Add Random Clock Loader widget

apps.json

@@ -1720,5 +1720,17 @@
     "data": [
       {"name":"gallifr.json"}
     ]
+  },
+  { "id": "rndmclk",
+    "name": "Random Clock Loader",
+    "icon": "rndmclk.png",
+    "version":"0.01",
+    "description": "Load a different clock whenever the LCD is switched on.",
+    "readme": "README.md",
+    "tags": "widget,clock",
+    "type":"widget",
+    "storage": [
+      {"name":"rndmclk.wid.js","url":"widget.js"}
+    ]
   }
 ]

apps/rndmclk/ChangeLog

@@ -0,0 +1 @@
+0.01: New widget

apps/rndmclk/README.md

@@ -0,0 +1,6 @@
+# Summary
+
+Random Clock is a widget that will randomly show one of the installed watch faces each time the LCD is turned on.
+
+## Disclaimer
+This is an early version and will load a clock each time the LCD is turned on no matter what app was running before the screen went to standby. Also the next watch face is only loaded after the last one is shown for a few tens of seconds.

apps/rndmclk/widget.js

@@ -0,0 +1,29 @@
+(() => {
+
+  /**
+   * Random value between zero (inclusive) and max (exclusive)
+   * @param {int} max 
+   */
+  function getRandomInt(max) {
+    return Math.floor(Math.random() * Math.floor(max));
+  }
+
+  function loadRandomClock() {
+    // Find available clock apps (same way as in the bootloader)
+    var clockApps = require("Storage").list(/\.info$/).map(app => require("Storage").readJSON(app, 1) || {}).filter(app => app.type == "clock").sort((a, b) => a.sortorder - b.sortorder);
+
+    if (clockApps && clockApps.length > 0) {
+      var clockIndex = getRandomInt(clockApps.length);
+
+      load(clockApps[clockIndex].src);
+    }
+  }
+
+  Bangle.on('lcdPower', (on) => {
+    if (on) {
+      // TODO: Only run if the current app is a clock as well
+      loadRandomClock();
+    }
+  });
+
+})();