Integrate SubcommandData with CoreCommandBuilder and document it

Also made the sender type nicer in the error message

Chroma-Core/src/main/java/buttondevteam/lib/chat/Command2.java

@@ -224,13 +224,24 @@ public abstract class Command2<TC extends ICommand2<TP>, TP extends Command2Send
 			&& cg.getClass() == sendertype) //The command expects a user of our system
 			params.add(cg);
 		else {
-			sender.sendMessage("§cYou need to be a " + sendertype.getSimpleName() + " to use this command.");
+			String type = sendertype.getSimpleName().chars().mapToObj(ch -> Character.isUpperCase(ch)
+				? " " + Character.toLowerCase(ch)
+				: ch + "").collect(Collectors.joining());
+			sender.sendMessage("§cYou need to be a " + type + " to use this command.");
 			sender.sendMessage(sd.getHelpText(sender)); //Send what the command is about, could be useful for commands like /member where some subcommands aren't player-only
 			return true;
 		}
 		return false;
 	}
 
+	/**
+	 * Constructs a command node for the given subcommand that can be used for a custom registering logic (Discord).
+	 *
+	 * @param command The command object
+	 * @param method  The subcommand method
+	 * @return The processed command node
+	 * @throws Exception Something broke
+	 */
 	protected LiteralCommandNode<TP> processSubcommand(TC command, Method method) throws Exception {
 		val params = new ArrayList<Object>(method.getParameterCount());
 		Class<?>[] parameterTypes = method.getParameterTypes();

Chroma-Core/src/main/java/buttondevteam/lib/chat/CoreCommandBuilder.java

@@ -1,32 +1,59 @@
 package buttondevteam.lib.chat;
 
+import buttondevteam.lib.chat.commands.CommandArgument;
+import buttondevteam.lib.chat.commands.SubcommandData;
 import com.mojang.brigadier.builder.LiteralArgumentBuilder;
 import com.mojang.brigadier.tree.CommandNode;
 
-public class CoreCommandBuilder<S> extends LiteralArgumentBuilder<S> {
-	private String[] helpText;
+import java.util.Map;
+import java.util.function.Function;
 
-	protected CoreCommandBuilder(String literal) {
+public class CoreCommandBuilder<S, TC extends ICommand2<?>> extends LiteralArgumentBuilder<S> {
+	private final SubcommandData.SubcommandDataBuilder<TC> dataBuilder;
+
+	protected CoreCommandBuilder(String literal, Class<?> senderType, Map<String, CommandArgument> arguments, TC command) {
 		super(literal);
+		dataBuilder = SubcommandData.<TC>builder().senderType(senderType).arguments(arguments).command(command);
 	}
 
 	@Override
-	protected CoreCommandBuilder<S> getThis() {
+	protected CoreCommandBuilder<S, TC> getThis() {
 		return this;
 	}
 
-	public static <S> CoreCommandBuilder<S> literal(String name) {
-		return new CoreCommandBuilder<>(name);
+	public static <S, TC extends ICommand2<?>> CoreCommandBuilder<S, TC> literal(String name, Class<?> senderType, Map<String, CommandArgument> arguments, TC command) {
+		return new CoreCommandBuilder<>(name, senderType, arguments, command);
 	}
 
-	public CoreCommandBuilder<S> helps(String[] helpText) {
-		this.helpText = helpText;
+	/**
+	 * Static help text added through annotations. May be overwritten with the getter.
+	 *
+	 * @param helpText Help text shown to the user
+	 * @return This instance
+	 */
+	public CoreCommandBuilder<S, TC> helps(String[] helpText) {
+		dataBuilder.staticHelpText(helpText);
+		return this;
+	}
+
+	/**
+	 * Custom help text that depends on the context. Overwrites the static one.
+	 * The function receives the sender but its type is not guaranteed to match the one at the subcommand.
+	 * It will either match or be a Command2Sender, however.
+	 *
+	 * @param getter The getter function receiving the sender and returning the help text
+	 * @return This instance
+	 */
+	public CoreCommandBuilder<S, TC> helps(Function<Object, String[]> getter) {
+		dataBuilder.helpTextGetter(getter);
 		return this;
 	}
 
