rework detect final

README.md

@@ -2,6 +2,6 @@
 
 A mod, a mod whose use you know by heart.
 
-Check `retro` branch for `<= 1.12.2`, `modern` branch (not done yet) for `>= 1.13`.
+Check `retro` branch for `<= 1.12.2`, `modern` branch for `>= 1.13`.
 
 Everything licensed under [Mozilla Public License 2.0](./LICENSE).

src/main/java/gblodb/preventCrappyLauncher/CrappyLauncherError.java

@@ -1,6 +1,6 @@
 package gblodb.preventCrappyLauncher;
 
-public class CrappyLauncherError extends RuntimeException {
+public class CrappyLauncherError extends Error {
     public CrappyLauncherError(String errorMessage) {
         super(errorMessage);
     }

src/main/java/gblodb/preventCrappyLauncher/PreventCrappyLauncher.java

@@ -1,17 +1,32 @@
 package gblodb.preventCrappyLauncher;
 
-import java.io.File;
+import java.io.*;
 import java.util.List;
 import net.minecraft.launchwrapper.ITweaker;
 import net.minecraft.launchwrapper.LaunchClassLoader;
 
 public class PreventCrappyLauncher implements ITweaker {
     @Override
     public void acceptOptions(List<String> args, File gameDir, File assetsDir, String profile) throws CrappyLauncherError {
-        File pclDir = new File(gameDir.getPath() + "\\PCL");
-        if (pclDir.exists()) {
-            throw new CrappyLauncherError("You're using an unsupported launcher.");
+        int count = 0;
+
+        if (!System.getProperty("os.name").toLowerCase().contains("win")) return;
+
+        try {
+            String line;
+            String cmd = System.getenv("windir") + "\\system32\\" + "tasklist.exe" + " /FO csv /FI \"WINDOWTITLE eq Plain Craft Launcher 2\u3000\"";
+            Process pr = new ProcessBuilder(cmd).start();
+            SequenceInputStream sis = new SequenceInputStream(pr.getInputStream(), pr.getErrorStream());
+            InputStreamReader inst = new InputStreamReader(sis);
+            BufferedReader br = new BufferedReader(inst);
+            while ((line = br.readLine()) != null) {
+                if (line.startsWith("\"")) count++;
+            }
+        } catch (Exception ignored) {
+            // lol
         }
+
+        if (count > 1) throw new CrappyLauncherError("You're using an unsupported launcher.");
     }
 
     @Override