Better error handling of world folder deletion

src/main/java/com/onarandombox/MultiverseCore/utils/MVCorei18n.java

@@ -101,6 +101,7 @@ public enum MVCorei18n implements MessageKeyProvider {
 
     DELETEWORLD_DELETED,
     DELETEWORLD_WORLDNONEXISTENT,
+    DELETEWORLD_LOADFAILED,
     DELETEWORLD_WORLDFOLDERNOTFOUND,
     DELETEWORLD_FAILEDTODELETEFOLDER,
 

src/main/java/com/onarandombox/MultiverseCore/worldnew/WorldManager.java

@@ -10,6 +10,7 @@ import com.onarandombox.MultiverseCore.utils.result.Result;
 import com.onarandombox.MultiverseCore.worldnew.config.WorldConfig;
 import com.onarandombox.MultiverseCore.worldnew.config.WorldsConfigManager;
 import com.onarandombox.MultiverseCore.worldnew.generators.GeneratorProvider;
+import com.onarandombox.MultiverseCore.worldnew.helpers.FilesManipulator;
 import com.onarandombox.MultiverseCore.worldnew.options.CreateWorldOptions;
 import com.onarandombox.MultiverseCore.worldnew.options.ImportWorldOptions;
 import com.onarandombox.MultiverseCore.worldnew.results.CreateWorldResult;
@@ -52,6 +53,7 @@ public class WorldManager {
     private final WorldsConfigManager worldsConfigManager;
     private final WorldNameChecker worldNameChecker;
     private final GeneratorProvider generatorProvider;
+    private final FilesManipulator filesManipulator;
     private final BlockSafety blockSafety;
     private final SafeTTeleporter safeTTeleporter;
     private final LocationManipulation locationManipulation;
@@ -61,6 +63,7 @@ public class WorldManager {
             @NotNull WorldsConfigManager worldsConfigManager,
             @NotNull WorldNameChecker worldNameChecker,
             @NotNull GeneratorProvider generatorProvider,
+            @NotNull FilesManipulator filesManipulator,
             @NotNull BlockSafety blockSafety,
             @NotNull SafeTTeleporter safeTTeleporter,
             @NotNull LocationManipulation locationManipulation
@@ -73,6 +76,7 @@ public class WorldManager {
         this.worldsConfigManager = worldsConfigManager;
         this.worldNameChecker = worldNameChecker;
         this.generatorProvider = generatorProvider;
+        this.filesManipulator = filesManipulator;
         this.blockSafety = blockSafety;
         this.safeTTeleporter = safeTTeleporter;
         this.locationManipulation = locationManipulation;
@@ -396,18 +400,38 @@ public class WorldManager {
     }
 
     /**
-     * Deletes an existing multiverse world entirely. Warning: This will delete all world files.
+     * Deletes an existing multiverse world entirely. World will be loaded if it is not already loaded.
+     * Warning: This will delete all world files.
      *
      * @param worldName The name of the world to delete.
      * @return The result of the delete action.
      */
     public Result<DeleteWorldResult.Success, DeleteWorldResult.Failure> deleteWorld(@NotNull String worldName) {
-        // TODO: Attempt to load offline world
-        return getMVWorld(worldName)
+        return getOfflineWorld(worldName)
                 .map(this::deleteWorld)
                 .getOrElse(() -> Result.failure(DeleteWorldResult.Failure.WORLD_NON_EXISTENT, replace("{world}").with(worldName)));
     }
 
+    /**
+     * Deletes an existing multiverse world entirely. World will be loaded if it is not already loaded.
+     * Warning: This will delete all world files.
+     *
+     * @param world The offline world to delete.
+     * @return The result of the delete action.
+     */
+    public Result<DeleteWorldResult.Success, DeleteWorldResult.Failure> deleteWorld(@NotNull OfflineWorld world) {
+        return getMVWorld(world).fold(
+                () -> {
+                    var result = loadWorld(world);
+                    if (result.isFailure()) {
+                        return Result.failure(DeleteWorldResult.Failure.LOAD_FAILED, replace("{world}").with(world.getName()));
+                    }
+                    return deleteWorld(world);
+                },
+                this::deleteWorld
+        );
+    }
+
     /**
      * Deletes an existing multiverse world entirely. Warning: This will delete all world files.
      *
@@ -427,13 +451,14 @@ public class WorldManager {
         }
 
