Require a lib directory in irb console

Question

Is there a way how to require all files in lib directory at once in irb console?:

irb ( project root )
require './lib/' # not working  

structure

.
|
--lib 
  |
  |-- one.rb
  |-- two.rb
  |-- tree.rb

EDIT

I prefer a solution where I can require files only once, not each time when I start irb session.

Answer 1

Create a file named .irbrc in your home directory, and write require commands for whatever file you want to require in there. When you run irb, .irbrc will be loaded.

Answer 2

As described in the documentation require (and require_relative) can't take the name of a directory as argument, just a single file name. You could write something like the following to do what you want:

Dir['./lib/*.rb'].each { |f| require_relative(f) }

Answer 3

You can use this

Dir[File.dirname(__FILE__) + '/lib/*.rb'].each {|file| require file }