Barmesan

Barmesan is a simple progress bar utility library.

Features

• [ ] ProgressBar.render()
  • [ ] Web
  • [x] Node
  • [ ] Deno
  • [ ] Bun
• [x] ProgressBar.toString()

Installation

npm i barmesan

or

bun i barmesan

Importing

Module

import { ProgressBar } from "barmesan";

CommonJS

const { ProgressBar } = require("barmesan");

Usage

"Direct" method

ProgressBar.progress

This method is the most direct and simple, hence the name.

// Create a progress bar.
const progressBar = new ProgressBar();

// Set the progress bar's value.
progressBar.progress = 0.42;

"Step" method

ProgressBar.start(callback)

This method allows for a step function to be called repeatedly until the progress bar is full.

// Pseudo download function.
function download(downloadSizeInBytes) {
  // Create a progress bar.
  const progressBar = new ProgressBar();

  // The total number of bytes downloaded.
  let downloadedByteCount = 0;

  // Receive the next set of bytes.
  function downloadMoreBytes(e) {
    // Add to the total number of downloaded bytes.
    downloadedByteCount += e.deltaTime;

    // Update the progress bar.
    progressBar.progress = downloadedByteCount / downloadSizeInBytes;
  }

  // Start the task.
  progressBar.start(downloadMoreBytes);
}

// Pretend to download a file.
download(1000);

"Interval" method

ProgressBar.interval(callback, delay)

This method allows for an interval callback to be defined, similar to setInterval(). The callback method will be called once every delay milliseconds. Once the progress bar is full, the interval callback is automatically cleared, similar to clearInterval().

Note: There is currently a bug with the interval method whereby the thread will not close even after the progress bar is full. For now, it is best to rely on the other methods in production code until this bug is resolved.

// Pseudo download function.
function download(downloadSizeInBytes) {
  // Create a progress bar.
  const progressBar = new ProgressBar();

  // The total number of bytes downloaded.
  let downloadedByteCount = 0;

  let interval;

  // Receive the next set of bytes.
  function downloadMoreBytes(e) {
    // Add to the total number of downloaded bytes.
    downloadedByteCount += 10;

    // Update the progress bar.
    progressBar.progress = downloadedByteCount / downloadSizeInBytes;
  }

  // Clear the interval upon filling.
  progressBar.on(
    "full",
    () => {
      progressBar.clearInterval(interval);

      // HACK: Workaround for issue #1.
      process.exit();
    }
  );

  // Start the task.
  interval = progressBar.interval(downloadMoreBytes, 10);
}

// Pretend to download a file.
download(1000);