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DanielTepesKraus / Derpibooru Reverse Image Search

// ==UserScript==
// @name        Derpibooru Reverse Image Search
// @namespace   Derpibooru Reverse Image Search
// @description Adds a dropdown menu to reverse-search images on various websites
// @author      DanielTepesKraus || https://www.derpibooru.org/profiles/DanielTepesKraus
// @include     https://*derpibooru.org/*
// @include     *derpibooru.org*
// @include     https://*trixiebooru.org/*
// @include     *trixiebooru.org/*
// @version     2.0
// @grant       none
// ==/UserScript==

var FirstHalfLinks = ["",
                      "https://www.google.com/searchbyimage?image_url=",
                      "http://www.bing.com/images/searchbyimage?FORM=IRSBIQ&cbir=sbi&imgurl=", 
                      "http://www.tineye.com/search/?url=",
                      "http://saucenao.com/search.php?url=", 
                      "http://iqdb.org/?url=", 
                      "http://www.doujinshi.org/IMGSERV/socket.php?URL=", 
                      "http://yandex.ru/images/search?img_url="];

var ReverseDrop = document.createElement("select");
ReverseDrop.className = 'input header__input';
ReverseDrop.id = "ReverseButtons"
ReverseDrop.innerHTML = '<option title="Reverse Search" selected="selected" value="0">Reverse Search</option><option title="Global search using Google. Useful for Deviantart, Tumblr, etc." value="1">Google</option><option title="Global search using Bing. Useful when Google fails." value="2">Bing</option><option title="14.6 billion images indexed and growing." value="3">TinEye</option><option title="Similar to TinEye. Mostly useful for finding Pixiv posts." value="4">SauceNao</option><option title="Searches anime and manga boorus." value="5">iqdb (NSFW)</option><option title="Provides details for doujinshi. Only useful for doujinshi covers." value="6">Doujinshi.org (NSFW)</option><option title="Russian reverse image search (Русский обратный поиск изображений)." value="7">Yandex / Яндекс</option>'

if (document.getElementById("comments")){
  document.getElementById("content").childNodes[0].childNodes[0].appendChild(ReverseDrop);
  ReverseButtons.addEventListener('change',callSearch,false);
}


function callSearch(){
  for (var i = 0; i < document.getElementsByTagName("a").length; i++){
    if (document.getElementsByTagName("a")[i].title == "View this image at full res with a short filename"){
    var LinkGoes = document.getElementsByTagName("a")[i].href;
    }
  }
  if (ReverseDrop.value == 7){
    window.location = FirstHalfLinks[ReverseDrop.value] + LinkGoes + "&rpt=imageview"
  }else{
    window.location = FirstHalfLinks[ReverseDrop.value] + LinkGoes
  }
}