// ==UserScript==
// @name        Fanfiction.net - Customize Default Result Filter
// @namespace   ssokolow.com
// @description Override Fanfiction.net's default choices for result filters
// @version     1
// @license     MIT
//
// @grant       GM_getValue
// @grant       GM_setValue
// @grant       GM_registerMenuCommand
//
// @noframes
// @match       *://www.fanfiction.net/*
// @downloadURL none
// ==/UserScript==

// TODO: Try to find a way to safely URL-match so I can minimize the number
//       of cases where I need to redirect and use @run-at document-start
//       for the rest.
var has_filters = document.getElementById('filters') !== null;
var preferred_filter = GM_getValue('preferred_filter');

if (preferred_filter && window.location.search === "" && has_filters) {
  window.location.search = preferred_filter;
}

if (has_filters) {
  GM_registerMenuCommand("Save Current Filters as Default", function() {
    GM_setValue('preferred_filter', window.location.search);
  }, 'S');
}