Rename the broken config file and regen a new one

src/main/java/org/mvplugins/multiverse/core/configuration/handle/FileConfigurationHandle.java

@@ -2,9 +2,11 @@ package org.mvplugins.multiverse.core.configuration.handle;
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.logging.Logger;
 
+import com.dumptruckman.minecraft.util.Logging;
 import io.vavr.control.Try;
 import org.bukkit.configuration.InvalidConfigurationException;
 import org.bukkit.configuration.file.FileConfiguration;
@@ -39,14 +41,34 @@ public abstract class FileConfigurationHandle<C extends FileConfiguration> exten
      */
     @Override
     public Try<Void> load() {
-        return createConfigFile()
-                .andThenTry(this::loadConfigObject)
-                .andThenTry(() -> {
+        return tryLoadConfigFile().andThenTry(() -> {
             migrateConfig();
             setUpNodes();
         });
     }
 
+    private Try<Void> tryLoadConfigFile() {
+        return Try.run(() -> {
+            createConfigFile();
+            loadConfigObject();
+        }).fold(this::handleLoadConfigFailure, Try::success);
+    }
+
+    private @NotNull Try<Void> handleLoadConfigFailure(Throwable throwable) {
+            Logging.severe("Failed to load config file: " + configFile.getName(), throwable);
+            throwable.printStackTrace();
+            return Try.run(() -> {
+                Path brokenConfigPath = configPath.resolveSibling(configFile.getName() + ".broken." + System.currentTimeMillis());
+                Logging.severe("Moving broken config file to: " + brokenConfigPath.getFileName());
+                Files.copy(configPath, brokenConfigPath);
+                Files.delete(configPath);
+            }).andThenTry(() -> {
+                Logging.severe("Multiverse-Core will now regenerate a fresh config file with all default options!");
+                createConfigFile();
+                loadConfigObject();
+            });
+    }
+
     /**
      * Create a new config file if file does not exist.
      *

src/test/java/org/mvplugins/multiverse/core/config/ConfigTest.kt

@@ -10,10 +10,11 @@ import kotlin.test.*
 class ConfigTest : TestWithMockBukkit() {
 
     private lateinit var config : MVCoreConfig
+    private lateinit var configFile : File
 
     @BeforeTest
     fun setUp() {
-        val configFile = File(Path.of(multiverseCore.dataFolder.absolutePath, "config.yml").absolutePathString())
+        configFile = File(Path.of(multiverseCore.dataFolder.absolutePath, "config.yml").absolutePathString())
         if (configFile.exists()) configFile.delete()
 
         config = serviceLocator.getActiveService(MVCoreConfig::class.java).takeIf { it != null } ?: run {
@@ -104,4 +105,17 @@ class ConfigTest : TestWithMockBukkit() {
         assertTrue(config.stringPropertyHandle.setProperty("invalid-property", false).isFailure)
         assertTrue(config.stringPropertyHandle.setProperty("version", 1.1).isFailure)
     }
+
+    @Test
+    fun `Broken config should regen fresh config`() {
+        val brokenConfigData = getResourceAsText("/broken_config.yml")
+        assertNotNull(brokenConfigData)
+        configFile.writeText(brokenConfigData)
+        assertTrue(config.load().isSuccess)
+        assertTrue(config.save().isSuccess)
+        val brokenConfigFile = configFile.parentFile.listFiles({ _, fileName -> fileName.startsWith("config.yml.broken") })
+        assertNotNull(brokenConfigFile)
+        assertEquals(1, brokenConfigFile.size)
+        assertConfigEquals("/fresh_config.yml", "config.yml")
+    }
 }

src/test/resources/broken_config.yml

@@ -0,0 +1,38 @@
+world:
+  enforce-access: false
+  enforce-gamemode: true
+  auto-purge-entities: false
+
+teleport:
+  use-finer-teleport-permissions: true
+  concurrent-teleport-limit: 50
+  teleport-intercept: true
+
+spawn:
+  first-spawn-override: true
+  first-spawn-location: ''
+  enable-join-destination: false
+  join-destination: ''
+
+portal:
+  use-custom-portal-search: false
+  custom-portal-search-radius: 128
+
+messaging:
+  enable-chat-prefix: false
+  chat-prefix-format: '[%world%]%chat%'
+  register-papi-hook: true
+  default-locale: en
+  per-player-locale: true
+?!
+command:
+  resolve-alias-name: true
+  confirm-mode: enable
+  use-confirm-otp: true
+
+misc:
+  global-debug: 0
+  silent-start: false
+  show-donation-message: true
+
+version: 5.1