Replace API add/remove funcs with methods in plugin definition (#3028)

src/api/MessageAccessories.tsx

@@ -0,0 +1,68 @@
+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2022 Vendicated and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import ErrorBoundary from "@components/ErrorBoundary";
+import { JSX, ReactNode } from "react";
+
+export type MessageAccessoryFactory = (props: Record<string, any>) => ReactNode;
+export type MessageAccessory = {
+    render: MessageAccessoryFactory;
+    position?: number;
+};
+
+export const accessories = new Map<string, MessageAccessory>();
+
+export function addMessageAccessory(
+    identifier: string,
+    render: MessageAccessoryFactory,
+    position?: number
+) {
+    accessories.set(identifier, {
+        render,
+        position,
+    });
+}
+
+export function removeMessageAccessory(identifier: string) {
+    accessories.delete(identifier);
+}
+
+export function _modifyAccessories(
+    elements: JSX.Element[],
+    props: Record<string, any>
+) {
+    for (const [key, accessory] of accessories.entries()) {
+        const res = (
+            <ErrorBoundary message={`Failed to render ${key} Message Accessory`} key={key}>
+                <accessory.render {...props} />
+            </ErrorBoundary>
+        );
+
+        elements.splice(
+            accessory.position != null
+                ? accessory.position < 0
+                    ? elements.length + accessory.position
+                    : accessory.position
+                : elements.length,
+            0,
+            res
+        );
+    }
+
+    return elements;
+}