printprogress.js

const readline = require("readline");

let lastUpdate = 0;

// Updates the single line progress indicator on screen

function printprogress(start, tilesComplete, totalTiles) {
  const now = new Date();
  if (now - lastUpdate < 1000) return; // Update frequency < once per second
  const elapsedMs = new Date() - start;
  const progress = (100 * tilesComplete) / totalTiles;
  const remainMs = (elapsedMs / tilesComplete) * (totalTiles - tilesComplete);
  const tilespersec = (tilesComplete / elapsedMs) * 1000;
  const est = new Date(Date.now() + remainMs);
  readline.clearLine(process.stdout, 0);
  readline.cursorTo(process.stdout, 0, null);
  process.stdout.write(
    `${tilesComplete}/${totalTiles} (${progress.toFixed(
      2
    )}%)\t${tilespersec.toFixed(
      2
    )} tiles/sec\t Completion est: ${est.toLocaleTimeString()}`
  );
  lastUpdate = now;
}

module.exports = printprogress;