Add IrcColors plugin (#2048)

Co-authored-by: V <vendicated@riseup.net>

src/plugins/ircColors/README.md

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+# IrcColors
+
+Makes username colors in chat unique, like in IRC clients
+
+![Chat with IrcColors and Compact++ enabled](https://github.com/Vendicated/Vencord/assets/33988779/88e05c0b-a60a-4d10-949e-8b46e1d7226c)
+
+Improves chat readability by assigning every user an unique nickname color,
+making distinguishing between different users easier. Inspired by the feature
+in many IRC clients, such as HexChat or WeeChat.
+
+Keep in mind this overrides role colors in chat, so if you wish to know
+someone's role color without checking their profile, enable the role dot: go to
+**User Settings**, **Accessibility** and switch **Role Colors** to **Show role
+colors next to names**.
+
+Created for use with the [Compact++](https://gitlab.com/Grzesiek11/compactplusplus-discord-theme)
+theme.

src/plugins/ircColors/index.ts

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+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2023 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 { definePluginSettings } from "@api/Settings";
+import { Devs } from "@utils/constants";
+import definePlugin, { OptionType } from "@utils/types";
+
+// Compute a 64-bit FNV-1a hash of the passed data
+function hash(id: bigint) {
+    const fnvPrime = 1099511628211n;
+    const offsetBasis = 14695981039346656037n;
+
+    let result = offsetBasis;
+    for (let i = 7n; i >= 0n; i--) {
+        result ^= (id >> (8n * i)) & 0xffn;
+        result = (result * fnvPrime) % 2n ** 32n;
+    }
+
+    return result;
+}
+
+// Calculate a CSS color string based on the user ID
+function calculateNameColorForUser(id: bigint) {
+    const idHash = hash(id);
+
+    return `hsl(${idHash % 360n}, 100%, ${settings.store.lightness}%)`;
+}
+
+const settings = definePluginSettings({
+    lightness: {
+        description: "Lightness, in %. Change if the colors are too light or too dark. Reopen the chat to apply.",
+        type: OptionType.NUMBER,
+        default: 70,
+    },
+    memberListColors: {
+        description: "Replace role colors in the member list",
+        restartNeeded: true,
+        type: OptionType.BOOLEAN,
+        default: true,
+    },
+});
+
+export default definePlugin({
+    name: "IrcColors",
+    description: "Makes username colors in chat unique, like in IRC clients",
+    authors: [Devs.Grzesiek11],
+    patches: [
+        {
+            find: '="SYSTEM_TAG"',
+            replacement: {
+                match: /(?<=className:\i\.username,style:.{0,50}:void 0,)/,
+                replace: "style:{color:$self.calculateNameColorForMessageContext(arguments[0])},",
+            },
+        },
+        {
+            find: ".NameWithRole,{roleName:",
+            replacement: {
+                match: /(?<=color:)null!=.{0,50}?(?=,)/,
+                replace: "$self.calculateNameColorForListContext(arguments[0])",
+            },
+            predicate: () => settings.store.memberListColors,
+        },
+    ],
+    settings,
+    calculateNameColorForMessageContext(context: any) {
+        const id = context?.message?.author?.id;
+        if (id == null) {
+            return null;
+        }
+        return calculateNameColorForUser(BigInt(id));
+    },
+    calculateNameColorForListContext(context: any) {
+        const id = context?.user?.id;
+        if (id == null) {
+            return null;
+        }
+        return calculateNameColorForUser(BigInt(id));
+    },
+});