 	@Override
-	public CoreCommandNode<S> build() {
-		var result = new CoreCommandNode<>(this.getLiteral(), this.getCommand(), this.getRequirement(), this.getRedirect(), this.getRedirectModifier(), this.isFork(), helpText);
+	public CoreCommandNode<S, TC> build() {
+		var result = new CoreCommandNode<>(this.getLiteral(), this.getCommand(), this.getRequirement(),
+			this.getRedirect(), this.getRedirectModifier(), this.isFork(),
+			dataBuilder.build());
 
 		for (CommandNode<S> node : this.getArguments()) {
 			result.addChild(node);

Chroma-Core/src/main/java/buttondevteam/lib/chat/CoreCommandNode.java

@@ -1,5 +1,6 @@
 package buttondevteam.lib.chat;
 
+import buttondevteam.lib.chat.commands.SubcommandData;
 import com.mojang.brigadier.Command;
 import com.mojang.brigadier.RedirectModifier;
 import com.mojang.brigadier.tree.CommandNode;
@@ -8,12 +9,12 @@ import lombok.Getter;
 
 import java.util.function.Predicate;
 
-public class CoreCommandNode<T> extends LiteralCommandNode<T> {
+public class CoreCommandNode<T, TC extends ICommand2<?>> extends LiteralCommandNode<T> {
 	@Getter
-	private final String[] helpText;
+	private final SubcommandData<TC> data;
 
-	public CoreCommandNode(String literal, Command<T> command, Predicate<T> requirement, CommandNode<T> redirect, RedirectModifier<T> modifier, boolean forks, String[] helpText) {
+	public CoreCommandNode(String literal, Command<T> command, Predicate<T> requirement, CommandNode<T> redirect, RedirectModifier<T> modifier, boolean forks, SubcommandData<TC> data) {
 		super(literal, command, requirement, redirect, modifier, forks);
-		this.helpText = helpText;
+		this.data = data;
 	}
 }

Chroma-Core/src/main/java/buttondevteam/lib/chat/commands/SubcommandData.java

@@ -1,16 +1,34 @@
 package buttondevteam.lib.chat.commands;
 
 import buttondevteam.lib.chat.ICommand2;
+import lombok.Builder;
 import lombok.RequiredArgsConstructor;
 
 import java.util.Map;
 import java.util.function.Function;
 
+/**
+ * Stores information about the subcommand that can be used to construct the Brigadier setup and to get information while executing the command.
+ *
+ * @param <TC> Command class type
+ */
+@Builder
 @RequiredArgsConstructor
 public final class SubcommandData<TC extends ICommand2<?>> {
-	// The actual sender type may not be represented by Command2Sender (TP)
+	/**
+	 * The type of the sender running the command.
+	 * The actual sender type may not be represented by Command2Sender (TP).
+	 * In that case it has to match the expected type.
+	 */
 	public final Class<?> senderType;
+	/**
+	 * Command arguments collected from the subcommand method.
+	 * Used to construct the arguments for Brigadier and to hold extra information.
+	 */
 	public final Map<String, CommandArgument> arguments;
+	/**
+	 * The original command class that this data belongs to.
+	 */
 	public final TC command;
 
 	/**
@@ -24,6 +42,12 @@ public final class SubcommandData<TC extends ICommand2<?>> {
 	 */
 	private final Function<Object, String[]> helpTextGetter;
 
+	/**
+	 * Get help text for this subcommand.
+	 *
+	 * @param sender The sender running the command
+	 * @return Help text shown to the user
+	 */
 	public String[] getHelpText(Object sender) {
 		return staticHelpText == null ? helpTextGetter.apply(sender) : staticHelpText;
 	}