power_usage: add module

modules/power_usage.js

@@ -0,0 +1,15 @@
+exports.get = function () {
+    var pwr = E.getPowerUsage();
+    var batt = E.getBattery();
+    var usage = 0;
+    for (var key in pwr.device) {
+        if (!/^(LCD|LED)/.test(key))
+            usage += pwr.device[key];
+    }
+    var hrsLeft = 175000 * batt / (100 * usage);
+    return {
+        usage: usage,
+        hrsLeft: hrsLeft,
+        batt: batt,
+    };
+};

modules/power_usage.ts

@@ -0,0 +1,28 @@
+type PowerUsage = {
+	usage: number,
+	hrsLeft: number,
+	batt: number, // battery percentage
+};
+
+type PowerUsageModule = {
+	get: () => PowerUsage,
+};
+
+exports.get = (): PowerUsage => {
+		const pwr = E.getPowerUsage();
+		const batt = E.getBattery();
+		let usage = 0;
+		for(const key in pwr.device){
+			if(!/^(LCD|LED)/.test(key))
+				usage += pwr.device[key];
+		}
+
+		// 175mAh, scaled based on battery (batt/100), scaled down based on usage
+		const hrsLeft = 175000 * batt / (100 * usage);
+
+		return {
+			usage,
+			hrsLeft,
+			batt,
+		};
+};

typescript/types/modules.d.ts

@@ -5,3 +5,4 @@ declare function require(moduleName: "sched"): typeof Sched;
 declare function require(moduleName: "ClockFace"): typeof ClockFace_.ClockFace;
 declare function require(moduleName: "clock_info"): typeof ClockInfo;
 declare function require(moduleName: "Layout"): typeof Layout.Layout;
+declare function require(moduleName: "power_usage"): PowerUsageModule;