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204 lines
5.8 KiB
204 lines
5.8 KiB
<p align="center"> |
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<img width="250" src="https://raw.githubusercontent.com/yargs/yargs/main/yargs-logo.png"> |
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</p> |
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<h1 align="center"> Yargs </h1> |
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<p align="center"> |
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<b >Yargs be a node.js library fer hearties tryin' ter parse optstrings</b> |
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</p> |
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<br> |
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![ci](https://github.com/yargs/yargs/workflows/ci/badge.svg) |
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[![NPM version][npm-image]][npm-url] |
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[![js-standard-style][standard-image]][standard-url] |
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[![Coverage][coverage-image]][coverage-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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## Description |
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Yargs helps you build interactive command line tools, by parsing arguments and generating an elegant user interface. |
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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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``` |
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mocha [spec..] |
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Run tests with Mocha |
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Commands |
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mocha inspect [spec..] Run tests with Mocha [default] |
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mocha init <path> create a client-side Mocha setup at <path> |
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Rules & Behavior |
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--allow-uncaught Allow uncaught errors to propagate [boolean] |
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--async-only, -A Require all tests to use a callback (async) or |
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return a Promise [boolean] |
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``` |
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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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Stable version: |
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```bash |
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npm i yargs |
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``` |
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Bleeding edge version with the most recent features: |
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```bash |
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npm i yargs@next |
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``` |
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## Usage |
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### Simple Example |
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```javascript |
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#!/usr/bin/env node |
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const yargs = require('yargs/yargs') |
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const { hideBin } = require('yargs/helpers') |
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const argv = yargs(hideBin(process.argv)).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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> Note: `hideBin` is a shorthand for [`process.argv.slice(2)`](https://nodejs.org/en/knowledge/command-line/how-to-parse-command-line-arguments/). It has the benefit that it takes into account variations in some environments, e.g., [Electron](https://github.com/electron/electron/issues/4690). |
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### Complex Example |
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```javascript |
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#!/usr/bin/env node |
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const yargs = require('yargs/yargs') |
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const { hideBin } = require('yargs/helpers') |
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yargs(hideBin(process.argv)) |
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.command('serve [port]', 'start the server', (yargs) => { |
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return 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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type: 'boolean', |
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description: 'Run with verbose logging' |
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}) |
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.parse() |
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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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## Supported Platforms |
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### TypeScript |
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yargs has type definitions at [@types/yargs][type-definitions]. |
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``` |
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npm i @types/yargs --save-dev |
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``` |
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See usage examples in [docs](/docs/typescript.md). |
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### Deno |
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As of `v16`, `yargs` supports [Deno](https://github.com/denoland/deno): |
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```typescript |
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import yargs from 'https://deno.land/x/yargs/deno.ts' |
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import { Arguments } from 'https://deno.land/x/yargs/deno-types.ts' |
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yargs(Deno.args) |
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.command('download <files...>', 'download a list of files', (yargs: any) => { |
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return yargs.positional('files', { |
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describe: 'a list of files to do something with' |
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}) |
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}, (argv: Arguments) => { |
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console.info(argv) |
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}) |
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.strictCommands() |
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.demandCommand(1) |
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.parse() |
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``` |
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### ESM |
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As of `v16`,`yargs` supports ESM imports: |
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```js |
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import yargs from 'yargs' |
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import { hideBin } from 'yargs/helpers' |
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yargs(hideBin(process.argv)) |
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.command('curl <url>', 'fetch the contents of the URL', () => {}, (argv) => { |
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console.info(argv) |
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}) |
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.demandCommand(1) |
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.parse() |
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``` |
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### Usage in Browser |
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See examples of using yargs in the browser in [docs](/docs/browser.md). |
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## Community |
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Having problems? want to contribute? join our [community slack](http://devtoolscommunity.herokuapp.com). |
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## Documentation |
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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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* [Quotes](/docs/tricks.md#quotes) |
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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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* [Bundling yargs](/docs/bundling.md) |
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* [Contributing](/contributing.md) |
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## Supported Node.js Versions |
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Libraries in this ecosystem make a best effort to track |
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[Node.js' release schedule](https://nodejs.org/en/about/releases/). Here's [a |
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post on why we think this is important](https://medium.com/the-node-js-collection/maintainers-should-consider-following-node-js-release-schedule-ab08ed4de71a). |
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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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[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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[type-definitions]: https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types/yargs |
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[coverage-image]: https://img.shields.io/nycrc/yargs/yargs |
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[coverage-url]: https://github.com/yargs/yargs/blob/main/.nycrc
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