refactor: Use arguments for default help command.

src/defaults/commands/HelpCommand.ts

@@ -1,7 +1,7 @@
 import dayjs from 'dayjs';
 import durationPlugin from 'dayjs/plugin/duration';
 import {BetterEmbed} from 'discord.js-better-embed';
-import {CommandHandler} from '../../';
+import {commandArgument, CommandHandler} from '../../';
 import {Command, CommandContext, Tag} from '../../classes';
 
 dayjs.extend(durationPlugin);
@@ -26,13 +26,17 @@ function groupBy<T, K extends keyof any>(array: T[], predicate: (item: T) => K):
 
 export class HelpCommand extends Command {
 	override aliases = ['h'];
+	override arguments = {
+		command: commandArgument({optional: true}),
+	};
 	override category = 'utils';
 	override description = 'Get the list of commands or more information for one.';
 	override name = 'help';
-	override usage = 'help\nhelp <command>';
 
 	public override async run(ctx: CommandContext) {
-		if (!ctx.isCallingASubCommand) await HelpCommand.sendGlobalHelp(ctx);
+		const command = await ctx.argument<Command>('command');
+		if (command) await HelpCommand.sendCommandHelp(ctx, command);
+		else await HelpCommand.sendGlobalHelp(ctx);
 	}
 
 	public static async sendGlobalHelp(ctx: CommandContext) {
@@ -76,14 +80,7 @@ export class HelpCommand extends Command {
 		});
 
 		if (command.usage) embed.addField('Usage :', command.usage);
-		else
-			embed.addField(
-				'Syntax :',
-				command.signatures({
-					showDefaultValues: true,
-					showTypes: true,
-				})
-			);
+		else embed.addField('Syntax :', command.signatures({showDefaultValues: true}));
 		if (command.aliases) embed.addField('Aliases : ', `\`${command.aliases.sort().join('\n')}\``);
 		if (command.tags)
 			embed.addField(
@@ -117,11 +114,5 @@ export class HelpCommand extends Command {
 			},
 			HelpCommand.sendGlobalHelp
 		);
-
-		CommandHandler.commands.forEach(c => {
-			this.subCommand(c.name, {aliases: c.aliases}, async ctx => {
-				await HelpCommand.sendCommandHelp(ctx, c);
-			});
-		});
 	}
 }