Minor bug fixes

worldedit-core/src/main/java/com/sk89q/worldedit/command/ApplyBrushCommands.java

@@ -84,6 +84,7 @@ public class ApplyBrushCommands {
             builder.addParts(REGION_FACTORY, RADIUS);
             builder.addPart(SubCommandPart.builder(TranslatableComponent.of("type"), TextComponent.of("Type of brush to use"))
                 .withCommands(manager.getAllCommands().collect(Collectors.toList()))
+                .required()
                 .build());
         });
     }

worldedit-core/src/main/java/com/sk89q/worldedit/command/PaintBrushCommands.java

@@ -89,6 +89,7 @@ public class PaintBrushCommands {
             builder.addParts(REGION_FACTORY, RADIUS, DENSITY);
             builder.addPart(SubCommandPart.builder(TranslatableComponent.of("type"), TextComponent.of("Type of brush to use"))
                 .withCommands(manager.getAllCommands().collect(Collectors.toList()))
+                .required()
                 .build());
         });
     }

worldedit-core/src/main/java/com/sk89q/worldedit/command/argument/FactoryConverter.java

@@ -36,6 +36,7 @@ import com.sk89q.worldedit.world.World;
 import org.enginehub.piston.CommandManager;
 import org.enginehub.piston.converter.ArgumentConverter;
 import org.enginehub.piston.converter.ConversionResult;
+import org.enginehub.piston.converter.FailedConversion;
 import org.enginehub.piston.converter.SuccessfulConversion;
 import org.enginehub.piston.inject.InjectedValueAccess;
 import org.enginehub.piston.inject.Key;
@@ -86,7 +87,7 @@ public class FactoryConverter<T> implements ArgumentConverter<T> {
                 factoryExtractor.apply(worldEdit).parseFromInput(argument, parserContext)
             );
         } catch (InputParseException e) {
-            throw new IllegalArgumentException(e);
+            return FailedConversion.from(e);
         }
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/extension/platform/PlatformCommandManager.java

@@ -256,6 +256,7 @@ public final class PlatformCommandManager {
                 registration,
                 instance
             );
+            additionalConfig.accept(manager);
 
             cmd.addPart(SubCommandPart.builder(TranslatableComponent.of("worldedit.argument.action"),
                 TextComponent.of("Sub-command to run."))
@@ -443,7 +444,7 @@ public final class PlatformCommandManager {
         Request.reset();
 
         Actor actor = platformManager.createProxyActor(event.getActor());
-        String[] split = commandDetection(event.getArguments().split(" "));
+        String[] split = commandDetection(event.getArguments().substring(1).split(" "));
 
         // No command found!
         if (!commandManager.containsCommand(split[0])) {
@@ -511,7 +512,7 @@ public final class PlatformCommandManager {
                 actor.print(TextComponent.builder("Usage: ")
                     .color(TextColor.RED)
                     .append(TextComponent.of("/", ColorConfig.getMainText()))
-                    .append(HelpGenerator.create(cmd).getUsage())
+                    .append(HelpGenerator.create(e.getCommandParseResult()).getUsage())
                     .build());
             }
         } catch (CommandExecutionException e) {

worldedit-core/src/main/java/com/sk89q/worldedit/internal/command/WorldEditExceptionConverter.java

@@ -19,8 +19,6 @@
 
 package com.sk89q.worldedit.internal.command;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 import com.google.common.collect.ImmutableList;
 import com.sk89q.worldedit.DisallowedItemException;
 import com.sk89q.worldedit.EmptyClipboardException;
@@ -35,7 +33,6 @@ import com.sk89q.worldedit.WorldEdit;
 import com.sk89q.worldedit.WorldEditException;
 import com.sk89q.worldedit.command.InsufficientArgumentsException;
 import com.sk89q.worldedit.command.tool.InvalidToolBindException;
-import com.sk89q.worldedit.command.util.PermissionCondition;
 import com.sk89q.worldedit.internal.expression.ExpressionException;
 import com.sk89q.worldedit.regions.RegionOperationException;
 import com.sk89q.worldedit.util.command.parametric.ExceptionConverterHelper;
@@ -45,11 +42,13 @@ import com.sk89q.worldedit.util.io.file.FileSelectionAbortedException;
 import com.sk89q.worldedit.util.io.file.FilenameResolutionException;
 import com.sk89q.worldedit.util.io.file.InvalidFilenameException;
 import org.enginehub.piston.exception.CommandException;
-import org.enginehub.piston.exception.ConditionFailedException;
+import org.enginehub.piston.exception.UsageException;
 
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import static com.google.common.base.Preconditions.checkNotNull;
+
 /**
  * converts WorldEdit exceptions and converts them into {@link CommandException}s.
  */
@@ -173,4 +172,10 @@ public class WorldEditExceptionConverter extends ExceptionConverterHelper {
         throw newCommandException(e.getMessage(), e);
     }
 
+    // Prevent investigation into UsageExceptions
+    @ExceptionMatch
+    public void convert(UsageException e) throws CommandException {
+        throw e;
+    }
+
 }

worldedit-core/src/main/java/com/sk89q/worldedit/util/command/parametric/ExceptionConverterHelper.java

@@ -19,6 +19,7 @@
 
 package com.sk89q.worldedit.util.command.parametric;
 
+import com.google.common.collect.ImmutableList;
 import com.sk89q.minecraft.util.commands.WrappedCommandException;
 import org.enginehub.piston.exception.CommandException;
 import org.enginehub.piston.exception.CommandExecutionException;
@@ -32,24 +33,24 @@ import java.util.List;
 /**
  * An implementation of an {@link ExceptionConverter} that automatically calls
  * the correct method defined on this object.
- * 
+ *
  * <p>Only public methods will be used. Methods will be called in order of decreasing
  * levels of inheritance (between classes where one inherits the other). For two
  * different inheritance branches, the order between them is undefined.</p>
  */
 public abstract class ExceptionConverterHelper implements ExceptionConverter {
-    
+
     private final List<ExceptionHandler> handlers;
 
     @SuppressWarnings("unchecked")
     public ExceptionConverterHelper() {
         List<ExceptionHandler> handlers = new ArrayList<>();
-        
+
         for (Method method : this.getClass().getMethods()) {
             if (method.getAnnotation(ExceptionMatch.class) == null) {
                 continue;
             }
-            
+
             Class<?>[] parameters = method.getParameterTypes();
             if (parameters.length == 1) {
                 Class<?> cls = parameters[0];
@@ -59,9 +60,9 @@ public abstract class ExceptionConverterHelper implements ExceptionConverter {
                 }
             }
         }
-        
+
         Collections.sort(handlers);
-        
+
         this.handlers = handlers;
     }
 
@@ -76,18 +77,18 @@ public abstract class ExceptionConverterHelper implements ExceptionConverter {
                     if (e.getCause() instanceof CommandException) {
                         throw (CommandException) e.getCause();
                     }
-                    throw new CommandExecutionException(e, null);
+                    throw new CommandExecutionException(e, ImmutableList.of());
                 } catch (IllegalArgumentException | IllegalAccessException e) {
-                    throw new CommandExecutionException(e, null);
+                    throw new CommandExecutionException(e, ImmutableList.of());
                 }
             }
         }
     }
-    
+
     private static class ExceptionHandler implements Comparable<ExceptionHandler> {
         final Class<? extends Throwable> cls;
         final Method method;
-        
+
         private ExceptionHandler(Class<? extends Throwable> cls, Method method) {
             this.cls = cls;
             this.method = method;