173 lines
4.7 KiB
Markdown
173 lines
4.7 KiB
Markdown
<div align="center">
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<img src="shots/logo.png" alt="kleur" height="120" />
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</div>
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<div align="center">
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<a href="https://npmjs.org/package/kleur">
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<img src="https://badgen.now.sh/npm/v/kleur" alt="version" />
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</a>
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<a href="https://travis-ci.org/lukeed/kleur">
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<img src="https://badgen.now.sh/travis/lukeed/kleur" alt="travis" />
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</a>
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<a href="https://npmjs.org/package/kleur">
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<img src="https://badgen.now.sh/npm/dm/kleur" alt="downloads" />
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</a>
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<a href="https://packagephobia.now.sh/result?p=kleur">
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<img src="https://packagephobia.now.sh/badge?p=kleur" alt="install size" />
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</a>
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</div>
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<div align="center">The fastest Node.js library for formatting terminal text with ANSI colors~!</div>
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## Features
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* No dependencies
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* Super [lightweight](#load-time) & [performant](#performance)
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* Supports [nested](#nested-methods) & [chained](#chained-methods) colors
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* No `String.prototype` modifications
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* Conditional [color support](#conditional-support)
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* Familiar [API](#api)
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---
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As of `v3.0` the Chalk-style syntax (magical getter) is no longer used.<br>If you need or require that syntax, consider using [`ansi-colors`](https://github.com/doowb/ansi-colors), which maintains `chalk` parity.
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---
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## Install
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```
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$ npm install --save kleur
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```
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## Usage
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```js
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const { red, white, blue, bold } = require('kleur');
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// basic usage
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red('red text');
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// chained methods
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blue().bold().underline('howdy partner');
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// nested methods
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bold(`${ white().bgRed('[ERROR]') } ${ red().italic('Something happened')}`);
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```
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### Chained Methods
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```js
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console.log(bold().red('this is a bold red message'));
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console.log(bold().italic('this is a bold italicized message'));
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console.log(bold().yellow().bgRed().italic('this is a bold yellow italicized message'));
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console.log(green().bold().underline('this is a bold green underlined message'));
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```
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<img src="shots/1.png" width="300" />
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### Nested Methods
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```js
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const { yellow, red, cyan } = require('kleur');
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console.log(yellow(`foo ${red().bold('red')} bar ${cyan('cyan')} baz`));
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console.log(yellow('foo ' + red().bold('red') + ' bar ' + cyan('cyan') + ' baz'));
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```
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<img src="shots/2.png" width="300" />
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### Conditional Support
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Toggle color support as needed; `kleur` includes simple auto-detection which may not cover all cases.
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```js
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const kleur = require('kleur');
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// manually disable
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kleur.enabled = false;
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// or use another library to detect support
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kleur.enabled = require('color-support').level;
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console.log(kleur.red('I will only be colored red if the terminal supports colors'));
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```
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## API
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Any `kleur` method returns a `String` when invoked with input; otherwise chaining is expected.
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> It's up to the developer to pass the output to destinations like `console.log`, `process.stdout.write`, etc.
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The methods below are grouped by type for legibility purposes only. They each can be [chained](#chained-methods) or [nested](#nested-methods) with one another.
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***Colors:***
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> black — red — green — yellow — blue — magenta — cyan — white — gray — grey
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***Backgrounds:***
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> bgBlack — bgRed — bgGreen — bgYellow — bgBlue — bgMagenta — bgCyan — bgWhite
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***Modifiers:***
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> reset — bold — dim — italic* — underline — inverse — hidden — strikethrough*
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<sup>* <em>Not widely supported</em></sup>
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## Benchmarks
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> Using Node v10.13.0
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### Load time
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```
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chalk :: 14.543ms
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kleur :: 0.474ms
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ansi-colors :: 1.923ms
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```
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### Performance
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```
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# All Colors
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ansi-colors x 199,381 ops/sec ±1.04% (96 runs sampled)
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chalk x 12,107 ops/sec ±2.07% (87 runs sampled)
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kleur x 715,334 ops/sec ±0.30% (93 runs sampled)
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# Stacked colors
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ansi-colors x 24,494 ops/sec ±1.03% (93 runs sampled)
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chalk x 2,650 ops/sec ±2.06% (85 runs sampled)
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kleur x 75,798 ops/sec ±0.19% (97 runs sampled)
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# Nested colors
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ansi-colors x 77,766 ops/sec ±0.32% (94 runs sampled)
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chalk x 5,596 ops/sec ±1.85% (86 runs sampled)
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kleur x 137,660 ops/sec ±0.31% (93 runs sampled)
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```
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## Credits
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This project originally forked [Brian Woodward](https://github.com/doowb)'s awesome [`ansi-colors`](https://github.com/doowb/ansi-colors) library.
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Beginning with `kleur@3.0`, the Chalk-style syntax (magical getter) has been replaced with function calls per key:
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```js
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// Old:
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c.red.bold.underline('old');
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// New:
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c.red().bold().underline('new');
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```
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> <sup><em>As I work more with Rust, the newer syntax feels so much better & more natural!</em></sup>
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If you prefer the old syntax, you may migrate to `ansi-colors`. Versions below `kleur@3.0` have been deprecated.
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## License
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MIT © [Luke Edwards](https://lukeed.com)
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