Add a patched version of Mihai Potra's find-color script

find-color.js

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+/**
+ * find-color
+ * Copyright(c) 2016 Mihai Potra <mike@mpotra.com>
+ * MIT Licensed
+ */
+
+/**
+ * Find a RGB tuple inside a list of colors.
+ *
+ * Computes the distance between the given RGB color
+ * expressed as a 3D point, and each of the colors in the list.
+ * Returns the color in the list that is closest.
+ *
+ */
+const findNearestRGB = (find, colors) => {
+	var nearest
+
+	if (!find) {
+		return find
+	}
+
+	// For each color in the list, compute the distance to the color
+	// that needs matching.
+	// Formula: sqrt((x1 - x2)^2 + (y1 - y2)^2 + (z1 - z2)^2)
+	nearest = colors
+		.map(color =>
+			Math.sqrt(
+				Math.pow(find[0] - color[0], 2) +
+					Math.pow(find[1] - color[1], 2) +
+					Math.pow(find[2] - color[2], 2)
+			)
+		)
+		// Find the smallest distance.
+		.reduce(
+			(prev, curr, index) => {
+				if ((prev && prev.distance > curr) || !prev) {
+					return {distance: curr, index: index}
+				} else {
+					return prev
+				}
+			},
+			{distance: Infinity, index: -1}
+		)
+
+	return nearest.index >= 0 ? colors[nearest.index] : undefined
+}
+
+/**
+ * Find a color in a list of RGB tuple colors.
+ */
+const find = (color, colors) => {
+	return findNearestRGB(color, colors)
+}
+
+/**
+ * Create an object that allows finding a color,
+ * from an array of RGB tuples.
+ */
+const fromRGB = arrRGB => {
+	return {find: color => find(color, arrRGB)}
+}
+
+/**
+ * Create an object that allows finding a color,
+ * from an array of colors given in HEX.
+ */
+const fromHex = arrHex => {
+	return fromRGB(arrHex.map(color => decodeHex(color)))
+}
+
+/**
+ * Export
+ */
+module.exports = {fromHex, fromRGB, find}