Danbooru to Gelbooru Search Switcher and vice versa

Add buttons to switch between Danbooru and Gelbooru searches

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name Danbooru to Gelbooru Search Switcher and vice versa
// @namespace https://greasyfork.org/en/users/187317-funkyjustin
// @version 0.9
// @description Add buttons to switch between Danbooru and Gelbooru searches
// @author FunkyJustin
// @license MIT
// @match https://danbooru.donmai.us/*
// @match https://gelbooru.com/*
// @grant GM_addStyle
// ==/UserScript==
(function() {
    'use strict';
    // Add CSS styles
    GM_addStyle(`
    .search-button {
        position: fixed;
        top: 10px;
        left: 50%;
        transform: translateX(-50%);
        padding: 10px;
        background-color: #007bff;
        color: #fff;
        border: none;
        border-radius: 5px;
        text-decoration: none;
        z-index: 9999;
        opacity: 0.5; /* Initially set opacity to 0.5 */
        transition: opacity 0.3s ease; /* Add transition effect */
    }
    .search-button:hover {
        opacity: 1; /* Set opacity to 1 when hovering over the button */
    }
    `);
    // Function to clean and encode tags for URL
    function prepareTags(tags) {
        if (!tags) return '';
        return tags.split(/\s+/).map(t => t.trim()).filter(t => t.length > 0).join('+');
    }
    // Add button to switch to Gelbooru search
    function addGelbooruButton() {
        const url = new URL(window.location.href);
        const tags = url.searchParams.get('tags');
        if (!tags) return;
        const cleanTags = prepareTags(tags);
        if (!cleanTags) return;
        const gelbooruURL = `https://gelbooru.com/index.php?page=post&s=list&tags=${cleanTags}`;
        let gelbooruButton = document.createElement("a");
        gelbooruButton.textContent = "Search on Gelbooru";
        gelbooruButton.href = gelbooruURL;
        gelbooruButton.target = "_blank";
        gelbooruButton.classList.add("search-button");
        document.body.appendChild(gelbooruButton);
    }
    // Add button to switch back to Danbooru search
    function addDanbooruButton() {
        const url = new URL(window.location.href);
        const tags = url.searchParams.get('tags');
        if (!tags) return;
        const cleanTags = prepareTags(tags);
        if (!cleanTags) return;
        const danbooruURL = `https://danbooru.donmai.us/posts?tags=${cleanTags}`;
        let danbooruButton = document.createElement("a");
        danbooruButton.textContent = "Search on Danbooru";
        danbooruButton.href = danbooruURL;
        danbooruButton.target = "_blank";
        danbooruButton.classList.add("search-button");
        document.body.appendChild(danbooruButton);
    }
    // Check if on Danbooru search page and add Gelbooru button
    if (window.location.hostname === 'danbooru.donmai.us' &&
        window.location.pathname === '/posts' &&
        new URL(window.location.href).searchParams.has('tags')) {
        addGelbooruButton();
    }
    // Check if on Gelbooru search page and add Danbooru button
    if (window.location.hostname === 'gelbooru.com' &&
        window.location.pathname === '/index.php' &&
        new URL(window.location.href).searchParams.get('page') === 'post' &&
        new URL(window.location.href).searchParams.get('s') === 'list' &&
        new URL(window.location.href).searchParams.has('tags')) {
        addDanbooruButton();
    }
})();