BangleApps/apps/boot/bootloader.js

// This runs after a 'fresh' boot
var settings;
try {
  settings = require("Storage").readJSON('@setting');
} catch (e) {
  settings = {}
}
// load clock if specified
var clockApp = settings.clock;
if (clockApp) clockApp = require("Storage").read(clockApp)
if (!clockApp) {
  var clockApps = require("Storage").list().filter(a=>a[0]=='+').map(app=>{
    try { return require("Storage").readJSON(app); }
    catch (e) {}
  }).filter(app=>app.type=="clock").sort((a, b) => a.sortorder - b.sortorder);
  if (clockApps && clockApps.length > 0)
    clockApp = require("Storage").read(clockApps[0].src);
  delete clockApps;
}
if (clockApp) eval(clockApp);
else E.showMessage("No Clock Found");
delete clockApp;