new plugin: themeAttributes (#1686)

src/plugins/themeAttributes/README.md

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+# ThemeAttributes
+
+This plugin adds data attributes to various elements inside Discord
+
+This allows themes to more easily theme those elements or even do things that otherwise wouldn't be possible
+
+## Available Attributes
+
+### All Tab Bars (User Settings, Server Settings, etc)
+
+`data-tab-id` contains the id of that tab
+
+![image](https://github.com/Vendicated/Vencord/assets/45497981/1263b782-f673-4f09-820c-4cc366d062ad)
+
+### Chat Messages
+
+- `data-author-id` contains the id of the author
+- `data-is-self` is a boolean indicating whether this is the current user's message
+
+![image](https://github.com/Vendicated/Vencord/assets/45497981/34bd5053-3381-402f-82b2-9c812cc7e122)

src/plugins/themeAttributes/index.ts

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+/*
+ * Vencord, a Discord client mod
+ * Copyright (c) 2023 Vendicated and contributors
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+import { Devs } from "@utils/constants";
+import definePlugin from "@utils/types";
+import { UserStore } from "@webpack/common";
+import { Message } from "discord-types/general";
+
+export default definePlugin({
+    name: "ThemeAttributes",
+    description: "Adds data attributes to various elements for theming purposes",
+    authors: [Devs.Ven],
+
+    patches: [
+        // Add data-tab-id to all tab bar items
+        // This for examples applies to the User and Server settings sidebars
+        {
+            find: ".tabBarRef",
+            replacement: {
+                match: /style:this\.getStyle\(\),role:"tab"/,
+                replace: "$&,'data-tab-id':this.props.id"
+            }
+        },
+
+        // Add data-author-id and data-is-self to all messages
+        {
+            find: ".messageListItem",
+            replacement: {
+                match: /\.messageListItem(?=,"aria)/,
+                replace: "$&,...$self.getMessageProps(arguments[0])"
+            }
+        }
+    ],
+
+    getMessageProps(props: { message: Message; }) {
+        const authorId = props.message?.author?.id;
+        return {
+            "data-author-id": authorId,
+            "data-is-self": authorId && authorId === UserStore.getCurrentUser()?.id
+        };
+    }
+});