yargonaut

What is yargonaut?

The yargonaut npm package is a utility that enhances the yargs command-line argument parser with additional features such as colorization and styling of output. It allows developers to create more visually appealing and user-friendly CLI applications.

What are yargonaut's main functionalities?

Colorization

This feature allows you to colorize the output of your CLI application. In this example, the output will be styled in blue.

const yargonaut = require('yargonaut').style('blue');
const yargs = require('yargs');

console.log(yargonaut.asYargs(yargs).argv);

Styling

This feature allows you to apply different styles to the output, such as making the text bold. In this example, the output will be bold.

const yargonaut = require('yargonaut').style('bold');
const yargs = require('yargs');

console.log(yargonaut.asYargs(yargs).argv);

Custom Themes

This feature allows you to create custom themes for your CLI application. In this example, the main text will be red, and the help text will be green.

const yargonaut = require('yargonaut').style('red').helpStyle('green');
const yargs = require('yargs');

yargs.usage('Usage: $0 <command> [options]')
  .command('hello', 'say hello', {}, (argv) => {
    console.log('Hello, world!');
  })
  .help()
  .argv;

Other packages similar to yargonaut

chalk

Chalk is a popular library for styling terminal strings. It provides a wide range of colors and styles, making it a versatile choice for enhancing CLI output. Unlike yargonaut, which is specifically designed to work with yargs, Chalk can be used independently or with any CLI tool.

cli-color

CLI-Color is another library for styling terminal output. It offers a comprehensive set of features for colorizing and styling text. Similar to Chalk, CLI-Color is not tied to any specific CLI argument parser, giving it broader applicability compared to yargonaut.

colors

Colors is a library that adds color and style to console output. It is simple to use and integrates well with various CLI tools. While it provides similar functionality to yargonaut, it does not have built-in integration with yargs.

README

yargonaut

Decorate yargs content with chalk styles and figlet fonts

yargonaut is the content decorator for yargs, allowing you to customize your yargs-based CLI output using chalk styles and/or figlet fonts ... easily!

Why? Because CLI apps with color and ASCII Art are more fun!

Could you customize yargs text, possibly using chalk or figlet, without yargonaut? Absolutely. But yargonaut makes it so easy! And yargonaut supports all locales that yargs and figlet support - out of the box.

Could terminal coloring or ASCII Art fonts be annoying in CLI apps? Well, sure. But used tastefully, it can add a degree of creative flair to make your CLI stand out. Use wisely!

Install

npm install --save yargonaut yargs

var yargonaut = require('yargonaut') // yargonaut first!
var yargs = require('yargs') // then yargs

yargonaut assumes you have yargs installed independently.

To automatically support all locales that yargs supports, make sure to require('yargonaut') in code before you require('yargs'). This is important! If you choose to ignore this, yargonaut will attempt workarounds as best it can, but any issues caused by incorrect ordering of require() statements will not be given priority. The ordering should be natural, since you'll need to configure yargonaut before yargs parses CLI args anyway.

Note that yargonaut does not wrap yargs and is not a replacement for yargs. It's built to work with yargs side-by-side, and it doesn't lock you in to a particular version of yargs, though internal string customization is only supported in yargs v3.16.1 and up.

If anything goes wrong, yargonaut attempts to fail gracefully and silently, so your CLI still works, just without the cool colors/fonts.

Examples

Use a single style and font for all top-level yargs strings:

require('yargonaut')
  .style('blue')
  .font('Small Slant') // that's it!

var argv = require('yargs')
  .command('add', 'Add item to cart')
  .command('rm', 'Remove item from cart')
  .option('p', {
    alias: 'product',
    describe: 'Product id(s)',
    demand: true
  })
  .option('s', {
    alias: 'size',
    describe: 'Desired product size',
    choices: ['s', 'm', 'l'],
    default: 'm'
  })
  .option('c', {
    alias: 'color',
    describe: 'Desired product color'
  })
  .example('$0 add -p 123 -s l -c green', 'Add large, green product with id 123')
  .wrap(null)
  .argv

$ node order.js
  _____                              __    _
 / ___/__  __ _  __ _  ___ ____  ___/ /__ (_)
/ /__/ _ \/  ' \/  ' \/ _ `/ _ \/ _  (_-<_
\___/\___/_/_/_/_/_/_/\_,_/_//_/\_,_/___(_)

  add  Add item to cart
  rm   Remove item from cart

  ____       __  _               _
 / __ \___  / /_(_)__  ___  ___ (_)
/ /_/ / _ \/ __/ / _ \/ _ \(_-<_
\____/ .__/\__/_/\___/_//_/___(_)
    /_/
  -p, --product  Product id(s)  [required]
  -s, --size     Desired product size  [choices: "s", "m", "l"] [default: "m"]
  -c, --color    Desired product color

