commit 20f5780b1abff1a021d15fe28e6ae9a528cda2ef
Author: skscript <skscript@076.ne.jp>
Date:   Sat Oct 28 12:11:47 2023 +0900

    add kemono.user.js

diff --git a/kemono.user.js b/kemono.user.js
new file mode 100644
index 0000000..eb112f0
--- /dev/null
+++ b/kemono.user.js
@@ -0,0 +1,152 @@
+// ==UserScript==
+// @name         Go to kemono.party
+// @name:ja      kemono.partyへ移動
+// @namespace    https://greasyfork.org/ja/users/1126644-s-k-script
+// @version      0.1.2
+// @description  Go to kemono.party from an artist's page. Supports Patreon, Pixiv, Fanbox and Fantia
+// @description:ja  アーティストのページから対応するkemono.partyのページへ移動します。Pixiv, Fanbox, Fantia, Patreonをサポートしています。
+// @author       S.K.Script
+// @homepage     https://greasyfork.org/ja/users/1126644-s-k-script
+// @license      GPL-3.0-only
+// @match        https://fantia.jp/*
+// @match        https://*.fanbox.cc/*
+// @match        https://www.pixiv.net/*
+// @match        https://www.patreon.com/*
+// @icon         https://www.google.com/s2/favicons?sz=64&domain=kemono.party
+// @grant        none
+// @run-at context-menu
+// ==/UserScript==
+
+(function() {
+    'use strict';
+
+    class FantiaUrl {
+        static check(href) {
+            return !!href.match(/^https:\/\/fantia.jp/i);
+        }
+
+        constructor(href) {
+            this.href = href;
+        }
+
+        extract_user_id() {
+            const re = /https:\/\/fantia.jp\/fanclubs\/(?<userid>\d+)/i;
+            const match = this.href.match(re);
+            if(match) {
+                return {ok: match.groups.userid};
+            }
+            else {
+                return {err: 'Try again in the top page of this fanclub.\nファンクラブのトップページに移動してからもう一度実行してください'};
+            }
+        }
+
+        generate_kemono_url(user_id) {
+            return 'https://kemono.party/fantia/user/' + user_id;
+        }
+    }
+
+    class FanboxUrl {
+        static check(href) {
+            return !!href.match(/^https:\/\/\w+.fanbox.cc/i);
+        }
+
+        constructor(href) {
+            this.href = href;
+        }
+
+        extract_user_id() {
+            return {err: 'Try again in the Pixiv user page of this person. Note: Pixiv and Fanbox are run by the same company.\nこの人のPixiv(Fanboxではなく)のユーザーページへ移動してからもう一度実行してください'};
+        }
+
+        generate_kemono_url(user_id) {
+            return 'https://kemono.party/fanbox/user/' + user_id;
+        }
+    }
+
+    class PixivUrl {
+        static check(href) {
+            return !!href.match(/https:\/\/www.pixiv.net/i);
+        }
+
+        constructor(href) {
+            this.href = href;
+        }
+
+        extract_user_id() {
+            const re = /https:\/\/www.pixiv.net\/users\/(?<userid>\d+)/i;
+            const match = href.match(re);
+            if(match) {
+                return {ok: match.groups.userid};
+            }
+            else {
+                return {err: 'Try again in the Pixiv user page of this person.\nPixivのユーザーページに移動してからもう一度実行してください'};
+            }
+        }
+
+        generate_kemono_url(user_id) {
+            return 'https://kemono.party/fanbox/user/' + user_id;
+        }
+    }
+
+    class PatreonUrl {
+        static check(href) {
+            return !!href.match(/https:\/\/www.patreon.com/i);
+        }
+
+        constructor(href) {
+            this.href = href;
+        }
+
+        extract_user_id() {
+            // https://www.patreon.com/user?u=35870453
+            const re = /https:\/\/www.patreon.com\/user\?u=(?<userid>\d+)/i;
+            const match = href.match(re);
+            if(match) {
+                return {ok: match.groups.userid};
+            }
+            else {
+                return {err: 'Try again in the Patreon user page of this person.\nPatreonのユーザーページに移動してからもう一度実行してください'};
+            }
+        }
+
+        generate_kemono_url(user_id) {
+            return 'https://kemono.party/patreon/user/' + user_id;
+        }
+    }
+
+    const href = location.href;
+
+    let url;
+    if(FantiaUrl.check(href)) {
+        url = new FantiaUrl(href);
+    }
+    else if(FanboxUrl.check(href)) {
+        url = new FanboxUrl(href);
+    }
+    else if(PixivUrl.check(href)) {
+        url = new PixivUrl(href);
+    }
+    else if(PatreonUrl.check(href)) {
+        url = new PatreonUrl(href);
+    }
+    else {
+        url = undefined;
+    }
+
+    if(!url) {
+        window.alert('Not supported / 未対応/非対応です');
+        return;
+    }
+
+    const result = url.extract_user_id();
+    if(result.ok) {
+        const user_id = result.ok;
+        const kemono_url = url.generate_kemono_url(user_id);
+        window.open(kemono_url, '_blank');
+    }
+    else {
+        const err_message = result.err ? result.err : 'Error / なんかエラーだって';
+        window.alert(err_message);
+    }
+
+})();
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