feat: add a function to launch the game

src/core/arguments.ts

@@ -122,7 +122,29 @@ export async function generateLaunchArguments(
     p(game, arg);
   }
 
+  if (options.customJvm !== "") {
+    for (const arg of options.customJvm.split(" ")) {
+      jvm.push(arg);
+    }
+  }
+
   const log4j = await getArgument(versionManifest, gameRoot);
 
-  return `${getJavaExecutable(javaRoot)} ${jvm.join(" ")}${options.customJvm === "" ? "" : ` ${options.customJvm}`} -Xms${options.minRam} -Xmx${options.maxRam} -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M ${log4j} ${versionManifest.mainClass} ${game.join(" ")}`;
+  return {
+    command: getJavaExecutable(javaRoot),
+    args: [
+      ...jvm,
+      `-Xms${options.minRam}`,
+      `-Xmx${options.maxRam}`,
+      "-XX:+UnlockExperimentalVMOptions",
+      "-XX:+UseG1GC",
+      "-XX:G1NewSizePercent=20",
+      "-XX:G1ReservePercent=20",
+      "-XX:MaxGCPauseMillis=50",
+      "-XX:G1HeapRegionSize=32M",
+      log4j,
+      versionManifest.mainClass,
+      ...game,
+    ],
+  };
 }

src/core/index.ts

@@ -1,8 +1,8 @@
-export * as version from "./version";
-export * as arguments from "./arguments";
-export * as log4j from "./log4j";
-
 export { AssetsDownloader } from "./assets";
 export { LibrariesDownloader } from "./libraries";
 export { NativesDownloader } from "./natives";
 export * as java from "./java";
+export * as version from "./version";
+export * as arguments from "./arguments";
+export * as log4j from "./log4j";
+export { launch } from "./launch";

src/core/launch.ts

@@ -0,0 +1,15 @@
+import { spawn } from "child_process";
+import { LaunchArguments } from "../utils/types";
+
+export function launch(
+  launchArguments: LaunchArguments,
+  gameRoot: string,
+  detached = false,
+) {
+  console.log(gameRoot)
+  const process = spawn(launchArguments.command, launchArguments.args, { detached });
+
+  console.log(process.spawnargs.join(" "))
+
+  return process;
+}

src/utils/types.ts

@@ -175,3 +175,5 @@ export type Auth = {
     clientId: string;
   };
 };
+
+export type LaunchArguments = { command: string; args: string[] }