drained: configure battery% and check interval

apps/drained/README.md

@@ -7,6 +7,7 @@ With this app installed, your Bangle will automatically switch into low power mo
 ## Time
 - [x] Show simple date/time
 - [ ] Disable alarms - with a setting?
+- [ ] Smarter/backoff interval for checking battery percentage
 
 ## No backlight (#2502)
 - [x] LCD brightness

apps/drained/boot.ts

@@ -1,8 +1,11 @@
+const { battery = 5, interval = 10 } = require("Storage")
+  .readJSON(`${app}.setting.json`, true) || {};
+
 let drainedInterval: number | undefined = setInterval(() => {
   if(Bangle.isCharging())
     return;
-  if(E.getBattery() > 5)
+  if(E.getBattery() > battery)
     return;
 
   load("drained.app.js");
-}, 5 * 60 * 1000);
+}, interval * 60 * 1000);

apps/drained/metadata.json

@@ -11,6 +11,7 @@
   "allow_emulator": true,
   "storage": [
     {"name":"drained.boot.js","url":"boot.js"},
-    {"name":"drained.app.js","url":"app.js"}
+    {"name":"drained.app.js","url":"app.js"},
+    {"name":"drained.settings.js","url":"settings.js"}
   ]
 }

apps/drained/settings.ts

@@ -0,0 +1,37 @@
+((back: () => void) => {
+  const SETTINGS_FILE = "drained.setting.json";
+
+  const storage = require("Storage")
+  const settings = storage.readJSON(SETTINGS_FILE, true) || {};
+  settings.battery ??= 5;
+  settings.interval ??= 10;
+
+  const save = () => {
+    storage.writeJSON(SETTINGS_FILE, settings)
+  };
+
+  E.showMenu({
+    "": { "title": "Drained" },
+    "< Back": back,
+    "Trigger when battery reaches": {
+      value: settings.battery,
+      min: 0,
+      max: 95,
+      step: 5,
+      onchange: (v: number) => {
+        settings.battery = v;
+        save();
+      },
+    },
+    "Check every N minutes": {
+      value: settings.interval,
+      min: 1,
+      max: 60 * 2,
+      step: 5,
+      onchange: (v: number) => {
+        settings.interval = v;
+        save();
+      },
+    },
+  });
+})