113 lines
3.6 KiB
Markdown
113 lines
3.6 KiB
Markdown
# Yargs
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_Yargs is developed on evenings and weekends by
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volunteers. Why not grab them dinner or a drink?_
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[](https://gratipay.com/yargs/)
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[![Build Status][travis-image]][travis-url]
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[![Coverage Status][coveralls-image]][coveralls-url]
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[![NPM version][npm-image]][npm-url]
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[![Windows Tests][windows-image]][windows-url]
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[![js-standard-style][standard-image]][standard-url]
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[![Conventional Commits][conventional-commits-image]][conventional-commits-url]
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[![Slack][slack-image]][slack-url]
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_Having problems? want to contribute? join our [community slack](http://devtoolscommunity.herokuapp.com)_.
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> Yargs be a node.js library fer hearties tryin' ter parse optstrings.
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<img width="250" src="/yargs-logo.png">
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Yargs helps you build interactive command line tools, by parsing arguments and generating an elegant user interface. It gives you:
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* commands and (grouped) options (`my-program.js serve --port=5000`).
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* a dynamically generated help menu based on your arguments.
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> <img width="400" src="/screen.png">
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* bash-completion shortcuts for commands and options.
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* and [tons more](/docs/api.md).
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## Installation
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```bash
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npm i yargs --save
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```
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## Simple Example
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````javascript
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#!/usr/bin/env node
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const argv = require('yargs').argv
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if (argv.ships > 3 && argv.distance < 53.5) {
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console.log('Plunder more riffiwobbles!')
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} else {
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console.log('Retreat from the xupptumblers!')
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}
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````
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```bash
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$ ./plunder.js --ships=4 --distance=22
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Plunder more riffiwobbles!
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$ ./plunder.js --ships 12 --distance 98.7
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Retreat from the xupptumblers!
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```
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## Complex Example
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```js
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#!/usr/bin/env node
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require('yargs') // eslint-disable-line
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.command('serve [port]', 'start the server', (yargs) => {
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yargs
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.positional('port', {
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describe: 'port to bind on',
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default: 5000
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})
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}, (argv) => {
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if (argv.verbose) console.info(`start server on :${argv.port}`)
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serve(argv.port)
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})
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.option('verbose', {
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alias: 'v',
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default: false
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})
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.argv
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```
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Run the example above with `--help` to see the help for the application.
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## Table of Contents
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* [Yargs' API](/docs/api.md)
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* [Examples](/docs/examples.md)
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* [Parsing Tricks](/docs/tricks.md)
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* [Stop the Parser](/docs/tricks.md#stop)
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* [Negating Boolean Arguments](/docs/tricks.md#negate)
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* [Numbers](/docs/tricks.md#numbers)
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* [Arrays](/docs/tricks.md#arrays)
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* [Objects](/docs/tricks.md#objects)
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* [Advanced Topics](/docs/advanced.md)
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* [Composing Your App Using Commands](/docs/advanced.md#commands)
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* [Building Configurable CLI Apps](/docs/advanced.md#configuration)
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* [Customizing Yargs' Parser](/docs/advanced.md#customizing)
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* [Contributing](/contributing.md)
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[travis-url]: https://travis-ci.org/yargs/yargs
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[travis-image]: https://img.shields.io/travis/yargs/yargs/master.svg
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[coveralls-url]: https://coveralls.io/github/yargs/yargs
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[coveralls-image]: https://img.shields.io/coveralls/yargs/yargs.svg
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[npm-url]: https://www.npmjs.com/package/yargs
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[npm-image]: https://img.shields.io/npm/v/yargs.svg
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[windows-url]: https://ci.appveyor.com/project/bcoe/yargs-ljwvf
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[windows-image]: https://img.shields.io/appveyor/ci/bcoe/yargs-ljwvf/master.svg?label=Windows%20Tests
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[standard-image]: https://img.shields.io/badge/code%20style-standard-brightgreen.svg
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[standard-url]: http://standardjs.com/
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[conventional-commits-image]: https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg
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[conventional-commits-url]: https://conventionalcommits.org/
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[slack-image]: http://devtoolscommunity.herokuapp.com/badge.svg
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[slack-url]: http://devtoolscommunity.herokuapp.com
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