BangleApps/apps/chimer/widget.js

(function() {
  // 0: off, 1: buzz, 2: beep, 3: both
  var readSettings = () => {
    var settings = require("Storage").readJSON(FILE, 1) || {
      type: 1,
      freq: 0,
      repeat: 1,
    };
    return settings;
  };

  var settings = readSettings()

function sleep(milliseconds) {
    const date = Date.now();
    let currentDate = null;
    do {
      currentDate = Date.now();
    } while (currentDate - date < milliseconds);
  }

  function chime() {
    for(let i = 0; i < settings.repeat; i++){
    if (settings.type == 1){
      Bangle.buzz(100);
      sleep(100);
    } else if(settings.type == 2){
      Bangle.beep();
      sleep(100);
    } else {
      return;
    }
  }
  }

  //let lastHour = (new Date()).getHours(); // don't chime when (re)loaded at a whole hour h!==lastHour
  function check() {
    const now = new Date(),
      h = now.getHours(), m = now.getMinutes(),
      s = now.getSeconds(), ms = now.getMilliseconds();
    if (settings.freq == 1){
    if (m===0 || m===30) chime();
    lastHour = h;
    // check again in 30 minutes
    const mLeft = 30, sLeft = (mLeft*60)-s, msLeft = (sLeft*1000)-ms;
    setTimeout(check, msLeft);

  }else if (settings.freq == 2){
    if (m===0 || m===15 || m===30 || m===45) chime();
    lastHour = h;
    // check again in 15 minutes
    const mLeft = 15, sLeft = (mLeft*60)-s, msLeft = (sLeft*1000)-ms;
    setTimeout(check, msLeft);

  }else{
    if (m===0) chime();
    lastHour = h;
    // check again in 60 minutes
    const mLeft = 60-m, sLeft = (mLeft*60)-s, msLeft = (sLeft*1000)-ms;
    setTimeout(check, msLeft);

  }



  }

  check();
})
();