   ____                     __        _
  / __/_ _____ ___ _  ___  / /__ ___ (_)
 / _/ \ \ / _ `/  ' \/ _ \/ / -_|_-<_
/___//_\_\\_,_/_/_/_/ .__/_/\__/___(_)
                   /_/
  order.js add -p 123 -s l -c green  Add large, green product with id 123

   __  ____         _                               _            __                                    __  _
  /  |/  (_)__ ___ (_)__  ___ _  _______ ___ ___ __(_)______ ___/ / ___ ________ ___ ____ _  ___ ___  / /_(_)
 / /|_/ / (_-<(_-</ / _ \/ _ `/ / __/ -_) _ `/ // / / __/ -_) _  / / _ `/ __/ _ `/ // /  ' \/ -_) _ \/ __/
/_/  /_/_/___/___/_/_//_/\_, / /_/  \__/\_, /\_,_/_/_/  \__/\_,_/  \_,_/_/  \_, /\_,_/_/_/_/\__/_//_/\__(_)  
                        /___/            /_/                               /___/
   p

Use one style and font for help content and another for error messages:

require('yargonaut')
  .help('3D-ASCII')
  .helpStyle('green')
  .errors('Calvin S')
  .errorsStyle('red')

var argv = require('yargs')
  .command('add', 'Add item to cart')
  .command('rm', 'Remove item from cart')
  .option('p', {
    alias: 'product',
    describe: 'Product id(s)',
    demand: true
  })
  .option('s', {
    alias: 'size',
    describe: 'Desired product size',
    choices: ['s', 'm', 'l'],
    default: 'm'
  })
  .option('c', {
    alias: 'color',
    describe: 'Desired product color'
  })
  .example('$0 add -p 123 -s l -c green', 'Add large, green product with id 123')
  .wrap(null)
  .argv

$ node order.js
 ________  ________  _____ ______   _____ ______   ________  ________   ________  ________
|\   ____\|\   __  \|\   _ \  _   \|\   _ \  _   \|\   __  \|\   ___  \|\   ___ \|\   ____\  ___
\ \  \___|\ \  \|\  \ \  \\\__\ \  \ \  \\\__\ \  \ \  \|\  \ \  \\ \  \ \  \_|\ \ \  \___|_|\__\
 \ \  \    \ \  \\\  \ \  \\|__| \  \ \  \\|__| \  \ \   __  \ \  \\ \  \ \  \ \\ \ \_____  \|__|
  \ \  \____\ \  \\\  \ \  \    \ \  \ \  \    \ \  \ \  \ \  \ \  \\ \  \ \  \_\\ \|____|\  \  ___
   \ \_______\ \_______\ \__\    \ \__\ \__\    \ \__\ \__\ \__\ \__\\ \__\ \_______\____\_\  \|\__\
    \|_______|\|_______|\|__|     \|__|\|__|     \|__|\|__|\|__|\|__| \|__|\|_______|\_________\|__|
                                                                                    \|_________|


  add  Add item to cart
  rm   Remove item from cart

 ________  ________  _________  ___  ________  ________   ________
|\   __  \|\   __  \|\___   ___\\  \|\   __  \|\   ___  \|\   ____\  ___
\ \  \|\  \ \  \|\  \|___ \  \_\ \  \ \  \|\  \ \  \\ \  \ \  \___|_|\__\
 \ \  \\\  \ \   ____\   \ \  \ \ \  \ \  \\\  \ \  \\ \  \ \_____  \|__|
  \ \  \\\  \ \  \___|    \ \  \ \ \  \ \  \\\  \ \  \\ \  \|____|\  \  ___
   \ \_______\ \__\        \ \__\ \ \__\ \_______\ \__\\ \__\____\_\  \|\__\
    \|_______|\|__|         \|__|  \|__|\|_______|\|__| \|__|\_________\|__|
                                                            \|_________|


  -p, --product  Product id(s)  [required]
  -s, --size     Desired product size  [choices: "s", "m", "l"] [default: "m"]
  -c, --color    Desired product color

