Added palette generator

palette-gen.js

@@ -0,0 +1,35 @@
+#!/bin/nodejs
+
+const componentToHex = (c) => ("0" + c.toString(16)).slice(-2);
+const rgbToHex = (c) =>  "#" + componentToHex(c.r) + componentToHex(c.g) + componentToHex(c.b);
+const hexToRgb = (hex) => {
+    const result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
+    return result ? {
+        r: parseInt(result[1], 16), g: parseInt(result[2], 16), b: parseInt(result[3], 16)
+    } : null;
+};
+  
+const parseScheme = (str) => str.split(",").map(e=>hexToRgb(e))
+
+const getTint = (c, w) => Math.round(c + (255 - c) * 1 * w);
+const getShade = (c, w) => Math.round(c * w);
+
+const tint = (c, w) => ({r:getTint(c.r,w), g:getTint(c.g,w), b:getTint(c.b,w)});
+const shade = (c, w) => ({r:getShade(c.r,w), g:getShade(c.g,w), b:getShade(c.b,w)});
+
+const tints = (c, w) => Array.from({ length: 100 / w }, (_, i) => tint(c, (i + 1) * w/100));
+const shades = (c, w) => Array.from({ length: 100 / w }, (_, i) => shade(c, (i + 1) * w/100));
+
+const genPalette = (c, w=10) => [...tints(c, w).reverse(), Object.assign(c), ...shades(c, w).reverse()];
+
+
+const readline = require('readline');
+const rl = readline.createInterface({
+    input: process.stdin,
+    output: process.stdout,
+    terminal: false
+});
+
+rl.on('line', (line) => {
+    console.log(parseScheme(line).map(e=>genPalette(e).map(c=>rgbToHex(c))));
+});