lightOrDark :3

src/libpoketube/init/pages-video.js

@@ -20,6 +20,51 @@ const {
 
 const sha384 = modules.hash;
 
+function lightOrDark(color) {
+
+    // Variables for red, green, blue values
+    var r, g, b, hsp;
+    
+    // Check the format of the color, HEX or RGB?
+    if (color.match(/^rgb/)) {
+
+        // If RGB --> store the red, green, blue values in separate variables
+        color = color.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+(?:\.\d+)?))?\)$/);
+        
+        r = color[1];
+        g = color[2];
+        b = color[3];
+    } 
+    else {
+        
+        // If hex --> Convert it to RGB: http://gist.github.com/983661
+        color = +("0x" + color.slice(1).replace( 
+        color.length < 5 && /./g, '$&$&'));
+
+        r = color >> 16;
+        g = color >> 8 & 255;
+        b = color & 255;
+    }
+    
+    // HSP (Highly Sensitive Poo) equation from http://alienryderflex.com/hsp.html
+    hsp = Math.sqrt(
+    0.299 * (r * r) +
+    0.587 * (g * g) +
+    0.114 * (b * b)
+    );
+
+    // Using the HSP value, determine whether the color is light or dark
+    if (hsp>127.5) {
+
+        return 'light';
+    } 
+    else {
+
+        return 'dark';
+    }
+}
+
+ 
 module.exports = function (app, config, renderTemplate) {
   app.get("/encryption", async function (req, res) {
     var v = req.query.v;
@@ -115,6 +160,7 @@ module.exports = function (app, config, renderTemplate) {
 
             renderTemplate(res, req, "poketube.ejs", {
               color: data.color,
+              color2:data.color2,
               engagement: engagement,
               video: json,
               date: k.Video.uploadDate,
@@ -122,6 +168,7 @@ module.exports = function (app, config, renderTemplate) {
               k: k,
               process: process,
               sha384: sha384,
+              lightOrDark,
               isMobile: req.useragent.isMobile,
               tj: data.channel,
               r: r,