         // Erase world files from disk
-        // TODO: Config options to keep certain files
-        if (!FileUtils.deleteFolder(worldFolder)) {
-            Logging.severe("Failed to delete world folder: " + worldFolder);
-            return Result.failure(DeleteWorldResult.Failure.FAILED_TO_DELETE_FOLDER, replace("{world}").with(world.getName()));
-        }
-
-        return Result.success(DeleteWorldResult.Success.DELETED, replace("{world}").with(world.getName()));
+        // TODO: Possible config options to keep certain files
+        return filesManipulator.deleteFolder(worldFolder).fold(
+                (exception) -> Result.failure(DeleteWorldResult.Failure.FAILED_TO_DELETE_FOLDER,
+                        replace("{world}").with(world.getName()),
+                        replace("{error}").with(exception.getMessage())
+                ),
+                (success) -> Result.success(DeleteWorldResult.Success.DELETED, replace("{world}").with(world.getName()))
+        );
     }
 
     /**

src/main/java/com/onarandombox/MultiverseCore/worldnew/helpers/FilesManipulator.java

@@ -0,0 +1,31 @@
+package com.onarandombox.MultiverseCore.worldnew.helpers;
+
+import com.dumptruckman.minecraft.util.Logging;
+import io.vavr.control.Try;
+import org.jvnet.hk2.annotations.Service;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Comparator;
+import java.util.stream.Stream;
+
+@Service
+public class FilesManipulator {
+
+    public Try<Void> deleteFolder(File file) {
+        return deleteFolder(file.toPath());
+    }
+
+    public Try<Void> deleteFolder(Path path) {
+        try (Stream<Path> files = Files.walk(path)) {
+            files.sorted(Comparator.reverseOrder()).map(Path::toFile).forEach(File::delete);
+            return Try.success(null);
+        } catch (IOException e) {
+            Logging.severe("Failed to delete folder: " + path.toAbsolutePath());
+            e.printStackTrace();
+            return Try.failure(e);
+        }
+    }
+}

src/main/java/com/onarandombox/MultiverseCore/worldnew/results/DeleteWorldResult.java

@@ -25,6 +25,7 @@ public class DeleteWorldResult {
 
     public enum Failure implements FailureReason {
         WORLD_NON_EXISTENT(MVCorei18n.DELETEWORLD_WORLDNONEXISTENT),
+        LOAD_FAILED(MVCorei18n.DELETEWORLD_LOADFAILED),
         WORLD_FOLDER_NOT_FOUND(MVCorei18n.DELETEWORLD_WORLDFOLDERNOTFOUND),
         REMOVE_FAILED(null),
         FAILED_TO_DELETE_FOLDER(MVCorei18n.DELETEWORLD_FAILEDTODELETEFOLDER),

src/main/resources/multiverse-core_en.properties

@@ -137,8 +137,9 @@ mv-core.createworld.bukkitcreationfailed=Bukkit failed to create world '{world}'
 
 mv-core.deleteworld.deleted=&aWorld '{world}' deleted!
 mv-core.deleteworld.worldnonexistent=World '{world}' not found!
+mv-core.deleteworld.loadfailed=Unable to load world '{world}', does the world folder exist?&f You can run '&a/mv remove {world}&f' to remove it from Multiverse, or attempt to load again with '&a/mv load {world}&f'.
 mv-core.deleteworld.worldfoldernotfound=World '{world}' folder not found!
-mv-core.deleteworld.failedtodeletefolder=Failed to delete world '{world}' folder!& fSee console for more details.
+mv-core.deleteworld.failedtodeletefolder=Failed to delete world folder '{world}': {error}\n&fSee console for more details.
 
 mv-core.importworld.imported=&aWorld '{world}' imported!
 mv-core.importworld.invalidworldname=World '{world}' contains invalid characters!