util.ts

export function pad(s: string, l: number): string {
  return (s + " ".repeat(l)).slice(0, l);
}

export function oneSigFig(n: number): string {
  return String(Math.floor(10 * n) / 10);
}

export function progress(done: number, outof: number, extraInfo: string) {
  const width = 20;
  const pct = done / outof;
  const FILLED_CHAR = "█";
  const EMPTY_CHAR = " ";
  const SUBPIXEL_CHARS = "▏▎▍▌▋▊▉█";
  let progressBar = "";
  progressBar += "▐"; // start

  const fillTill = Math.floor(pct * width);
  let filled = 0;

  // filled part
  progressBar += FILLED_CHAR.repeat(fillTill);
  filled += fillTill;

  // subpixel part
  if (fillTill != width) {
    const subpixelFillLevel = pct * width - Math.floor(pct * width);
    const subpixelIndex = Math.floor(subpixelFillLevel * SUBPIXEL_CHARS.length);
    progressBar += SUBPIXEL_CHARS[subpixelIndex];

    filled += 1;
  }

  // unfilled part
  progressBar += EMPTY_CHAR.repeat(width - filled);

  progressBar += "▌ "; // end
  process.stdout.write(progressBar + extraInfo + "\r");
}