Application Commands

What is an application command?

Application commands are commands that an application can register to Discord. They provide users a first-class way of interacting directly with your application that feels deeply integrated into Discord.

From: Discord API docs

How do I register an application command?

Write to your script: - Discorb::ApplicationCommand::Handler#slash, Discorb::ApplicationCommand::Handler#slash_group for slash commands, - Discorb::ApplicationCommand::Handler#user_command for user menu commands, - Discorb::ApplicationCommand::Handler#message_command for message menu commands.

And then run discorb setup to register your application commands. Learn more about discorb setup.

Note

To register a global command, it will take 1 hour to be registered. Guild commands will be registered immediately.

Register Slash Commands

This example registers a slash command that says “Hello, world!” when the user types /hello.

require "discorb"

client = Discorb::Client.new

client.slash("hello", "Greet for you") do |interaction|
  interaction.post("Hello World!", ephemeral: true)
end

client.run(ENV["DISCORD_BOT_TOKEN"])

Discorb::ApplicationCommand::Handler#slash takes 5 arguments:

Argument	Description
`command_name`	The name of the command.
`description`	The description of the command.
`options`	A hash of options.
`guild_ids`	The ID of the guild to register the command in.
`block`	A block that will be called when the command is invoked.

Block will be called with a Discorb::Interaction object and specified options.

In options, hash should be like this:

{
  "Name" => {
    type: :string,
    required: true,
    description: "The description of the command."
  }
}

| Key | Type | Description | | — | — | — | | :description | String | Description of the option. | | :required | Whether the argument is required. optional will be used if not specified. | | :optional | Whether the argument is optional. required will be used if not specified. | | :type | Object | Type of the option. | | :choice | Hash{String => String, Integer, Float} | Choice of the option. | | :default | Object | Default value of the option. | | :channel_types | Array<Class<Discorb::Channel>> | Type of the channel option. | | :autocomplete | Proc | Autocomplete function. | | :range | Range | Range of the option. Only valid for numeric options. (:int, :float) |

choices should be unspecified if you don't want to use it. choices is hash like this:

{
  "vocaloid" => {
    required: true,
    description: "The vocaloid which you like.",
    type: :string,
    choices: {
      "Hatsune Miku" => "miku",
      "Kagamine Rin" => "rin",
      "Kagamine Len" => "len",
      "Megurine Luka" => "luka",
      "MEIKO" => "meiko",
      "KAITO" => "kaito",
    }
  }
}

# Note: This aritcle is written in 8/31.

The key will be displayed in the user menu, and the value will be used as the argument.

In type, You must use one of the following:

Group Slash Commands

To register a group of slash commands, use Discorb::ApplicationCommand::Handler#slash_group.

group = client.slash_group("settings", "Set settings of bot.")

group.slash("message_expand", "Whether bot should expand message.", {
  "enabled" => {
    type: :boolean,
    description: "Whether bot should expand message."
  }
}) do |interaction, enabled|
  # ...
end

group.slash("level", "Whether level system is enabled.", {
  "enabled" => {
    type: :boolean,
    description: "Whether level system is enabled."
  }
}) do |interaction, enabled|
  # ...
end

Since v0.5.1, You can use block for register commands.


client.slash_group("settings", "Set settings of bot.") do |group|
  group.slash("message_expand", "Whether bot should expand message.", {
    "enabled" => {
      type: :boolean,
      description: "Whether bot should expand message."
    }
  }) do |interaction, enabled|
    # ...
  end
  group.slash("bump_alert", "Whether level system is enabled.", {
    "enabled" => {
      type: :boolean,
      description: "Whether level system is enabled."
    }
  }) do |interaction, enabled|
    # ...
  end
end

You can make subcommand group by using Discorb::ApplicationCommand::Command::GroupCommand#group.

group = client.slash_group("permission", "Set/Get command permissions.")

group_user = group.group("user", "Set/Get user's command permissions.")

group_user.slash("set", "Set user's command permissions.", {
  "user_id" => {
      type: :user,
      description: "The user."
  },
  "value" => {
      type: :boolean,
      description: "Whether the user can use the command."
  }
}) do |interaction, user|
  # ...
end

group_user.slash("get", "Set user's command permissions.", {
    "user_id" => {
        type: :user,
        description: "The user."
    },
}) do |interaction, user|
  # ...
end

group_user = group.group("user", "Set/Get user's command permissions.")

group_user.slash("set", "Set user's command permissions.", {
    "user_id" => {
        type: :user,
        description: "The user."
    },
    "value" => {
        type: :boolean,
        description: "Whether the user can use the command."
    }
}) do |interaction, user|
  # ...
end

group_user.slash("get", "Set user's command permissions.", {
    "user_id" => {
        type: :user,
        description: "The user."
    },
}) do |interaction, user|
  # ...
end

group_role = group.group("role", "Set/Get role's command permissions.")

group_role.slash("set", "Set role's command permissions.", {
    "role_id" => {
        type: :role,
        description: "The role."
    },
    "value" => {
        type: :boolean,
        description: "Whether the role can use the command."
    }
}) do |interaction, role|
  # ...
end

group_role.slash("get", "Set role's command permissions.", {
    "role_id" => {
        type: :role,
        description: "The role."
    },
}) do |interaction, role|
  # ...
end

Same as above, you can use block for register commands since v0.5.1.

Use Auto Completing

Since v0.11.0, you can use auto-completion by setting Proc to :autocomplete in options. The proc will be called with interaction object and the argument. The proc should return a hash of the autocomplete result.

client.slash("hello2", "Greet for you", {
  "target" => {
    type: :string,
    description: "Person to greet",
    autocomplete: ->(interaction, target) {
      {
        "You" => interaction.target.to_s
      }
    },
  },
}) do |interaction, target|
  interaction.post("Hello, #{target}!")
end

In the above example, You will be displayed in the user menu. Due to the limitation of Discord API, the proc must return the result in less than 3 second.

client.user_command("hello") do |interaction, user|
  interaction.post("Hello, #{user.name}!")
end

Discorb::ApplicationCommand::Handler#user_command takes 3 arguments:

block will be called with two arguments:

client.message_command("Bookmark") do |interaction, message|
  # ...
end

Discorb::ApplicationCommand::Handler#message_command takes 3 arguments: