Fix world not loading when the world name has . in it

src/main/java/org/mvplugins/multiverse/core/world/WorldsConfigManager.java

@@ -121,7 +121,11 @@
      * @return A tuple containing a list of the new WorldConfigs added and a list of the worlds removed from the config.
      */
     private NewAndRemovedWorlds parseNewAndRemovedWorlds() {
-        Set<String> allWorldsInConfig = worldsConfig.getKeys(false);
+        List<String> allWorldsInConfig = worldsConfig.getKeys(false)
+                .stream()
+                .map(this::decodeWorldName)
+                .toList();
+
         List<WorldConfig> newWorldsAdded = new ArrayList<>();
 
         for (String worldName : allWorldsInConfig) {
@@ -174,7 +178,7 @@
                 worldConfig.save().onFailure(e -> {
                     throw new RuntimeException("Failed to save world config: " + worldName, e);
                 });
-                worldsConfig.set(worldName, worldConfig.getConfigurationSection());
+                worldsConfig.set(encodeWorldName(worldName), worldConfig.getConfigurationSection());
             });
             worldsConfig.save(worldConfigFile);
         }).onFailure(e -> {
@@ -214,7 +218,7 @@
      */
     public void deleteWorldConfig(@NotNull String worldName) {
         worldConfigMap.remove(worldName);
-        worldsConfig.set(worldName, null);
+        worldsConfig.set(encodeWorldName(worldName), null);
     }
 
     /**
@@ -225,11 +229,23 @@
      * @return The {@link ConfigurationSection} for the given world.
      */
     private ConfigurationSection getWorldConfigSection(String worldName) {
+        worldName = encodeWorldName(worldName);
         return worldsConfig.isConfigurationSection(worldName)
                 ? worldsConfig.getConfigurationSection(worldName)
                 : worldsConfig.createSection(worldName);
     }
 
+    /**
+     * Dot is a special character in YAML that causes sub-path issues.
+     */
+    private String encodeWorldName(String worldName) {
+        return worldName.replace(".", "[dot]");
+    }
+
+    private String decodeWorldName(String worldName) {
+        return worldName.replace("[dot]", ".");
+    }
+
     private static final class ConfigMigratedException extends RuntimeException {
         private ConfigMigratedException() {
             super("Config migrated");

src/test/java/org/mvplugins/multiverse/core/world/WorldConfigMangerTest.kt

@@ -63,11 +63,16 @@ class WorldConfigMangerTest : TestWithMockBukkit() {
 
     @Test
     fun `Add a new world to config`() {
-        val worldConfig = worldConfigManager.addWorldConfig("newworld")
+        val worldConfig = worldConfigManager.addWorldConfig("new.world")
         assertNotNull(worldConfig)
-        assertEquals("newworld", worldConfig.worldName)
+        assertEquals("new.world", worldConfig.worldName)
         assertTrue(worldConfigManager.save().isSuccess)
         assertConfigEquals("/worlds/newworld_worlds.yml", "worlds.yml")
+
+        // Make sure the world still can be loaded after save
+        assertTrue(worldConfigManager.load().isSuccess)
+        assertEquals("new.world", worldConfigManager.getWorldConfig("new.world").orNull?.worldName)
+        assertConfigEquals("/worlds/newworld_worlds.yml", "worlds.yml")
     }
 
     @Test

src/test/resources/worlds/newworld_worlds.yml

@@ -74,7 +74,7 @@ world_nether:
   spawning: {}
   world-blacklist: []
   version: 1.2
-newworld:
+new[dot]world:
   adjust-spawn: false
   alias: ''
   allow-advancement-grant: true