Introduction to hasbin

Hasbin is a utility tool designed to simplify the process of checking the availability of commands in Unix-like operating systems. It helps in ensuring that your scripts have all the necessary dependencies installed before execution. With a straightforward API, hasbin can significantly enhance your scripting experience.

Basic Usage

To get started with hasbin, you need to make sure it is installed on your system. The installation can be done via npm:

  npm install -g hasbin

API Methods

hasbin.sync(cmd)

Checks for the availability of a command synchronously.

  const hasbin = require('hasbin');

  if (hasbin.sync('node')) {
      console.log('Node.js is installed!');
  } else {
      console.log('Node.js is not installed.');
  }

hasbin.async(cmd, callback)

Checks for the availability of a command asynchronously.

  const hasbin = require('hasbin');

  hasbin.async('git', function(exists) {
      if (exists) {
          console.log('Git is installed!');
      } else {
          console.log('Git is not installed.');
      }
  });

hasbin.all(commands, callback)

Checks for the availability of multiple commands. Returns true if all commands are available.

  const hasbin = require('hasbin');

  hasbin.all(['node', 'npm'], function(exist) {
      if (exist) {
          console.log('Both Node.js and npm are installed.');
      } else {
          console.log('One or both of Node.js and npm are not installed.');
      }
  });

hasbin.any(commands, callback)

Checks for the availability of multiple commands. Returns true if any command is available.

  const hasbin = require('hasbin');

  hasbin.any(['git', 'svn'], function(exist) {
      if (exist) {
          console.log('Either Git or SVN is installed.');
      } else {
          console.log('Neither Git nor SVN is installed.');
      }
  });

Example Application Using hasbin

Here’s an example of a Node.js script that uses hasbin to ensure necessary command dependencies before running a script:

  const hasbin = require('hasbin');

  hasbin.all(['node', 'npm', 'git'], function(exist) {
      if (exist) {
          console.log('All necessary commands are available. Proceeding with the script...');
          // Your script logic here
      } else {
          console.log('One or more necessary commands are missing. Please install them and try again.');
      }
  });

This script verifies that Node.js, npm, and Git are installed. If any of these commands are missing, it prompts the user to install them.

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