From: James Tucker <jftucker@...>
Date: 2007-12-25T23:01:54+09:00
Subject: Re: Calling Irb from inside an application

Merry christmas!

This was mercilessly stolen and adapted from a post on Errs blog (only  
google has the answer ;):

require 'irb'

module IRB
   def self.start_session(binding)
     IRB.setup(nil)

     workspace = WorkSpace.new(binding)

     if @CONF[:SCRIPT]
       irb = Irb.new(workspace, @CONF[:SCRIPT])
     else
       irb = Irb.new(workspace)
     end

     @CONF[:IRB_RC].call(irb.context) if @CONF[:IRB_RC]
     @CONF[:MAIN_CONTEXT] = irb.context

     trap("SIGINT") do
       irb.signal_handle
     end

     catch(:IRB_EXIT) do
       irb.eval_input
     end
   end
end

def meths(o); puts (o.methods - Class.new.methods).join("\n"); end

def dROP! b
	old_args = ARGV
	ARGV.size.times { ARGV.shift }

	if defined? IRBHelper
		foo = Class.new
		foo.instance_eval do
			include IRBHelper
		end
		puts "Helper Methods: #{(foo.new.methods -  
Class.new.methods).sort.join(', ')}"
		include IRBHelper
	end

	IRB.start_session b
	old_args.each { |a| ARGV << a }
end





On 25 Dec 2007, at 13:26, Stefano Crocco wrote:

> Alle marted́ 25 dicembre 2007, Bertram Scharpf ha scritto:
>> Hi,
>>
>>
>> this may be easy to anwer but it is difficult to google for.
>>
>> While developping I would like to play around with objects from
>> time to time. Just like this:
>>
>>    irb(main):001:0> class C ; def f ; "F" ; end ; end
>>    => nil
>>    irb(main):002:0> irb C.new
>>    irb#1(#<C:0xb7910d40>):001:0> f
>>    => "F"
>>    irb#1(#<C:0xb7910d40>):002:0>
>>
>> In common my classes are not so easy to type in. So, I would like
>> to call Irb from somewhere inside the application as I do here:
>>
>>    ---->-call_irb.rb---------------
>>    #!/usr/bin/ruby
>>
>>    class C
>>      def f
>>        "F"
>>      end
>>    end
>>
>>    if $0 == __FILE__ then
>>      require "irb"
>>      $c = C.new
>>      IRB.start
>>    end
>>    ----<---------------------------
>>
>> and then
>>
>>    user@host $ ./call_irb.rb
>>    irb(main):001:0> irb $c
>>    irb#1(#<C:0xb7be4ee0>):001:0> f
>>    => "F"
>>    irb#1(#<C:0xb7be4ee0>):002:0>
>>
>> Is there a way how I can call C.new's Irb directly without doing
>> the long-winded definition of a global variable first? I already
>> examined the irb sources but this seems to be well-hidden to me.
>>
>> Thanks in advance and Merry Christmas,
>>
>> Bertram
>
> Not a direct answer to your question, but can't you load the file  
> with the
> definition of the class in irb?
>
> Stefano
>