drained: restore normal operation on sufficient charge

apps/drained/app.ts

@@ -81,12 +81,22 @@ draw();
 Bangle.emit("drained", E.getBattery());
 
 // restore normal boot on charge
-const { disableBoot = false }: DrainedSettings
+const { disableBoot = false, restore = 20 }: DrainedSettings
   = require("Storage").readJSON(`${app}.setting.json`, true) || {};
 
+// re-enable normal boot code when we're above a threshold:
 if(disableBoot){
+  const checkCharge = () => {
+    if(E.getBattery() < restore) return;
+
+    eval(require('Storage').read('bootupdate.js'));
+    load(); // necessary after updating boot.0
+  };
+
+  if (Bangle.isCharging())
+    checkCharge();
+
   Bangle.on("charging", charging => {
-    if (charging)
-      eval(require('Storage').read('bootupdate.js'));
+    if(charging) checkCharge();
   });
 }

apps/drained/settings.ts

@@ -1,5 +1,6 @@
 type DrainedSettings = {
   battery?: number,
+  restore?: number,
   interval?: number,
   disableBoot?: ShortBoolean,
 };
@@ -10,6 +11,7 @@ type DrainedSettings = {
   const storage = require("Storage")
   const settings: DrainedSettings = storage.readJSON(SETTINGS_FILE, true) || {};
   settings.battery ??= 5;
+  settings.restore ??= 20;
   settings.interval ??= 10;
   settings.disableBoot ??= false;
 
@@ -50,5 +52,16 @@ type DrainedSettings = {
         save();
       },
     },
+    "Restore watch at %": {
+      value: settings.restore,
+      min: 0,
+      max: 95,
+      step: 5,
+      format: (v: number) => `${v}%`,
+      onchange: (v: number) => {
+        settings.restore = v;
+        save();
+      },
+    },
   });
 })