This gem is a collection of IRB Extensions for enhancing IRB with additional commands, helpers, prompts, and more. Add this gem to your IRB configuration (i.e. irbrc) to get all these enhancements immediately while keeping your IRB configuration slim and readable.

Features

  • Provides custom commands and helpers.

  • Provides dynamic prompt based on environment.

Requirements

  1. Ruby.

  2. IRB.

  3. A solid understanding of Interactive Ruby.

Setup

To install with security, run:

# 💡 Skip this line if you already have the public certificate installed.
gem cert --add <(curl --compressed --location https://alchemists.io/gems.pem)
gem install irb-kit --trust-policy HighSecurity

To install without security, run:

gem install irb-kit

You can also add the gem directly to your project:

bundle add irb-kit

Once the gem is installed, you only need to require it:

require "irb/kit"

Usage

To use, add the following to your ~/.config/irb/irbrc configuration (or ~/.irbrc if not using XDG).

begin
  require "irb/kit"
rescue LoadError => error
  puts "ERROR: #{error.message.capitalize}."
end

This ensures this gem is fully loaded in order to enhance IRB further. Otherwise, an error is displayed if you are in a Ruby project that doesn’t have this gem as a dependency. To customize, read on.

Quick Start

If you’d like all the bells and whistles fully enabled, add the following to your IRB configuration (as discussed above):

begin
  require "irb/kit"

  IRB::Kit.register_commands :all
  IRB::Kit.register_helpers :all

  IRB.conf[:PROMPT] ||= {}

  IRB.conf[:PROMPT][:DEMO] = {
    PROMPT_I: "[#{IRB::Kit.prompt}]> ",
    PROMPT_N: "[#{IRB::Kit.prompt}]| ",
    PROMPT_C: "[#{IRB::Kit.prompt}]| ",
    PROMPT_S: "[#{IRB::Kit.prompt}]%l ",
    RETURN: "=> %s\n"
  }

  IRB.conf[:PROMPT_MODE] = :DEMO
rescue LoadError => error
  puts "ERROR: #{error.message.capitalize}."
end

The above enables all commands and helpers and configures your prompt for Ruby, Hanami, and Rails environments.

💡 Use of :DEMO, while functional, is meant to be replaced with the name of your organization or personal identity. So please ensure you replace both occurrences of :DEMO with your own unique identifier.

Commands

Custom command are provided for you by this gem. Each is listed below as found when using help within an IRB console:

Kit
  descendants        Show class descendants.

To enable all of these commands, use IRB::Kit.register_commands :all. This is the same as using:

IRB::Kit.register_commands :descendants

Knowing this, you can disable all commands entirely, use only the ones you care about, or enable all of them at once. The following explains each helper in greater detail.

descendants

Use this command to show all descendants of a class. Example:

descendants IO
# File

descendants Ractor::Error
# Ractor::IsolationError
# Ractor::MovedError
# Ractor::RemoteError
# Ractor::UnsafeError

Helpers

Several custom helpers are provided for you by this gem. Each is listed below as found when using help within an IRB console:

Helper methods
  clip           Copy input to macOS clipboard.
  esource        Edit the source code of a constant or method in your default editor.
  paste          Paste last entry from macOS clipboard.
  search         Search an object's methods by pattern.

To enable all of these helpers, use IRB::Kit.register_helpers :all. This is the same as using:

IRB::Kit.register_helpers(*%i[clip esource paste search])

Knowing this, you can disable all helpers entirely, use only the ones you care about, or enable all of them at once. The following explains each helper in greater detail.

clip

Use this helper to copy output into the macOS clipboard. Example:

clip (1..3).to_a
# 1
# 2
# 3

clip 1, 2, 3
# 1
# 2
# 3

clip Object.new
# #<Object:0x000000012a46eaf8>

This helper accepts any number of arguments. Each is delimited by a new line for pasting into another application.

esource

Use this helper, short for edit source, to print and edit the source of a constant or method in your default editor. This assumes your have the EDITOR environment variable set and configured to use your favorite editor. If not, you’ll get an error requiring your to update your environment accordingly. Here are a few usage examples:

esource IRB, :start
# Editing: irb-1.13.2/lib/irb.rb:893...

esource IRB, "start"
# Editing: irb-1.13.2/lib/irb.rb:893...

esource "IRB::IRBRC_EXT"
# Editing: irb-1.13.2/lib/irb/init.rb:407...

esource :RUBY_DESCRIPTION
# ERROR (invalid path): ruby.

The first argument is the constant or object you want to search for or target. The second argument is the object’s method you want to find the source code location for. You can also use a symbol or string for the method.

paste

Use this helper to paste the last entry from your macOS clipboard into your console. For example, assuming the text This is a demonstration is in your clipboard, you’d see the following:

paste
# "This is a demonstration"

This helper takes no arguments.

search

Use this helper to search for methods on an object. Example:

search Module, "protected"
# protected_instance_methods
# protected_method_defined?
# protected_methods

search Module, /_defined/
# const_defined?
# class_variable_defined?
# method_defined?
# public_method_defined?
# private_method_defined?
# protected_method_defined?
# instance_variable_defined?

This helper takes two arguments. The first is the object you want to search on and the second argument is the string or regular expression of the methods to search for.

Prompt

A dynamic prompt, based on environment, is provided for you. The code — as shown above — for configuring IRB to make use of this custom prompt is:

IRB.conf[:PROMPT][:DEMO] = {
  PROMPT_I: "[#{IRB::Kit.prompt}]> ",
  PROMPT_N: "[#{IRB::Kit.prompt}]| ",
  PROMPT_C: "[#{IRB::Kit.prompt}]| ",
  PROMPT_S: "[#{IRB::Kit.prompt}]%l ",
  RETURN: "=> %s\n"
}

IRB.conf[:PROMPT_MODE] = :DEMO

You only need to swap out the :DEMO key with a key that identifies you as you see fit.

At the moment, the prompt dynamically detects the following environments:

Additionally, when working with the Hanami and/or Rails frameworks, environment information will be color coded as follows:

  • Non-Production: Displays as green for any environment other than production.

  • Production: Displays as red but only for a production environment.

The following screenshots demonstrate what the prompt looks like in different environments:

Ruby (with Git)

Screenshot

Ruby (without Git)

Screenshot

Hanami (development)

Screenshot

Hanami (production)

Screenshot

Rails

Screenshot

Development

To contribute, run:

git clone https://github.com/bkuhlmann/irb-kit
cd irb-kit
bin/setup

You can also use the IRB console for direct access to all objects:

bin/console

Tests

To test, run:

bin/rake

License

Security

Code of Conduct

Contributions

Developer Certificate of Origin

Versions

Community

Credits