1. // ==UserScript==
2. // @name         Youtube old design
3. // @namespace    4c5725cd7d4b94b6f1784e759d5a43fbdd917971
4. // @version      0.1
5. // @description  Activates the old YT design without messing with your other settings
6. // @author       /u/AyrA_ch
7. // @match        https://www.youtube.com/*
8. // @match        http://www.youtube.com/*
9. // @match        https://youtube.com/*
10. // @match        http://youtube.com/*
11. // @grant        none
12. // @run-at       document-start
13. // ==/UserScript==
14.  
15. (function () {
16.     var getDesignCookie = function (cookie) {
17.         //Find existing preferences
18.         var prefs = cookie.split("; ").filter(function (v) {
19.                 return v.indexOf("PREF=") === 0;
20.             })[0];
21.         //No preferences, return new ones with design setting
22.         if (!prefs) {
23.             console.log("prefs not set in cookie");
24.             return "PREF=f6=8";
25.         }
26.         //Process all settings
27.         var entries = prefs.substr(5).split('&');
28.         var set = false;
29.         for (var i = 0; i < entries.length; i++) {
30.             if (entries[i].indexOf("f6=") === 0) {
31.                 set = true;
32.                 //Set the old design flag
33.                 var value = +entries[i].substr(3);
34.                 if ((value & 8) === 0) {
35.                     console.log("Activating old design and reloading...");
36.                     entries[i] = "f6=" + (value | 8);
37.                     window.setTimeout(location.reload.bind(location,true),100);
38.                 }
39.                 else{
40.                     console.log("Old design already active. Doing nothing");
41.                 }
42.             }
43.         }
44.         //Design flag setting doesn't exists. Adding it instead
45.         if (!set) {
46.             console.log("Activating old design and reloading...");
47.             entries.push("f6=8");
48.             window.setTimeout(location.reload.bind(location,true),100);
49.         }
50.         //Build cookie
51.         return "PREF=" + entries.join('&');
52.     };
53.     //Update cookie
54.     document.cookie = getDesignCookie(document.cookie) + ";domain=.youtube.com;path=/";
55. })();
56.  
57. /*
58. LICENSE:
59. This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
60. The full license text can be found here: http://creativecommons.org/licenses/by-nc-sa/4.0/
61. The link has an easy to understand version of the license and the full license text.
62.  
63. DISCLAIMER:
64. THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES,
65. INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
66. A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
67. LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
68. DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
69. OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
70. LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
71. OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
72. THE POSSIBILITY OF SUCH DAMAGE.
73. */