Allow song randomization when tags are duplicated

bin/tag-reader-dummy

@@ -24,7 +24,7 @@ var html = `
   <h1>tag-reader-dummy</h1>
   <form method="post" class="pure-form">
     <input class="pure-button pure-button-primary" type="submit" name="uid" value="12121212">
-    OK Then.mp3
+    OK Then.mp3 / Other.mp3
   </form>
   <form method="post" class="pure-form">
     <input class="pure-button pure-button-primary" type="submit" name="uid" value="BADC0FFEE">

jukebox/library/file-backend.js

@@ -2,6 +2,11 @@
 
 const glob = require('glob');
 
+function pickRandom(arr) {
+  var index = Math.floor(Math.random() * arr.length);
+  return arr[index];
+}
+
 class FileBackend {
   constructor(config) {
     this.config = config;
@@ -10,7 +15,7 @@ class FileBackend {
   find(tag, callback) {
     glob(this.config.media_path + '/' + tag + ' - *.mp3', (err, files) => {
       if (files.length > 0) {
-        return callback(files[0]);
+        return callback(pickRandom(files));
       }
       callback();
     });