1 files changed, 80 insertions, 0 deletions
diff --git a/src/main/java/me/djtheredstoner/perspectivemod/forge/PerspectiveTweaker.java b/src/main/java/me/djtheredstoner/perspectivemod/forge/PerspectiveTweaker.java
new file mode 100644
index 0000000..f22ba05
--- /dev/null
+++ b/src/main/java/me/djtheredstoner/perspectivemod/forge/PerspectiveTweaker.java
@@ -0,0 +1,80 @@
+package me.djtheredstoner.perspectivemod.forge;
+
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import net.minecraft.launchwrapper.Launch;
+import net.minecraftforge.common.ForgeVersion;
+import net.minecraftforge.fml.relauncher.IFMLLoadingPlugin;
+
+import javax.swing.JOptionPane;
+import java.io.File;
+import java.io.InputStream;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.Map;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipFile;
+
+// this one will be loaded in prod, used to detect Canelex's perspective mod
+@IFMLLoadingPlugin.MCVersion(ForgeVersion.mcVersion)
+public class PerspectiveTweaker implements IFMLLoadingPlugin {
+
+    public PerspectiveTweaker() {
+        File mods = new File(Launch.minecraftHome, "mods");
+
+        if (!mods.exists()) {
+            mods.mkdirs(); // mods folder may not exist in dev yet
+        }
+
+        File[] coreModList = mods.listFiles((dir, name) -> name.endsWith(".jar"));
+        for (File file : coreModList) {
+            try {
+                try (ZipFile zipFile = new ZipFile(file)) {
+                    if (zipFile.getEntry("net/canelex/perspectivemod/PerspectiveMod.class") != null) {
+                        halt("<html><p>Perspective Mod v4 is not compatible with Perspective Mod v3 by Canelex. Please remove Canelex's in order to launch the game.</p></html>");
+                        continue;
+                    }
+                }
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    private void halt(final String message) {
+        JOptionPane.showMessageDialog(null, message, "Launch Aborted", JOptionPane.ERROR_MESSAGE);
+        try {
+            final Class<?> aClass = Class.forName("java.lang.Shutdown");
+            final Method exit = aClass.getDeclaredMethod("exit", int.class);
+            exit.setAccessible(true);
+            exit.invoke(null, 0);
+        } catch (ClassNotFoundException | NoSuchMethodException | IllegalAccessException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Override
+    public String[] getASMTransformerClass() {
+        return new String[0];
+    }
+
+    @Override
+    public String getModContainerClass() {
+        return null;
+    }
+
+    @Override
+    public String getSetupClass() {
+        return null;
+    }
+
+    @Override
+    public void injectData(Map<String, Object> map) {
+
+    }
+
+    @Override
+    public String getAccessTransformerClass() {
+        return null;
+    }
+}