/
rainbow.js
41 lines (33 loc) 路 935 Bytes
/
rainbow.js
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'use strict';
const chalk = require('..');
const ignoreChars = /[^!-~]/g;
const delay = milliseconds => new Promise(resolve => setTimeout(resolve, milliseconds));
function rainbow(string, offset) {
if (!string || string.length === 0) {
return string;
}
const hueStep = 360 / string.replace(ignoreChars, '').length;
let hue = offset % 360;
const characters = [];
for (const character of string) {
if (character.match(ignoreChars)) {
characters.push(character);
} else {
characters.push(chalk.hsl(hue, 100, 50)(character));
hue = (hue + hueStep) % 360;
}
}
return characters.join('');
}
async function animateString(string) {
console.log();
for (let i = 0; i < 360 * 5; i++) {
console.log('\u001B[1F\u001B[G', rainbow(string, i));
await delay(2); // eslint-disable-line no-await-in-loop
}
}
(async () => {
console.log();
await animateString('We hope you enjoy Chalk! <3');
console.log();
})();