weather: delete stale weather data

apps.json

@@ -392,7 +392,8 @@
       {"name":"weather.app.js","url":"app.js"},
       {"name":"weather.wid.js","url":"widget.js"},
       {"name":"weather","url":"lib.js"},
-      {"name":"weather.img","url":"icon.js","evaluate":true}
+      {"name":"weather.img","url":"icon.js","evaluate":true},
+      {"name":"weather.settings.js","url":"settings.js"}
     ],
     "data": [
       {"name": "weather.json"}

apps/weather/lib.js

@@ -1,3 +1,21 @@
+let expiryTimeout = undefined;
+function updateExpiry(json) {
+  if (expiryTimeout) {
+    clearTimeout(expiryTimeout);
+    expiryTimeout = undefined;
+  }
+  if (json.weather && json.weather.time && json.expiry) {
+    let t = json.weather.time + json.expiry - Date.now();
+    expiryTimeout = setTimeout(() => {
+      expiryTimeout = undefined;
+      let json = require('Storage').readJSON('weather.json')||{};
+      delete json.weather;
+      require('Storage').write('weather.json', json);
+      exports.emit("expiry");
+    }, t);
+  }
+}
+
 exports = {
   save: weather => {
     let json = require('Storage').readJSON('weather.json')||{};
@@ -5,6 +23,7 @@ exports = {
     delete json.weather.t; // don't save the event type (if present)
     json.weather.time = Date.now();
     require('Storage').write('weather.json', json);
+    updateExpiry(json);
   },
   load: () => {
     let json = require('Storage').readJSON('weather.json')||{};
@@ -175,3 +194,5 @@ exports = {
     chooseIcon(cond)(x, y, r);
   },
 }
+
+updateExpiry(require('Storage').readJSON('weather.json')||{});

apps/weather/settings.js

@@ -0,0 +1,24 @@
+(function(back) {
+  const storage = require('Storage');
+  let settings = storage.readJSON('weather.json', 1) || {};
+  function save(key, value) {
+    settings[key] = value;
+    storage.write('weather.json', settings);
+  }
+  E.showMenu({
+    '': { 'title': 'Weather' },
+    'Expiry': {
+      value: "expiry" in settings ? settings["expiry"] : 2*3600000,
+      min: 0,
+      max : 24*3600000,
+      step: 15*60000,
+      format: x => {
+        if (x == 0) return "none";
+        if (x < 3600000) return Math.floor(x/60000) + "m";
+        if (x < 86400000) return Math.floor(x/36000)/100 + "h";
+      },
+      onchange: x => save('expiry', x),
+    },
+    '< Back': back,
+  });
+})

apps/weather/widget.js

@@ -44,6 +44,11 @@
     if (_GB) setTimeout(_GB, 0, event);
   };
 
+  require('weather').on("expiry", () => {
+    WIDGETS["weather"].width = 0;
+    Bangle.drawWidgets();
+  });
+
   WIDGETS["weather"] = {area: "tl", width: 20, draw: draw};
   if (!require('weather').load()) {
     WIDGETS["weather"].width = 0;