Introduction to Log Update

Log-update is a powerful npm package designed to provide real-time log updates in the terminal. This utility is particularly useful for rendering progress bars, status updates, and dynamic logs in command-line applications. In this comprehensive tutorial, we’ll explore various APIs offered by log-update and provide a sample application to demonstrate their usage.

Installation

npm install log-update

API Examples

Basic Usage

The basic usage of log-update allows you to update the terminal output persistently.

 const logUpdate = require('log-update');
logUpdate('Hello, World!'); 

Updating Log Message

You can update the log message continuously:

 const logUpdate = require('log-update');
const frames = ['-', '\\', '|', '/']; let i = 0;
setInterval(() => {
  const frame = frames[i = ++i % frames.length];
  logUpdate(`Loading ${frame}`);
}, 80); 

Clear Log

Clear the existing log messages from the terminal:

 const logUpdate = require('log-update');
logUpdate.clear(); 

Persist Log

Persist the current log message and start a new one:

 const logUpdate = require('log-update');
logUpdate('This will be logged permanently'); logUpdate.done();
logUpdate('New log message'); 

Comprehensive App Example

Let’s create a basic download progress bar that updates in real-time using log-update API:

 const logUpdate = require('log-update'); const chalk = require('chalk');
const frames = ['-', '\\', '|', '/']; let i = 0; let progress = 0;
const downloadInterval = setInterval(() => {
  const frame = frames[i = ++i % frames.length];
  progress += 2;

  logUpdate(`
  ${chalk.yellow('Downloading')} ${frame}
  ${chalk.green('Progress')} [${'='.repeat(progress / 2)}${' '.repeat(50 - progress / 2)}] ${progress}%
  `);

  if (progress >= 100) {
    clearInterval(downloadInterval);
    logUpdate(`
    ${chalk.green('Download Complete!')}
    `);
    logUpdate.done();
  }
}, 100); 

Conclusion

Log-update is a versatile library for creating interactive terminal applications. From basic log updates to advanced progress indicators, this library provides a robust set of features that can significantly enhance the user experience of command-line tools. Give it a try and see how it can improve your next CLI project.

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