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# Yargs
[![Build Status][travis-image]][travis-url]
[![Coverage Status][coveralls-image]][coveralls-url]
[![NPM version][npm-image]][npm-url]
[![Windows Tests][windows-image]][windows-url]
[![js-standard-style][standard-image]][standard-url]
[![Conventional Commits][conventional-commits-image]][conventional-commits-url]
[![Gitter][gitter-image]][gitter-url]
> Yargs be a node.js library fer hearties tryin' ter parse optstrings.
<img width="250" src="/yargs-logo.png">
Yargs helps you build interactive command line tools, by parsing arguments and generating an elegant user interface. It gives you:
* commands and (grouped) options (`my-program.js serve --port=5000`).
* a dynamically generated help menu based on your arguments.
> <img width="400" src="/screen.png">
* bash-completion shortcuts for commands and options.
* and [tons more](/docs/api.md).
## Installation
```bash
npm i yargs --save
```
## Simple Example
````javascript
#!/usr/bin/env node
const argv = require('yargs').argv
if (argv.ships > 3 && argv.distance < 53.5) {
console.log('Plunder more riffiwobbles!')
} else {
console.log('Retreat from the xupptumblers!')
}
````
```bash
$ ./plunder.js --ships=4 --distance=22
Plunder more riffiwobbles!
$ ./plunder.js --ships 12 --distance 98.7
Retreat from the xupptumblers!
```
## Complex Example
```js
#!/usr/bin/env node
const yargs = require('yargs') // eslint-disable-line
.command('serve', 'start the server', (yargs) => {
yargs.option('port', {
describe: 'port to bind on',
default: 5000
})
}, (argv) => {
if (argv.verbose) console.info(`start server on :${argv.port}`)
serve(argv.port)
})
.option('verbose', {
alias: 'v',
default: false
})
.help()
.argv
```
## Table of Contents
* [Yargs' API](/docs/api.md)
* [Examples](/docs/examples.md)
* [Parsing Tricks](/docs/tricks.md)
* [Stop the Parser](/docs/tricks.md#stop)
* [Negating Boolean Arguments](/docs/tricks.md#negate)
* [Numbers](/docs/tricks.md#numbers)
* [Arrays](/docs/tricks.md#arrays)
* [Objects](/docs/tricks.md#objects)
* [Advanced Topics](/docs/advanced.md)
* [Composing Your App Using Commands](/docs/advanced.md#commands)
* [Building Configurable CLI Apps](/docs/advanced.md#configuration)
* [Customizing Yargs' Parser](/docs/advanced.md#customizing)
* [Contributing](/contributing.md)
[travis-url]: https://travis-ci.org/yargs/yargs
[travis-image]: https://img.shields.io/travis/yargs/yargs/master.svg
[coveralls-url]: https://coveralls.io/github/yargs/yargs
[coveralls-image]: https://img.shields.io/coveralls/yargs/yargs.svg
[npm-url]: https://www.npmjs.com/package/yargs
[npm-image]: https://img.shields.io/npm/v/yargs.svg
[windows-url]: https://ci.appveyor.com/project/bcoe/yargs-ljwvf
[windows-image]: https://img.shields.io/appveyor/ci/bcoe/yargs-ljwvf/master.svg?label=Windows%20Tests
[standard-image]: https://img.shields.io/badge/code%20style-standard-brightgreen.svg
[standard-url]: http://standardjs.com/
[conventional-commits-image]: https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg
[conventional-commits-url]: https://conventionalcommits.org/
[gitter-image]: https://img.shields.io/gitter/room/nwjs/nw.js.svg?maxAge=2592000
[gitter-url]: https://gitter.im/yargs/Lobby?utm_source=share-link&utm_medium=link&utm_campaign=share-link
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