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.

Register options

You can set hash to options argument. In options, hash should be like this:

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

Key	Type	Description
`:name_localizations`	`Hash{Symbol => String}`	Localizations of option name.
`:description`	`String`	Description of the option.
`:required`	`Boolean(true\	false)`
`:optional`	`Boolean(true\	false)`
`:type`	`Object`	Type of the option.
`:choices`	`Hash{String => String, Integer, Float}`	Choice of the option.
`:choices_localizations`	`Hash{String => Hash{Symbol => String}}`	Localization of the choice. Key must be the name of a choice. (See below for example)
`: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`)
`:length`	`Range`	Range of length of the option. Only valid for `:string`.

choices should be unspecified if you don't want to use it. choices example:

{
  "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:

Name	Description	Aliases
`:string`	String argument.	`:str`
`:integer`	Integer argument.	`:int`
`:float`	Float argument.	None
`:boolean`	Boolean argument.	`:bool`
`:user`	User argument.	`:member`
`:channel`	Channel argument.	None
`:role`	Role argument.	None

The block will receive the options as arguments.

client.slash("hello", "Bot greets", {
  "name" => {
    type: :string,
    description: "Name"
  }
}) do |interaction, name|
  interaction.post("Hello, #{name}!", ephemeral: true)
end

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:

Parameter	Description
`command_name`	The name of the command.
`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 two arguments:

Parameter	Description
`interaction`	The interaction object.
`user`	The user object.

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

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

Parameter	Description
`command_name`	The name of the command.
`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 two arguments:

Parameter	Description
`interaction`	The interaction object.
`message`	The message object.

Localizing command

You can localize commands with passing parameters, or setting Hash to name. Also, you can change the text by checking interaction.locale and interaction.guild_locale.

Command name localize example:

localizations = {
  localized: {
    text: {
      en: "Hello, %s!",
      ja: "%sさん、こんにちは！",
    },
  },
}

client.slash({
  default: "greet",
  ja: "挨拶",
}, {
  default: "Bot greets. Cute OwO",
  ja: "Botが挨拶します。かわいいね",
}, {
  "name" => {
    name_localizations: {
      ja: "名前",
    },
    description: {
      default: "The name to greet.",
      ja: "挨拶する人の名前。",
    },
    type: :string,
    optional: true,
  },
}) do |interaction, name|
  interaction.post(
    (localizations[:localized][:text][interaction.locale] || localizations[:localized][:text][:en]) % [name || interaction.target.to_s_user],
    ephemeral: true,
  )
end

Option localize example:

{
  "vocaloid" => {
    name_localizations: {
      ja: "ボカロ",
    },
    required: true,
    description: "The vocaloid which you like.",
    description_localizations: {
      ja: "好きなボカロ。",
    },
    type: :string,
    choices: {
      "Hatsune Miku" => "miku",
      "Kagamine Rin" => "rin",
      "Kagamine Len" => "len",
      "Megurine Luka" => "luka",
      "MEIKO" => "meiko",
      "KAITO" => "kaito",
    },
    choice_localizations: {
      "Hatsune Miku" => {
        ja: "初音ミク",
      },
      "Kagamine Rin" => {
        ja: "鏡音リン",
      },
      "Kagamine Len" => {
        ja: "鏡音レン",
      },
      "Megurine Luka" => {
        ja: "巡音ルカ",
      },
      "MEIKO" => {
        ja: "MEIKO",
      },
      "KAITO" => {
        ja: "KAITO",
      },
    }
  }
}