}'))
+
+    def test_rounding_value2(self):
+        self.hass.states.set('sensor.temperature', 12.34)
+
+        self.assertEqual(
+            '123',
+            template.render(
+                self.hass,
+                '{{ states.sensor.temperature.state | multiply(10) | round }}'))