Knockback module

src/main/java/eu/m724/tweaks/TweaksConfig.java

@@ -9,6 +9,8 @@ package eu.m724.tweaks;
 import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.plugin.Plugin;
 
+import java.util.Map;
+
 public record TweaksConfig(
         boolean metrics,
         boolean debug,
@@ -53,7 +55,9 @@ public record TweaksConfig(
         String authDomain,
 
         boolean redstoneEnabled,
-        String redstoneListen
+        String redstoneListen,
+
+        Map<String, Object> knockbackModifiers
 ) {
     public static final int CONFIG_VERSION = 1;
     private static TweaksConfig config;
@@ -121,6 +125,9 @@ public record TweaksConfig(
         boolean redstoneEnabled = config.getBoolean("retstone.enabled");
         String redstoneListen = config.getString("retstone.listen");
 
+        // this is processed when initing
+        Map<String, Object> knockbackModifiers = config.getConfigurationSection("knockback").getValues(false);
+
         TweaksConfig.config = new TweaksConfig(
                 debug, metrics, locale,
                 worldborderExpand, worldborderHide,
@@ -134,7 +141,8 @@ public record TweaksConfig(
                 hardcoreEnabled, hardcoreChance,
                 sleepEnabled, sleepInstant,
                 authEnabled, authForce, authHostname,
-                redstoneEnabled, redstoneListen
+                redstoneEnabled, redstoneListen,
+                knockbackModifiers
         );
 
         return TweaksConfig.config;

src/main/java/eu/m724/tweaks/knockback/KnockbackListener.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2024  Minecon724
+ * Tweaks724 is licensed under the GNU General Public License. See the LICENSE.md file
+ * in the project root for the full license text.
+ */
+
+package eu.m724.tweaks.knockback;
+
+import eu.m724.tweaks.DebugLogger;
+import eu.m724.tweaks.TweaksConfig;
+import org.bukkit.entity.EntityType;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.entity.EntityKnockbackByEntityEvent;
+import org.bukkit.plugin.Plugin;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class KnockbackListener implements Listener {
+    private final Map<EntityType, Double> modifiers = new HashMap<>();
+
+    public KnockbackListener(Plugin plugin) {
+        TweaksConfig.getConfig().knockbackModifiers().forEach((k, v) -> {
+            EntityType type;
+            double mod;
+
+            String line = "(%s: %s)".formatted(k, v);
+
+            if (v instanceof Double d) {
+                mod = d;
+            } else if (v instanceof Integer i) {
+                mod = i;
+            } else {
+                DebugLogger.warning("In " + line + " the value is not a number ");
+                return;
+            }
+
+            try {
+                type = EntityType.valueOf(k);
+            } catch (IllegalArgumentException e) {
+                DebugLogger.warning("In" + line + " the key is not a valid entity type");
+                DebugLogger.warning("Valid entity types: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/entity/EntityType.html");
+                return;
+            }
+
+            if (mod == 1) return;
+            modifiers.put(type, mod);
+        });
+
+        if (!modifiers.isEmpty())
+            plugin.getServer().getPluginManager().registerEvents(this, plugin);
+    }
+
+    @EventHandler
+    public void onEntityKnockbackByEntity(EntityKnockbackByEntityEvent event) {
+        var modifier = modifiers.get(event.getSourceEntity().getType());
+        if (modifier != null) {
+            event.setFinalKnockback(event.getKnockback().multiply(modifier));
+        }
+    }
+}

src/main/resources/config.yml

@@ -109,6 +109,14 @@ retstone:
   # This takes host:port, listens on UDP
   listen: 127.0.0.1:57931
 
+# Knockback dealt BY those entities is multiplied by value
+# Entity must be one of https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/entity/EntityType.html
+# 1 means no change
+knockback:
+  player: 0.7
+  tnt: 5
+  creeper: 0.7
+
 # Finally, thank you for downloading Tweaks724, I hope you enjoy!
 
 # Don't modify unless told to