 _______      ___    ___ ________  _____ ______   ________  ___       _______   ________
|\  ___ \    |\  \  /  /|\   __  \|\   _ \  _   \|\   __  \|\  \     |\  ___ \ |\   ____\  ___
\ \   __/|   \ \  \/  / | \  \|\  \ \  \\\__\ \  \ \  \|\  \ \  \    \ \   __/|\ \  \___|_|\__\
 \ \  \_|/__  \ \    / / \ \   __  \ \  \\|__| \  \ \   ____\ \  \    \ \  \_|/_\ \_____  \|__|
  \ \  \_|\ \  /     \/   \ \  \ \  \ \  \    \ \  \ \  \___|\ \  \____\ \  \_|\ \|____|\  \  ___
   \ \_______\/  /\   \    \ \__\ \__\ \__\    \ \__\ \__\    \ \_______\ \_______\____\_\  \|\__\
    \|_______/__/ /\ __\    \|__|\|__|\|__|     \|__|\|__|     \|_______|\|_______|\_________\|__|
             |__|/ \|__|                                                          \|_________|


  order.js add -p 123 -s l -c green  Add large, green product with id 123

╔╦╗┬┌─┐┌─┐┬┌┐┌┌─┐  ┬─┐┌─┐┌─┐ ┬ ┬┬┬─┐┌─┐┌┬┐  ┌─┐┬─┐┌─┐┬ ┬┌┬┐┌─┐┌┐┌┌┬┐
║║║│└─┐└─┐│││││ ┬  ├┬┘├┤ │─┼┐│ ││├┬┘├┤  ││  ├─┤├┬┘│ ┬│ ││││├┤ │││ │
╩ ╩┴└─┘└─┘┴┘└┘└─┘  ┴└─└─┘└─┘└└─┘┴┴└─└─┘─┴┘  ┴ ┴┴└─└─┘└─┘┴ ┴└─┘┘└┘ ┴
   p

Customize only specific yargs strings:

require('yargonaut')
  .font('DOS Rebel', 'Invalid values:')
  .style('yellow', 'Invalid values:')

var argv = require('yargs')
  .option('s', {
    alias: 'size',
    describe: 'Desired product size',
    choices: ['s', 'm', 'l'],
    demand: true
  })
  .showHelpOnFail(false)
  .argv

$ node order.js -s xl
 █████                                  ████   ███      █████                          ████
░░███                                  ░░███  ░░░      ░░███                          ░░███
 ░███  ████████   █████ █████  ██████   ░███  ████   ███████     █████ █████  ██████   ░███  █████ ████  ██████   █████  ██
 ░███ ░░███░░███ ░░███ ░░███  ░░░░░███  ░███ ░░███  ███░░███    ░░███ ░░███  ░░░░░███  ░███ ░░███ ░███  ███░░███ ███░░  ░░
 ░███  ░███ ░███  ░███  ░███   ███████  ░███  ░███ ░███ ░███     ░███  ░███   ███████  ░███  ░███ ░███ ░███████ ░░█████
 ░███  ░███ ░███  ░░███ ███   ███░░███  ░███  ░███ ░███ ░███     ░░███ ███   ███░░███  ░███  ░███ ░███ ░███░░░   ░░░░███
 █████ ████ █████  ░░█████   ░░████████ █████ █████░░████████     ░░█████   ░░████████ █████ ░░████████░░██████  ██████  ██
░░░░░ ░░░░ ░░░░░    ░░░░░     ░░░░░░░░ ░░░░░ ░░░░░  ░░░░░░░░       ░░░░░     ░░░░░░░░ ░░░░░   ░░░░░░░░  ░░░░░░  ░░░░░░  ░░



  Argument: s, Given: "xl", Choices: "s", "m", "l"

Change default rendering strategy for a specific string:

require('yargonaut')
  .errors('ANSI Shadow')
  .transformWholeString('Unknown argument: %s')

var argv = require('yargs')
  .showHelpOnFail(false)
  .strict()
  .argv

$ node order.js -a -b
██╗   ██╗███╗   ██╗██╗  ██╗███╗   ██╗ ██████╗ ██╗    ██╗███╗   ██╗     █████╗ ██████╗  ██████╗ ██╗   ██╗███╗   ███╗███████╗███╗   ██╗████████╗███████╗        █████╗        ██████╗
██║   ██║████╗  ██║██║ ██╔╝████╗  ██║██╔═══██╗██║    ██║████╗  ██║    ██╔══██╗██╔══██╗██╔════╝ ██║   ██║████╗ ████║██╔════╝████╗  ██║╚══██╔══╝██╔════╝██╗    ██╔══██╗       ██╔══██╗
██║   ██║██╔██╗ ██║█████╔╝ ██╔██╗ ██║██║   ██║██║ █╗ ██║██╔██╗ ██║    ███████║██████╔╝██║  ███╗██║   ██║██╔████╔██║█████╗  ██╔██╗ ██║   ██║   ███████╗╚═╝    ███████║       ██████╔╝
██║   ██║██║╚██╗██║██╔═██╗ ██║╚██╗██║██║   ██║██║███╗██║██║╚██╗██║    ██╔══██║██╔══██╗██║   ██║██║   ██║██║╚██╔╝██║██╔══╝  ██║╚██╗██║   ██║   ╚════██║██╗    ██╔══██║       ██╔══██╗
╚██████╔╝██║ ╚████║██║  ██╗██║ ╚████║╚██████╔╝╚███╔███╔╝██║ ╚████║    ██║  ██║██║  ██║╚██████╔╝╚██████╔╝██║ ╚═╝ ██║███████╗██║ ╚████║   ██║   ███████║╚═╝    ██║  ██║▄█╗    ██████╔╝
 ╚═════╝ ╚═╝  ╚═══╝╚═╝  ╚═╝╚═╝  ╚═══╝ ╚═════╝  ╚══╝╚══╝ ╚═╝  ╚═══╝    ╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝  ╚═════╝ ╚═╝     ╚═╝╚══════╝╚═╝  ╚═══╝   ╚═╝   ╚══════╝       ╚═╝  ╚═╝╚═╝    ╚═════╝

