Adjust the binary_sensor icon according to sensor_class

This makes us call stateIcon() from computeIcon() instead of domainIcon(),
and breaks out the actual icon determination logic into a separate function.

I tested with a sensor in a card and a badge and it looks good.

src/components/entity/ha-state-label-badge.js

@@ -2,6 +2,7 @@ import Polymer from '../../polymer';
 import hass from '../../util/home-assistant-js-instance';
 import domainIcon from '../../util/domain-icon';
 import canToggle from '../../util/can-toggle';
+import stateIcon from '../../util/state-icon';
 
 require('../../components/ha-label-badge');
 
@@ -84,7 +85,7 @@ export default new Polymer({
       case 'scene':
       case 'updater':
       case 'script':
-        return domainIcon(state.domain, state.state);
+        return stateIcon(state);
       case 'sun':
         return state.state === 'above_horizon' ?
         domainIcon(state.domain) : 'mdi:brightness-3';

src/util/state-icon.js

@@ -4,6 +4,26 @@ import hass from './home-assistant-js-instance';
 
 const { util: { temperatureUnits } } = hass;
 
+function binarySensorIcon(state) {
+  const activated = state.state && state.state === 'off';
+  switch (state.attributes.sensor_class) {
+    case 'opening':
+      return activated ? 'mdi:crop-square' : 'mdi:exit-to-app';
+    case 'moisture':
+      return activated ? 'mdi:water-off' : 'mdi:water';
+    case 'safety':
+    case 'gas':
+    case 'smoke':
+    case 'power':
+      return activated ? 'mdi:verified' : 'mdi:alert';
+    case 'motion':
+      return activated ? 'mdi:walk' : 'mdi:run';
+    case 'digital':
+    default:
+      return activated ? 'mdi:radiobox-blank' : 'mdi:checkbox-marked-circle';
+  }
+}
+
 export default function stateIcon(state) {
   if (!state) {
     return defaultIcon;
@@ -20,6 +40,8 @@ export default function stateIcon(state) {
     } else if (unit === 'Mice') {
       return 'mdi:mouse-variant';
     }
+  } else if (state.domain === 'binary_sensor') {
+    return binarySensorIcon(state);
   }
 
   return domainIcon(state.domain, state.state);