Use GUI installer for pnpm inject/uninject (#407)

* Use GUI installer for pnpm inject/uninject

* Run Installer in DevMode

scripts/runInstaller.mjs

@@ -0,0 +1,97 @@
+/*
+ * 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 { execFileSync } from "child_process";
+import { createWriteStream, existsSync, mkdirSync, readFileSync, writeFileSync } from "fs";
+import { dirname, join } from "path";
+import { Readable } from "stream";
+import { finished } from "stream/promises";
+import { fileURLToPath } from "url";
+
+const BASE_URL = "https://github.com/Vencord/Installer/releases/latest/download/";
+
+const DIST_DIR = join(dirname(fileURLToPath(import.meta.url)), "..");
+const FILE_DIR = join(DIST_DIR, "dist", "Installer");
+const ETAG_FILE = join(FILE_DIR, "etag.txt");
+
+function getFilename() {
+    switch (process.platform) {
+        case "win32":
+            return "VencordInstaller.exe";
+        case "darwin":
+            // return "VencordInstaller.MacOS.zip";
+            throw new Error("PR Mac support if you want it. Or use a better OS that doesn't suck");
+        case "linux":
+            return "VencordInstaller-" + (process.env.WAYLAND_DISPLAY ? "wayland" : "x11");
+        default:
+            throw new Error("Unsupported platform: " + process.platform);
+    }
+}
+
+async function ensureBinary() {
+    const filename = getFilename();
+    console.log("Downloading " + filename);
+
+    mkdirSync(FILE_DIR, { recursive: true });
+
+    const installerFile = join(FILE_DIR, filename);
+    const etag = existsSync(installerFile) && existsSync(ETAG_FILE) ? readFileSync(ETAG_FILE, "utf-8") : null;
+
+    const res = await fetch(BASE_URL + filename, {
+        headers: {
+            "User-Agent": "Vencord (https://github.com/Vendicated/Vencord)",
+            "If-None-Match": etag
+        }
+    });
+    if (res.status === 304) {
+        console.log("Up to date, not redownloading!");
+        return installerFile;
+    }
+
+    if (!res.ok) {
+        throw new Error(`Failed to download installer: ${res.status} ${res.statusText}`);
+    }
+
+    const newEtag = res.headers.get("etag");
+    writeFileSync(ETAG_FILE, newEtag);
+
+    // WHY DOES NODE FETCH RETURN A WEB STREAM OH MY GOD
+    const body = Readable.fromWeb(res.body);
+    await finished(body.pipe(createWriteStream(installerFile, {
+        mode: 0o755,
+        autoClose: true
+    })));
+
+    console.log("Finished downloading!");
+
+    return installerFile;
+}
+
+
+console.log("Now running Installer...");
+
+const installerBin = await ensureBinary();
+
+execFileSync(installerBin, {
+    stdio: "inherit",
+    env: {
+        ...process.env,
+        VENCORD_USER_DATA_DIR: DIST_DIR,
+        VENCORD_DEV_INSTALL: "1"
+    }
+});