argparse

Argument Parsing

This feature allows the program to parse command-line arguments. The code sample demonstrates how to create a new ArgumentParser, add arguments with options like verbosity, and then parse the arguments provided by the user.

const { ArgumentParser } = require('argparse');
const parser = new ArgumentParser({
  description: 'Argparse example'
});

parser.add_argument('-v', '--verbose', {
  help: 'increase output verbosity',
  action: 'store_true'
});
parser.add_argument('echo', {
  help: 'echo the string you use here'
});

const args = parser.parse_args();
console.log(args);

Sub-commands

This feature allows the program to define sub-commands, which are commands that the program can perform. The code sample shows how to create sub-commands for starting and stopping a service, with additional options for each sub-command.

const { ArgumentParser } = require('argparse');
const parser = new ArgumentParser({
  description: 'Sub-command example'
});

const subparsers = parser.add_subparsers({
  title: 'subcommands',
  dest: 'subcommand_name'
});

const start = subparsers.add_parser('start', { aliases: ['run'] });
start.add_argument('-s', '--service', { help: 'Start the service' });

const stop = subparsers.add_parser('stop');
stop.add_argument('-f', '--force', { help: 'Force stop', action: 'store_true' });

const args = parser.parse_args();
console.log(args);

Argument Types and Choices

This feature allows the program to specify the type of an argument and restrict it to a set of choices. The code sample demonstrates how to define an integer argument and a string argument that must be one of the specified choices.

const { ArgumentParser } = require('argparse');
const parser = new ArgumentParser({
  description: 'Argument types example'
});

parser.add_argument('square', {
  help: 'display a square of a given number',
  type: 'int'
});
parser.add_argument('--cuisine', {
  help: 'choose the type of cuisine',
  choices: ['Italian', 'Mexican', 'Japanese'],
  required: true
});

const args = parser.parse_args();
console.log(args);