Replace localstorage with node_helper write to file

Seeing a bunch of weird issues with this data not saving through the
browser/electron, so let's just use a known-good method instead.

.gitignore

@@ -0,0 +1 @@
+saved.json

MMM-chores.js

@@ -17,6 +17,7 @@ Module.register("MMM-chores", {
 
     start() {
         this.doUpdate()
+        this.sendSocketNotification("CHORES_READY")
     },
 
     doUpdate() {
@@ -49,6 +50,17 @@ Module.register("MMM-chores", {
         return wrapper
     },
 
+    socketNotificationReceived(notification, payload) {
+        if (notification === "CHORES_DATA_READ") {
+            for (const v in payload) {
+                const elem = document.getElementById(v)
+                if (elem) {
+                    elem.checked = payload[v] === 1
+                }
+            }
+        }
+    },
+
     getDateString(date) {
         var td = String(date.getDate()).padStart(2, '0')
         var tm = String(date.getMonth() + 1).padStart(2, '0')
@@ -71,11 +83,11 @@ Module.register("MMM-chores", {
         if (id !== undefined) {
             cb.id = id
         }
-        if (parseInt(localStorage.getItem(cb.id), 10)) {
-            cb.checked = true
-        }
         cb.onclick = (ev) => {
-            localStorage.setItem(ev.target.id, cb.checked ? 1 : 0)
+            let targetId = ev.target.id
+            let val = cb.checked ? 1 : 0
+            this.sendSocketNotification("CHORES_ADD_DATA", { "key": targetId, "val": val })
+
             const numItems = 2
             const randVal = Math.floor(Math.random() * 1000)
             if (this.config.showConfetti && cb.checked) {

node_helper.js

@@ -0,0 +1,43 @@
+const NodeHelper = require("node_helper");
+const path = require("path");
+const fs = require("fs");
+const filename = "/saved.json";
+var configFilename = path.resolve(__dirname + filename);
+
+module.exports = NodeHelper.create({
+    start() {
+        console.log("##### Starting node helper for: " + this.name);
+
+        fs.readFile(configFilename, (err, data) => {
+            if (err) {
+                if (err.code === 'ENOENT') {
+                    return;
+                }
+
+                throw err;
+            }
+
+            this.saved_data = JSON.parse(data);
+        });
+    },
+
+    writeToFile(data) {
+        var json = JSON.stringify(data);
+        fs.writeFileSync(configFilename, json, "utf8");
+    },
+
+    socketNotificationReceived(notification, payload) {
+        if (notification === "CHORES_ADD_DATA") {
+            if (!this.saved_data) {
+                this.saved_data = {}
+            }
+
+            this.saved_data[payload.key] = payload.val
+            this.writeToFile(this.saved_data)
+        } else if (notification === "CHORES_READY") {
+            if (this.saved_data) {
+                this.sendSocketNotification("CHORES_DATA_READ", this.saved_data)
+            }
+        }
+    }
+});