Trello: Hide all cards that have specific color labels

trello-hide-labelled-cards.user.js

// ==UserScript==
// @name trello-hide-labelled-cards
// @namespace trello
// @version 0.1
// @require http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js
// @description Trello: Hide all cards that have specific color labels
// @match https://trello.com/board/*
// @copyright 2013+, Bruno Binet
// ==/UserScript==

// list of label colors for cards to be hidden
var hidden_colors = ["purple"];

var hide_cards = function() {
  for (var i=0, len=hidden_colors.length; i<len; i++) {
    $(".list-card:has(." + hidden_colors[i] + "-label)").addClass("hide");
  }
};

$(document).ready(function() {
  setInterval(hide_cards, 10000);
});