feature: Allow starting bot with no intents

Author: queer

src/main/java/com/mewna/catnip/CatnipOptions.java

@@ -140,6 +140,7 @@ public final class CatnipOptions implements CatnipOptionsView, Cloneable {
     private EntityDelegator entityDelegator = new DefaultEntityDelegator();
     private boolean logEventNotInIntentsWarning = true;
     private boolean logEntityPresenceWarningOnCustomCache = true;
+    private boolean iReallyWantToStartTheBotWithNoIntents;
 
     @Override
     public Object clone() {

src/main/java/com/mewna/catnip/internal/CatnipImpl.java

@@ -77,7 +77,7 @@
  */
 @Getter
 @Accessors(fluent = true, chain = true)
-public class CatnipImpl implements Catnip {
+public final class CatnipImpl implements Catnip {
     public static final BouncyCastleProvider BOUNCY_CASTLE_PROVIDER = new BouncyCastleProvider();
     private static final List<String> UNPATCHABLE_OPTIONS = List.of(
             "token",
@@ -136,7 +136,11 @@ private void sanityCheckOptions(@Nonnull final CatnipOptions options) {
             throw new IllegalArgumentException("Minimum required API version is v8!");
         }
         if(options.intents().isEmpty()) {
-            throw new IllegalArgumentException("Intents are required, but you didn't provide any! Are you *sure* you want a bot that can't do anything?");
+            if(options.iReallyWantToStartTheBotWithNoIntents()) {
+                logAdapter().warn("Starting with no intents!");
+            } else {
+                throw new IllegalArgumentException("Intents are required, but you didn't provide any! Are you *sure* you want a bot that can't do anything?");
+            }
         }
     }
 

src/main/java/com/mewna/catnip/util/CatnipOptionsView.java

@@ -394,4 +394,10 @@ public interface CatnipOptionsView {
      * errors that may come from {@link NoopEntityCache}.
      */
     boolean logEntityPresenceWarningOnCustomCache();
+    
+    /**
+     * @return Whether or not you can initialise a {@link Catnip} instance with
+     * no intents.
+     */
+    boolean iReallyWantToStartTheBotWithNoIntents();
 }