Allow command managers to provide default command meta instances

cloud-bukkit/src/main/java/com/intellectualsites/commands/BukkitCommandManager.java

@@ -63,4 +63,10 @@ public class BukkitCommandManager extends CommandManager<BukkitCommandSender, Bu
         return this.owningPlugin;
     }
 
+    @Nonnull
+    @Override
+    public BukkitCommandMeta createDefaultCommandMeta() {
+        return BukkitCommandMetaBuilder.builder().withDescription("").build();
+    }
+
 }

cloud-core/src/main/java/com/intellectualsites/commands/CommandManager.java

@@ -57,8 +57,9 @@ public abstract class CommandManager<C extends CommandSender, M extends CommandM
 
     private CommandSyntaxFormatter<C> commandSyntaxFormatter = new StandardCommandSyntaxFormatter<>();
 
-    public CommandManager(@Nonnull final Function<CommandTree<C, M>, CommandExecutionCoordinator<C, M>> commandExecutionCoordinator,
+    public CommandManager(
-                             @Nonnull final CommandRegistrationHandler<M> commandRegistrationHandler) {
+            @Nonnull final Function<CommandTree<C, M>, CommandExecutionCoordinator<C, M>> commandExecutionCoordinator,
+            @Nonnull final CommandRegistrationHandler<M> commandRegistrationHandler) {
         this.commandTree = CommandTree.newTree(this, commandRegistrationHandler);
         this.commandExecutionCoordinator = commandExecutionCoordinator.apply(commandTree);
         this.commandRegistrationHandler = commandRegistrationHandler;
@@ -73,7 +74,8 @@ public abstract class CommandManager<C extends CommandSender, M extends CommandM
      */
     @Nonnull
     public CompletableFuture<CommandResult> executeCommand(@Nonnull final C commandSender, @Nonnull final String input) {
-        return this.commandExecutionCoordinator.coordinateExecution(this.commandContextFactory.create(commandSender), tokenize(input));
+        return this.commandExecutionCoordinator.coordinateExecution(this.commandContextFactory.create(commandSender),
+                                                                    tokenize(input));
     }
 
     /**
@@ -135,7 +137,7 @@ public abstract class CommandManager<C extends CommandSender, M extends CommandM
      * @return Command registration handler
      */
     @Nonnull
-    protected CommandRegistrationHandler getCommandRegistrationHandler() {
+    protected CommandRegistrationHandler<M> getCommandRegistrationHandler() {
         return this.commandRegistrationHandler;
     }
 
@@ -151,14 +153,38 @@ public abstract class CommandManager<C extends CommandSender, M extends CommandM
         return Command.newBuilder(name, meta);
     }
 
+    /**
+     * Create a new command builder using a default command meta instance.
+     *
+     * @param name Command name
+     * @return Builder instance
+     * @throws UnsupportedOperationException If the command manager does not support default command meta creation
+     * @see #createDefaultCommandMeta() Default command meta creation
+     */
+    @Nonnull
+    public Command.Builder<C, M> commandBuilder(@Nonnull final String name) {
+        return Command.newBuilder(name, this.createDefaultCommandMeta());
+    }
+
+
     /**
      * Get the internal command tree. This should not be accessed unless you know what you
      * are doing
      *
      * @return Command tree
      */
-    @Nonnull CommandTree<C, M> getCommandTree() {
+    @Nonnull
+    CommandTree<C, M> getCommandTree() {
         return this.commandTree;
     }
 
+    /**
+     * Construct a default command meta instance
+     *
+     * @return Default command meta
+     * @throws UnsupportedOperationException If the command manager does not support this operation
+     */
+    @Nonnull
+    public abstract M createDefaultCommandMeta();
+
 }

cloud-core/src/main/java/com/intellectualsites/commands/meta/CommandMeta.java

@@ -25,9 +25,16 @@ package com.intellectualsites.commands.meta;
 
 import javax.annotation.Nonnull;
 
+/**
+ * Object that is associated with a {@link com.intellectualsites.commands.Command}.
+ * Command meta should not be mutable, as one fixed instance will be used per command.
+ * <p>
+ * Appropriate use for command meta would be fixed state, such as command descriptions.
+ */
 public class CommandMeta {
 
-    @Nonnull public static SimpleCommandMeta.Builder simple() {
+    @Nonnull
+    public static SimpleCommandMeta.Builder simple() {
         return SimpleCommandMeta.builder();
     }
 

cloud-core/src/main/java/com/intellectualsites/commands/meta/SimpleCommandMeta.java

@@ -60,7 +60,6 @@ public class SimpleCommandMeta extends CommandMeta {
         return SimpleCommandMeta.builder().build();
     }
 
-
     /**
      * Get the value associated with a key
      *

cloud-jline/src/main/java/com/intellectualsites/commands/jline/JLineCommandManager.java

@@ -138,4 +138,10 @@ public class JLineCommandManager extends CommandManager<JLineCommandSender, Simp
         System.out.printf("Trying to complete '%s'\n", line);
     }
 
+    @Nonnull
+    @Override
+    public SimpleCommandMeta createDefaultCommandMeta() {
+        return SimpleCommandMeta.empty();
+    }
+
 }