feat(commands): add help command

Introduces command documentation. Can display all the available commands or detailed way of using a specific command

src/commands/miscellaneous/help.ts

@@ -0,0 +1,77 @@
+import type { CommandContext } from '@/types'
+import type { Blop } from '@/structures'
+import type { APIEmbed } from 'discord.js'
+
+import { Command } from '@/structures'
+
+export default class Help extends Command {
+  constructor(client: Blop) {
+    super(client, {
+      _filename: import.meta.url,
+      name: 'help',
+      description: () => 'Displays all the available commands.',
+      options: [
+        {
+          name: 'command',
+          description: 'Display information about a specific command',
+          type: 3
+        }
+      ]
+    })
+  }
+
+  execute({ client, interaction }: CommandContext) {
+    const commandArg = interaction.options.getString('command')
+    if (commandArg) {
+      const command = client.commands.find((module) => module.name === commandArg.toLowerCase())
+
+      if (!command) return 'Command not found.'
+
+      return {
+        embeds: [
+          {
+            author: {
+              name: `Command Documentation: ${command.name}`,
+              icon_url: client.user.displayAvatarURL()
+            },
+            color: 7154431,
+            description: command.description({ client })
+          }
+        ]
+      }
+    }
+
+    const embed: APIEmbed = {
+      author: {
+        name: `${client.user.username} Documentation`,
+        icon_url: client.user.displayAvatarURL()
+      },
+      color: 7154431,
+      description: 'To get more details about how to use commands, do `/help <command>`.',
+      fields: [],
+      footer: {
+        text: '<> means required command parameter | [] means optional command parameter'
+      }
+    }
+
+    const categories: string[] = []
+
+    client.commands.forEach((command) => {
+      if (!categories.includes(command.category)) {
+        categories.push(command.category)
+      }
+    })
+
+    categories.forEach((category) => {
+      const commands = client.commands.filter((module) => module.category === category)
+      if (commands.length < 1) return
+
+      embed.fields!.push({
+        name: category,
+        value: `\`${commands.map((command) => command.name).join('`, `')}\``
+      })
+    })
+
+    return { embeds: [embed] }
+  }
+}