API

Chainable config methods

errors(font)

Render error messages using the specified figlet font.

• Returns: yargonaut singleton
• font: string, name of figlet font

errorsStyle(style)

Apply the given chalk style to error messages, e.g. errorsStyle('red.bold').

• Returns: yargonaut singleton
• style: string, the dot-delimited chalk style (color/modifier) to use

font(font, [key])

Render yargs strings using the specified figlet font. Optionally specify which yargs string(s) the font should apply to.

• Returns: yargonaut singleton
• font: string, name of figlet font
• key: string or array of strings, optional key(s) the font should apply to

help(font)

Render help content strings using the specified figlet font.

• Returns: yargonaut singleton
• font: string, name of figlet font

helpStyle(style)

Apply the given chalk style to help content, e.g. helpStyle('green.underline').

• Returns: yargonaut singleton
• style: string, the dot-delimited chalk style (color/modifier) to use

ocd(fn)

For obsessive control over string transformations, provide a function that yargonaut will call for every yargs string (every y18n lookup).

• Returns: yargonaut singleton
• fn: function that returns a string and accepts the following:
  • key: string, the yargs key being rendered
  • origString: string, the original string resolved by y18n
  • newString: string, the new string as rendered by yargonaut/figlet
  • figlet: figlet, the figlet instance
  • font: string, the configured figlet font for the key

style(style, [key])

Apply the given chalk style to all yargs strings, e.g. style('blue'). Optionally specify which yargs string(s) the style should apply to.

• Returns: yargonaut singleton
• style: string, the dot-delimited chalk style (color/modifier) to use
• key: string or array of strings, optional key(s) the style should apply to

transformUpToFirstColon(key)

Change the default splitting/rendering strategy for specific yargs strings.

• Returns: yargonaut singleton
• key: string or array of strings, optional key(s) the render strategy should apply to

transformWholeString(key)

Change the default splitting/rendering strategy for specific yargs strings.

• Returns: yargonaut singleton
• key: string or array of strings, optional key(s) the render strategy should apply to

Getter methods

getAllKeys()

Get a list of all known yargs strings (help content + error messages) subject to y18n lookup and yargonaut rendering.

• Returns: array of strings, representing all configured yargs strings

getErrorKeys()

Get a list of known error messages subject to y18n lookup and yargonaut rendering.

• Returns: array of strings, representing configured error msg yargs strings

getHelpKeys()

Get a list of known help content strings subject to y18n lookup and yargonaut rendering.

• Returns: array of strings, representing configured help content yargs strings

Convenience methods for playing with stuff

asFont(text, font, [throwErr])

Render any text as the given figlet font and return as string.

• Returns: string, the text rendered as font
• text: string, the text to render
• font: string, the figlet font to use for rendering
• throwErr: boolean, optional flag to throw any error that might occur, defaults to false

chalk()

Get access to the chalk instance used by yargonaut. In case you want to color your own strings without having to require('chalk') yourself.

• Returns: chalk, the chalk instance

figlet()

Get access to the figlet instance used by yargonaut. I mean, why not?

• Returns: figlet, the figlet instance

listFonts()

Get a list of all supported figlet fonts. Maybe you want to mix it up with a random font?

• Returns: array of strings, representing supported font names

printFont(font, [text], [throwErr])

Test print one figlet font to stdout using console.log().

• Returns: undefined
• font: string, the figlet font to test print
• text: string, optional text to print as font, defaults to font name
• throwErr: boolean, optional flag to throw any error that might occur, defaults to false

printFonts([text], [throwErr])

Test print every supported figlet font to stdout using console.log().

• Returns: undefined
• text: string, optional text to print as font, defaults to font name
• throwErr: boolean, optional flag to throw any error that might occur, defaults to false

License

Apache-2.0 © Andrew Goode