Quick and dirty way of find unique RGB(A) colors in a CSS file.

uniqueColors.js

var _ = require("lodash");
var fs = require("fs");
var parser = require("css");

var file = fs.readFileSync("./css/pagedetail.css", "utf-8").toString();

var parsed = parser.parse(file);

var uniqueColors = _.chain(parsed.stylesheet.rules)
				// Get declarations for each rule
				.pluck("declarations")
				// Remove falsey values from array
				.compact()
				// Flatten nested declarations
				.flatten()
				// Get the value from each declaration
				.pluck("value")
				// Retrieve all rgb(a) strings from the value
				.map(function(value) {
					return value.match(/rgba?\([^\)]*\)/g);
				})
				// Flatten nested rgb(a) strings
				.flatten()
				// Just the unique colors please
				.uniq()
				// Get the result array from the LoDash object
				.value();

console.log(uniqueColors.join("\n"));