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CONFIGURE.md

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Advanced Tweaking

Welcome Message

The welcome message can be customized with Irbtools.welcome_message=

IRB Prompt

irbtools changes the prompt to :IRBTOOLS mode, which uses >> as the prompt, | for indentation, and > for continuing a statement. You can switch back to the default IRB prompt with:

IRB.conf[:PROMPT_MODE] = :DEFAULT

Customize Libraries to Load

It is possible to modify, which libraries to load:

# Don't require 'irbtools', but:
require 'irbtools/configure'
# Here you can modify the libraries using the methods below
Irbtools.start

If you do not want to load the default set of irbtools gems, you will have to use require 'irbtools/minimal' instead of configure.

You can use the following methods:

  • Irbtools.add_library(lib, options_hash, &block)
  • Irbtools.remove_library(lib)

The options_hash defines the way in which irbtools loads the library. The following options are possible (no options)/:start : The library is required on startup before doing anything else (before displaying the prompt) :thread => identifier : After loading everything else, the library is required in a thread (while continuing loading). You can choose any identifier, but if you take the same one for multiple libraries, they will be loaded in the same thread (in the order that you define) :late => true : The library is required just before showing the prompt. :late_thread => identifier : Same as :thread, but after loading late libraries. :sub_session => true : The library is loaded every time a sub-session starts (using IRB.conf[:IRB_RC]). :autoload => :Constant : Use Ruby's autoload feature. It loads the library as soon as the constant is encountered.

You can pass a block as third argument, which gets executed after the library has completed loading (except for :autoload, in which case the code will be executed directly on startup). You can modify the callbacks by using Irbtools.add_library_callback and Irbtools.replace_library_callback.

When adding a new library, you should firstly consider some way to load it via :autoload. If this is not possible, try loading via :thread. If that is not possible either, you will need to fallback to the default loading mechanism.

Example

Change a FancyIRB setting:

require 'irbtools/configure'

Irbtools.replace_library_callback :fancy_irb do
  FancyIrb.start rocket_mode: false
end

Irbtools.start